AlarmManager 一次警报不触发

Question

我想用以下内容触发一次性警报，这基本上是 https://developer.android.com/training/scheduling/alarms.html 的复制（第二个 ELAPSED_REALTIME_WAKEUP 示例）。

这是里面的 public static class PlaceholderFragment extends Fragment implements View.OnClickListener:

    @Override 
    public void onClick(View v) {
        Intent intent;
        intent = new Intent(this.getActivity(), MuteReceiver.class);
        AlarmManager alm = (AlarmManager)(this.getActivity().getSystemService(Context.ALARM_SERVICE));
        PendingIntent alarmIntent = PendingIntent.getBroadcast(getActivity(), 0, intent, 0);
        alm.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,
            SystemClock.elapsedRealtime() + 60*1000, 
            alarmIntent);
        Log.d("MainActivity", "alarm set");
    }

public class MuteReceiver extends BroadcastReceiver 是这样的：

public MuteReceiver() {
    Log.d("MuteReceiver", "constructed");
}

@Override
public void onReceive(Context context, Intent intent) {
    final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
    boolean started = prefs.getBoolean(MuteService.STARTED, false);
    Log.d("MuteReceiver", "Started=" + started);
}

我按下了 Fragment 中的按钮，看到了日志消息 "alarm set"，但是一分钟后（甚至更晚），仍然没有关于构造 MuteReceiver 或启动 MuteReceiver 的日志（在 onReceive 中）

Answer 1

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AlarmManager 一次警报不触发

AlarmManager one time alarm does not fire

android

alarmmanager