Android Alarmmanager 通知在长时间空闲后不出现

Question

几周来我一直在努力解决这个问题。基本问题是，在设备长时间（8 小时）闲置后，计划的通知将不会激活。在测试中，我一直在使用两台设备，一台 LG Optimus Elite 和一台三星 Galaxy Note S4。在 Optimus Elite 上，通知会在设备被唤醒时发生，但在 Note 上，通知会完全消失并且永远不会显示。整个系统在设备处于唤醒状态或短时间不活动后工作。

public class AlarmReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    try {
        WakeLocker.acquire(context);
        Bundle bundle = intent.getExtras();
        Intent i = new Intent(context, AlarmService.class);
        i.putExtra("name", bundle.getString("name"));
        i.putExtra("alarm", bundle.getString("alarm"));
        context.startService(i);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

**public class AlarmService extends Service {

LocalBroadcastManager broadcaster;
static final public String REFRESH_INTENT = "rf";

@Override
public IBinder onBind(Intent arg0)
{
    // TODO Auto-generated method stub
    return null;
}

public void handleIntent(Intent intent){
    broadcaster = LocalBroadcastManager.getInstance(this);
    Bundle bundle = intent.getExtras();
    String message = bundle.getString("alarm");
    if(message.equals("dosesTakenResetAlarm")){
        dailyReset(getApplicationContext());
    }
    else if(message.equals("scheduledReminder")){
        scheduledReminder(bundle.getInt("code", 0), bundle.getString("name"), getApplicationContext());
    }
    WakeLocker.release();
}

public void onStart(Intent intent, int startId){
    handleIntent(intent);
}

public int onStartCommand(Intent intent, int flags, int startId){
    handleIntent(intent);
    return START_NOT_STICKY;
}

@Override
public void onDestroy()
{
    // TODO Auto-generated method stub
    super.onDestroy();
    WakeLocker.release();
}

private void dailyReset(Context context){
    FileWriter fw = new FileWriter(context);
    AlarmCreator ac = new AlarmCreator();
    fw.fp.onloadString(fw.readFromFile());
    int medNum = 0;
    while(fw.fp.hasNext()){
        SaveData mv = fw.readEntry(medNum);
        fw.fp.onloadMedString(mv.data);
        String name = fw.fp.nextMedVariable();
        String doses = fw.fp.nextMedVariable();
        String frequency = fw.fp.nextMedVariable();
        String frequencyS = fw.fp.nextMedVariable();
        String reminders = fw.fp.nextMedVariable();
        String dosesT = fw.fp.nextMedVariable();
        frequencyS = ""+(Integer.parseInt(frequencyS)-1);
        if(Integer.parseInt(frequencyS) < 0){
            frequencyS = ""+(Integer.parseInt(frequency)-1);
        }
        fw.replaceEntry(fw.fp.buildMedSaveString(name, doses, frequency, frequencyS, reminders, "0"), mv.position1, mv.position2);
        if(frequencyS.equals("0")){
            fw.fp.onloadReminderString(reminders);
            int reminderNum = 0;
            while(fw.fp.hasNextReminder()){
                ReminderData temp = fw.fp.nextReminder();
                if(temp.half.equals("1")){
                    temp.hour = ""+(Integer.parseInt(temp.hour)+12);
                }
                ac.setAlarm(Integer.parseInt(temp.hour), Integer.parseInt(temp.minute), 0, ac.buildAlarmCode(medNum, reminderNum), name);
                reminderNum++;
            }
        }
        medNum++;
        fw.fp.nextMedication();
    }

    Intent intent = new Intent(REFRESH_INTENT);
    broadcaster.sendBroadcast(intent);
}

private void scheduledReminder(int code, String n, Context context){
    Intent intent = new Intent(context, Main.class);
    PendingIntent pIntent = PendingIntent.getActivity(context, 101, intent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder mBuilder =
            new NotificationCompat.Builder(context)
                    .setSmallIcon(R.drawable.deleted)
                    .setContentTitle("Pillbud Reminder")
                    .setContentText("Take a dosage of "+n+".");
    mBuilder.setDefaults(Notification.DEFAULT_ALL);
    mBuilder.setContentIntent(pIntent);
    mBuilder.setVisibility(NotificationCompat.VISIBILITY_PUBLIC);
    NotificationManager mNotifyMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    mNotifyMgr.notify(code, mBuilder.build());
}

}**

此外，如果有人对如何诱导这种睡眠状态有任何建议，那将对测试非常有帮助。

Answer 1

您需要获取唤醒锁。看看 WakefulBroadcastReceiver, or CommonsWare Guy's WakefulIntentService

关于让设备休眠，如果你有root，那么adb shell进去，获取root然后输入：

  echo standby > /sys/power/state

有更多关于电源状态的信息here

如果您没有 root，那么在 PowerManager、goToSleep 上调用应该可以。您需要授予调用应用 DEVICE_POWER 权限

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