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AlarmManager inside BroadcastReceiver when BOOT_COMPLETED

I have a "GroupsTaskAlarmChecker" service, which is called every 20 seconds by AlarmManager in onCreate of Groups.class this way:

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);

It works great. But I need to do this when booting the device. Then I know that I need to do AndroidManifest as follows:

<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>

and then mi broadcastReceiver:

 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);

    }
}

but inside this onReceive, I don’t know how I can do the same as before (with the intention and alarmManager to start the service every 20 seconds). The error in this line is:

 AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);

Is it possible that I cannot create an AlarmManager inside BroadcastReceiver?

I thank all of you, I am starting Android, and I need your help. Sorry for my English;)

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4

ALARM_SERVICE ReceiverBoot BroadcastReceiver.

Context.ALARM_SERVICE getSystemService (String).

+1

: onReceive , getSystemService ALARM_SERVICE. :

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);
        }
    }
}

, , MyReceiver MyService .

+3

, , , .

: "" AndroidManifest .

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

Second : with a class that extends the BroadcastReceiver class of the abstract class, you must determine if the intent was "BOOT_COMPLETED". If the condition is met, you can call a method from your class that has the whole structure for your alarm.

See the following snippet below.

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()");

    }

}
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in your onReceive:

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

   //start it again here

}
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