Problem with maps of two activities

[alich65]

Hi,
I have two activities with map. When I back to MainActivity, the map not showing. Please watch below video. This is my code:

MainActivity.java

`public class MainActivity extends AppCompatActivity {

private MapView mapView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button btnSecond = findViewById(R.id.btn_second_activity);
    btnSecond.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
            startActivity(intent);
        }
    });


    createMap();

    addBaseMap();
}

private void createMap(){
    mapView = findViewById(R.id.map_view_main);

    mapView.setClickable(true);

    GeoPoint center = new GeoPoint(47.7734, 10.0408);

    MapPosition centerMap = new MapPosition(center.getLatitude(), center.getLongitude(),50);
    mapView.map().animator().animateTo(centerMap);
}

private void addBaseMap(){
    BitmapTileSource osmTileSource = BitmapTileSource.builder()
            .url("https://tile.openstreetmap.org")
            .tilePath("/{Z}/{X}/{Y}.png")
            .build();

    BitmapTileLayer osmLayer = new BitmapTileLayer(mapView.map(), osmTileSource);
    osmLayer.setEnabled(true);
    mapView.map().layers().add(osmLayer);
}

@Override
protected void onResume() {
    super.onResume();
    mapView.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    mapView.onPause();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
}
}`

SecondActivity.java

     `public class SecondActivity extends AppCompatActivity {

private MapView mapView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    createMap();

    addBaseMap();
}

private void createMap(){
    mapView = findViewById(R.id.map_view_second);
    mapView.setClickable(true);

    GeoPoint center = new GeoPoint(47.7734, 10.0408);

    MapPosition centerMap = new MapPosition(center.getLatitude(), center.getLongitude(),200);
    mapView.map().animator().animateTo(centerMap);
}

private void addBaseMap(){
    BitmapTileSource osmTileSource = BitmapTileSource.builder()
            .url("https://tile.openstreetmap.org")
            .tilePath("/{Z}/{X}/{Y}.png")
            .build();

    BitmapTileLayer osmLayer = new BitmapTileLayer(mapView.map(), osmTileSource);
    osmLayer.setEnabled(true);
    mapView.map().layers().add(osmLayer);
}

@Override
protected void onResume() {
    super.onResume();
    mapView.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    mapView.onPause();
}

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

}`

Can anyone help me?
Thanks

Rec.0006.mp4

[devemux86]

Multiple VTM instances are not supported (#888).

However you can always return to a working map view.
See how vtm-android-example samples work and BitmapTileActivity example.

[alich65]

Is there any way for do this?
Can I use mapView's Mapsforge in my VTM project?

[devemux86]

Mapsforge MapView is a regular View, so you can place it in any layout.