8001511072夏先国安卓大作业报告书
Android 酷儿音乐播放器设计报告书
南昌大学
大作业实验报告 题 目：专 业： 软 件 技 术 班 级： 112 班 学 号： 8001511072 学生姓名：设计人数：起讫日期： 完成时间： 2013-6-7
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Android 酷儿音乐播放器设计报告书
目录
目录 ............................................................................................................................................. - 2 -
一、引 言.................................................................................................................................... - 4 -
1.1 项目背景 ....................................................................................................................... - 4 -
1.2 安卓介绍 ....................................................................................................................... - 5 -
1.3 安卓组件介绍 ............................................................................................................... - 5 -
1.4 安卓XML文件的使用 ................................................................................................ - 6 -
1.5 编写目的 ....................................................................................................................... - 7 -
二、系统功能简介 ...................................................................................................................... - 8 -
2.1 功能需求分析 .............................................................................................................. - 8 -
2.1.1 播放器的基本控制需求 ............................................................................................ - 8 -
2.2 系统性能需求 .............................................................................................................. - 9 -
2.3 运行环境需求 ............................................................................................................ - 10 -
三、程序详细设计 .................................................................................................................... - 11 -
3.1 程序界面设计 ............................................................................................................. - 11 -
i、本地音乐列表界面 ............................................................................................... - 11 - ii、主界面设计 ......................................................................................................... - 12 - iii、播放界面设计 .................................................................................................... - 14 - iV、程序启动界面设计 ............................................................................................ - 17 -
3.2扫描本地音乐文件 ...................................................................................................... - 19 -
3.3 程序ctivity类的设计 ................................................................................................ - 26 -
AllMusicListActivity.java文件代码 .......................................................................... - 27 - MainActivity.java文件代码 ..................................................................................... - 34 - MyMusicListActivity.java文件代码 ........................................................................ - 39 - PlayMusicAcitivity.java文件代码 ............................................................................ - 46 - PlayMusicListActivity.java ........................................................................................ - 55 - PlayService.java ......................................................................................................... - 61 - StartActivity.java ........................................................................................................ - 65 - DataUtils.java ............................................................................................................. - 67 - DBHelper.java ............................................................................................................ - 72 - ImageUtils.java .......................................................................................................... - 73 - LyricView.java ........................................................................................................... - 76 - MusicDemo.java ........................................................................................................ - 79 - MyApplication.java .................................................................................................... - 81 - PlayUtils.java ............................................................................................................. - 83 - SongLyric.java ........................................................................................................... - 88 -
四、程序设计结果及测试分析 ................................................................................................ - 94 -
4.1 程序运行效果图 ......................................................................................................... - 95 -
4.2 程序调试过程 ........................................................................................................... - 104 - - 2 -
Android 酷儿音乐播放器设计报告书
五、实验总结 .......................................................................................................................... - 106 -
六、参考资料 .......................................................................................................................... - 107 -
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Android 酷儿音乐播放器设计报告书
一、引 言
1.1 项目背景
当今社会的生活节奏越来越快，人们对手机的要求也越来越高，由于手机市场发展迅速，使得手机操作系统也出现了不同各类，现在的市场上主要有三四手机操作系统，symbian，ios，Windows mobile，以及谷歌的Android操作系统，其中占有开放源代码优势的Android系统有最大的发展前景。那么能否在手机上拥有自己编写的个性音乐播放器呢？答案是：肯定的，谷歌Android系统就能做到。本文的音乐播放器就是基于谷歌Android手机平台的播放器。
Android：是谷歌于20xx年公布的开放式源代码手机系统，它的开放性就优于其它封闭式的手机系统，因此，任何人都可能根据自己的喜好将手机系统中的所有功能重新编写。这使得越来越多的人关注这个操作系统。本次作品音乐播放器就是基于Android平台的。
随着计算机的广泛运用，手机市场的迅速发展，各种音频视频资源也在网上广为流传，这些资源看似平常，但已经渐渐成为人们生活中必不可少的一部分了。于是各种手机播放器也紧跟着发展起来，但是很多播放器一味追求外观花哨，功能庞大，对用户的手机造成了很多资源浪费，比如CPU，内存等的占用率过高，在用户需要多任务操作时，受到了不小的影响，带来了许多不便，而对于大多数普通用户，许多功能用不上，形同虚设。针对以上各种弊端，选择了开发多语种的音频视频播放器，将各种性能优化，继承播放器的常用功能，满足一般用户（如听歌，看电影）的需求，除了能播放常见格式的语音视频文件，高级功能：还能播放RMVB格式的视频文件。此外，还能支持中文、英文等语言界面。
要研究了各种市场上流行的手机播放器，了解它们各自的插件及编码方式，还有各种播放器播放的特别格式文件，分析各种编码的优缺点以及各种播放器本身存在的缺陷和特点，编写出功能实用，使用方便快捷的播放器。目前已经实现的功能有能播放常见音频文件的功能，如MP3，WAV等，拥有播放菜单，能选择播放清单，具备一般播放器的功能，如上一曲，下一曲等功能。
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Android 酷儿音乐播放器设计报告书
1.2 安卓介绍
Android一词的本义指“机器人”，同时也是Google于20xx年11月5日宣布的基于Linux平台的开源手机操作系统的名称，该平台由操作系统、中间件、用户界面和应用软件组成，号称是首个为移动终端打造的真正开放和完整的移动软件。目前最好的是Android2.0的摩托罗拉Droid
Android是基于Linux内核的软件平台和操作系统，早期由Google开发（在华注册商标名为“安致”），后由开放手机联盟（Open Handset Alliance）开发。它采用了软件堆层（software stack，又名以软件叠层）的架构，主要分为三部分。低层以Linux内核工作为基础，只提供基本功能；其他的应用软件则由各公司自行开发，以Java作为编写程序的一部分。另外，为了推广此技术，Google和其它几十个手机公司建立了开放手机联盟。
1.3 安卓组件介绍
Activity —— 应用表示层（基类Activity）
应用程序中的每个屏幕都是通过继承和扩展基类Activity来实现的。
同一应用中的每个Activity是相互独立的。程序启动后显示的第一幅画面是应用程序的第一个Activity（默认窗口），而后可以根据需要从这个Activity启动另一个新的Activity。
Activity利用View来实现应用中的GUI（用户直接通过GUI和应用程序做交互）。Activity窗口内的可见内容通过基类View提供。使用Activity.setContentView()方法设置当前Activity中的View对象。
Service —— 没有可见的用户界面，但能够长时间运行于后台（基类Service）
运行于应用程序进程的主线程中，因此Service不会阻塞其他组件和用户界面。
Service是不能自己启动的，必须通过Context对象（如一个Activity）调用startService或bindService方法来启动（用这两种方法启动的Service的生命周期不同）。
Broadcast Receiver —— 用户接收广播通知的组件（基类BroadcastReceiver）
Android中的广播要么来自于系统，要么来自普通应用程序。
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Android 酷儿音乐播放器设计报告书
很多事件都可能导致系统广播，如手机所在时区发生变化，电池电量低，用户改变系统语言设置等。
来自普通应用程序，如一个应用程序通知其他应用程序某些数据已经下载完毕。
Content Provider —— 为解决应用程序间数据通信、共享的问题（基类ContentProvider）
在Android中，每个应用程序都是用自己的用户ID并在自己的进程中运行。这样的好处是，可以有效地保护系统及应用程序，避免被其他不正常德应用程序所影响，每个进程都拥有独立的进程地址空间和虚拟空间。
Content Provider可以将应用程序特定的数据提供给另一个应用程序使用。其数据存储方式可以是Android文件系统、SQLite数据库或者其他合理的方式。
当数据需要在应用程序间共享时，我们就可以利用ContentProvider为数据定义一个URI。之后，其他应用程序对数据进行查询或者修改时，只需要从当前上下文对象获得一个ContentResolver, 然后传入响应的URI就可以了。
Intent —— 连接组件的纽带
以上4种基本组件中，除了Content Provider是通过Content Resolver激活外，其他3种组件Activity、Service和Broadcast Receiver都是由Intent异步消息激活的。
Intent在不同的组件之间传递消息，将一个组件的请求意图传给另一个组件。因此，Intent是包含具体请求信息的对象。
Intent是一种运行时绑定（runtime binding）机制，它能够在程序运行的过程中连接两个不同的组件。通过Intent，你的程序可以向Android表到某种请求或者意愿，Android会根据意愿的内容选择适当的组件来处理请求。
1.4 安卓XML文件的使用
在安卓工程中，大量使用了XML文件，比如界面布局文件，字符资源文件，风格style文件，简单图形文件等。
比如在界面布局文件中，通过指定控件的排列方式、间隔像素、对齐方式等，达到对页面进行布局的目的，同时使用特定编辑器，实时解析布局文件，到达所见即所得的目的。
在字符资源中，通过关键字编辑字符内容，这样可以在不修改代码的情况下，修改程序内容。同时，考虑多国语言的使用，更加容易替换字符内容，所以我们建议在代码的编写过程中，尽量少地在程序中使用特定语言字符，而是在字符资源文件中编写。
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Android 酷儿音乐播放器设计报告书
在风格文件中，通过特定关键字，可以使界面呈现统一风格，同时减少重复代码的编写，减轻工作量。图形XML文件中可以实现一些矩形、椭圆形等图形文件，可以指定颜色和渐变颜色范围。
1.5 编写目的
现今社会生活紧张，而欣赏音乐是其中最好的舒缓压力的方式之一，本项目的目的是开发一个可以播放主流音乐文件格式的播放器，本设计的实现的这主要功能是播放mp3、wav多种格式的音乐文件，并且能够控制播放，暂停，停止，上一曲，下一曲，显示歌词，视觉外观，播放列表和歌曲文件的管理操作等多种播放控制功能，界面简明，操作简单。
本项目是一款基于Android手机平台的音乐播放器，使Android手机拥有个性的多媒体播放器，使手机显得更生动灵活化，与人们更为接近，让手机主人随时随地处于音乐视频的旋律之中。使人们的生活更加多样化。也使设计者更加熟练Android的技术和其它在市场上的特点。
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Android 酷儿音乐播放器设计报告书
二、系统功能简介
2.1 功能需求分析
根据项目的目标，可获得项目系统的基本需求，以下从不同角度来描述系统的需求，并且使用用例图来描述，系统的功能需求，分成四部分来概括，即播放器的基本控制需要，播放列表管理需求，播放器友好性需求和播放器扩展卡需求。
2.1.1 播放器的基本控制需求
下面图2-1是音乐播放器的基本用例图，描述了程序的基本功能。
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Android 酷儿音乐播放器设计报告书
图2-1-1播放器基本用例图
2.2 系统性能需求
根据Android手机系统要求无响应时间为5秒，所以就有如下性能要求：
（1）当要求歌曲播放时，程序响应时间最长不能超过5秒
（2）当要求歌曲暂停时，程序响应时间最长不能超过5秒
（3）当要求歌曲停止时，程序响应时间最长不能超过5秒
（4）当要求歌曲上/下一首时，程序响应时间最长不能超过5秒
（5）当要求进行清单列表时，程序响应时间最长不能超过5秒 - 9 -
Android 酷儿音乐播放器设计报告书
2.3 运行环境需求
操作系统：Android手机基于Linux操作系统 支持环境：Android 2.2及其以上版本 开发环境：Eclipse及ADT插件
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Android 酷儿音乐播放器设计报告书
三、程序详细设计
3.1 程序界面设计
i、本地音乐列表界面
设计如下3-1图所示
图3-1本地音乐列表界面
本地音乐列表界面采用LinearLayout线性布局设计，首先是占据整个屏幕的高度和宽度，设置背景颜色，然后再在这里面定义ListView列表，设置每一个列表的高度宽度，颜色，默认值等。具体代码如下
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="/apk/res/android"
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Android 酷儿音乐播放器设计报告书
android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#00000000" android:orientation="vertical" >
