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POAndroid, adding overlay icon to onLocationChange causing crash
 

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  1. POAndroid, adding overlay icon to onLocationChange causing crash
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    <p>following code , it crashes when I uncomment the 'list etc and add overlay when I add the overlay to list it crashes. I can add a single overlay icon in the 'oncreate and it doesn't crash, but adding it to the 'onlocationchanged' it crashes</p> <pre><code> public class MainActivity extends MapActivity implements LocationListener { MyLocationOverlay myLocationOverlay; public MapView mapView; MapController mc; OverlayItem overlayitem; List&lt;Overlay&gt; mapOverlays; HelloItemizedOverlay itemizedoverlay; GeoPoint myLocationGeoPoint; private MockGpsProvider mMockGpsProviderTask = null; //mMockGpsProviderTask = new MockGpsProvider(); /* This method is called when use position will get changed */ public void onLocationChanged(Location location) { GeoPoint myLocationGeoPoint = new GeoPoint((int)(location.getLatitude() * 1e6) , (int)(location.getLongitude() * 1e6)); // Toast.makeText(this, "changinglocation", Toast.LENGTH_SHORT).show(); String message = String.format( "New Location \n Longitude: %1$s \n Latitude: %2$s", (int)(location.getLongitude()), (int)(location.getLatitude()) ); Toast.makeText(this, message, Toast.LENGTH_LONG).show(); // mc.setCenter(myLocationGeoPoint); mc.animateTo(myLocationGeoPoint); // mc.setZoom(11); //} // mapOverlays = mapView.getOverlays(); // Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker); overlayitem = new OverlayItem(myLocationGeoPoint, "Hola, Mundo!", "I'm in Mexico City!"); itemizedoverlay.addOverlay(overlayitem); mapOverlays.add(itemizedoverlay); } public void onProviderDisabled(String provider) { Toast.makeText(this, "No mock data mofo", Toast.LENGTH_SHORT).show(); } public void onProviderEnabled(String provider) { } public void onStatusChanged(String provider, int status, Bundle extras) { } int test() { int i1=getIntent().getIntExtra("key", -1); return(i1); } @Override protected boolean isRouteDisplayed() { return false; } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); MapView mapView = (MapView) findViewById(R.id.mapview); mc = mapView.getController(); mapView.setBuiltInZoomControls(true); mapView.setSatellite(true); mc.setZoom(19); List&lt;Overlay&gt; mapOverlays = mapView.getOverlays(); Drawable drawable = this.getResources().getDrawable(R.drawable.androidmarker); HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this); GeoPoint point = new GeoPoint(19240000,-99120000); //GeoPoint point = new GeoPoint(19240000,test()); //GeoPoint point = new GeoPoint(19240000,message); OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!"); itemizedoverlay.addOverlay(overlayitem); mapOverlays.add(itemizedoverlay); // LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); // Criteria criteria = new Criteria(); // criteria.setAccuracy( Criteria.ACCURACY_COARSE ); // String provider = lm.getBestProvider( criteria, true ); // if ( provider == null ) { // Toast.makeText(this, "No mock data mofo", Toast.LENGTH_SHORT).show(); // } /** 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); Toast.makeText(this, "mock data enabled mofo", Toast.LENGTH_SHORT).show(); } 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&lt;String&gt; data = new ArrayList&lt;String&gt;(); /** 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) {} } } private class MockGpsProvider extends AsyncTask&lt;String, Integer, Void&gt; { 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's savedInstanceState functionality) if(index &lt; 5) { 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()); // 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]; } } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_main, menu); return true; } </code></pre> <p>}</p>
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    1. COCould you provide the callstack of the crash?
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    2. CO10-02 16:45:06.527: E/AndroidRuntime(3633): FATAL EXCEPTION: main 10-02 16:45:06.527: E/AndroidRuntime(3633): java.lang.NullPointerException 10-02 16:45:06.527: E/AndroidRuntime(3633): at com.example.hellogooglemaps.MainActivity.onLocationChanged(MainActivity.java:76) 10-02 16:45:06.527: E/AndroidRuntime(3633): at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:227) 10-02 16:45:06.527: E/AndroidRuntime(3633): at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:160)
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      1. POAndroid, adding overlay icon to onLocationChange causing crash
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