Set mapview options

Here are some optional, but useful additional configurations.

• Alter MapView configuration to get smoother map manipulation experience

        // use more threads for tile loading. Helps a lot with multi-core devices
        // optimal number of threads may be different on different devices
        mapView.getOptions().setRasterTaskPoolSize(4);

        // preload map tiles outside current view. Makes map panning faster, with cost of extra bandwidth usage
        mapView.getOptions().setPreloading(true);
        // repeating world view if you are panning out of map to east or west. Usually important for most general zooms only.
        mapView.getOptions().setSeamlessHorizontalPan(true);
        // blending animation for tile replacement
        mapView.getOptions().setTileFading(true);
        // pan/scroll map dynamically
        mapView.getOptions().setKineticPanning(true);
        // enable doubleclick gesture for zoom in
        mapView.getOptions().setDoubleClickZoomIn(true);
        // enable two-finger touch gesture to zoom out
        mapView.getOptions().setDualClickZoomOut(true);

• Define bitmaps for sky view and map background

        // set sky bitmap - optional, default - white
        mapView.getOptions().setSkyDrawMode(Options.DRAW_BITMAP);
        mapView.getOptions().setSkyOffset(4.86f);
        // see sample image for good size ideas
        mapView.getOptions().setSkyBitmap(
                UnscaledBitmapLoader.decodeResource(getResources(),
                        R.drawable.sky_small));

        // Map background, visible if no map tiles loaded - optional, default - white
        mapView.getOptions().setBackgroundPlaneDrawMode(Options.DRAW_BITMAP);
        mapView.getOptions().setBackgroundPlaneBitmap(
                UnscaledBitmapLoader.decodeResource(getResources(),
                        R.drawable.background_plane));
        mapView.getOptions().setClearColor(Color.WHITE);

• Configure caching to make later data loading much faster.

        // configure texture caching. Following are usually good values
        mapView.getOptions().setTextureMemoryCacheSize(40 * 1024 * 1024);
        mapView.getOptions().setCompressedMemoryCacheSize(8 * 1024 * 1024);
        
        // turn on persistent caching for particular layer, it is off by default
        mapLayer.setPersistentCaching(true);

        // define online map persistent caching
        mapView.getOptions().setPersistentCachePath(
                 this.getDatabasePath("mapcache").getPath());
        // set persistent raster cache limit to 100MB. Use any value you feel appropriate
        mapView.getOptions().setPersistentCacheSize(100 * 1024 * 1024);

• Define initial map view coordinates. Here is perspective (2.5D) view.

        // Location: San Francisco 
        // NB! it must be in base layer projection (EPSG3857), so we convert it from lat and long
        mapView.setFocusPoint(mapView.getLayers().getBaseLayer().getProjection().fromWgs84(-122.41666666667f, 37.76666666666f));
        // rotation - 0 = north-up
        mapView.setMapRotation(0f);
        // zoom - 0 = world, like on most web maps
        mapView.setZoom(7.0f);
        // tilt means perspective view. Default is 90 degrees for "normal" 2D map view, minimum allowed is 30 degrees.
        mapView.setTilt(35.0f);