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent" android:layout_height="504dp" android:background="#00000000" android:divider="@drawable/divider" android:dividerHeight="1dp"
android:drawSelectorOnTop="false" android:footerDividersEnabled="false" android:headerDividersEnabled="false" android:scrollingCache="false" > </ListView>
</LinearLayout>
ii、主界面设计
如下3-2图所示
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Android 酷儿音乐播放器设计报告书
图3-2主界面
主界面采用RelativeLayout相对布局器设计，设置背景图片，音乐列表相对位置主界面采用相对布局管理器代码如下
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="/apk/es/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg_blue" >
<RelativeLayout
android:id="@+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="538dp"
android:background="#00000000"
android:orientation="vertical" >
<TabWidget
android:id="@android:id/tabs"
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Android 酷儿音乐播放器设计报告书
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/LinearLayout1" > </TabWidget>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="fill_parent“
android:layout_height="fill_parent"
android:layout_below="@android:id/tabs"
android:layout_marginBottom="55dp"
android:background="#00000000" />
<LinearLayout
android:id="@+id/footer"
android:layout_width="fill_parent"
android:layout_height="55dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:background="@drawable/footer"
android:orientation="horizontal" >
<TextView
android:id="@+id/text_footet_playingMusic" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:background="@drawable/footertext_select" android:padding="10dp“
android:text="@string/text_footerText"
android:textColor="@color/textColor" />
</LinearLayout>
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/footer" />
</RelativeLayout>
</TabHost>
iii、播放界面设计
如下图3-3所示
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Android 酷儿音乐播放器设计报告书
图3-3播放界面
播放界面采用相对布局管理器，首先设置背景图片，管理器占据整个屏幕。然后采用线性布局管理器嵌套LinearLayout，定义图片按钮button，定义文本显示组件，textview用来显示歌曲名称和歌词，这里如果系统中没有歌词，那么将显示默认的系统图片。另外这里涉及SeekBar的用法。在播放音乐或者视频的时候，都会有一个播放的即时进度条，显示当前多媒体的播放进度，同时，我们可以拖动这个进度条，超前播放或者延后播放，这个控件就是拖动条。在Android中我们使用SeekBar来实现进度拖动效果。具体布局设计见下面代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="/apk/res/android" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg_blue" >
<ImageView
android:id="@+id/image_pic"
android:layout_width="200dp"
android:layout_height="150dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
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Android 酷儿音乐播放器设计报告书
android:layout_marginTop="10dp"
android:background="#33AAAAAA"
android:contentDescription="@string/app_name" android:paddingBottom="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="8dp"
android:src="@drawable/pic" />
<TextView
android:id="@+id/text_musicName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@id/image_pic"
android:layout_centerHorizontal="true"
android:gravity="center"
android:text="@string/text_musicName"
android:textColor="@color/textColor"
android:textSize="16sp" />
<LinearLayout
android:id="@+id/layout_down"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:background="@drawable/footer"
android:gravity="center"
android:orientation="horizontal"
android:padding="5dp" >
<Button
android:id="@+id/button_last"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:background="@drawable/last_select"
android:contentDescription="@string/app_name" /> <Button
android:id="@+id/button_play"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:background="@drawable/play_select" - 16 -
Android 酷儿音乐播放器设计报告书
android:contentDescription="@string/app_name" /> <Button
android:id="@+id/button_next"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginLeft="12dp"
android:layout_marginRight="12dp"
android:background="@drawable/next_select"
android:contentDescription="@string/app_name" /> </LinearLayout>
<LinearLayout
android:id="@+id/seekBar_layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@id/layout_down" >
<SeekBar
android:id="@+id/seekBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:maxHeight="4dp"
android:minHeight="3dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:progressDrawable="@drawable/seekbarcolors" android:thumb="@drawable/cursor"
android:thumbOffset="0dp" />
</LinearLayout>
<LinearLayout
android:id="@+id/lrc_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@id/text_musicName"
android:layout_marginBottom="95dp"
android:background="#33AAAAAA" >
</LinearLayout>
</RelativeLayout>
iV、程序启动界面设计
如下图3-4
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Android 酷儿音乐播放器设计报告书
图3-4程序启动界面
采用线性布局管理器LinearLayout后设置背景图片，定义TextView显示程序名称即‘酷儿音乐’以及文本显示属性大小颜色等，同时定义组件ProgressBar表示程序的运行进度 界面详细代码如下
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="/apk/res/android" android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg_start"
android:orientation="vertical" >
<TextView
android:id="@+id/text_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
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Android 酷儿音乐播放器设计报告书
android:layout_marginTop="30dp"
android:layout_marginBottom="10dp"
android:text=
android:textSize="25sp"
android:textColor="@color/textColor" />
<ProgressBar
style="@android:style/Widget.ProgressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal" />
</LinearLayout>
3.2扫描本地音乐文件
程序会对本地音乐文件夹进行扫描过滤，提取出mp3的文件以供播放，文件过滤类的内容如下：
package com.huazi.Mp3Player.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.provider.MediaStore;
import com.huazi.Mp3Player.MainActivity;
import com.huazi.Mp3Player.StartActivity;
public class DataUtils {
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Android 酷儿音乐播放器设计报告书
public static void update_AllMusicData(ContentResolver resolver,Context context) { musicList.clear(); Cursor cursor
null, null, = null, private static List<MusicDemo> musicList = new ArrayList<MusicDemo>(); resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
while (cursor.moveToNext()) { // 歌曲的名称 String name = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));
// 歌曲的歌手名 String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
// 歌曲文件的路径 String path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
{
} musicList.add(new MusicDemo(name, path, artist)); DBHelper dbHelper = new DBHelper(context, "myData"); SQLiteDatabase db = dbHelper.getWritableDatabase(); db.execSQL("delete from all_music"); if (!musicList.isEmpty()) { for (Iterator<MusicDemo> iterator = musicList.iterator(); iterator.hasNext();) MusicDemo demo = (MusicDemo) iterator.next(); ContentValues values = new ContentValues(); values.put("name", demo.getName()); values.put("path", demo.getPath()); values.put("artist", demo.getArtist()); db.insert("all_music", null, values); - 20 -
Android 酷儿音乐播放器设计报告书
}
}
db.close();
}
public static void get_AllMusicListFD(Context context) {
if (!MyApplication.getAllMusicList().isEmpty()) {
MyApplication.getAllMusicList().clear();
}
DBHelper dbHelper = new DBHelper(context, "myData");
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("select name,path,artist from all_music", null); while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name);
map.put("path", path);
map.put("artist", artist);
MyApplication.getAllMusicList().add(map);
}
cursor.close();
db.close();
}
public static void get_PlayMusicListFD() {
if (!MyApplication.getPlayMusicList().isEmpty()) {
MyApplication.getPlayMusicList().clear();
}
DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase();
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Android 酷儿音乐播放器设计报告书
null);
} Cursor cursor = db.rawQuery("Select name,path,artist from play_music", null); while (cursor.moveToNext()) { } db.close(); String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getPlayMusicList().add(map); System.out.println(name + path + artist); public static void get_HappyMusicListFD() { if (!MyApplication.getHappyMusicList().isEmpty()) { } DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery("Select name,path,artist from my_happy_music", MyApplication.getHappyMusicList().clear(); while (cursor.moveToNext()) { String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getHappyMusicList().add(map); - 22 -
Android 酷儿音乐播放器设计报告书
null);
} } db.close(); public static void get_QuietMusicListFD() { if (!MyApplication.getQuietMusicList().isEmpty()) { } DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery("Select name,path,artist from my_quiet_music", MyApplication.getQuietMusicList().clear(); } while (cursor.moveToNext()) { } db.close(); String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getQuietMusicList().add(map); public static void get_SadMusicListFD() { if (!MyApplication.getSadMusicList().isEmpty()) { } DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery("Select name,path,artist from my_sad_music", null); - 23 - MyApplication.getSadMusicList().clear();
Android 酷儿音乐播放器设计报告书
} while (cursor.moveToNext()) { } db.close(); String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getSadMusicList().add(map); public static void get_AllListsFD() { } get_AllMusicListFD(StartActivity.context); get_HappyMusicListFD(); get_PlayMusicListFD(); get_QuietMusicListFD(); get_SadMusicListFD(); public static void upData_Lists(Context context,String table_name) { List<HashMap<String, Object>> musicList = new ArrayList<HashMap<String, Object>>();
if (table_name.equals("play_music")) { } else if (table_name.equals("my_happy_music")) { } else if (table_name.equals("my_quiet_music")) { musicList = MyApplication.getQuietMusicList(); - 24 - musicList = MyApplication.getPlayMusicList(); musicList = MyApplication.getHappyMusicList();
Android 酷儿音乐播放器设计报告书
} else if (table_name.equals("my_sad_music")) { } else{ } SQLiteDatabase db = new DBHelper(context, "myData").getWritableDatabase(); db.execSQL("delete from " + table_name); db.execSQL("update sqlite_sequence SET seq = 0 where name = '"+ System.out.println("table name error!"); musicList = MyApplication.getSadMusicList(); table_name+"'");
