Android实验报告生命周期

Android 开发

（实验四）

实验题目：Activity生命周期验证试验

指导老师：

班级：计算机科学与技术系班

姓名：（

一、 实验目的

1、深入理解Activity运行机制和原理。

2、掌握Activity的声明周期各个阶段工作流程。

3、掌握多个Activity之间生命周期的转换过程。

4、通络Intent实现多页面之间数据的传递(辅助完成)。

二、 实验内容

1、搭建任意组件，设计多个界面，运行程序观察其生命周期的情况。

2、使用Intent实现页面之间数据的传递。

三、 实验代码

AlifecyfleActivity.java

package com.wr;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class AlifecycleActivity extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

Button BtnStart = (Button) findViewById(R.id.BtnStart);

BtnStart.setOnClickListener(new MyBtnClickListener());

}

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

System.out.println("AlifecycleActivity:onDestroy()");

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

System.out.println("AlifecycleActivity:onPause()");

}

@Override

protected void onRestart() {

// TODO Auto-generated method stub

super.onRestart();

System.out.println("AlifecycleActivity:onRestart()");

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

System.out.println("AlifecycleActivity:onResume()");

}

@Override

protected void onStart() {

// TODO Auto-generated method stub

super.onStart();

System.out.println("AlifecycleActivity:onStart()");

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

super.onStop();

System.out.println("AlifecycleActivity:onStop()");

}

public class MyBtnClickListener implements OnClickListener {

//重写点击事件处理方法

public void onClick(View arg0) {

// TODO Auto-generated method stub

Intent intent = new Intent(AlifecycleActivity.this,AlcActivity2.class);//创建意图对象

//使用意图对象打开一个新的Activity

startActivity(intent);

}

AlcActivity.java

package com.wr;

import android.app.Activity;

import android.os.Bundle;

public class AlcActivity2 extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.alcactivity2_main);

}

@Override

protected void onDestroy() {

// TODO Auto-generated method stub

super.onDestroy();

System.out.println("AlcActivity2:onDestroy()");

}

@Override

protected void onPause() {

// TODO Auto-generated method stub

super.onPause();

System.out.println("AlcActivity2:onPause()");

}

@Override

protected void onRestart() {

// TODO Auto-generated method stub

super.onRestart();

System.out.println("AlcActivity2:onRestart()");

}

@Override

protected void onResume() {

// TODO Auto-generated method stub

super.onResume();

System.out.println("AlcActivity2:onResume()");

}

@Override

protected void onStart() {

// TODO Auto-generated method stub

super.onStart();

System.out.println("AlcActivity2:onStart()");

}

@Override

protected void onStop() {

// TODO Auto-generated method stub

super.onStop();

System.out.println("AlcActivity2:onStop()");

}

IntentActivity.java

package com.gml;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

public class IntentActivity extends Activity {

private TextView txtShow;

private Button btnPage2;

private String name;

private int age;

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

txtShow = (TextView) findViewById(R.id.txtShow);

btnPage2 = (Button) findViewById(R.id.btnPage2);

btnPage2.setOnClickListener(myListener);

name = "Mary";

age = 27;

String s = "姓名："+name+"\n\r"+"年龄："+age;

txtShow.setText(s);

}

@Override

//接收被调程序传回的数据，必须重载onActiveResult()方法。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

// TODO Auto-generated method stub

super.onActivityResult(requestCode, resultCode, data);

if(requestCode==ACTIVITY_EDIT){

if(resultCode==RESULT_OK){

Bundle bundle = data.getExtras();

age = bundle.getInt("AGE");

String s= "姓名："+name+"\n\r"+"年龄："+age;

txtShow.setText(s);

}

if(resultCode==RESULT_CANCELED);

}

private static final int ACTIVITY_EDIT = 1;

private Button.OnClickListener myListener = new Button.OnClickListener(){

public void onClick(View v){

Intent intent = new Intent();

//使用setClass()确定Intent的发件人和收件者，IntentActivity传递给Second.

intent.setClass(IntentActivity.this, OneActivity.class);

//使用Bundle对象的put()方法打包数据，并利用putExtras()来进行传递

Bundle bundle = new Bundle();

bundle.putString("NAME", name);

bundle.putInt("AGE", age);

intent.putExtras(bundle);

//用startActivityForResult()方法取代startAcctivity()方法将包里寄出，并等待另一方的回音。

startActivityForResult(intent,ACTIVITY_EDIT);

}

};

}

OneActivity.java

package com.gml;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class OneActivity extends Activity{

EditText edtAge;

int age;

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.page1);

TextView txtName = (TextView) findViewById(R.id.txtName);

edtAge = (EditText) findViewById(R.id.edtAge);

Button btnSure = (Button) findViewById(R.id.btnSure);

Button btnCancel = (Button) findViewById(R.id.btnCancel);

btnSure.setOnClickListener(myListener);

btnCancel.setOnClickListener(myListener);

//使用onCreat方法取出Intent数据，并获取Bundle对象中名称为NAME、AGE的数据

Intent intent = this.getIntent();

Bundle bundle = intent.getExtras();

String name = bundle.getString("NAME");

int age = bundle.getInt("AGE");

txtName.setText("姓名："+name);

edtAge.setText(""+age);

}

private Button.OnClickListener myListener = new Button.OnClickListener(){

public void onClick(View v){

if (v.getId()==R.id.btnSure){

//创建Intent对象

Intent intent = new Intent();

//将回传的数据放入Bundle中，再把这个Bundle交给Intent处理

age =Integer.parseInt(edtAge.getText().toString());

Bundle bundle = new Bundle();

bundle.putInt("AGE",age);

intent.putExtras(bundle);

//最后使用setResult()方法将Intent传回，同时必须传回一个结果的代码。

setResult(RESULT_OK,intent);

finish();

}

if(v.getId()==R.id.btnCancel){

setResult(RESULT_CANCELED);

finish();}

}

};}

四、 实验结果

五、 实验总结

1、通过本次实验了解了Activity生命周期的运行过程。

2、通过本次实验Intent实现多页面之间数据的传递。

3、实验中遇到的问题通过与老师和同学讨论也已得到解决。

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