android - 一部のデバイスで場所を特定できないのはなぜですか?

Question

良い一日。私は LocationListener についてすべて学び、さまざまな例を調べましたが、さまざまなデバイスでいくつかのテストを行うたびに私は動揺します。だから、私はあなたに助けを求めます。トラブルデバイス: Samsung Galaxy S1、Galaxy fit、htc one v、HTC Incredible S、Pipo Smart S1 など。NoProblem デバイス: Samsung Galaxy S3。ヘルプ ：）

現在の実装:

public class LocationListener implements android.location.LocationListener
{
    // Current myLocation
    private LocationManager mLocationManager = null;
    private boolean mLocationEnabled = false;
    private volatile Location mLocation;
    private LocationListener locationListener;
    private volatile boolean locationChanged = false;
    //interface implementation Runnable which called UI methods
    private LocationRunnable runnable = null;


    public LocationListener(Context context, LocationRunnable runnable)
    {
        this.runnable = runnable;
        mLocationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        mLocation = null;
    }

    public boolean enableMyLocation()
    {
        mLocationEnabled = true;
        List<String> mProviders = mLocationManager.getProviders(true);

        if (mProviders.size() > 0)
        {
            locationListener = this;
            mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 1, locationListener);

        }

        //start background process to count 30 secs
        new TimeOut().execute();
        return false;
    }

    public void disabledMyLocation()
    {
        if (mLocationManager != null)
            mLocationManager.removeUpdates(this);
    }


    private class TimeOut extends AsyncTask<Void, Void, Void>
    {

        @Override
        protected Void doInBackground(Void... params)
        {
                long sec = System.currentTimeMillis();
               //here we count 30 secs and if method onLocationChanged wasn't run before, start runnable here
                while (!locationChanged && System.currentTimeMillis() - sec < 30 * 1000)
                {}
            return null;
        }

        @Override
        protected void onPostExecute(Void p)
        {
            if (!locationChanged)
            {
                runnable.setLocation(mLocation);
                runnable.run();
            }

        //cancel update
            mLocationManager.removeUpdates(locationListener);
        }
    }




    public void onLocationChanged(Location location)
    {
     //if location is OK so call UI changing
        mLocation = location;
        locationChanged = true;
        runnable.setLocation(location);
        runnable.run();
        //cancel update
        mLocationManager.removeUpdates(locationListener);
    }

}