for (Iterator<HashMap<String, Object>> iterator = musicList.iterator(); iterator.hasNext();) {
HashMap<String, Object> hashMap = (HashMap<String, Object>) iterator.next();
} public static void upData_allLists() { } upData_Lists(MainActivity.context,"play_music"); upData_Lists(MainActivity.context,"my_happy_music"); upData_Lists(MainActivity.context,"my_quiet_music"); upData_Lists(MainActivity.context,"my_sad_music"); } } db.close(); ContentValues values = new ContentValues(); values.put("name", (String) hashMap.get("name")); values.put("path", (String) hashMap.get("path")); values.put("artist", (String) hashMap.get("artist")); db.insert(table_name, null, values);
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Android 酷儿音乐播放器设计报告书
3.3 程序ctivity类的设计
程序的界面MusicTestActivity类是程序的主要部分，设计到界面所有控件的操作及设计、程序的流程控制及音乐播放的核心部分。类的大纲如下图3-7所示。
图3-7
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Android 酷儿音乐播放器设计报告书
Activity类文件具体如下
AllMusicListActivity.java文件代码 package com.huazi.Mp3Player;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.huazi.Mp3Player.Utils.DataUtils;
import com.huazi.Mp3Player.Utils.MyApplication; import com.huazi.Mp3Player.Utils.PlayUtils;
public class AllMusicListActivity extends ListActivity {
private ListView listView;
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Android 酷儿音乐播放器设计报告书
private static MyListAdapter listAdapter;
public static Context context;
private ContentResolver resolver;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.allmusic_list_layout);
getWindow().setBackgroundDrawable(null);
listView = (ListView) findViewById(android.R.id.list);
context = this;
resolver = getContentResolver();
listAdapter = new MyListAdapter(this, MyApplication.getAllMusicList());
listView.setAdapter(listAdapter);
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
HashMap<String, Object> map = MyApplication.getAllMusicList().get(position);
if (map.get("name").equals(PlayService.name) && MyApplication.playStatus == 1) {
Toast.makeText(context, "正在播放...", 0).show();
}else {
boolean b = PlayUtils.addMusicToList(context, map, MyApplication.getPlayMusicList());
if (b) {
PlayMusicListActivity.myListAdapter.notifyDataSetChanged(); PlayUtils.turnToPlay(map, context);
}
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "播放全部音乐");
menu.add(0, 1, 1, "更新本地乐库");
return super.onCreateOptionsMenu(menu);
}
@Override
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Android 酷儿音乐播放器设计报告书
//
public boolean onOptionsItemSelected(MenuItem item) { } switch (item.getItemId()) { case 0: PlayUtils.turnToPlay_List(context, MyApplication.getAllMusicList()); break; case 1: new AllMusic_List_asyncTask(listAdapter).execute(); break; default: break; } return super.onOptionsItemSelected(item); public boolean onKeyDown(int keyCode, android.view.KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { backDialog(); } return false; }; public void backDialog() { AlertDialog.Builder builder = new Builder(this); builder.setMessage("确认退出吗？"); builder.setTitle("提示"); builder.setPositiveButton("确认", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); ((Activity) context).finish(); new AsyncTask<Void, Void, Void>(){ @Override protected Void doInBackground(Void... params) { if (MyApplication.playStatus != 0) { PlayService.stop(); PlayService.player.release(); } DataUtils.upData_allLists(); return null; } }.execute(); - 29 -
Android 酷儿音乐播放器设计报告书
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.create().show();
}
public class MyListAdapter extends BaseAdapter {
private class buttonViewHolder {
TextView musicName;
ImageButton add;
ImageButton collect;
}
private ArrayList<HashMap<String, Object>> musicList;
private LayoutInflater mInflater;
private Context mContext;
private buttonViewHolder holder;
public MyListAdapter(Context context, List<HashMap<String, Object>> appList) { musicList = (ArrayList<HashMap<String, Object>>) appList;
mContext = context;
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public int getCount() {
return musicList.size();
}
public Object getItem(int position) {
return musicList.get(position);
}
public long getItemId(int position) {
return position;
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Android 酷儿音乐播放器设计报告书
}
public void removeItem(int position) {
musicList.remove(position);
this.notifyDataSetChanged();
}
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView != null) {
holder = (buttonViewHolder) convertView.getTag();
} else {
convertView = mInflater.inflate(R.layout.allmusic_list_item_layout, null); holder = new buttonViewHolder();
holder.musicName = (TextView) convertView.findViewById(R.id.text_musicName);
holder.add = (ImageButton) convertView.findViewById(R.id.button_add);
holder.collect = (ImageButton) convertView.findViewById(R.id.button_collect);
convertView.setTag(holder);
}
HashMap<String, Object> itemInfo = musicList.get(position);
if (itemInfo != null) {
String aname = (String) itemInfo.get("name");
holder.musicName.setText(aname);
holder.add.setOnClickListener(new addOnClickListener(position));
holder.collect.setOnClickListener(new collectOnClickListener(position)); }
return convertView;
}
class collectOnClickListener implements OnClickListener {
int position;
public collectOnClickListener(int position) {
this.position = position;
}
public void onClick(View v) {
Builder builder = new AlertDialog.Builder(context);
builder.setIcon(R.drawable.collect);
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Android 酷儿音乐播放器设计报告书
builder.setTitle(" 请选择收藏列表");
builder.setItems(new String[] { "轻音乐", "华语", "热歌" }, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
HashMap<String, Object> map = MyApplication.getAllMusicList().get(position);
boolean b;
switch (which) {
case 0:
b = PlayUtils.addMusicToList(context,map, MyApplication.getHappyMusicList());
break;
case 1:
b = PlayUtils.addMusicToList(context, map, MyApplication.getQuietMusicList());
break;
case 2:
b = PlayUtils.addMusicToList(context, map, MyApplication.getSadMusicList());
break;
default:
b = false;
break;
}
if (b) MyMusicListActivity.listAdapter.notifyDataSetChanged(); }
});
builder.create().show();
}
}
class addOnClickListener implements OnClickListener {
private int position;
public addOnClickListener(int position) {
this.position = position;
}
public void onClick(View v) {
HashMap<String, Object> map = - 32 -
Android 酷儿音乐播放器设计报告书
MyApplication.getAllMusicList().get(position);
boolean b = PlayUtils.addMusicToList(context, MyApplication.getPlayMusicList());
if (b) PlayMusicListActivity.myListAdapter.notifyDataSetChanged(); }
}
}
public class AllMusic_List_asyncTask extends AsyncTask<String, Void, Void> {
private ProgressDialog progressDialog;
private MyListAdapter listAdapter;
public AllMusic_List_asyncTask(MyListAdapter listAdapter) {
this.listAdapter = listAdapter;
progressDialog = new ProgressDialog(context);
}
@Override
protected void onPreExecute() {
progressDialog.setMessage("扫描所有音乐...");
progressDialog.setCancelable(false);
progressDialog.setIndeterminate(false);
progressDialog.show();
super.onPreExecute();
}
@Override
protected Void doInBackground(String... params) {
DataUtils.update_AllMusicData(resolver,context);
DataUtils.get_AllMusicListFD(context);
return null;
}
@Override
protected void onProgressUpdate(Void... values) {
}
@Override
protected void onPostExecute(Void result) {
listAdapter.notifyDataSetChanged();
progressDialog.dismiss();
map, - 33 -
Android 酷儿音乐播放器设计报告书
}
}
}
MainActivity.java文件代码
package com.huazi.Mp3Player;
import java.util.ArrayList;
import android.app.LocalActivityManager;
import android.app.TabActivity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TextView;
import com.huazi.Mp3Player.Utils.MyApplication;
public class MainActivity extends TabActivity {
public static Context context;
private LocalActivityManager manager;
private TabHost tabHost;
private ViewPager viewPager;
public static TextView footer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.main);
context = MainActivity.this;
footer = (TextView) findViewById(R.id.text_footet_playingMusic);
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Android 酷儿音乐播放器设计报告书
manager = new LocalActivityManager(this, true);
manager.dispatchCreate(savedInstanceState);
this.loadTabHost();
this.loadViewPager();
tabHost.setCurrentTab(2);
footer.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
MainActivity.context.startActivity(new Intent(MainActivity.this, PlayMusicAcitivity.class));
}
});
}
@Override
protected void onResume() {
if (MyApplication.playStatus != 0) {
footer.setText(PlayService.name);
}
super.onResume();
}
public View getView(String id, Intent intent) {
return manager.startActivity(id, intent).getDecorView();
}
public void loadTabHost() {
tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("myMusic").setIndicator("我的音乐", getResources().getDrawable(R.drawable.xin_big)).setContent(new Intent(context, MyMusicListActivity.class)));
tabHost.addTab(tabHost.newTabSpec("allMusic").setIndicator("所有歌曲", getResources().getDrawable(R.drawable.all_tab)).setContent(new Intent(context, AllMusicListActivity.class)));
tabHost.addTab(tabHost.newTabSpec("playingMusic").setIndicator("播放列表", getResources().getDrawable(R.drawable.play_tab)).setContent(new Intent(context, PlayMusicListActivity.class)));
tabHost.setOnTabChangedListener(new OnTabChangeListener() {
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Android 酷儿音乐播放器设计报告书
