无法将 AlarmManager 设置为重复一个

Question

我正在尝试将闹钟设置为每 30 秒唤醒一次，但它不起作用。它在开始时只执行 1 次。我不确定我是否必须使用 setInexactRepeating 或 setRepeating 或 setExact（并回忆一下方法）；如果我应该使用 ELAPSED_REALTIME_WAKEUP 或 RTC_WAKEUP.

public void onClick(View view) {
    alarmMethod(this);
}

public static void alarmMethod(Context context) {
    Intent myIntent = new Intent(context, LocalWordService.class);
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(context.ALARM_SERVICE);
    PendingIntent pendingIntent = PendingIntent.getService(context, 0 ,myIntent, 0);

    Calendar cur_cal = new GregorianCalendar();
    cur_cal.setTimeInMillis(System.currentTimeMillis());//set the current time and date for this calendar

    Calendar cal = Calendar.getInstance();        

    cal.set(Calendar.MINUTE, cur_cal.get(Calendar.MINUTE) + 1);
    cal.set(Calendar.SECOND, 30);        

    alarmManager.cancel(pendingIntent);
    alarmManager.setInexactRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 1000 * 30, pendingIntent);
    Log.d("MainActivity", "Alarm at = " + cal.getTime().toString());
    Toast.makeText(context, "Start Alarm", Toast.LENGTH_SHORT).show();

}

我的服务是：

public class LocalWordService extends Service {

@Override
public IBinder onBind(Intent arg0) {
    Toast.makeText(getApplicationContext(), "onBind", Toast.LENGTH_SHORT).show();
    return null;
}

@Override
public void onCreate(){
    Toast.makeText(getApplicationContext(), "WAKE UP!!!", Toast.LENGTH_SHORT).show();
    Log.d("Service", "ActualTime : " + DateFormat.getDateInstance().getCalendar().getTime().toString());
    //MainActivity.alarmMethod(getApplicationContext());
}

}

PS：我正在使用 Android Lollipop 设备进行测试。 (5.0.2)

Answer 1

put your code from onCreate() to onStartCommand()

因为我认为您在 onReceive() 中使用了 startService() 的警报接收器。并且它第一次创建您的服务并调用 onCreate() 但是在调用 startService() 30 秒后，服务已经创建，因此它调用 onStartCommand().

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
   Toast.makeText(getApplicationContext(), "WAKE UP!!!", Toast.LENGTH_SHORT).show();
    Log.d("Service", "ActualTime : " + DateFormat.getDateInstance().getCalendar().getTime().toString());
    //MainActivity.alarmMethod(getApplicationContext());
    return super.onStartCommand(intent,flags,startId);
}

无法将 AlarmManager 设置为重复一个

Can't set AlarmManager to repeating one

android

service

alarmmanager

android-5.0-lollipop