Android(安卓)完全退出程序

程序运行时我直接就从MainActivity跳转到BActivity,在BActivity有个“退出程序”菜单，点击会退出程序。具体过程如下：第二步:定义一个工具类Sysutil用来退出程序，这样定义好处可以在多个Activity的时候复用，代码如下:
package com.gt.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

// 这里用来接受退出程序的指令
@Override
protected void onStart() {
int flag = getIntent().getIntExtra( "flag", 0);
System.out.println( "onStart"+flag);
if (flag == SysUtil.EXIT_APPLICATION) {
finish();
}
super.onResume();
}

// 程序启动后就进入了BActivity
@Override
protected void onResume() {
Intent mIntent = new Intent();
mIntent.setClass( this, BActivity. class);
startActivity(mIntent);
super.onStart();
}

// 当activity是单例的时候,再次启动该activity就不会再调用 oncreate->onstart这些方法了
@Override
protected void onNewIntent(Intent intent) {
int flag = intent.getIntExtra( "flag", 0);
System.out.println( "onNewIntent"+flag);
if (flag == SysUtil.EXIT_APPLICATION) {
System.out.println( "关闭");
finish();
}
super.onNewIntent(intent);
}
} package com.gt.test;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class BActivity extends Activity {
public static final int MENU_EXITAPPLICATION = Menu.FIRST;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

TextView mTextView = new TextView( this);
mTextView.setText( "Welcome to Frankie's blog.");
setContentView(mTextView);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, MENU_EXITAPPLICATION, 0, "退出程序");
return super.onCreateOptionsMenu(menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == MENU_EXITAPPLICATION) {
// 其他Activity退出程序这样调用就ok了
SysUtil mSysUtil = new SysUtil(BActivity. this);
mSysUtil.exit();
System.out.println( "onOptionsItemSelected");
}
return super.onOptionsItemSelected(item);
}
} package com.gt.test;

import android.content.Context;
import android.content.Intent;

public class SysUtil {
public static final int EXIT_APPLICATION = 0x0001;

private Context mContext;

public SysUtil(Context context) {
this.mContext = context;
}

// 完全退出应用
public void exit() {
Intent mIntent = new Intent();
mIntent.setClass(mContext, MainActivity. class);
// 这里设置flag还是比较重要的
mIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// 发出退出程序指示
mIntent.putExtra( "flag", EXIT_APPLICATION);
mContext.startActivity(mIntent);
System.out.println( "exit");
}
} <? xml version ="1.0" encoding ="utf-8" ?>
< manifest xmlns:android ="http://schemas.android.com/apk/res/android"
package ="com.gt.test" android:versionCode ="1" android:versionName ="1.0" >
< uses-sdk android:minSdkVersion ="9" />

< application android:icon ="@drawable/icon" android:label ="@string/app_name" >

< activity android:name =".MainActivity" android:launchMode ="singleTop"
android:label ="@string/app_name" >
< intent-filter >
< action android:name ="android.intent.action.MAIN" />
< category android:name ="android.intent.category.LAUNCHER" />
</ intent-filter >
</ activity >

< activity android:name =".BActivity" />
</ application >
</ manifest >

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