AlarmManager为广播回收机器人android

Question

我一直在试图用AlarmManager重复一个动作，但是它一次正常工作，然后在20秒后不再重复。

public class CheckingService extends Service { 
    private static final String APP_TAG = "com.test"; 

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

    @Override 
    public int onStartCommand(final Intent intent, final int flags, 
           final int startId) { 
     Log.d(APP_TAG, "event received in service: " + new Date().toString()); 
     Toast.makeText(CheckingService.this, "TEST", Toast.LENGTH_SHORT).show(); 
     return Service.START_NOT_STICKY; 
    } 


} 

BroadcastReciever安排的Alaram：

public class SchedulerReciever extends BroadcastReceiver { 
    public SchedulerReciever() { 
    } 

    private static final String APP_TAG = "com.test"; 

    private static final int EXEC_INTERVAL = 20 * 10; 

    @Override 
    public void onReceive(final Context ctx, final Intent intent) { 
     Log.d(APP_TAG, "onReceive() called"); 
     AlarmManager alarmManager = (AlarmManager) ctx 
       .getSystemService(Context.ALARM_SERVICE); 
     Intent i = new Intent(ctx, MyBraoadCastReciever.class); // explicit 
     // intent 
     PendingIntent intentExecuted = PendingIntent.getBroadcast(ctx, 0, i, 
       PendingIntent.FLAG_CANCEL_CURRENT); 
     Calendar now = Calendar.getInstance(); 
     now.add(Calendar.SECOND, 2); 
     alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, 
       now.getTimeInMillis(), EXEC_INTERVAL, intentExecuted); 
    } 
} 

我的广播接收器加载的服务：

public class MyBraoadCastReciever extends BroadcastReceiver { 
    @Override 
    public void onReceive(Context context, Intent intent) { 


      Intent eventService = new Intent(context, CheckingService.class); 
      context.startService(eventService); 

    } 

} 

在过去我的AndroidManifest.xml这是使用启动

<receiver android:name=".SchedulerReciever" android:process=":my_process"> 
     <intent-filter > 
      <action android:name="android.intent.action.BOOT_COMPLETED" /> 
      <action android:name="android.intent.action.USER_PRESENT" /> 
     </intent-filter> 
    </receiver> 

    <service android:name=".CheckingService" android:process=":my_process" > 
    </service> 


    <receiver 
     android:name=".MyBraoadCastReciever" android:process=":my_process" 
     android:enabled="true" 
     android:exported="false" > 
    </receiver> 

Answer 1

您的EXEC_INTERVAL设置为200ms，而不是20 * 1000（20s）。

此外，如果您使用setRepeating，最好使用相对时间AlarmManager.ELAPSED_REALTIME_WAKEUP这是一个时间，因为手机开机和，而不是创建一个日历，你可以叫SystemClock.elapsedRealtime()或使用可选的2S SystemClock.elapsedRealtime() + 2000偏移。

所以，你的重复设置应该是这样的：

alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, 
       SystemClock.elapsedRealtime() + 2000, EXEC_INTERVAL, intentExecuted);