Android - 通知后删除接近警报

我想做的是拥有一个接近警报服务，当您步入半径范围内时（不停止服务），该服务仅触发一次通知。每次您步入半径内和每次您走出半径时，我的代码都会触发通知。我一直在尝试使用布尔值和removeProximityAlert，但没有成功。有任何想法吗？

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.location.LocationManager;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class ProximityService extends Service {

    private String PROX_ALERT_INTENT = "com.example.proximityalert";
    private BroadcastReceiver locationReminderReceiver;
    private LocationManager locationManager;
    private PendingIntent proximityIntent;

 @override
    public void onCreate() {
        locationReminderReceiver = new ProximityIntentReceiver();
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        double lat = 55.586568;
        double lng = 13.0459;
        float radius = 1000;
        long expiration = -1;

        IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT);
        registerReceiver(locationReminderReceiver, filter);

        Intent intent = new Intent(PROX_ALERT_INTENT);

        intent.putExtra("alert", "Test Zone");

        proximityIntent = PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_ONE_SHOT);

        locationManager.addProximityAlert(lat, lng, radius, expiration, proximityIntent);

    }

 @override
    public void onDestroy() {
        Toast.makeText(this, "Proximity Service Stopped", Toast.LENGTH_LONG).show();
        try {
            unregisterReceiver(locationReminderReceiver);
        } catch (IllegalArgumentException e) {
            Log.d("receiver", e.toString());
        }

    }

 @override
    public void onStart(Intent intent, int startid) {
        Toast.makeText(this, "Proximity Service Started", Toast.LENGTH_LONG).show();
    }

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



    public class ProximityIntentReceiver extends BroadcastReceiver {

        private static final int NOTIFICATION_ID = 1000;

     @suppressWarnings("deprecation")
     @override
        public void onReceive(Context arg0, Intent arg1) {

            String place = arg1.getExtras().getString("alert");

            NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            PendingIntent pendingIntent = PendingIntent.getActivity(arg0, 0, arg1, 0);

            Notification notification = createNotification();

            notification.setLatestEventInfo(arg0, "Entering Proximity!", "You are approaching a " + place + " marker.", pendingIntent);

            notificationManager.notify(NOTIFICATION_ID, notification);

            locationManager.removeProximityAlert(proximityIntent);

        }

        private Notification createNotification() {
            Notification notification = new Notification();

            notification.icon = R.drawable.ic_launcher;
            notification.when = System.currentTimeMillis();

            notification.flags |= Notification.FLAG_AUTO_CANCEL;
            notification.flags |= Notification.FLAG_SHOW_LIGHTS;

            notification.defaults |= Notification.DEFAULT_VIBRATE;
            notification.defaults |= Notification.DEFAULT_SOUND;

            return notification;
        }

    }
}

您应该在触发后删除接近警报，而不是再次重新创建它（将一些标志保存为变量，或者如果您使用 sqlite，则保存在数据库中）。

删除警报有点棘手，需要执行两个步骤，这两个步骤都会产生不（显然）“触发”的预期结果：

1. 取消注册您的接收器

   您可以保存一个接收器（或接收器数组）并unregister直接：

   for (ProximityReceiver proximityReceiverLocal:proximityReceiverArray) {
       context.unregisterReceiver(proximityReceiverLocal);
       proximityReceiverArray.remove(proximityReceiverLocal); // clear pile
   }
   

2. 删除警报

   注意：您无法将警报另存为对象，您必须重新创建警报PendingIntent并将其提交给其removeProximityAlert方法。待处理的意图必须具有相同的意图（即相同action name) 和相同的待处理意图 id：

   public void removeProximityAlert(int pendingIntentIdIn, String intentActionNameIn) {
       Intent intent = new Intent(intentActionNameIn);
       PendingIntent pendingIntent = PendingIntent.getBroadcast(context , pendingIntentIdIn, intent, 0);
       locationManager.removeProximityAlert(pendingIntent);
   }
   

如果您删除其中一个而不是另一个，您将实现进入 POI 半径时什么也不会发生的预期目标，但您将浪费宝贵的电池寿命和内存。