AlarmManager內廣播接收器時BOOT_COMPLETED

Question

我有一個服務「GroupsTaskAlarmChecker」是這種方式稱爲每20秒AlarmManager中的onCreate Groups.class活動：

int seconds = 20; 

      Intent myIntent = new Intent(Groups.this, GroupsTaskAlarmChecker.class); 
      pendingIntent = PendingIntent.getService(Groups.this, 0, myIntent, 0); 

      AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 

      Calendar calendar = Calendar.getInstance(); 
      calendar.setTimeInMillis(System.currentTimeMillis()); 
      calendar.add(Calendar.SECOND, 10); 
      alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), seconds * 1000, pendingIntent); 

這完美的作品。但是當設備啓動時我需要這樣做。 後來我知道我不得不作出AndroidManifest這樣的：

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> 
<receiver android:name=".ReceiverBoot"> 
     <intent-filter> 
      <action android:name="android.intent.action.BOOT_COMPLETED"> 
      <category android:name="android.intent.category.HOME"> 
     </category></action></intent-filter> 
    </receiver> 

然後英里廣播接收器是這樣的：

public class ReceiverBoot extends BroadcastReceiver { 
@Override 
public void onReceive(Context context, Intent intent) { 
    int seconds = 20; 

     Intent myIntent = new Intent(context, GroupsTaskAlarmChecker.class); 
     pendingIntent = PendingIntent.getService(context, 0, myIntent, 0); 

     AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 

     Calendar calendar = Calendar.getInstance(); 
     calendar.setTimeInMillis(System.currentTimeMillis()); 
     calendar.add(Calendar.SECOND, 10); 
     alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), seconds * 1000, pendingIntent); 

    } 
} 

但這的onReceive我不知道我該怎麼做，我以前做了同樣的內（意圖和alarmManager每20秒啓動一次服務）。 錯誤在這行：

AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE); 

是可能的，我不能讓裏面的BroadcastReceiver的AlarmManager？

我非常感謝你，我是一名Android成員，我需要你的幫助。對不起，我的英語;在你的onReceive）

Answer 1

ALARM_SERVICE既不在類ReceiverBoot也不在廣播接收器定義。

您應該引用Context.ALARM_SERVICE作爲getSystemService（String）的參數。

Answer 2

：

if ("android.intent.action.BOOT_COMPLETED".equals (intent.getAction())){ 

    //start it again here 

} 

Answer 3

總結上面的答案和評論：onReceive處理程序接收上下文，該上下文可用於訪問getSystemService和ALARM_SERVICE 。示例代碼：

public class MyReceiver extends BroadcastReceiver { 

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

     // Start periodic service. 
     Calendar cal = Calendar.getInstance(); 
     Intent srvIntent = new Intent(context, MyService.class); 
     PendingIntent pIntent = PendingIntent.getService(context, 0, srvIntent, 0); 
     // Use context argument to access service 
     AlarmManager alarm = 
         (AlarmManager)context.getSystemService(Context.ALARM_SERVICE); 

     // Repeat every 5 seconds 
     alarm.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 
           5000, pIntent); 
     } 
    } 
} 

創建一個新的類與此代碼，當然變化MyReceiver和爲MyService在你執行的名字。

Answer 4

這裏有一點貢獻，我相信這可以爲實現這個問題的目標添加更完整的視角。

第一個：在您的應用程序中配置AndroidManifest內的「接收器」。

<receiver 
    android:name=".AlarmBroadcastReceiver" 
    android:enabled="true"> 
    <intent-filter> 
     <action android:name="android.intent.action.BOOT_COMPLETED"/> 
    </intent-filter> 
</receiver> 

二：與擴展抽象類廣播接收器一類，你應該確定意向行動是「BOOT_COMPLETED」。如果條件滿足，您可以從您的班級調用一種方法，該方法將所有構造都報告給您的報警。

請參閱下面的代碼段。

public class AlarmBroadcastReceiver extends BroadcastReceiver { 

    String TAG = "ALARMS"; 
    String CLASS = this.getClass().getSimpleName() + ": "; 

    Context alarmContext; 

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

     Log.d(TAG, CLASS + "[START] onReceive()... "); 

     alarmContext = context; 

     if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) { 
      Log.d(TAG, CLASS + "BOOT_COMPLETED action has been received."); 
      setAlarmOnBoot(); 
     } 

      Log.d(TAG, CLASS + "[END] onReceive()... "); 

    } 

    public void setAlarmOnBoot() { 

     Log.d(TAG, CLASS + "[START] - setAlarmOnBoot()"); 

     final long beginAt = SystemClock.elapsedRealtime() + 60 * 1000; 
     final long interval = 300000; // 5 minutes 

     try { 
      AlarmManager alarm = (AlarmManager) alarmContext.getSystemService(Context.ALARM_SERVICE); 
      Intent intent   = new Intent(alarmContext, AlarmBroadcastReceiver.class); 
      PendingIntent pIntent = PendingIntent.getService(alarmContext, 0, intent, 0); 
      alarm.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, beginAt, interval, pIntent); 
      Log.d(TAG, CLASS + "the Alarm has been configured successfully (5 minutes) of interval."); 
     } catch (Exception e) { 
      Log.d(TAG, CLASS + "an exception has ocurred while setting the Alarm..."); 
      e.printStackTrace(); 
     } 

     Log.d(TAG, CLASS + "[END] - setAlarmOnBoot()"); 

    } 

}