android - 警报管理器不工作

Question

我需要在 10 秒后启动 Activity AlarmReceiver(例如)。我需要在不运行应用程序的情况下激活它。但是无论应用程序是否运行，AlarmReceiver 都不会被调用。有什么建议吗？

Intent intent = new Intent(this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 111, intent, 0);
AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);

//alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() 
                                          //+ (10 * 1000), pendingIntent);
Toast.makeText(this, "Alarm set", Toast.LENGTH_LONG).show();

Answer 1

public class AlarmReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
          String message = "Hellooo, alrm worked ----";
          Toast.makeText(context, message, Toast.LENGTH_SHORT).show();
          Intent intent2 = new Intent(context, TripNotification.class); 
          intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          context.startActivity(intent2);
    }

    public void setAlarm(Context context){
        Log.d("Carbon","Alrm SET !!");

        // get a Calendar object with current time
         Calendar cal = Calendar.getInstance();
         // add 30 seconds to the calendar object
         cal.add(Calendar.SECOND, 30);
         Intent intent = new Intent(context, AlarmReceiver.class);
         PendingIntent sender = PendingIntent.getBroadcast(context, 192837, intent, PendingIntent.FLAG_UPDATE_CURRENT);

         // Get the AlarmManager service
         AlarmManager am = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
         am.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), sender);
    }
}

这是我设法开始工作的最终代码。你需要添加

 <receiver  android:process=":remote" android:name="AlarmReceiver"></receiver>

就在 </application> 上方 list 文件中的标记。

这将设置在调用方法 SetAlarm() 后 30 秒内触发警报