} }); public void onTabChanged(String tabId) { if (tabId.equals("myMusic")) { viewPager.setCurrentItem(0); } if (tabId.equals("allMusic")) { viewPager.setCurrentItem(1); } if (tabId.equals("playingMusic")) { viewPager.setCurrentItem(2); } } public void loadViewPager() { viewPager = (ViewPager) findViewById(R.id.viewPager); final ArrayList<View> list = new ArrayList<View>(); list.add(getView("myMusic", new Intent(context, MyMusicListActivity.class))); list.add(getView("allMusic", new Intent(context, AllMusicListActivity.class))); list.add(getView("playingMusic", new Intent(context, PlayMusicListActivity.class))); viewPager.setAdapter(new PagerAdapter() { @Override public void destroyItem(View arg0, int arg1, Object arg2) { viewPager.removeView(list.get(arg1)); } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(list.get(arg1)); return list.get(arg1); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == arg1; } @Override public int getCount() { return list.size(); - 36 -
Android 酷儿音乐播放器设计报告书
}
@Override
public void finishUpdate(View arg0) {
// TODO Auto-generated method stub
}
@Override
public void restoreState(Parcelable arg0, ClassLoader arg1) { // TODO Auto-generated method stub
}
@Override
public Parcelable saveState() {
// TODO Auto-generated method stub
return null;
}
@Override
public void startUpdate(View arg0) {
// TODO Auto-generated method stub
}
});
viewPager.setOnPageChangeListener(new OnPageChangeListener() {
public void onPageSelected(int arg0) {
tabHost.setCurrentTab(arg0);
}
public void onPageScrolled(int arg0, float arg1, int arg2) { }
public void onPageScrollStateChanged(int arg0) {
}
});
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Android 酷儿音乐播放器设计报告书
} }
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Android 酷儿音乐播放器设计报告书
MyMusicListActivity.java文件代码 package com.huazi.Mp3Player;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import com.huazi.Mp3Player.Utils.DataUtils;
import com.huazi.Mp3Player.Utils.MyApplication;
import com.huazi.Mp3Player.Utils.PlayUtils;
public class MyMusicListActivity extends ExpandableListActivity {
private ExpandableListView myMusicListView;
private ArrayList<HashMap<String, Object>> groupsList; private List<List<HashMap<String, Object>>> childsList; public static MyMusicListAdapter listAdapter;
private static Context context;
@Override
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
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Android 酷儿音乐播放器设计报告书
setContentView(R.layout.mymusic_list_layout);
myMusicListView = getExpandableListView();
context = this;
groupsList = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> group1 = new HashMap<String, Object>();
group1.put("name", "轻音乐");
HashMap<String, Object> group2 = new HashMap<String, Object>();
group2.put("name", "华语");
HashMap<String, Object> group3 = new HashMap<String, Object>();
group3.put("name", "热歌");
groupsList.add(group1);
groupsList.add(group2);
groupsList.add(group3);
childsList = new ArrayList<List<HashMap<String, Object>>>();
childsList.add(MyApplication.getHappyMusicList());
childsList.add(MyApplication.getQuietMusicList());
childsList.add(MyApplication.getSadMusicList());
listAdapter = new MyMusicListAdapter(this, groupsList, childsList);
myMusicListView.setAdapter(listAdapter);
}
public static Context getContext(){
return context;
}
@Override
public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
HashMap<String, Object> map = childsList.get(groupPosition).get(childPosition); if (map.get("name").equals(PlayService.name) && MyApplication.playStatus == 1) { Toast.makeText(context, "正在播放...", 0).show();
}else {
boolean b = PlayUtils.addMusicToList(context, map, MyApplication.getPlayMusicList());
if (b) {
PlayMusicListActivity.myListAdapter.notifyDataSetChanged();
PlayUtils.turnToPlay(map, context);
}
}
return super.onChildClick(parent, v, groupPosition, childPosition, id);
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Android 酷儿音乐播放器设计报告书
} public boolean onKeyDown(int keyCode, android.view.KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { backDialog();
}
return false;
};
@Override
protected void onDestroy() {
DataUtils.upData_allLists();
super.onDestroy();
}
public void backDialog() {
AlertDialog.Builder builder = new Builder(this);
builder.setMessage("确认退出吗？");
builder.setTitle("提示");
builder.setPositiveButton("确认", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
((Activity) context).finish();
new AsyncTask<Void, Void, Void>(){
@Override
protected Void doInBackground(Void... params) {
if (MyApplication.playStatus != 0) {
PlayService.stop();
// PlayService.player.release();
}
DataUtils.upData_allLists();
return null;
}
}.execute();
}
});
builder.setNegativeButton("取消", new OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
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Android 酷儿音乐播放器设计报告书
dialog.dismiss();
}
});
builder.create().show();
}
class MyMusicListAdapter extends BaseExpandableListAdapter {
private Context context;
private List<HashMap<String, Object>> groups;
private List<List<HashMap<String, Object>>> childs;
private childViewsHolder childHolder;
private GroupViewsHolder groupHolder;
public MyMusicListAdapter(Context context, List<HashMap<String, Object>> groups, List<List<HashMap<String, Object>>> childs) {
this.context = context;
this.groups = groups;
this.childs = childs;
}
private class childViewsHolder {
TextView childText;
ImageButton childButton;
}
public Object getChild(int arg0, int arg1) {
return childs.get(arg0).get(arg1);
}
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
public void removeChildItem(int groupPosition, int childPosition) {
childs.get(groupPosition).remove(childPosition);
this.notifyDataSetChanged();
}
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
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Android 酷儿音乐播放器设计报告书
if (convertView != null) {
childHolder = (childViewsHolder) convertView.getTag();
} else {
childHolder = new childViewsHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.mymusic_childs_layout, null);
childHolder.childText = (TextView) convertView.findViewById(R.id.text_childItem);
childHolder.childButton = (ImageButton) convertView.findViewById(R.id.button_deleteChildItem);
convertView.setTag(childHolder);
}
HashMap<String, Object> childItem = childs.get(groupPosition).get(childPosition);
if (childItem != null) {
String name = (String) childItem.get("name");
childHolder.childText.setText(name);
childHolder.childButton.setOnClickListener(new
childItemOnClick(groupPosition, childPosition));
}
return convertView;
}
public class childItemOnClick implements android.view.View.OnClickListener {
private int groupPosition;
private int childPosition;
public childItemOnClick(int groupPosition, int childposition) {
this.groupPosition = groupPosition;
this.childPosition = childposition;
}
public void onClick(View v) {
removeChildItem(groupPosition, childPosition);
}
}
public int getChildrenCount(int groupPosition) {
- 43 -
Android 酷儿音乐播放器设计报告书
return childs.get(groupPosition).size();
}
public Object getGroup(int groupPosition) {
return groups.get(groupPosition);
}
public int getGroupCount() {
return groups.size();
}
public long getGroupId(int groupPosition) {
return groupPosition;
}
private class GroupViewsHolder {
TextView groupText;
ImageButton groupButton;
}
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
if (convertView != null) {
groupHolder = (GroupViewsHolder) convertView.getTag();
} else {
groupHolder = new GroupViewsHolder();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.mymusic_groups_layout, null);
groupHolder.groupText = (TextView) convertView.findViewById(R.id.text_groupItem);
groupHolder.groupButton = (ImageButton) convertView.findViewById(R.id.button_playAll);
convertView.setTag(groupHolder);
}
HashMap<String, Object> map = groups.get(groupPosition);
if (map != null) {
String name = (String) map.get("name");
- 44 -
Android 酷儿音乐播放器设计报告书
groupHolder.groupText.setText(name);
groupHolder.groupButton.setOnClickListener(new
GroupOnClick(groupPosition));
}
return convertView;
}
class GroupOnClick implements View.OnClickListener {
private int position;
public GroupOnClick(int position) {
this.position = position;
}
public void onClick(View v) {
switch (position) {
case 0:
PlayUtils.turnToPlay_List(context,
MyApplication.getHappyMusicList());
break;
case 1:
PlayUtils.turnToPlay_List(context, MyApplication.getQuietMusicList()); break;
case 2:
PlayUtils.turnToPlay_List(context, MyApplication.getSadMusicList()); break;
default:
break;
}
}
}
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
public boolean isChildSelectable(int groupPosition, int childPosition) {
// TODO Auto-generated method stub
- 45 -
Android 酷儿音乐播放器设计报告书
return true;
}
}
}
PlayMusicAcitivity.java文件代码 package com.huazi.Mp3Player;
import java.io.File;
import java.io.InputStream;
import java.util.HashMap;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView;
import android.widget.Toast;
import com.huazi.Mp3Player.Utils.LyricView;
import com.huazi.Mp3Player.Utils.MyApplication; - 46 -
Android 酷儿音乐播放器设计报告书
import com.huazi.Mp3Player.Utils.PlayUtils;
import com.huazi.Mp3Player.Utils.SongLyric;
public class PlayMusicAcitivity extends Activity {
static TextView musicTextView;
private Button lastButton;
public static Button playButton;
private Button nextButton;
static Context context;
public static SeekBar seekBar;
static ImageView musicImage;
static String name;
static String path;
static String artist;
static Handler handler;
public static Runnable runnable;
static boolean isChangeSeekbarP;
ContentResolver resolver;
static String SDRoot = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator;
private static SongLyric lrc;
private static LyricView lrcView;
private static long time = 0;
private static LinearLayout lrcLayout;
private static String lrcPath;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.playmusic_layout);
context = this;
resolver = getContentResolver();
musicTextView = (TextView) findViewById(R.id.text_musicName);
lastButton = (Button) findViewById(R.id.button_last);
playButton = (Button) findViewById(R.id.button_play);
nextButton = (Button) findViewById(R.id.button_next);
seekBar = (SeekBar) findViewById(R.id.seekBar);
- 47 -
Android 酷儿音乐播放器设计报告书
