android AlarmManager not waking phone up

Question

I want an activity to be displayed at a certain time. For this, I am using AlarmManager. It works fine when the device is awake, but it doesn't wake it up if it's asleep.

My code for setting the alarm:

Calendar alarmTime = Calendar.getInstance();
alarmTime.set(Calendar.HOUR_OF_DAY, alarm.hour);
alarmTime.set(Calendar.MINUTE, alarm.minute);
alarmTime.set(Calendar.SECOND, 0);

if (alarmTime.before(now))
    alarmTime.add(Calendar.DAY_OF_MONTH, 1);

Intent intent = new Intent(ctxt, AlarmReceiver.class);
intent.putExtra("alarm", alarm);
PendingIntent sender = PendingIntent.getBroadcast(ctxt, alarm.id, intent, PendingIntent.FLAG_UPDATE_CURRENT);
alarmManager.set(AlarmManager.RTC_WAKEUP, alarmTime.getTimeInMillis(), sender);

My broadcast receiver:

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

Bundle bundle = intent.getExtras();
final Alarm alarm = (Alarm) bundle.getSerializable("alarm");

Intent newIntent;
if (alarm.type.equals("regular")) {
    newIntent = new Intent(context, RegularAlarmActivity.class);
} else if (alarm.type.equals("password")) {
    newIntent = new Intent(context, PasswordAlarmActivity.class);
} else if (alarm.type.equals("movement")) {
    newIntent = new Intent(context, MovementAlarmActivity.class);
} else {
    throw new Exception("Unknown alarm type");
}
    newIntent.putExtra("alarm", alarm);
    newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(newIntent);

} catch (Exception e) {
    Toast.makeText(context, "There was an error somewhere, but we still received an alarm", Toast.LENGTH_SHORT).show();
    Log.e("AlarmReceiver", Log.getStackTraceString(e));
}
}

This code doesn't wake the device on. However, when I turn it back again, they are displayed. I need to make them turn the screen on. Can you help me with this problem?

android AlarmManager not waking phone up

3 Answers