package com.itheima.exit;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.AlertDialog.Builder;

import android.content.DialogInterface;

import android.content.DialogInterface.OnClickListener;

import android.os.Bundle;

public class MainActivity extends Activity {

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

}

@Override

public void onBackPressed() {

AlertDialog.Builder builder = new Builder(this);

builder.setTitle("提醒");

builder.setMessage("确定退出当前应用程序吗?");

builder.setPositiveButton("立刻退出", new OnClickListener() {

public void onClick(DialogInterface dialog, int which) {

finish();//关闭当前的activity

//把自己的进程杀死

//自杀的方法

android.os.Process.killProcess(android.os.Process.myPid());

}

});

builder.setNegativeButton("取消", null);

builder.show();

}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity" >

<EditText

android:hint="请输入要杀死的进程包名"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:id="@+id/et_packname"/>

<Button

android:onClick="click"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_centerHorizontal="true"

android:layout_centerVertical="true"

android:text="杀死进程"/>

</RelativeLayout>

package com.itheima.killother;

import android.app.Activity;

import android.app.ActivityManager;

import android.os.Bundle;

import android.view.View;

import android.widget.EditText;

public class MainActivity extends Activity {

private ActivityManager am;//相当于进程管理器

private EditText et_packname;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

//所有程序的开启都是由Activity的ActivityManager来管理的

am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);

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

}

public void click(View view) {

String packname = et_packname.getText().toString().trim();

//注意要杀死别的进程需要加上权限

//<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"/>

//这里中方式只是杀死别人，注意：手机里面有些进程是杀死不掉的，比如电话进程

am.killBackgroundProcesses(packname);

}

}