musicImage = (ImageView) findViewById(R.id.image_pic);
lrcLayout = (LinearLayout) findViewById(R.id.lrc_layout);
lrcView = new LyricView(lrcLayout.getContext());
lrcLayout.addView(lrcView);
lastButton.setOnClickListener(new ButtonListener());
playButton.setOnClickListener(new ButtonListener());
nextButton.setOnClickListener(new ButtonListener());
seekBar.setOnSeekBarChangeListener(new onSeekBarListener());
handler = new Handler();
runnable = new Runnable() {
public void run() {
System.out.println(PlayService.player.getCurrentPosition()); if (MyApplication.playStatus == 1) {
seekBar.setMax(PlayService.player.getDuration());
seekBar.setProgress(PlayService.player.getCurrentPosition()); if (new File(lrcPath).exists()) {
lrc = new SongLyric(lrcPath);
lrc.setMaxTime(PlayService.player.getDuration()); lrcView.setLyric(lrc);
time = PlayService.player.getCurrentPosition(); lrcView.setTime(time);
lrcView.postInvalidate();
setTitle(SongLyric.longToString((int) time) + SongLyric.longToString((int) lrc.getMaxTime()));
}
}
if (!name.equals(PlayService.name)) {
name = PlayService.name;
path = PlayService.path;
artist = PlayService.artist;
musicTextView.setText(name);
musicImage.setImageResource(R.drawable.pic);
new imageTask().execute();
lrcPath = path.substring(0, path.length()-4) + ".lrc"; }
handler.postDelayed(this, 50);
}
};
if (MyApplication.getPlayMusicList().isEmpty()) {
"/" + - 48 -
Android 酷儿音乐播放器设计报告书
} name = null; path = null; } else { if (MyApplication.playStatus != 0) { name = PlayService.name; path = PlayService.path; artist = PlayService.artist; System.out.println(path); lrcPath = path.substring(0, path.length()-4) + ".lrc"; System.out.println(lrcPath); musicTextView.setText(name); new imageTask().execute(); if (MyApplication.playStatus == 1) { handler.post(runnable); playButton.setBackgroundResource(R.drawable.pause_select); } if (MyApplication.playStatus == 2) { playButton.setBackgroundResource(R.drawable.play_select); } for (int i = 0; i < MyApplication.getPlayMusicList().size(); i++) { if (name.equals(MyApplication.getPlayMusicList().get(i).get("name"))) { MyApplication.musicPosition = i; break; } } } else { HashMap<String, Object> map = MyApplication.getPlayMusicList().get(0); name = (String) map.get("name"); path = (String) map.get("path"); artist = (String) map.get("artist"); lrcPath = path.substring(0, path.length()-4) + ".lrc"; } } public static class imageTask extends AsyncTask<Object, Object, Object> { @Override protected Object doInBackground(Object... params) { File file = new File(SDRoot + "Mp3Player" + File.separator + artist + ".jpg"); System.out.println(file); - 49 -
Android 酷儿音乐播放器设计报告书
if (!file.exists()) {
System.out.println("-------->下载图片！！！<----------");
InputStream inputStream = PlayUtils.getInputstreamByKeyWord(artist); PlayUtils.write2SDFromInput("Mp3Player", artist + ".jpg", inputStream); }
return null;
}
@Override
protected void onPostExecute(Object result) {
Bitmap image = BitmapFactory.decodeFile(SDRoot + "Mp3Player" + File.separator + artist + ".jpg", null);
musicImage.setImageBitmap(image);
super.onPostExecute(result);
}
}
@Override
protected void onResume() {
if (MyApplication.playStatus == 1) {
handler.post(runnable);
}
super.onResume();
}
@Override
protected void onStop() {
handler.removeCallbacks(runnable);
super.onStop();
}
@Override
protected void onDestroy() {
handler.removeCallbacks(runnable);
super.onDestroy();
}
public static void getMusicInfo(int position) {
HashMap<String, Object> map = MyApplication.getPlayMusicList().get(position); name = (String) map.get("name");
path = (String) map.get("path");
artist = (String) map.get("artist");
lrcPath = path.substring(0, path.length()-4) + ".lrc";
- 50 -
Android 酷儿音乐播放器设计报告书
System.out.println("------------lrcPath>" + lrcPath);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, "停止");
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch (item.getItemId()) {
case 0:
PlayService.stop();
handler.removeCallbacks(runnable);
seekBar.setProgress(0);
musicImage.setImageResource(R.drawable.pic);
playButton.setBackgroundResource(R.drawable.play_select);
MainActivity.footer.setText("正在播放的歌曲");
break;
default:
break;
}
return super.onMenuItemSelected(featureId, item);
}
private class ButtonListener implements OnClickListener {
public void onClick(View v) {
switch (v.getId()) {
case R.id.button_last:
try {
Thread.sleep(80);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
if (MyApplication.getPlayMusicList().size() > 1) {
handler.removeCallbacks(runnable);
PlayService.stop();
musicImage.setImageResource(R.drawable.pic);
MyApplication.musicPosition = MyApplication.musicPosition - 1 < 0 ? MyApplication.getPlayMusicList().size() - 1 : MyApplication.musicPosition - 1;
- 51 -
Android 酷儿音乐播放器设计报告书
getMusicInfo(MyApplication.musicPosition);
playMusic();
} else {
Toast.makeText(context, "没有上一首", 0).show();
}
break;
case R.id.button_play:
if (MyApplication.playStatus == 0) {
if (name == null) {
Toast.makeText(context, "没有歌曲", 0).show(); } else {
playMusic();
}
} else if (MyApplication.playStatus == 1) {
handler.removeCallbacks(runnable);
PlayService.pause();
playButton.setBackgroundResource(R.drawable.play_select); } else if (MyApplication.playStatus == 2) {
PlayService.goon();
handler.post(runnable);
playButton.setBackgroundResource(R.drawable.pause_select); }
break;
case R.id.button_next:
try {
Thread.sleep(80);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
if (MyApplication.getPlayMusicList().size() > 1) {
handler.removeCallbacks(runnable);
PlayService.stop();
musicImage.setImageResource(R.drawable.pic);
next();
} else {
Toast.makeText(context, "没有下一首", 0).show();
}
break;
default:
break;
}
- 52 -
Android 酷儿音乐播放器设计报告书
}
}
public static void playMusic() {
Intent intent = new Intent(context, PlayService.class);
intent.putExtra("name", name);
intent.putExtra("path", path);
intent.putExtra("artist", artist);
context.startService(intent);
playButton.setBackgroundResource(R.drawable.pause_select);
musicTextView.setText(name);
TextView footer = (TextView) MainActivity.footer;
footer.setText(name);
handler.post(runnable);
new imageTask().execute();
}
public static void next() {
MyApplication.musicPosition = (MyApplication.musicPosition + 1) % MyApplication.getPlayMusicList().size();
getMusicInfo(MyApplication.musicPosition);
playMusic();
}
// PlayService中自动播放下一首歌曲用到的
public static HashMap<String, Object> getNextInfo() {
MyApplication.musicPosition = (MyApplication.musicPosition + 1) % MyApplication.getPlayMusicList().size();
HashMap<String, Object> map = MyApplication.getPlayMusicList().get(MyApplication.musicPosition);
return map;
}
private class onSeekBarListener implements OnSeekBarChangeListener {
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
}
- 53 -
Android 酷儿音乐播放器设计报告书
public void onStartTrackingTouch(SeekBar seekBar) { if (MyApplication.playStatus != 0) { handler.removeCallbacks(runnable); isChangeSeekbarP = true; } } public void onStopTrackingTouch(SeekBar seekBar) {
}
}
}
if (isChangeSeekbarP) { PlayService.player.seekTo(seekBar.getProgress()); handler.post(runnable); isChangeSeekbarP = false; } - 54 -
Android 酷儿音乐播放器设计报告书
PlayMusicListActivity.java
package com.huazi.Mp3Player;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import com.huazi.Mp3Player.Utils.DataUtils;
import com.huazi.Mp3Player.Utils.MyApplication; import com.huazi.Mp3Player.Utils.PlayUtils;
public class PlayMusicListActivity extends Activity {
public static ListView playMusicList;
public static MyListAdapter myListAdapter; public static Context context;
@Override
- 55 -
Android 酷儿音乐播放器设计报告书
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playmusic_list_layout);
context = this;
playMusicList = (ListView) findViewById(R.id.playMusicList);
myListAdapter = new MyListAdapter(this, MyApplication.getPlayMusicList(), new int[] { R.id.text_playMusicName, R.id.button_delete });
playMusicList.setAdapter(myListAdapter);
playMusicList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
HashMap<String, Object> map = MyApplication.getPlayMusicList().get(position);
if (map.get("name").equals(PlayService.name) && MyApplication.playStatus == 1) {
Toast.makeText(context, "正在播放...", 0).show();
}else {
PlayUtils.turnToPlay(map, context);
}
}
});
}
@Override
protected void onRestart() {
myListAdapter.notifyDataSetChanged();
super.onRestart();
}
@Override
protected void onResume() {
myListAdapter.notifyDataSetChanged();
myListAdapter.notifyDataSetInvalidated();
super.onResume();
}
@Override
- 56 -
Android 酷儿音乐播放器设计报告书
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 0, 0, R.string.text_deletePlayListMusics);
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == 0) {
new emptyPlayMusicListTask(myListAdapter).execute();
}
return super.onOptionsItemSelected(item);
}
public class emptyPlayMusicListTask extends AsyncTask<Void, Void, Void> { MyListAdapter myListAdapter;
public emptyPlayMusicListTask(MyListAdapter myListAdapter) { this.myListAdapter = myListAdapter;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... params) {
MyApplication.getPlayMusicList().clear();
return null;
}
@Override
protected void onPostExecute(Void result) {
myListAdapter.notifyDataSetChanged();
PlayService.stop();
MainActivity.footer.setText("正在播放的歌曲");
super.onPostExecute(result);
}
}
@Override
public boolean onKeyDown(int keyCode, android.view.KeyEvent event) {
- 57 -
Android 酷儿音乐播放器设计报告书
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { backDialog();
}
return false;
};
public void backDialog() {
AlertDialog.Builder builder = new Builder(this);
builder.setMessage("确认退出吗？");
builder.setTitle("提示");
builder.setPositiveButton("确认", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
((Activity) context).finish();
new AsyncTask<Void, Void, Void>(){
@Override
protected Void doInBackground(Void... params) {
if (MyApplication.playStatus != 0) {
PlayService.stop();
// PlayService.player.release();
