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POandroid google maps v2 get last know location and always start with network provider
 

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  1. POandroid google maps v2 get last know location and always start with network provider
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    <p>This Google Maps v2 api confuses me quite a bit. I have implemented it now in some way i would like to use it. I just have two small problems that i don't know how to go about.</p> <p>Sometimes I don't get a location when i start the app with gps enabled or it takes way too long to get one.</p> <p>So I would like it to always load with the internet location provider first to have a very fast location fix as well as always using the getlastknownlocation() first. Cant figure out how to go about it. </p> <p>Here my code:</p> <pre><code>public class MapViewMain extends FragmentActivity implements LocationListener, LocationSource { private GoogleMap mMap; private OnLocationChangedListener mListener; private LocationManager locationManager; final int RQS_GooglePlayServices = 1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mapviewmain); //start power button service Intent intent=new Intent("com.epicelements.spotnsave.START_SERVICE"); this.startService(intent); int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getBaseContext()); if(status!=ConnectionResult.SUCCESS){ // Google Play Services are not available Toast.makeText(this, "Google Service not found", Toast.LENGTH_LONG).show(); int requestCode = 10; Dialog dialog = GooglePlayServicesUtil.getErrorDialog(status, this, requestCode); dialog.show(); }else { // Google Play Services are available locationManager = (LocationManager) getSystemService(LOCATION_SERVICE); if(locationManager != null) { boolean gpsIsEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER); boolean networkIsEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); if (!gpsIsEnabled) { // Toast.makeText(this, "GPS signal not found", Toast.LENGTH_LONG).show(); PopIt("No GPS found", "Would you like to go to the settings to activate it?"); } if(gpsIsEnabled) { locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 5000L, 10F, this); } else if(networkIsEnabled) { locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 5000L, 10F, this); } else { //Show an error dialog that GPS is disabled... } } else { //Show some generic error dialog because something must have gone wrong with location manager. } setUpMapIfNeeded(); } } @Override public void onPause() { if(locationManager != null) { locationManager.removeUpdates(this); } super.onPause(); } @Override public void onResume() { super.onResume(); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); Criteria criteria = new Criteria(); locationManager.getBestProvider(criteria, true); if(mListener != null){ } setUpMapIfNeeded(); mMap.setMyLocationEnabled(true); // Enable the my-location layer if(locationManager != null) { mMap.setMyLocationEnabled(true); // Enable the my-location layer mMap.getUiSettings().setMyLocationButtonEnabled(false); } } private void setUpMapIfNeeded() { // Do a null check to confirm that we have not already instantiated the map. if (mMap == null) { // Try to obtain the map from the SupportMapFragment. mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap(); // Check if we were successful in obtaining the map. if (mMap != null) { setUpMap(); } //This is how you register the LocationSource mMap.setLocationSource(this); } } /** * This is where we can add markers or lines, add listeners or move the camera. * &lt;p&gt; * This should only be called once and when we are sure that {@link #mMap} is not null. */ private void setUpMap() { locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); mMap.setMyLocationEnabled(true); mMap.getUiSettings().setMyLocationButtonEnabled(false); mMap.setPadding(0,60,0,150); Criteria criteria = new Criteria(); criteria.setAccuracy(Criteria.ACCURACY_FINE); } @Override public void activate(OnLocationChangedListener listener) { mListener = listener; } @Override public void deactivate() { mListener = null; } @Override public void onLocationChanged(Location location) { if( mListener != null ) { mListener.onLocationChanged( location ); double lat = location.getLatitude(); double lng = location.getLongitude(); LatLng coordinate = new LatLng(lat, lng); //save coordinate SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0); // 0 - for private mode Editor editor = pref.edit(); editor.putFloat("lat", (float) location.getLatitude()); editor.putFloat("lng", (float) location.getLongitude()); editor.putFloat("accuracy", (float) location.getAccuracy()); editor.commit(); //marker stuff mMap.clear(); mMap.addMarker(new MarkerOptions() .position(coordinate) .icon(BitmapDescriptorFactory.fromResource(R.drawable.marker))); mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(coordinate, 16)); } } @Override public void onProviderDisabled(String provider) { // TODO Auto-generated method stub // Toast.makeText(this, "provider disabled", Toast.LENGTH_SHORT).show(); } @Override public void onProviderEnabled(String provider) { // TODO Auto-generated method stub // Toast.makeText(this, "provider enabled", Toast.LENGTH_SHORT).show(); } @Override public void onStatusChanged(String provider, int status, Bundle extras) { // TODO Auto-generated method stub // Toast.makeText(this, "status changed", Toast.LENGTH_SHORT).show(); } // Alarm Dialog if GPS not enabled public void PopIt( String title, String message ){ new AlertDialog.Builder(this) .setTitle( title ) .setMessage( message ) .setCancelable(false) .setPositiveButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { //do stuff onclick of YES //AlertDialog.dismiss(); } }) .setNegativeButton("Settings", new DialogInterface.OnClickListener() { public void onClick(DialogInterface arg0, int arg1) { //do stuff onclick of CANCEL Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); startActivity(intent); } }).show(); } } </code></pre>
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