Demo OSM map initialization

TransportActivity.kt

class TransportActivity : AppCompatActivity() {

    companion object {
        val TAG = TransportActivity::class.simpleName
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //handle permissions first, before map is created. not depicted here
        //load/initialize the osmdroid configuration, this can be done
        Configuration.getInstance().load(applicationContext, PreferenceManager.getDefaultSharedPreferences(applicationContext))
        //setting this before the layout is inflated is a good idea
        //it 'should' ensure that the map has a writable location for the map cache, even without permissions
        //if no tiles are displayed, you can try overriding the cache path using Configuration.getInstance().setCachePath
        //see also StorageUtils
        //note, the load method also sets the HTTP User Agent to your application's package name, abusing osm's tile servers will get you banned based on this string

        //inflate and create the map
        setContentView(R.layout.activity_transport)
        setSupportActionBar(toolbar)
        init()
    }

    override fun init() {
        map_view.setTileSource(TileSourceFactory.DEFAULT_TILE_SOURCE)
        map_view.setBuiltInZoomControls(true)
        map_view.setMultiTouchControls(true)
        map_view.controller.setZoom(15.0)
        val gPt = GeoPoint(28.6337874, 77.35767599999997)
        val gPt2 = GeoPoint(28.638472, 77.360667)
        map_view.controller.setCenter(gPt)

        /*place icon on map*/
        val items = ArrayList<OverlayItem>()
        items.add(OverlayItem("Current Location", "Amrapali Village, Indirapuram", gPt))
        items.add(OverlayItem("Destination", "Aditya Mall, Indirapuram", gPt2))

        val mOverlay = ItemizedOverlayWithFocus<OverlayItem>(items,
                object : ItemizedIconOverlay.OnItemGestureListener<OverlayItem> {
                    override fun onItemSingleTapUp(index: Int, item: OverlayItem): Boolean {
                        //do something
                        Log.d(TAG, "onItemSingleTapUp()")
                        return true
                    }

                    override fun onItemLongPress(index: Int, item: OverlayItem): Boolean {
                        Log.d(TAG, "onItemLongPress()")
                        return false
                    }
                }, this)
        mOverlay.setFocusItemsOnTap(true)
        map_view.overlays.add(mOverlay)
    }

    public override fun onResume() {
        super.onResume()
        //this will refresh the osmdroid configuration on resuming.
        //if you make changes to the configuration, use
        //SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        //Configuration.getInstance().load(this, PreferenceManager.getDefaultSharedPreferences(this));
        map_view.onResume() //needed for compass, my location overlays, v6.0.0 and up
    }

    public override fun onPause() {
        super.onPause()
        //this will refresh the osmdroid configuration on resuming.
        //if you make changes to the configuration, use
        //SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
        //Configuration.getInstance().save(this, prefs);
        map_view.onPause()  //needed for compass, my location overlays, v6.0.0 and up
    }
}