}
DataUtils.upData_allLists();
return null;
}
}.execute();
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.create().show();
}
public class MyListAdapter extends BaseAdapter {
private class buttonViewHolder {
TextView musicName;
- 58 -
Android 酷儿音乐播放器设计报告书
ImageButton delete;
}
private ArrayList<HashMap<String, Object>> musicList;
private LayoutInflater mInflater;
private Context mContext;
private int[] valueViewID;
private buttonViewHolder holder;
public MyListAdapter(Context context, List<HashMap<String, Object>> appList, int[] to) {
musicList = (ArrayList<HashMap<String, Object>>) appList;
mContext = context;
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
valueViewID = to;
}
public int getCount() {
return musicList.size();
}
public Object getItem(int position) {
return musicList.get(position);
}
public long getItemId(int position) {
return position;
}
public void removeItem(int position) {
if (musicList.get(position).get("name").equals(PlayService.name)) {
PlayService.stop();
TextView footer = (TextView) MainActivity.footer;
footer.setText("正在播放的歌曲");
}
musicList.remove(position);
this.notifyDataSetChanged();
}
- 59 -
Android 酷儿音乐播放器设计报告书
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView != null) {
holder = (buttonViewHolder) convertView.getTag();
} else {
convertView = mInflater.inflate(R.layout.playmusic_list_item_layout, null); holder = new buttonViewHolder();
holder.musicName = (TextView) convertView.findViewById(valueViewID[0]);
holder.delete = (ImageButton) convertView.findViewById(valueViewID[1]); convertView.setTag(holder);
}
HashMap<String, Object> itemInfo
MyApplication.getPlayMusicList().get(position);
if (itemInfo != null) {
String aname = (String) itemInfo.get("name");
holder.musicName.setText(aname);
holder.delete.setOnClickListener(new deleOnClickListener(position)); }
return convertView;
}
class deleOnClickListener implements OnClickListener {
private int position;
public deleOnClickListener(int position) {
this.position = position;
}
public void onClick(View v) {
removeItem(position);
}
}
}
}
= - 60 -
Android 酷儿音乐播放器设计报告书
PlayService.java
package com.huazi.Mp3Player;
import java.io.IOException;
import java.util.HashMap;
import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener; import android.media.MediaPlayer.OnPreparedListener; import android.os.IBinder;
import android.widget.Toast;
import com.huazi.Mp3Player.Utils.MyApplication;
public class PlayService extends Service {
public static MediaPlayer player;
public static String name;
static String path;
static String artist;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
System.out.println("Service,onCreate!"); if (player == null) {
player = new MediaPlayer();
}
super.onCreate();
}
@Override
public void onStart(Intent intent, int startId) { super.onStart(intent, startId);
System.out.println("Service,onStart!"); - 61 -
Android 酷儿音乐播放器设计报告书
if (name == intent.getStringExtra("name")) {
Toast.makeText(PlayMusicAcitivity.context, "正在播放", 0).show();
} else {
name = intent.getStringExtra("name");
path = intent.getStringExtra("path");
artist = intent.getStringExtra("artist");
System.out.println(name+path+artist);
try {
play();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
player.setOnCompletionListener(new OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
player.reset();
MyApplication.playStatus = 0;
MyApplication.musicPosition = (MyApplication.musicPosition + MyApplication.getPlayMusicList().size();
HashMap<String, Object> map MyApplication.getPlayMusicList().get(MyApplication.musicPosition);
path = (String) map.get("path");
name = (String) map.get("name");
artist = (String) map.get("artist");
try {
play();
} catch (Exception e) {
System.out.println("播放有错误！");
% = - 62 - 1)
Android 酷儿音乐播放器设计报告书
}
}
});
}
void play() throws IllegalArgumentException, IllegalStateException, IOException { player.reset();
player.setDataSource(path);
player.prepareAsync();
player.setOnPreparedListener(new OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
if (player != null) {
player.start();
MyApplication.playStatus = 1;
for (int i = 0; i < MyApplication.getPlayMusicList().size(); i++) { if
(name.equals(MyApplication.getPlayMusicList().get(i).get("name"))) {
MyApplication.musicPosition = i;
break;
}
}
MainActivity.footer.setText(name);
MyApplication.playStatus = 1;
}
}
});
}
public static void pause() {
if (MyApplication.playStatus == 1) {
player.pause();
MyApplication.playStatus = 2;
}
}
public static void goon() {
if (MyApplication.playStatus != 0) {
player.start();
MyApplication.playStatus = 1;
}
}
- 63 -
Android 酷儿音乐播放器设计报告书
public static void stop() {
if (MyApplication.playStatus != 0) { player.stop();
MyApplication.playStatus = 0; }
}
}
- 64 -
Android 酷儿音乐播放器设计报告书
StartActivity.java
package com.huazi.Mp3Player;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Window;
import com.huazi.Mp3Player.Utils.DBHelper;
import com.huazi.Mp3Player.Utils.DataUtils;
import com.huazi.Mp3Player.Utils.MyApplication;
public class StartActivity extends Activity {
public static Context context;
private ContentResolver resolver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.start_layout);
context = this;
resolver = getContentResolver();
new AsyncTask<Void, Void, Void>(){
@Override
protected Void doInBackground(Void... params) {
SQLiteDatabase db = new DBHelper(context, "myData").getWritableDatabase();
db.execSQL("create table if not exists all_music (id integer primary key autoincrement not null, name varchar(50) , path varchar(100) , artist varchar(50))");
db.execSQL("create table if not exists play_music (id integer primary key autoincrement not null, name varchar(50) , path varchar(100) , artist varchar(50))");
db.execSQL("create table if not exists my_happy_music (id integer primary key autoincrement not null, name varchar(50) , path varchar(100) , artist varchar(50))");
db.execSQL("create table if not exists my_quiet_music (id integer primary key autoincrement not null, name varchar(50) , path varchar(100) , artist varchar(50))"); - 65 -
Android 酷儿音乐播放器设计报告书
db.execSQL("create table if not exists my_sad_music (id integer primary key autoincrement not null, name varchar(50) , path varchar(100) , artist varchar(50))"); db.close();
DataUtils.get_AllMusicListFD(context);
if (MyApplication.getAllMusicList().isEmpty()) {
DataUtils.update_AllMusicData(resolver,context);
}
DataUtils.get_AllListsFD();
return null;
}
@Override
protected void onPostExecute(Void result) {
startActivity(new Intent(context, MainActivity.class));
finish();
super.onPostExecute(result);
}
}.execute();
}
}
- 66 -
Android 酷儿音乐播放器设计报告书
DataUtils.java
package com.huazi.Mp3Player.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.provider.MediaStore;
import com.huazi.Mp3Player.MainActivity;
import com.huazi.Mp3Player.StartActivity;
public class DataUtils {
private static List<MusicDemo> musicList = new ArrayList<MusicDemo>();
public static void update_AllMusicData(ContentResolver resolver,Context context) { musicList.clear();
Cursor cursor
resolver.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
while (cursor.moveToNext()) {
// 歌曲的名称
String name
cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)); // 歌曲的歌手名
String artist
cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); // 歌曲文件的路径
String path
cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); musicList.add(new MusicDemo(name, path, artist));
}
DBHelper dbHelper = new DBHelper(context, "myData");
SQLiteDatabase db = dbHelper.getWritableDatabase();
db.execSQL("delete from all_music");
= null, = = = - 67 -
Android 酷儿音乐播放器设计报告书
if (!musicList.isEmpty()) { for (Iterator<MusicDemo> iterator = musicList.iterator(); iterator.hasNext();) {
MusicDemo demo = (MusicDemo) iterator.next();
ContentValues values = new ContentValues();
values.put("name", demo.getName());
values.put("path", demo.getPath());
values.put("artist", demo.getArtist());
db.insert("all_music", null, values);
}
}
db.close();
}
public static void get_AllMusicListFD(Context context) {
if (!MyApplication.getAllMusicList().isEmpty()) {
MyApplication.getAllMusicList().clear();
}
DBHelper dbHelper = new DBHelper(context, "myData");
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("select name,path,artist from all_music", null);
while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex("name"));
String path = cursor.getString(cursor.getColumnIndex("path"));
String artist = cursor.getString(cursor.getColumnIndex("artist"));
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("name", name);
map.put("path", path);
map.put("artist", artist);
MyApplication.getAllMusicList().add(map);
}
cursor.close();
db.close();
}
public static void get_PlayMusicListFD() {
if (!MyApplication.getPlayMusicList().isEmpty()) {
MyApplication.getPlayMusicList().clear();
}
DBHelper dbHelper = new DBHelper(StartActivity.context, "myData");
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("Select name,path,artist from play_music", null); while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex("name"));
String path = cursor.getString(cursor.getColumnIndex("path"));
- 68 -
Android 酷儿音乐播放器设计报告书
} String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getPlayMusicList().add(map); System.out.println(name + path + artist); } db.close(); public static void get_HappyMusicListFD() { if (!MyApplication.getHappyMusicList().isEmpty()) { MyApplication.getHappyMusicList().clear(); } DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery("Select name,path,artist from my_happy_music", null); while (cursor.moveToNext()) { String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); map.put("path", path); map.put("artist", artist); MyApplication.getHappyMusicList().add(map); } db.close(); } public static void get_QuietMusicListFD() { if (!MyApplication.getQuietMusicList().isEmpty()) { MyApplication.getQuietMusicList().clear(); } DBHelper dbHelper = new DBHelper(StartActivity.context, "myData"); SQLiteDatabase db = dbHelper.getReadableDatabase(); Cursor cursor = db.rawQuery("Select name,path,artist from my_quiet_music", null); while (cursor.moveToNext()) { String name = cursor.getString(cursor.getColumnIndex("name")); String path = cursor.getString(cursor.getColumnIndex("path")); String artist = cursor.getString(cursor.getColumnIndex("artist")); HashMap<String, Object> map = new HashMap<String, Object>(); map.put("name", name); - 69 -
