title: osmdroid map tiles showing blank
body: <p>I am new to osmdroid and trying to show maps in android, it is not showing map only showing tiles in blank, not showing zoom control also.</p>
  
  <p>my code:</p>
  
  <pre><code>public class MainActivity extends Activity {
  
  private MapView m_mapView; 
  private int MAP_DEFAULT_ZOOM = 16; 
  private double MAP_DEFAULT_LATITUDE =  33.6667; 
  // Default map Longitude: 
  private double MAP_DEFAULT_LONGITUDE = 73.1667;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main); 
      m_mapView = (MapView) findViewById(R.id.mapview); 
     // m_mapView.setTileSource(TileSourceFactory.MAPQUESTOSM); 
      m_mapView.setTileSource(TileSourceFactory.MAPNIK);
      m_mapView.setBuiltInZoomControls(true); 
      m_mapView.setMultiTouchControls(true); 
      m_mapView.setClickable(true); 
      m_mapView.setUseDataConnection(true); 
      m_mapView.getController().setZoom(16); 
     m_mapView.getController().setCenter(new GeoPoint(33.6667, 73.1667)); 
  }
  </code></pre>
  
  <p>i have added this in AndroidManifest,xml also</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/&gt;
  &lt;uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/&gt;
  &lt;uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /&gt;
  &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /&gt;
  &lt;uses-permission android:name="android.permission.INTERNET" /&gt;
  
  &lt;uses-feature android:name="android.hardware.location.network" /&gt;
  &lt;uses-feature android:name="android.hardware.location.gps" /&gt;   
  &lt;uses-feature android:name="android.hardware.wifi" /&gt;
  </code></pre>