Android中让Service被关闭后再重新启动

转自：http://blog.csdn.net/rex_amaker/article/details/7049039

如何做到开机启动？

只要实现一个BroadcastReceiver，监听手机启动完成的事件ACTION_BOOT_COMPLETED即可。需要注意的是，好像不能用模拟器，要用手机测试。

那如何做到启动一个Service，并且在用户关闭后能自动又启动了呢？

一般的，都会在上面说到的BroadcastReceiver的实现里面，监听手机启动完成后，启动一个Service，这是一般的做法。问题是，用户可以关闭掉该Service。那么怎样才能使它被关闭掉以后，再次启动呢？聪明的你一定立即就想到了，如果不直接启动Service，而是启动一个timmer，或者alarmManager，然后每隔一段时间去启动Service，就可以了。

package com.arui.framework.android.daemonservice;  

import android.app.AlarmManager;  
import android.app.PendingIntent;  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.os.SystemClock;  

public class BootBroadcast extends BroadcastReceiver {  

    @Override  
    public void onReceive(Context context, Intent mintent) {  

        if (Intent.ACTION_BOOT_COMPLETED.equals(mintent.getAction())) {  
            // 启动完成  
            Intent intent = new Intent(context, Alarmreceiver.class);  
            intent.setAction("arui.alarm.action");  
            PendingIntent sender = PendingIntent.getBroadcast(context, 0,  
                    intent, 0);  
            long firstime = SystemClock.elapsedRealtime();  
            AlarmManager am = (AlarmManager) context  
                    .getSystemService(Context.ALARM_SERVICE);  

            // 10秒一个周期，不停的发送广播  
            am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, firstime,  
                    10 * 1000, sender);  
        }  

    }  
} 

package com.arui.framework.android.daemonservice;    import android.content.BroadcastReceiver;  import android.content.Context;  import android.content.Intent;    public class Alarmreceiver extends BroadcastReceiver {      @Override      public void onReceive(Context context, Intent intent) {            if (intent.getAction().equals("arui.alarm.action")) {              Intent i = new Intent();              i.setClass(context, DaemonService.class);              // 启动service               // 多次调用startService并不会启动多个service 而是会多次调用onStart              context.startService(i);          }      }  } 

    package com.arui.framework.android.daemonservice;  

    import android.app.Service;  
    import android.content.Intent;  
    import android.os.IBinder;  
    import android.util.Log;  

    public class DaemonService extends Service {  

        @Override  
        public IBinder onBind(Intent intent) {  
            return null;  
        }  

        @Override  
        public void onCreate() {  
            super.onCreate();  
            Log.v("=========", "***** DaemonService *****: onCreate");  
        }  

        @Override  
        public void onStart(Intent intent, int startId) {  
            Log.v("=========", "***** DaemonService *****: onStart");  
            // 这里可以做Service该做的事  
        }  
    }  

    <receiver   
        android:name=" com.arui.framework.android.daemonservice.BootBroadcast"  
        android:permission="android.permission.RECEIVE_BOOT_COMPLETED">  
        <intent-filter>  
            <action android:name="android.intent.action.BOOT_COMPLETED" />  
        </intent-filter>  
    </receiver>  
    <receiver   
        android:name=" com.arui.framework.android.daemonservice.Alarmreceiver" >  
        <intent-filter>  
            <action android:name="arui.alarm.action" />  
        </intent-filter>  
    </receiver>  
          <service  
              android:name=" com.arui.framework.android.daemonservice.DaemonService" >  
          </service>