Android 酷儿音乐播放器设计报告书
map.put("path", path);
map.put("artist", artist);
MyApplication.getQuietMusicList().add(map);
}
db.close();
}
public static void get_SadMusicListFD() {
if (!MyApplication.getSadMusicList().isEmpty()) {
MyApplication.getSadMusicList().clear();
}
DBHelper dbHelper = new DBHelper(StartActivity.context, "myData");
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.rawQuery("Select name,path,artist from my_sad_music", null); while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex("name"));
String path = cursor.getString(cursor.getColumnIndex("path"));
String artist = cursor.getString(cursor.getColumnIndex("artist"));
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("name", name);
map.put("path", path);
map.put("artist", artist);
MyApplication.getSadMusicList().add(map);
}
db.close();
}
public static void get_AllListsFD() {
get_AllMusicListFD(StartActivity.context);
get_HappyMusicListFD();
get_PlayMusicListFD();
get_QuietMusicListFD();
get_SadMusicListFD();
}
public static void upData_Lists(Context context,String table_name) {
List<HashMap<String, Object>> musicList = new ArrayList<HashMap<String, Object>>();
if (table_name.equals("play_music")) {
musicList = MyApplication.getPlayMusicList();
}
else if (table_name.equals("my_happy_music")) {
musicList = MyApplication.getHappyMusicList();
}
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Android 酷儿音乐播放器设计报告书
else if (table_name.equals("my_quiet_music")) {
musicList = MyApplication.getQuietMusicList();
}
else if (table_name.equals("my_sad_music")) {
musicList = MyApplication.getSadMusicList();
}
else{
System.out.println("table name error!");
}
SQLiteDatabase db = new DBHelper(context, "myData").getWritableDatabase(); db.execSQL("delete from " + table_name);
db.execSQL("update sqlite_sequence SET seq = 0 where name = '"+ table_name+"'"); for (Iterator<HashMap<String, Object>> iterator = musicList.iterator(); iterator.hasNext();) {
HashMap<String, Object> hashMap = (HashMap<String, Object>) iterator.next(); ContentValues values = new ContentValues();
values.put("name", (String) hashMap.get("name"));
values.put("path", (String) hashMap.get("path"));
values.put("artist", (String) hashMap.get("artist"));
db.insert(table_name, null, values);
}
db.close();
}
public static void upData_allLists() {
upData_Lists(MainActivity.context,"play_music");
upData_Lists(MainActivity.context,"my_happy_music");
upData_Lists(MainActivity.context,"my_quiet_music");
upData_Lists(MainActivity.context,"my_sad_music");
}
}
- 71 -
Android 酷儿音乐播放器设计报告书
DBHelper.java
package com.huazi.Mp3Player.Utils;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper{
private static final int VERSION = 1;
public DBHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, factory, version);
}
public DBHelper(Context context, String name, int version){
this(context, name, null, version);
}
public DBHelper(Context context, String name){
this(context, name, VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
System.out.println("Create a Database!!!!!!!!!!!!!!!");
}
@Override
public void onOpen(SQLiteDatabase db) {
// TODO Auto-generated method stub
super.onOpen(db);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { System.out.println("Upgrade a Database");
}
}
- 72 -
Android 酷儿音乐播放器设计报告书
ImageUtils.java
package com.huazi.Mp3Player.Utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
public class ImageUtils {
private static String filename = null;
private static Map<String, String> imageMap = new HashMap<String, String>();
private ImageUtils() {
}
/**
* 将inputstream流写入path中名字为filename
*
* @param is
* 输入流
* @param path
* 要存放的路径
* @param filename
* 文件名
*/
public static void writeToLocal(InputStream is, String path) {
OutputStream os = null;
try {
os = new FileOutputStream(new File(path + filename));
byte[] b = new byte[4096];
int read = 0;
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Android 酷儿音乐播放器设计报告书
while (-1 != (read = is.read(b, 0, 4096))) {
os.write(b, 0, read);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (os != null) {
os.close();
}
if (is != null) {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static InputStream getInputstreamByKeyWord(String keyword) {
InputStream iss = null;
InputStream is = null;
try {
String url = "/pics?query=" + URLEncoder.encode(keyword, "GB2312");
URL u = new URL(url);
URLConnection uc = u.openConnection();
is = uc.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "GB2312"));
String buffer = null;
StringBuilder sb = new StringBuilder();
- 74 -
Android 酷儿音乐播放器设计报告书
}
} while (null != (buffer = reader.readLine())) { sb.append(buffer); } String content = sb.toString(); int httpPoint = content.indexOf("src=\"http"); int titlePoint = content.indexOf("title", httpPoint); String imageUrl = content.substring(httpPoint + 5, titlePoint - 2); filename = imageUrl.substring(imageUrl.lastIndexOf("/") + 1); URL imageHttpUrl = new URL(imageUrl); URLConnection imageUrlConnection = imageHttpUrl.openConnection(); iss = imageUrlConnection.getInputStream(); } catch (Exception e) { e.printStackTrace(); } return iss; public static Map<String, String> generateImageFromSouGou(String path, String keyword) { InputStream is = getInputstreamByKeyWord(keyword); } imageMap.put(keyword, filename); writeToLocal(is, path); return imageMap; public static Map<String, String> generateImageFromSouGou(String keyword) { return generateImageFromSouGou("/", keyword); }
- 75 -
Android 酷儿音乐播放器设计报告书
LyricView.java
package com.huazi.Mp3Player.Utils;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
public final class LyricView extends View {
public LyricView(Context context) { super(context);
}
// 歌词对象
private SongLyric lrc = null; // 当前播放时间
private long time = 0l;
// 字体画笔
private Paint fontPaint = null; // 当前歌词字体画笔
private Paint lrcPaint = null;
// 字体颜色
private int fontColor = Color.GRAY; // 当前歌词字体颜色
private int lrcColor = Color.WHITE; // 字体大小
private int fontSize = 12;
/**
* 设置歌词对象
*
* @param lrc
*/
public void setLyric(SongLyric lrc) { this.lrc = lrc;
}
/**
* 设置当前时间
*
* @param ms
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Android 酷儿音乐播放器设计报告书
*/
public void setTime(long ms) {
this.time = ms;
}
/**
* 设置歌词字体颜色
*
* @param color
*/
public void setFontColor(int color) { this.fontColor = color;
}
/**
* 设置当前歌词字体颜色
*
* @param color
*/
public void setLyricColor(int color) { this.lrcColor = color;
}
/**
* 设置字体大小
*
* @param size
*/
public void setFontSize(int size) { this.fontSize = size;
}
/**
* 重绘视图
*/
@Override
protected void onDraw(Canvas c) { super.onDraw(c);
if (lrc != null) {
try {
if (fontPaint == null) {
fontPaint = new Paint(); }
if (lrcPaint == null) {
- 77 -
Android 酷儿音乐播放器设计报告书
}
}
}
lrcPaint = new Paint(); } fontPaint.setColor(fontColor); fontPaint.setTextSize(fontSize); lrcPaint.setColor(lrcColor); lrcPaint.setTextSize(fontSize); // 获取当前要播放歌词的索引 int cIndex = lrc.getIndex(time); // 计算绘制歌词y坐标 int h = getHeight() / 2 - cIndex * fontSize * 3 / 2 - (int) ((fontSize * 3 / 2) * (lrc.getOffset(time) / (float) lrc .getNextTime(time))); Long[] ts = lrc.getAllTimes(); // 循环绘制每一行歌词，当前播放歌词特殊绘制 for (Long l : ts) { c.drawText(lrc.get(l), 0, h, lrc.getIndex(l) == cIndex ? lrcPaint : fontPaint); h += fontSize * 3 / 2; } } catch (Exception e) { } - 78 -
Android 酷儿音乐播放器设计报告书
MusicDemo.java
package com.huazi.Mp3Player.Utils;
import java.io.Serializable;
public class MusicDemo implements Serializable{
- 79 - private static final long serialVersionUID = 1L; private String name; private String path; private String artist; public MusicDemo() { } public MusicDemo(String name, String path ,String artist) { } @Override public String toString() { } return "MusicDemo [name=" + name + ", path=" + path + ", artist=" + artist super(); this.name = name; this.path = path; this.artist = artist; // TODO Auto-generated constructor stub + "]"; public String getName() { } return name; public void setName(String name) { } this.name = name;
Android 酷儿音乐播放器设计报告书
public String getPath() {
return path;
}
public void setPath(String path) { this.path = path;
}
public String getArtist() {
return artist;
}
public void setArtist(String artist) { this.artist = artist;
}
}
- 80 -
Android 酷儿音乐播放器设计报告书
MyApplication.java
package com.huazi.Mp3Player.Utils;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Application;
public class MyApplication extends Application {
private static List<HashMap<String, Object>> playMusicList ArrayList<HashMap<String, Object>>();
private static List<HashMap<String, Object>> allMusicList ArrayList<HashMap<String, Object>>();
private static List<HashMap<String, Object>> happyMusicList ArrayList<HashMap<String, Object>>();
private static List<HashMap<String, Object>> quietMusicList ArrayList<HashMap<String, Object>>();
private static List<HashMap<String, Object>> sadMusicList ArrayList<HashMap<String, Object>>();
public static int playStatus ;
public static int musicPosition;
@Override
public void onCreate() {
super.onCreate();
}
public static List<HashMap<String, Object>> getPlayMusicList() {
return playMusicList;
}
public static List<HashMap<String, Object>> getAllMusicList() {
return allMusicList;
}
public static List<HashMap<String, Object>> getQuietMusicList() { return quietMusicList;
}
= new = new = new = new = new - 81 -
Android 酷儿音乐播放器设计报告书
public static List<HashMap<String, Object>> getSadMusicList() { return sadMusicList;
}
