每天在特定时间使用 AlarmManager 触发通知时的错误

Question

在我的应用程序中，用户使用时间选择器设置警报，以通知他们何时使用该应用程序。当他们设置提醒时，它将每 24 小时通知用户一次。我已经使用 AlarmManager 和 Service 来解决这个问题。当我设置时间时，我每 24 小时收到一次通知，但有时我会一次又一次地随机收到通知。这是一个我无法调试的错误，我不知道问题出在哪里。

这就是我的做法：

设置提醒并取消它是我的代码： 我使用 AlarmManager 来设置时间。

private void setReminder(){
    Calendar calendar = Calendar.getInstance();
    Calendar currentCalendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
    calendar.set(Calendar.MINUTE, timePicker.getCurrentMinute());

    SimpleDateFormat sdf = new SimpleDateFormat(TIME_FORMAT, Locale.US);
    String time = sdf.format(calendar.getTime());
    SavingData.setReminder(time, true);

    long intendedTime = calendar.getTimeInMillis();
    long currentTime = currentCalendar.getTimeInMillis();

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

    if((intendedTime >= currentTime) == false){
        // This will set the alarm for the next day, if time is below intentedTime
        calendar.add(Calendar.DAY_OF_MONTH, 1);
        intendedTime = calendar.getTimeInMillis();
    }

    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, intendedTime, AlarmManager.INTERVAL_DAY, pendingIntent);

    Toast.makeText(this, "Alarm Scheduled!", Toast.LENGTH_LONG).show();
}

private void cancelId() {
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, timePicker.getCurrentHour());
    calendar.set(Calendar.MINUTE, timePicker.getCurrentMinute());

    // Time format to String
    SimpleDateFormat sdf = new SimpleDateFormat(TIME_FORMAT, Locale.US);
    String time = sdf.format(calendar.getTime());
    SavingData.setReminder(time, false);

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

    // If the alarm has been set, cancel it.
    if (alarmManager!= null) {
        alarmManager.cancel(pendingIntent);
        Toast.makeText(this, "Cancel Alarm!", Toast.LENGTH_SHORT).show();
    }
}

我使用广播接收器：

public class MyReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    Toast.makeText(context, "MyReceiver!", Toast.LENGTH_SHORT).show();
    Intent service = new Intent(context, MyService.class);
    context.startService(service);
}

}

下面是我的服务类。在我的服务类中，我使用通知管理器创建通知信息。

 public class MyService extends Service {
private static final int notificationID = 0;

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

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

@Override
@Deprecated
public void onStart(Intent intent, int startId) {
    // TODO Auto-generated method stub
    super.onStart(intent, startId);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);

    Intent notificationIntent = new Intent(this, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

    int icon = R.drawable.icon;
    String tickerText = "HELLO";
    long when = System.currentTimeMillis();
    String contentTitle = "How Are You";
    String contentText = "Time to use the App";
    // Define sound URI, the sound to be played when there's a notification
    Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

    Notification notification = new NotificationCompat.Builder(this)
    .setContentTitle(contentTitle)
    .setContentText(contentText)
    .setSmallIcon(icon)
    .setTicker(tickerText)
    .setWhen(when)
    .setContentIntent(pendingIntent)
    .setSound(soundUri)
    .build();

    notificationManager.notify(notificationID, notification);
    return super.onStartCommand(intent, flags, startId);
}

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

}

Answer 1

您的服务在死机时或在其他时间获得 Android 系统重启“空”意图，而您没有考虑这些意图。每当它收到意图时，您都会发送通知。来自文档：

intent 提供给 startService(Intent) 的 Intent，如给定。这可能 如果服务在其进程结束后重新启动，则为 null 离开了，它之前已经返回了任何东西，除了 START_STICKY_COMPATIBILITY。

如果您检查空意图或其他特定于警报意图的内容，您的问题应该会消失。