Question

我是新手。我写了一个实现服务并使用gps的类，但是位置总是为null。所有需要的权限都是写的，服务通常是开始的，我可以绑定它，但是检索的位置总是为null，它永远不会进入 onLocationChanged（位置位置）。请帮忙吗？

public class GPSService extends Service {


    private static final String TAG = "GPS_SERVICE";
    private LocationManager mLocationManager = null;
    private static final int LOCATION_INTERVAL = 1000;
    private static final float LOCATION_DISTANCE = 10f;
    Location currentLocation;

    private class LocationListener implements android.location.LocationListener{

        Location mLastLocation;

        public LocationListener(String provider)
        {
            Log.e(TAG, "LocationListener " + provider);
            mLastLocation = new Location(provider);
        }

        public void onLocationChanged(Location location)
        {
            Log.e(TAG, "onLocationChanged: " + location);
            if (location != null){
                mLastLocation.set(location);
                currentLocation = mLastLocation;                
            }

        }

        public void onProviderDisabled(String provider)
        {
            Log.e(TAG, "onProviderDisabled: " + provider);            
        }

        public void onProviderEnabled(String provider)
        {
            Log.e(TAG, "onProviderEnabled: " + provider);
        }

        public void onStatusChanged(String provider, int status, Bundle extras)
        {
            Log.e(TAG, "onStatusChanged: " + provider);
        }

    } 


    LocationListener[] mLocationListeners = new LocationListener[] {
            new LocationListener(LocationManager.GPS_PROVIDER),
            new LocationListener(LocationManager.NETWORK_PROVIDER)
    };


    private IBinder mBinder = new GPSServiceBinder();

    public class GPSServiceBinder extends Binder {
        public GPSService getServerInstance() {
            return GPSService.this;
        }
    }

    public int onStartCommand(Intent intent, int flags, int startId)
    {
        Log.e(TAG, "onStartCommand");
        super.onStartCommand(intent, flags, startId);       
        return START_STICKY;
    }

    public IBinder onBind(Intent intent) {
        return mBinder;
    }

    int minTime = 6000;
    float minDistance = 15;

    public void onCreate()
    {
        Log.e(TAG, "onCreate");
        initializeLocationManager();

        try {
            mLocationManager.requestLocationUpdates(
                    LocationManager.NETWORK_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[1]);
        } catch (java.lang.SecurityException ex) {
            Log.i(TAG, "fail to request location update, ignore", ex);
        } catch (IllegalArgumentException ex) {
            Log.d(TAG, "network provider does not exist, " + ex.getMessage());
        }
        try {
            mLocationManager.requestLocationUpdates(
                    LocationManager.GPS_PROVIDER, LOCATION_INTERVAL, LOCATION_DISTANCE,
                    mLocationListeners[0]);
        } catch (java.lang.SecurityException ex) {
            Log.i(TAG, "fail to request location update, ignore", ex);
        } catch (IllegalArgumentException ex) {
            Log.d(TAG, "gps provider does not exist " + ex.getMessage());
        }
    }


    public Location getLocation()
    {   
        return currentLocation;
    }


    public void onDestroy()
    {
        Log.e(TAG, "onDestroy");
        super.onDestroy();
        if (mLocationManager != null) {
            for (int i = 0; i < mLocationListeners.length; i++) {
                try {
                    mLocationManager.removeUpdates(mLocationListeners[i]);
                } catch (Exception ex) {
                    Log.i(TAG, "fail to remove location listners, ignore", ex);
                }
            }
        }
    } 


    private void initializeLocationManager() {
        Log.e(TAG, "initializeLocationManager");
        if (mLocationManager == null) {
            mLocationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
        }
    }
}

Answer 1

如果您使用的是2.3版Android的模拟器，那么就有一个错误。我刚刚面对它。在这种情况下，您可以安装2.3 x86模拟器。它工作正常。

Gps服务 - 无法检索位置

1 个答案: