Andoird 监听开机广播和关机广播

需求:有时候,我们需要自己的程序在开机后自动运行;在关机时,记录一些信息到文件中.

一、开机广播监听
Android系统启动完成后会自动发出启动完成广播(android.intent.action.BOOT_COMPLETED),
所有注册了接收启动完成广播的接收器(BroadcastReceiver)都会收到此广播.

①编写一个继承BroadcastReceiver的类,接受系统启动完成广播.

package com.example.systemtest;



import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;



/**

 * 系统启动完成广播接收器

 * #<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

 * @author Lone_Wolf

 */

public class BootCompletedReceiver extends BroadcastReceiver {

    @Override

    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {

            //example:启动程序

            Intent start = new Intent(context, MainActivity.class);

            start.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);//

            context.startActivity(start);

        }

    }

}

②在AndroidManifest.xml文件里注册广播接收器.

<receiver android:name="com.example.systemtest.BootCompletedReceiver" >  

    <intent-filter>   

        <!-- 开机广播 -->  

        <action android:name="android.intent.action.BOOT_COMPLETED" />  

    </intent-filter>   

</receiver>

③添加相应权限.

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

 

二、关机广播监听
与开机广播对应,Android系统在即将关闭时发出系统关闭广播(android.intent.action.ACTION_SHUTDOWN).

①编写一个继承BroadcastReceiver的类,接受系统关闭广播.

package com.example.systemtest;



import java.io.File;

import java.io.FileOutputStream;



import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;



/**

 * 系统关闭广播接收器

 * @author Lone_Wolf

 */

public class ShutdownReceiver extends BroadcastReceiver {

    @Override

    public void onReceive(Context context, Intent intent) {

        if (intent.getAction().equals(Intent.ACTION_SHUTDOWN)) {

            //example:写入文件

            FileOutputStream fos;

            try {

                fos = new FileOutputStream(

                          android.os.Environment.getExternalStorageDirectory()

                          + File.separator + "SysLog.txt", true);

                fos.write("系统退出".getBytes("utf-8"));

                fos.close();

            } catch (Exception e) {

                e.printStackTrace();

            }           

        }

    }

}

②在AndroidManifest.xml文件里注册广播接收器.

<receiver android:name="com.example.systemtest.ShutdownReceiver" >  

    <intent-filter>   

        <!-- 关机广播 -->  

        <action android:name="android.intent.action.ACTION_SHUTDOWN" />  

    </intent-filter>   

</receiver>

 

注: onReceive中代码的执行时间不要超过5s,否则android会弹出超时dialog.
     如果需要做耗时处理,可以在onReceive()里开始一个Service,让Service去做耗时处理.
     最好不要用子线程,因为BroadcastReceiver的生命周期很短,子线程可能还没有结束BroadcastReceiver就先结束了.