Displaying Callout

ChanceJason — Tue, 23 Apr 2024 05:59:26 GMT

I am developing a feature using Android's MapView where a callout should appear when a user taps on a polygon graphic. Currently, I am facing an issue where, although the polygon graphic is selected (graphic.isSelected = true), the callout does not display. The logcat outputs "show," indicating that the code to display the callout has been executed.

Here is the relevant part of my code in the fragment:

lifecycleScope.launch {
    mapView = binding.mapView.apply {
        setMap(requireContext())
    }

    mapView.graphicsOverlays.add(viewModel.graphicsOverlays)
    calloutView =
        LayoutInflater.from(requireContext()).inflate(R.layout.layout_callout, null).apply {
            setOnClickListener {
                showDetail()
            }
        }

    mapView.singleTapConfirm(viewModel.graphicsOverlays, calloutView)
}

The singleTapConfirm and identifyGraphic functions are defined as follows:

suspend fun MapView.singleTapConfirm(graphicsOverlay: GraphicsOverlay, contentView: View? = null) {
    onSingleTapConfirmed.collect { event ->
        Log.e("singleTapConfirm","onSingleTapConfirmed")
        graphicsOverlay.clearSelection()
        // get screen point
        val screenCoordinate = event.screenCoordinate

        identifyGraphic(screenCoordinate, graphicsOverlay)?.let { selectedGraphic->
            if (contentView != null) { 
                callout.show(contentView,selectedGraphic)
                Log.e("singleTapConfirm","show")
                selectedGraphic.isSelected = true
            } else {
                Log.e("contentView", "contentView is null")
            }
        } ?: run {
            Log.e("contentView", "no graphics identified")
//            callout.isAnimationEnabled = false
            callout.dismiss()
        }
    }
}

suspend fun MapView.identifyGraphic(
    screenCoordinate: ScreenCoordinate,
    graphicsOverlay: GraphicsOverlay
): Graphic? {
    val graphics = mutableListOf<Graphic>()
    val identifyGraphicsOverlayResult =
        identifyGraphicsOverlay(
            graphicsOverlay,
            screenCoordinate,
            10.0,
            false,
            1
        )
    identifyGraphicsOverlayResult.getOrNull()?.let {
        it.graphics.toMutableList().forEach { graphic ->
            if (graphic.geometry is Polygon) {
                graphics.add(graphic)
            }
        }
        if (graphics.isNotEmpty()) return graphics[0]
    } ?: run { graphicsOverlay.clearSelection() }

    return null
}

I am not sure why the callout is not displaying even though the polygon is correctly identified and selected. Any suggestions or insights would be greatly appreciated.

Re: Displaying Callout

ChanceJason — Tue, 23 Apr 2024 06:11:32 GMT

sometimes it can show, but sometimes can not

Re: Displaying Callout

PuneetPrakash — Tue, 30 Apr 2024 18:20:25 GMT

Can you make sure that `selectedGraphic` always has a valid geometry associated with it when you call,

callout.show(contentView,selectedGraphic)

in the scenarios when the callout does show up vs when it does not show. Also check for the validity of the contentView. Try testing your code by showing the callout with a simple contentView which is just a text view.

contentView = TextView(applicationContext).apply { text = "lorem ipsum" }

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