LocationManager.removeUpdates(listener) 不删除位置监听器答案

【问题标题】：LocationManager.removeUpdates(listener) not removing location listenerLocationManager.removeUpdates(listener) 不删除位置监听器
【发布时间】：2012-09-17 11:15:30
【问题描述】：

我的应用场景是我想跟踪员工的位置。我有一个广播接收器，它监听设备启动广播并注册一个警报管理器。当警报管理器滴答作响时，它会注册两个位置侦听器，一个用于侦听 gps，另一个用于网络。我希望当我在 onLocationChange() 方法中获得第一次位置更新时，保存位置并取消注册该位置侦听器，以便当警报管理器再次滴答声时，它不会重复。要取消注册，我将位置侦听器作为静态对象在 onLocationChange() 中访问它们。但我发现它并没有删除位置监听器。这是我的代码示例：

 public class BootTimeServiceActivator extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Calendar calendar = Calendar.getInstance();
        AlarmManager am = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
        Intent mIntent = new Intent(context, MyBroadCastReceiver.class);
        PendingIntent mPendingIntent = PendingIntent.getBroadcast(context, 0, mIntent, PendingIntent.FLAG_CANCEL_CURRENT);
        am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), 20 * 60 * 1000, mPendingIntent);


    }

    }

//..........

    public class MyBroadCastReceiver extends BroadcastReceiver{

    public static LocationManager locationManager;
    public static MyLocationListener networkLocationListener;
    public static MyLocationListener gpsLocationListener;



    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Toast.makeText(context, "Alarm has been called...", Toast.LENGTH_SHORT).show();
        initLocationListeners(context);
        registerLocationListeners();

    }

    public void initLocationListeners(Context context) {
        locationManager = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
        networkLocationListener = new MyLocationListener(context);
        gpsLocationListener = new MyLocationListener(context);

    }

    public void registerLocationListeners() {
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 100, 0, gpsLocationListener);
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 100, 0, gpsLocationListener);

    }

}

\\.....

    public class MyLocationListener implements LocationListener {

    Context context;

    public MyLocationListener(Context context) {
        this.context = context;
    }

    @Override
    public void onLocationChanged(Location location) {
        if(location != null) {
            SDCardService sdService = new SDCardService(context);
            try {
                sdService.logToDB(location);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            Log.d("provider",location.getProvider());
            if(location.getProvider().equals(LocationManager.GPS_PROVIDER)) {
                MyBroadCastReceiver.locationManager.removeUpdates(MyBroadCastReceiver.gpsLocationListener);
            }
            else if(location.getProvider().equals(LocationManager.NETWORK_PROVIDER)) {
                MyBroadCastReceiver.locationManager.removeUpdates(MyBroadCastReceiver.networkLocationListener);
            }



        }


    }

谁能指导我哪里错了？

【问题讨论】：

标签： android locationlistener

【解决方案1】：

试试这个..

lmNetwork.removeUpdates(networkLocationListener);
lmGps.removeUpdates(gpsLocationListener);

【讨论】：

【解决方案2】：

啊...我有一个拼写错误。实际上，在 MyBroadCastREciever 类中，我将 gpsListener 注册了两次：

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 
    100, 0, 
    gpsLocationListener);

locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 
    100, 0, 
    networkLocationListener); //previously was gpsLocationListener again. Wrong.

那是你的网络监听器没有被删除。

【讨论】：

那你做了什么修改？就像您删除网络侦听器一样，您将无法获得网络更新。

【解决方案3】：

您可以使用内部类来执行此操作并删除监听器 onPause() ：

        @Override
        protected void onPause() {
                super.onPause();
                GPSlocationManager.removeUpdates(GPSLocationListener);
                CellLOcationManager.removeUpdates(NetworkLocationListener);
        }

        private void SetLocationManager() {
                GPSlocationManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
                CellLOcationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                NetworkLocationListener = new MyNetworkLocationListener();
                GPSLocationListener = new MyGPSLocationListener();
                GPSlocationManager.requestLocationUpdates("gps", 5000, 1, GPSLocationListener);
                CellLOcationManager.requestLocationUpdates("network", 10000, 1, NetworkLocationListener);
        }

        private class MyNetworkLocationListener implements LocationListener {

                @Override
                public void onLocationChanged(Location location) {

                }

                @Override
                public void onStatusChanged(String s, int i, Bundle bundle) {
                }

                @Override
                public void onProviderEnabled(String s) {
                }

                @Override
                public void onProviderDisabled(String s) {
                }

        }

【讨论】：