GPS location error

I am developing APPs that detect custom latitude, longitude and altitude, then fake this GPS location on the phone and show that I am at that location on google map. I have the required permission on my manifest file and have the corrected location enabled in developer settings.

LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//lm.clearTestProviderEnabled(mocLocationProvider);
lm.addTestProvider(mocLocationProvider, false, false, false, false, false, false, false, 0, 10);
lm.setTestProviderEnabled(mocLocationProvider, true);
mockLocation = new Location(mocLocationProvider); // a string
mockLocation.setLatitude(Integer.parseInt(latitude.getText().toString()));  // double 
mockLocation.setLongitude(Integer.parseInt(longitude.getText().toString())); 
mockLocation.setAltitude(Integer.parseInt(altitude.getText().toString())); 
mockLocation.setTime(System.currentTimeMillis()); 
lm.setTestProviderLocation( mocLocationProvider, mockLocation); 

      

        
        
        
      

    

But it looks like my GPS location doesn't change at all on google map, what's the problem?

Update: I just installed an app called "fake GPS location" on my phone and this app works great, but I still don't know what's wrong with my code, but I believe mine is the formal way to achieve this.

Update # 2: While some of these apps may work on my phone, I found some exceptions, http://www.cowlumbus.nl/forum/MockGpsProvider.zip , this app doesn't work on my phone. can anyone help me on this issue? millions of thanks! I don't get an error when setting the location every time.

Update # 3: I noticed that this app is quite old, so it doesn't work on 4.1. if so, how to do the same in the new version? my phone is samsung galaxy s3, hope this helps.

Update # 4: for your information, the code from the app in my update # 2:

package nl.cowlumbus.android.mockgps;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class MockGpsProviderActivity extends Activity implements LocationListener {
    public static final String LOG_TAG = "MockGpsProviderActivity"; 
    private static final String MOCK_GPS_PROVIDER_INDEX = "GpsMockProviderIndex";

    private MockGpsProvider mMockGpsProviderTask = null;
    private Integer mMockGpsProviderIndex = 0;

    /** Called when the activity is first created. */
    /* (non-Javadoc)
     * @see android.app.Activity#onCreate(android.os.Bundle)
     */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        /** Use saved instance state if necessary. */
        if(savedInstanceState instanceof Bundle) {
            /** Let find out where we were. */
            mMockGpsProviderIndex = savedInstanceState.getInt(MOCK_GPS_PROVIDER_INDEX, 0);
        }

        /** Setup GPS. */
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        if(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)){ 
            // use real GPS provider if enabled on the device
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        }
        else if(!locationManager.isProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER)) {
            // otherwise enable the mock GPS provider
            locationManager.addTestProvider(MockGpsProvider.GPS_MOCK_PROVIDER, false, false,
                    false, false, true, false, false, 0, 5);
            locationManager.setTestProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER, true);
        }  

        if(locationManager.isProviderEnabled(MockGpsProvider.GPS_MOCK_PROVIDER)) {
            locationManager.requestLocationUpdates(MockGpsProvider.GPS_MOCK_PROVIDER, 0, 0, this);

            /** Load mock GPS data from file and create mock GPS provider. */
            try {
                // create a list of Strings that can dynamically grow
                List<String> data = new ArrayList<String>();

                /** read a CSV file containing WGS84 coordinates from the 'assets' folder
                 * (The website http://www.gpsies.com offers downloadable tracks. Select
                 * a track and download it as a CSV file. Then add it to your assets folder.)
                 */         
                InputStream is = getAssets().open("mock_gps_data.csv");
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));

                // add each line in the file to the list
                String line = null;
                while ((line = reader.readLine()) != null) {
                    data.add(line);
                }

                // convert to a simple array so we can pass it to the AsyncTask
                String[] coordinates = new String[data.size()];
                data.toArray(coordinates);

                // create new AsyncTask and pass the list of GPS coordinates
                mMockGpsProviderTask = new MockGpsProvider();
                mMockGpsProviderTask.execute(coordinates);
            } 
            catch (Exception e) {}
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        // stop the mock GPS provider by calling the 'cancel(true)' method
        try {
            mMockGpsProviderTask.cancel(true);
            mMockGpsProviderTask = null;
        }
        catch (Exception e) {}

        // remove it from the location manager
        try {
            LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
            locationManager.removeTestProvider(MockGpsProvider.GPS_MOCK_PROVIDER);
        }
        catch (Exception e) {}
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        // store where we are before closing the app, so we can skip to the location right away when restarting
        savedInstanceState.putInt(MOCK_GPS_PROVIDER_INDEX, mMockGpsProviderIndex);
        super.onSaveInstanceState(savedInstanceState);
    }

    @Override
    public void onLocationChanged(Location location) {
        // show the received location in the view
        TextView view = (TextView) findViewById(R.id.text);
        view.setText( "index:" + mMockGpsProviderIndex
                + "\nlongitude:" + location.getLongitude() 
                + "\nlatitude:" + location.getLatitude() 
                + "\naltitude:" + location.getAltitude() );     
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub      
    }


    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub      
    }


    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub      
    }


    /** Define a mock GPS provider as an asynchronous task of this Activity. */
    private class MockGpsProvider extends AsyncTask<String, Integer, Void> {
        public static final String LOG_TAG = "GpsMockProvider";
        public static final String GPS_MOCK_PROVIDER = "GpsMockProvider";

        /** Keeps track of the currently processed coordinate. */
        public Integer index = 0;

        @Override
        protected Void doInBackground(String... data) {         
            // process data
            for (String str : data) {
                // skip data if needed (see the Activity savedInstanceState functionality)
                if(index < mMockGpsProviderIndex) {
                    index++;
                    continue;
                }               

                // let UI Thread know which coordinate we are processing
                publishProgress(index);

                // retrieve data from the current line of text
                Double latitude = null;
                Double longitude = null;
                Double altitude= null;
                try {
                    String[] parts = str.split(",");
                    latitude = Double.valueOf(parts[0]);
                    longitude = Double.valueOf(parts[1]);
                    altitude = Double.valueOf(parts[2]);
                }
                catch(NullPointerException e) { break; }        // no data available
                catch(Exception e) { continue; }                // empty or invalid line

                // translate to actual GPS location
                Location location = new Location(GPS_MOCK_PROVIDER);
                location.setLatitude(latitude);
                location.setLongitude(longitude);
                location.setAltitude(altitude);
                location.setTime(System.currentTimeMillis());
                location.setLatitude(latitude);
                location.setLongitude(longitude);
                location.setAccuracy(16F);
                location.setAltitude(0D);
                location.setTime(System.currentTimeMillis());
                location.setBearing(0F);

                // show debug message in log
                Log.d(LOG_TAG, location.toString());

                // provide the new location
                LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
                locationManager.setTestProviderLocation(GPS_MOCK_PROVIDER, location);

                // sleep for a while before providing next location
                try {
                    Thread.sleep(200);

                    // gracefully handle Thread interruption (important!)
                    if(Thread.currentThread().isInterrupted())
                        throw new InterruptedException("");
                } catch (InterruptedException e) {
                    break;
                }

                // keep track of processed locations
                index++;
            }

            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            Log.d(LOG_TAG, "onProgressUpdate():"+values[0]);
            mMockGpsProviderIndex = values[0];
        }
    }
}