DatabaseRenderer: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.FileInputStream android.app.Application.openFileInput(java.lang.String)' on a null object reference

[l3ah1.d...@gmail.com]

i am traing to make an offline map with mapsforge i flowd the example on https://github.com/mapsforge/mapsforge/blob/master/mapsforge-samples-android/src/main/java/org/mapsforge/samples/android/GettingStarted.java    the first time it worked but i tried to add a gps location to that code but the map doesn't apeer now end i get

DatabaseRenderer: java.lang.NullPointerException: Attempt to invoke virtual method 'java.io.FileInputStream android.app.Application.openFileInput(java.lang.String)' on a null object reference

           public class map extends AppCompatActivity {
       @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);


Drawable myLocationMarker = this.getResources().getDrawable(R.drawable.person);


// final MapViewPosition mapViewPosition = this.mapView.getModel().mapViewPosition;

try {


    mapView = new MapView(this);
    setContentView(mapView);
              mapView.setClickable(true);
    mapView.getMapScaleBar().setVisible(true);
    mapView.setBuiltInZoomControls(true);

            TileCache tileCache = AndroidUtil.createTileCache(map.this, "mapcache",
            mapView.getModel().displayModel.getTileSize(), 1f,
            mapView.getModel().frameBufferModel.getOverdrawFactor());


    File file = new File("/sdcard/download/","centre.map");



    MapDataStore mapDataStore = new MapFile(file);
    TileRendererLayer tileRendererLayer = new TileRendererLayer(tileCache, mapDataStore,
            mapView.getModel().mapViewPosition, AndroidGraphicFactory.INSTANCE);
    tileRendererLayer.setXmlRenderTheme(InternalRenderTheme.DEFAULT);


    mapView.getLayerManager().getLayers().add(tileRendererLayer);


    mapView.setZoomLevel((byte) 10);
} catch (Exception e) {

    e.printStackTrace();
}

}

   @Override
   protected void onDestroy() {
       mapView.destroyAll();
    AndroidGraphicFactory.clearResourceMemoryCache();
    super.onDestroy();
     }
      }

i don't understand the problem

[Emux]

You have multiple setContentView, try following closely the GettingStarted guide (there're missing calls) or modify it properly.

The extra steps to add a location overlay can be found in LocationOverlayMapViewer example at mapsforge-samples-android.

--
Emux

[l3ah1.d...@gmail.com]

Le lundi 30 avril 2018 22:52:12 UTC+2, l3ah1.d...@gmail.com a écrit :

thank you very match for your help i fond the cause of the  problem i have forgotten  to put 

 

AndroidGraphicFactory.createInstance(getApplication());