public static List<HashMap<String, Object>> getHappyMusicList() { return happyMusicList;
}
@Override
public void onTerminate() {
// TODO Auto-generated method stub
super.onTerminate();
}
}
- 82 -
Android 酷儿音乐播放器设计报告书
PlayUtils.java
package com.huazi.Mp3Player.Utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.content.Intent;
import android.os.Environment;
import android.widget.TextView;
import android.widget.Toast;
import com.huazi.Mp3Player.MainActivity;
import com.huazi.Mp3Player.PlayMusicListActivity;
import com.huazi.Mp3Player.PlayService;
import com.huazi.Mp3Player.R;
public class PlayUtils {
public static boolean addMusicToList(Context context, HashMap<String, Object> map, List<HashMap<String, Object>> toList) {
if (new File((String) map.get("path")).exists()) {
if (toList.contains(map)) {
Toast.makeText(context, "播放列表已存在", 0).show();
return true;
} else {
toList.add(map);
Toast.makeText(context, "添加OK!", 0).show();
return true;
}
} else {
Toast.makeText(context, R.string.text_gequbucunzai, 0).show();
return false;
- 83 -
Android 酷儿音乐播放器设计报告书
}
}
public static void turnToPlay(HashMap<String, Object> map, Context context) {
String name = (String) map.get("name");
String path = (String) map.get("path");
String artist = (String) map.get("artist");
if (new File(path).exists()) {
Intent intent = new Intent(context, PlayService.class);
intent.putExtra("name", name);
intent.putExtra("path", path);
intent.putExtra("artist", artist);
context.startService(intent);
TextView footer = (TextView) MainActivity.footer;
footer.setText(name);
} else {
Toast.makeText(context, name + context.getResources().getString(R.string.text_gequbucunzai), 0).show();
}
}
public static void turnToPlay_List(Context context, List<HashMap<String, Object>> musicList) {
if (!musicList.isEmpty()) {
for (int i = 0; i < musicList.size(); i++) {
HashMap<String, Object> map = musicList.get(i);
if (new File((String) map.get("path")).exists()) {
if (!MyApplication.getPlayMusicList().contains(map)) {
MyApplication.getPlayMusicList().add(map);
}
} else {
String name = (String) map.get("name");
Toast.makeText(context, name + context.getResources().getString(R.string.text_gequbucunzai), 0).show();
}
}
PlayMusicListActivity.myListAdapter.notifyDataSetChanged();
HashMap<String, Object> map = musicList.get(0);
turnToPlay(map, context);
} else {
Toast.makeText(MainActivity.context, "该收藏夹中没有音乐", 0).show(); - 84 -
Android 酷儿音乐播放器设计报告书
}
}
public static InputStream getInputstreamByKeyWord(String keyword) {
InputStream iss = null;
InputStream is = null;
try {
String url = "/pics?query=" + URLEncoder.encode(keyword, "GB2312");
URL u = new URL(url);
URLConnection uc = u.openConnection();
is = uc.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "GB2312"));
String buffer = null;
StringBuilder sb = new StringBuilder();
while (null != (buffer = reader.readLine())) {
sb.append(buffer);
}
String content = sb.toString();
int httpPoint = content.indexOf("src=\"http");
int titlePoint = content.indexOf("title", httpPoint);
String imageUrl = content.substring(httpPoint + 5, titlePoint - 2);
// filename = imageUrl.substring(imageUrl.lastIndexOf("/") + 1);
URL imageHttpUrl = new URL(imageUrl);
URLConnection imageUrlConnection = imageHttpUrl.openConnection();
iss = imageUrlConnection.getInputStream();
} catch (Exception e) {
- 85 -
Android 酷儿音乐播放器设计报告书
e.printStackTrace();
}
return iss;
}
public static String SDCardRoot
Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator;
public static File creatSDDir(String dir) {
File dirFile = new File(SDCardRoot + dir + File.separator);
System.out.println(dirFile.mkdirs());
return dirFile;
}
public static File createFileInSDCard(String fileName, String dir) throws IOException { File file = new File(SDCardRoot + dir + File.separator + fileName);
System.out.println("file---->" + file);
boolean b = file.createNewFile();
System.out.println("---------->" + b);
return file;
}
public static File write2SDFromInput(String path, String fileName, InputStream input) {
File file = null;
OutputStream output = null;
try {
creatSDDir(path);
file = createFileInSDCard(fileName, path);
output = new FileOutputStream(file);
byte buffer[] = new byte[4 * 1024];
int temp;
while ((temp = input.read(buffer)) != -1) {
output.write(buffer, 0, temp);
}
output.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (Exception e) {
= - 86 -
Android 酷儿音乐播放器设计报告书
e.printStackTrace(); } } return file; } public static String getLrcFile(Context context, String musicName, String musicPath) { String lrcFileName = musicName + ".lrc"; String lrcFilePath = musicPath.substring(0, -(musicName.length() + 4)) + lrcFileName; if (new File(lrcFilePath).exists()) {
return lrcFilePath;
} else {
return null;
}
}
}
- 87 -
Android 酷儿音乐播放器设计报告书
SongLyric.java
package com.huazi.Mp3Player.Utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 歌词对象
*
* @author samsung
*
*/
public final class SongLyric {
// 歌名
private String title = "";
// 歌手名
private String artist = "";
// 专辑名
private String album = "";
// 偏移时间
private long offset = 0;
// 最大时间
private long maxTime = 0;
// 歌词内容
private Map<Long, String> lrcs = new HashMap<Long, String>();
// 验证是否通过
private boolean valid = false;
public SongLyric(String url) {
File file = new File(url);
if (file.exists()) {
try {
// 构建读取器
BufferedReader br = new BufferedReader(new InputStreamReader( new FileInputStream(file), "gbk"));
String line = null;
- 88 -
Android 酷儿音乐播放器设计报告书
while ((line = br.readLine()) != null) { dealLine(line);
}
valid = true;
} catch (Exception e) {
System.out.println("Exception"); }
}
}
public String getTitle() {
return this.title;
}
public String getArtist() {
return this.artist;
}
public String getAlbum() {
return this.album;
}
public boolean isValid() {
return this.valid;
}
public long getMaxTime() {
return this.maxTime;
}
public void setMaxTime(long time) {
this.maxTime = time;
}
/**
* 获取该时间应当显示的歌词
*
* @param ls
* @return
*/
public String get(long ls) {
long time = ls + offset;
Long curr = -1l;
for (Long l : lrcs.keySet()) {
- 89 -
Android 酷儿音乐播放器设计报告书
curr = l > time ? curr : l < curr ? curr : l; }
return lrcs.get(curr);
}
/**
* 获取该时间所要显示的歌词初始时间的索引 *
* @param ls
* @return
*/
public int getIndex(long ls) {
Long[] ts = getAllTimes();
for (int i = 0; i < ts.length - 1; i++) {
if (ls + offset >= ts[i] && ls + offset < ts[i + 1]) { return i;
}
}
return ts.length - 1;
}
/**
* 获取该时间与歌词初始时间差值
*
* @param ls
* @return
*/
public int getOffset(long ls) {
Long[] ts = getAllTimes();
int index = getIndex(ls);
if (index < ts.length && index >= 0) {
return (int) (ls + offset - ts[index]);
}
return 0;
}
/**
* 获取该时间段播放的歌词共播放时间
*
* @param ls
* @return
*/
public int getNextTime(long ls) {
Long[] ts = getAllTimes();
- 90 -
Android 酷儿音乐播放器设计报告书
int index = getIndex(ls);
if (index < ts.length - 1) {
return (int) (ts[index + 1] - ts[index]);
}
return 0;
}
/**
* 处理歌词行
*
* @param line
*/
private void dealLine(String line) {
if (line != null && !line.equals("")) {
if (line.startsWith("[ti:")) {// 标题
title = line.substring(4, line.length() - 1);
} else if (line.startsWith("[ar:")) {// 歌手
artist = line.substring(4, line.length() - 1);
} else if (line.startsWith("[al:")) {// 专辑
album = line.substring(4, line.length() - 1);
} else if (line.startsWith("[offset:")) {// 专辑
offset = Long.parseLong(line.substring(8, line.length() - 1)); } else {
// 该行歌词内容
Pattern ptn = Pattern.compile("\\[(\\d{2}:\\d{2}\\.\\d{2})\\]"); Matcher mth = ptn.matcher(line);
while (mth.find()) {
// 得到时间点
long time = strToLong(mth.group(1));
// 得到时间点后的内容
String[] str = ptn.split(line);
String lrc = str.length > 0 ? str[str.length - 1] : ""; lrcs.put(time, lrc);
maxTime = maxTime > time ? maxTime : time; }
}
}
}
/**
* 将00:00.00格式的歌词时间转换为long
*
* @param timeStr
* @return
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*/
public static long strToLong(String timeStr) { String[] s = timeStr.split(":");
int min = Integer.parseInt(s[0]);
String[] ss = s[1].split("\\.");
int sec = Integer.parseInt(ss[0]);
int mill = Integer.parseInt(ss[1]);
return min * 60 * 1000 + sec * 1000 + mill * 10; }
/**
* 处理毫秒数，以00:00的方式返回
*
* @param ts
* @return
*/
public static String longToString(long ts) {
int time = (int) ts / 1000;
int ms = time % 60;
int ss = time / 60;
ss = ss > 99 ? 99 : ss;
StringBuffer str = new StringBuffer();
str.append(ss < 10 ? "0" + ss + ":" : ss + ":"); str.append(ms < 10 ? "0" + ms : ms + ""); return str.toString();
}
/**
* 获取顺序时间数组对象
*
* @return
*/
public Long[] getAllTimes() {
Long[] ts = new Long[lrcs.size()];
int index = 0;
for (Long l : lrcs.keySet()) {
ts[index++] = l;
}
for (int i = 0; i < ts.length - 1; i++) {
for (int j = i; j < ts.length; j++) {
if (ts[i] > ts[j]) {
Long tmp = ts[i];
ts[i] = ts[j];
ts[j] = tmp;
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} } } } } return ts;
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四、程序设计结果及测试分析
经过在手机上运行，程序可以流畅地播放音乐，无卡顿现象，可以从音乐列表的第一栏播放到最后一栏，实时准确地显示播放进度信。按钮上一曲、下一曲及停止都可以正确地作用，暂停按钮在音乐播放的时候可以正确显示并作用，当被点击之后，即显示为播放按钮，此时点击该按钮也可以正确播放音乐。
经测试，最终得到的程序可以在手机上运行，并无任何bug及程序不响应现象。
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4.1 程序运行效果图
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、
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4.2 程序调试过程
ADT工具附有LogCat工具，在函数的开始结束及分支处设置特定文字标记内容，即可以在LogCat工具中打印调试内容，这对于bug的判断及追踪有很大帮助，并了解程序的运行流程。图4-2是LogCat工具使用的截图。
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图4-2
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五、实验总结
由于对android的接触较少，所以也遇到了一些问题，无论是哪种语言首先要有自己的思路，接下来就是通过语言的实现。我主要遇到android的四大组件的理解和使用，刚开始不知道如何用相关的组件，而且android的组件相当的多，就老师上课讲的相关知识比较少，对于我们初学者学习比较困难，而且，只是不是那么的连贯和详细，上课的时间只是跟上老师再敲代码，实现一个具体的功能，但是不有真正的弄懂它的使用方法,所以，我们在课设中出现很多问题。今后安卓界面设计和java语言使用能力需要加强。
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六、参考资料 参考书籍
《android应用开发揭秘》 《android一日游》
《安卓开发实战经典》 部分参考资料来自
安卓技术论坛网站
安卓开发爱好者网站
百度文库
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