Map issue after open Intent.ACTION_OPEN_DOCUMENT on Android

[moiatto]

Everything works fine.
My only problem is when I call Intent.ACTION_OPEN_DOCUMENT to load a GPX file.
The GPX file is imported correctly, added in a new layer. Perfect.
I have found that, after closing the Intent.ACTION_OPEN_DOCUMENT, this gives me problems on the map.

Before open intent:

After close intent:

What can it be?

[devemux86]

It seems the MapView / OpenGL is initialized many times(?).
See how to handle the MapView's life cycle in GettingStarted example.

[moiatto]

I followed exactly the GettingStarted example.
The only difference is that I use MultiMapFileTileSource instead one MapFileTileSource.

The problem only occurs when I open a file with the Intent.ACTION_OPEN_DOCUMENT.
If I import a GPX file directly without the Intent, it works perfectly.

This in my onCreate():

       // ------------------- //
        //  MapsForge - VTM  //
        // ------------------- //

        // init MapView, Map and Preferences
        mapView = findViewById(R.id.mapView);
        map = mapView.map();
        mapPrefs = new MapPreferences(MainActivity.class.getName(), getApplicationContext());

        openMaps();

        // Register the Intent for open PICKER to select track file GPX
        intentACTION_IMPORT_TRACK_FILE = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intentACTION_IMPORT_TRACK_FILE.setType("*/*");
        intentACTION_IMPORT_TRACK_FILE.addCategory(Intent.CATEGORY_OPENABLE);

        resultActivityLauncherACTION_IMPORT_TRACK_FILE = registerForActivityResult(
                new ActivityResultContracts.StartActivityForResult(),
                result -> {
                    if (result.getResultCode() == Activity.RESULT_OK) {
                        //grant persistent read permissions
                        Intent intent = result.getData();
                        assert intent != null;
                        Uri trackFileUri = intent.getData();

                        DocumentFile trackFile = DocumentFile.fromSingleUri(getApplicationContext(), trackFileUri);
                        assert trackFile != null;
                        Log.i("mapsforge", "Track File: " + trackFile.getName());

                        cleanTracksLayers();

                        // Check file size (<3MB)
                        if ((trackFile.length()/1024) > 3000) {
                            Toasty.error(mapView.getContext(), "Track file is too big! Must be less 3 Mbyte.", Toasty.LENGTH_LONG).show();
                        }
                        else {
                            if (Objects.requireNonNull(trackFile.getName()).endsWith(".gpx"))
                                parseGPXfiles(trackFile);
                            else
                                Toasty.error(mapView.getContext(), "No track file!", Toasty.LENGTH_LONG).show();
                        }
                    }
                });

    private void openMaps() {
        // Load  map files from default folder
        tileSources = new MultiMapFileTileSource();
        checkMapFilesDownloaded();
        ArrayList<FileInputStream> mapFiles = loadMapFiles();
        if (mapFiles != null)
            for (FileInputStream fis : mapFiles)
            {
                tileSource = new MapFileTileSource();
                tileSource.setMapFileInputStream(fis);
                tileSources.add(tileSource);
            }

        // Set map language
        String language = Locale.getDefault().getLanguage();
        Log.i("mapsforge", "Device local language: " + language);
        if (language.equals("en") || language.equals("de") || language.equals("fr") || language.equals("es"))
            tileSources.setPreferredLanguage(language);
        else
            tileSources.setPreferredLanguage("en");

        // Vector layer
        VectorTileLayer tileLayer = map.setBaseMap(tileSources);

        // Building layer
        map.layers().add(new BuildingLayer(map, tileLayer));

        // Label layer
        map.layers().add(new LabelLayer(map, tileLayer));

        // Render theme
        theme = map.setTheme(VtmThemes.DEFAULT);

        //------------ MapEventsReceiver implementation to handle SingleTap and LongTap on Map
        map.layers().add(new MapEventsReceiver(map));

        // Scale bar
        MapScaleBar mapScaleBar = new DefaultMapScaleBar(map);
        MapScaleBarLayer mapScaleBarLayer = new MapScaleBarLayer(map, mapScaleBar);
        mapScaleBarLayer.getRenderer().setPosition(GLViewport.Position.TOP_CENTER);
        mapScaleBarLayer.getRenderer().setOffset(5 * CanvasAdapter.getScale(), 0);
        map.layers().add(mapScaleBarLayer);

        // Set position
        GeoPoint mapCenter = tileSources.getBoundingBox().getCenterPoint();
        mapPosition = new MapPosition();
        mapPosition.setPosition(prefs.getFloat("lastMapPosition_lat", (float) mapCenter.getLatitude()), prefs.getFloat("lastMapPosition_log", (float) mapCenter.getLongitude()));
        map.setMapPosition(mapPosition);

        // init Style for Tracks layer (GPX)
        int colorTrack_line = ContextCompat.getColor(getApplicationContext(), R.color.color_Nav_Track_line1);
        styleTrack = Style.builder()
                .strokeWidth(3)
                .strokeColor(colorTrack_line)
                .build();
        // init track path layers (GPX)
        trackPathLayers = new ArrayList<>();
        // init tracks point layer (GPX)
        pointMarkers = new ItemizedLayer(map, new ArrayList<>(), (MarkerSymbol) null, this);
        map.layers().add(pointMarkers);

        // init POI markers layer
        poiMarkers = new ItemizedLayer(map, new ArrayList<>(), (MarkerSymbol) null, this);
        map.layers().add(poiMarkers);

        // init MainRoad path layer
        pathLayers = new ArrayList<>(2);
        int colorMainRoad_line = ContextCompat.getColor(getApplicationContext(), R.color.color_Nav_MainRoad_line);
        styleMainRoad = Style.builder()
                .strokeWidth(4)
                .strokeColor(colorMainRoad_line)
                .build();
        PathLayer pathLayer = new PathLayer(map, styleMainRoad);
        map.layers().add(pathLayer);
        pathLayers.add(pathLayer);
        // init Alternative Roads path layer
        int colorAlternativeRoads_line = ContextCompat.getColor(getApplicationContext(), R.color.color_Nav_AlternativeRoads_line);
        styleAlternativeRoads = Style.builder()
                .strokeWidth(2.5f)
                .strokeColor(colorAlternativeRoads_line)
                .build();
        pathLayer = new PathLayer(map, styleAlternativeRoads);
        map.layers().add(pathLayer);
        pathLayers.add(pathLayer);

        // init Destination marker layer
        destinationMarker = new ItemizedLayer(map, new ArrayList<>(), (MarkerSymbol) null, this);
        map.layers().add(destinationMarker);

        // init ViaPoints marker layer
        viaPointMarkers = new ItemizedLayer(map, new ArrayList<>(), (MarkerSymbol) null, this);
        map.layers().add(viaPointMarkers);

        // Location layer
        locationLayer = new LocationTextureLayer(map);
        Bitmap bitmapIconNavArrow = new AndroidBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_nav_arrow));
        locationLayer.locationRenderer.setBitmapArrow(bitmapIconNavArrow);
        locationLayer.locationRenderer.setBitmapMarker(bitmapIconNavArrow);
        locationLayer.locationRenderer.setCallback(new LocationCallback()
        {
            @Override
            public boolean hasRotation() {
                return locationGps != null && locationGps.hasBearing();
            }

            @Override
            public float getRotation() {
                return (locationGps != null && locationGps.hasBearing()) ? locationGps.getBearing() : 0;
            }
        });
        locationLayer.setEnabled(false);
        map.layers().add(locationLayer);
    }

[moiatto]

Don't ask me how, but it works now :-)

Mysteries!