在重新激活WiFi/移动网络之前，Service中的Android位置侦听器无法正常工作 [英] Android Location listener in Service does not work until I reactivate WiFi/mobile network

问题描述

我的位置侦听器可以正常工作，可以毫无问题地收集数据.但是有时它不收集任何数据.我必须此时关闭并重新启动我的位置提供程序.重新启动可以解决该问题，但是，这可能并不是用户期望的最佳选择.

My location listener works normally, collects data without any problem. But sometimes it doesn't collect any data. I have to turn off and restart my location provider at this time. Restarting fixes the problem,however, it's probably not the best thing the user is expected to do.

当我使用GPS作为提供程序时，没有问题.

When I use GPS as provider, there is no problem.

位置侦听器在Service中工作.我不明白这个问题.是关于Android还是我的代码?

Location listener works in Service. I can't understand the problem. Is it about Android or my code?

提前谢谢.

推荐答案

您可以使用新的位置提供程序(FusedLocationProvider)，它将来自不同位置提供程序的信息组合在一起，因此，如果您的设备有可能获取位置，您将获得知道.当然，您应该为设备启用首选项以使用应用程序的位置信息.

You could use new location provider (FusedLocationProvider), which combines info from different location providers, so if your device has any possibility to obtain location, You'll get know it. Of course, You should enable in preferences for your device to use location info by apps.

检查developers.android.com以获取有关此提供程序的扩展信息.

Check developers.android.com for extended info about this provider.

这对我来说是很好的解决方案:

This is solution working fine for me:

public class FusedLocationListener implements GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener  {

    public interface LocationListener {
        public void onReceiveLocation(Location location);
    }

    private LocationListener mListener;

    public static final String TAG = "Fused";
    private LocationClient locationClient;
    private LocationRequest locationRequest;


    protected int minDistanceToUpdate = 1000;
    protected int minTimeToUpdate = 10*1000;

    protected Context mContext;


    @Override
    public void onConnected(Bundle bundle) {
        Log.d(TAG, "Connected");
        locationRequest = new LocationRequest();
        locationRequest.setSmallestDisplacement(1);
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(30000);
        locationRequest.setNumUpdates(1);
        locationClient.requestLocationUpdates(locationRequest, this);

    }

    @Override
    public void onDisconnected() {
        Log.d(TAG, "Disconnected");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.d(TAG, "Failed");
    }


    private static FusedLocationListener instance;

    public static synchronized FusedLocationListener getInstance(Context context, LocationListener listener){
        if (null==instance) {
            instance = new FusedLocationListener(context, listener);
        }
        return instance;
    }


    private FusedLocationListener(Context context, LocationListener listener){
        mContext = context;
        mListener = listener;
    }


    public void start(){

        Log.d(TAG, "Listener started");
        locationClient = new LocationClient(mContext,this,this);
        locationClient.connect();

    }


    @Override
    public void onLocationChanged(Location location) {
        Log.d(TAG, "Location received: " + location.getLatitude() + ";" + location.getLongitude());
        //notify listener with new location
        mListener.onReceiveLocation(location);
    }


    public void stop() {
        locationClient.removeLocationUpdates(this);
    }
}

用法:

public class MyActivity extends Activity implements FusedLocationListener.LocationListener {

 @Override
    public void onCreate(Bundle savedInstanceState) {

      FusedLocationListener locationListener FusedLocationListener.getInstance(getApplicationContext(), this);             

       locationListener.start();
   }

@Override
    public void onReceiveLocation(Location location) {
       //handle location here
    }

}

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