AlarmManager没有取消Android

Question

我想取消之前注册过的alarmmanager。我正在注册我的alarmmanager如下：

Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
PendingIntent pendingIntent = PendingIntent.getService(SetProfileOnlineActivity.this, 1545,
                                                            i, 0);
alarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 5000, pendingIntent);

我试图使用以下代码取消它：

Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
PendingIntent p = PendingIntent.getService(SetProfileOnlineActivity.this, 1545, i, 0);
alarmManager.cancel(p);

但它并没有取消。为了调试它，我把这个代码放在try catch块中，但是它不能捕获任何错误。请让我知道它发生的原因，我该如何解决？

UPDATE

可能是重复但我无法理解在this问题中给出的答案和我尝试过的答案之间有什么区别。所以，这不是重复的问题，因为我已经完成了this回答中建议的事情。

UPDATE 1

完整代码

我正在使用以下代码块开始我的服务：

AlertDialog.Builder builder = new AlertDialog.Builder(SetProfileOnlineActivity.this);
                                    builder.setTitle("Need More Accuracy?");
                                    builder.setMessage("Hello user, you have set too small area for geofence. May be it will " +
                                            "perform action with delay in time. If you want to get more accuracy in action" +
                                            " then press \"YES\" button. More accuracy will consume more bettery then normal.");
                                    builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                            startService(new Intent(SetProfileOnlineActivity.this, GpsPingService.class));


                                            try {

                                                Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
                                                PendingIntent pendingIntent = PendingIntent.getService(SetProfileOnlineActivity.this, 1545,
                                                        i, PendingIntent.FLAG_UPDATE_CURRENT);
                                                AlarmManager alarmManager = (AlarmManager)getSystemService(SetProfileOnlineActivity.ALARM_SERVICE);

                                                alarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 5000, pendingIntent);
                                                Log.e("JK-->> ", "Alarmmanager setted!");
                                            } catch (Exception e) {
                                                Log.e("JK-->>", "Error gpsping register -->> " + e.toString());
                                            }

                                            dialog.dismiss();
                                        }
                                    });
                                    builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                                        @Override
                                        public void onClick(DialogInterface dialog, int which) {
                                            try {
                                                Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
                                                PendingIntent p = PendingIntent.getService(SetProfileOnlineActivity.this, 1545, i, PendingIntent.FLAG_UPDATE_CURRENT);
                                                AlarmManager alarmManager = (AlarmManager)getSystemService(SetProfileOnlineActivity.ALARM_SERVICE);
                                                alarmManager.cancel(p);
                                                stopService(i);

                                            } catch (Exception e) {
                                                Log.e("JK-->>", "Cancel alarmmanager error-->> " + e.getMessage().toString());
                                            }
                                            dialog.dismiss();
                                        }
                                    });
                                    AlertDialog alertDialog = builder.create();
                                    alertDialog.show();

服务类：

public class GpsPingService extends Service {

    LocationManager locationManager;
    LocationListener locationListener;
    FusedLocationProviderClient fusedLocationProviderClient;
    LocationRequest locationRequest;

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.e("JK-->>", "Gpsping Service stopped!");
    }

    @Override
    public void onCreate() {
        Log.e("JK-->>", "Gpsping Service started!");
    }

    public GpsPingService() {
        Log.e("JK-->>", "constructor");
    }

    @SuppressLint("MissingPermission")
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.e("JK-->>", "Gpsping Service onstartcommand!");
        try {


            Intent i = new Intent(this, GpsPingService.class);
            PendingIntent pendingIntent = PendingIntent.getService(this, 1545,
                    i, 0);

            AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 5000, pendingIntent);


            locationRequest = new LocationRequest()
                    .setInterval(1000)
                    .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
                    .setFastestInterval(1000);

            LocationCallback locationCallback = new LocationCallback() {
                @Override
                public void onLocationResult(LocationResult locationResult) {
                    Log.e("JK-->>", "location updated by gpsping service-->> " + locationResult.getLastLocation().getLatitude() +
                            " " + locationResult.getLastLocation().getLongitude());
                    Toast.makeText(getApplicationContext(), "Location changed!", Toast.LENGTH_SHORT).show();
                }
            };

            fusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(getApplicationContext());
            fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());

        } catch (Exception e) {
            Log.e("JK-->>Gpsping-->> ", e.getMessage());
        }
        return START_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

Answer 1

尝试创建一个不同的AlarmManager;

Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
PendingIntent pendingIntent = PendingIntent.getService(SetProfileOnlineActivity.this, 1545,i, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC, System.currentTimeMillis() + 5000, pendingIntent);

当你取消它时，你这样做：

Intent i = new Intent(SetProfileOnlineActivity.this, GpsPingService.class);
PendingIntent p = PendingIntent.getService(SetProfileOnlineActivity.this, 1545, i, 0);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(p);

这样做对我有用。

Answer 2

我认为你向PendingIntent提供了一个错误的旗帜。根据documentation

可以是FLAG_ONE_SHOT，FLAG_NO_CREATE，FLAG_CANCEL_CURRENT，FLAG_UPDATE_CURRENT，FLAG_IMMUTABLE或Intent.fillIn（）支持的任何标志，以控制实际发送时可以提供的意图的哪些未指定部分。

创建闹钟时尝试使用PendingIntent.FLAG_UPDATE_CURRENT，然后取消它。

PendingIntent.getService(SetProfileOnlineActivity.this, 1545, i, PendingIntent.FLAG_UPDATE_CURRENT);

我也看到你从服务本身获得了上下文。检查null的上下文，或者可能没有运行。