android - 不断添加接近警报，如何使用 id 删除它们？

Question

我为每个 map 标记设置了我的 map 和接近警报，在这里我将纬度和经度以及地名传递给添加接近警报方法:

if(alerts==true)
{
addProximityAlert(l1, l2, place);
}

添加接近警报方法:

//The following sets up proximity alerts, getting a unique id for each one
private void addProximityAlert(Double latitude, Double longitude, String tit) {

    Intent intent = new Intent(PROX_ALERT_INTENT);
    intent.putExtra("name", tit);
    intent.putExtra("id", alertid);
    PendingIntent proximityIntent = PendingIntent.getBroadcast(this, alertid, intent, PendingIntent.FLAG_ONE_SHOT);
    lm.addProximityAlert(latitude, longitude, POINT_RADIUS, PROX_ALERT_EXPIRATION,proximityIntent );
    alertid++;


    IntentFilter filter = new IntentFilter(PROX_ALERT_INTENT );
    registerReceiver(new ProximityIntentReceiver(), filter);
}

以下是接近警报类:

public class ProximityIntentReceiver extends BroadcastReceiver {
    private static final int NOTIFICATION_ID = 1000;

    @SuppressWarnings("deprecation")
    @Override
    public void onReceive(Context context, Intent intent) {
       String key = LocationManager.KEY_PROXIMITY_ENTERING;
       Boolean entering = intent.getBooleanExtra(key, false);
       if (entering) {
                  Log.d(getClass().getSimpleName(), "entering");
           }else {
                  Log.d(getClass().getSimpleName(), "exiting");
           }
           NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

           Intent notificationIntent = new Intent(context, Map.class);
           PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, notificationIntent, 0);
           Notification notification = createNotification();


        notification.setLatestEventInfo(context, "Proximity Alert!", "You are approaching: " +intent.getStringExtra("name"), pendingIntent); 
        notificationManager.notify( intent.getIntExtra("id", -1), notification);


   }

    private Notification createNotification() {
           Notification notification = new Notification();
           notification.defaults |= Notification.DEFAULT_SOUND;
           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_LIGHTS; 
           notification.ledARGB = Color.CYAN;
           notification.ledOnMS = 15000;
           notification.ledOffMS = 15000;
           return notification;
     }
}

第一次设置 map 时，alertid 为 0，有四个 map 标记，设置了四个接近警报，工作正常。当离开 map 并返回时再次设置，alertid 重置为 0，但警报再次添加，因此 8 个警报消失，每次添加 4 个新警报。我想通过将 alertid 重置为 0，再次重新创建它们会覆盖以前的，因为它们有一个 id，但这显然没有发生。任何人都可以看到它们是如何构建的，并且可以告诉我如何确保它们只为每个设置创建一次吗？

Answer 1

我想您应该维护某种列表，在其中保存所有警报及其 Intent ，以避免将它们添加两次或多次。此外，根据您的使用场景，您可能应该在通知后删除它们:

lm.removeProximityAlert(PendingIntent intent)

但更有可能的是你多次注册了你的 BroadcastReceiver :)尝试只调用一次(而不是每次添加警报时):

registerReceiver(new ProximityIntentReceiver(), filter);