Using Vtm in Android Compose

[Psijic]

This is the minimal code I used to implement Vtm in Android Compose. Feel free to use and improve.

@Composable
fun VtmMapView() {
    val mapView = rememberMapViewWithLifecycle()
    with (mapView.map()){
        // Scale bar
        val mapScaleBar: MapScaleBar = DefaultMapScaleBar(mapView.map())
        val mapScaleBarLayer = MapScaleBarLayer(mapView.map(), mapScaleBar)
        mapScaleBarLayer.renderer.setPosition(GLViewport.Position.BOTTOM_LEFT)
        mapScaleBarLayer.renderer.setOffset(5 * CanvasAdapter.getScale(), 0f)
        mapView.map().layers().add(mapScaleBarLayer)

        val tileSource = OSciMap4TileSource()

        // Vector layer
        val tileLayer: VectorTileLayer = mapView.map().setBaseMap(tileSource)

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

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

        // Render theme
//        setTheme(VtmThemes.DEFAULT)

        setMapPosition(52.517037, 13.38886, 12.0)
    }

    AndroidView(factory = { mapView }) {}
}

@Composable
private fun rememberMapViewWithLifecycle(): MapView {
    val context = LocalContext.current
    val mapView = remember { MapView(context) }
    val observer = remember { VtmMapViewLifecycleObserver(mapView) }
    val lifecycle = LocalLifecycleOwner.current.lifecycle

    DisposableEffect(Unit) {
        lifecycle.addObserver(observer)
        onDispose {
            lifecycle.removeObserver(observer)
        }
    }

    return mapView
}

private class VtmMapViewLifecycleObserver(private val mapView: MapView) : DefaultLifecycleObserver {
    override fun onResume(owner: LifecycleOwner) {
        super.onResume(owner)
        mapView.onResume()
    }

    override fun onPause(owner: LifecycleOwner) {
        super.onPause(owner)
        mapView.onPause()
    }

    override fun onDestroy(owner: LifecycleOwner) {
        super.onDestroy(owner)
        mapView.onDestroy()
    }
}