Here SDK Android resize on layout changes

Question

We are having hard times to smoothly resize a here SDK map on Android.

We want to smoothly resize the map to the bottom sheet collapse and hidden state as shown in

But as you can see it does not really resize instead its jumps to the new position while the map keeps its dimensions and does not scale.

And this is what we did:

...
<com.here.sdk.mapview.MapView
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="@dimen/nine_grid_unit" />

<androidx.constraintlayout.widget.ConstraintLayout
    android:id="@+id/menuBottomSheet"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:clickable="true"
    android:elevation="@dimen/four_grid_unit"
    android:focusable="true"
    app:behavior_hideable="true"
    app:behavior_peekHeight="@dimen/thirtytwo_grid_unit"
    app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">

    <View
        android:id="@+id/tap_stop"
        android:layout_width="@dimen/nine_grid_unit"
        android:layout_height="@dimen/one_grid_unit"
        android:layout_marginTop="@dimen/one_grid_unit"
        android:background="@color/grey_light"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <edeka.digital.app.widget.SegmentedControlView
        android:id="@+id/tabSwitchSegmentedControl"
        android:layout_width="@dimen/thirtyfive_grid_unit"
        android:layout_height="wrap_content"
        android:paddingStart="@dimen/three_grid_unit"
        android:paddingEnd="@dimen/three_grid_unit"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tap_stop"
        app:segmentCount="2"
        app:segmentTitles="@array/segment_titles_shop_search" />

</androidx.constraintlayout.widget.ConstraintLayout>
...

And code:

val bottomBehavior = BottomSheetBehavior.from(binding.menuBottomSheet)
    bottomBehavior.addBottomSheetCallback(object : BottomSheetBehavior.BottomSheetCallback() {
        val mapView = binding.map
        override fun onSlide(bottomSheet: View, slideOffset: Float) {

        }

        override fun onStateChanged(bottomSheet: View, newState: Int) {

            bottomSheetBehaviorObservable.onNext(newState)

            when (newState) {
                BottomSheetBehavior.STATE_COLLAPSED -> {
                    mapView.bottom = binding.menuBottomSheet.top
                    mapView.invalidate()

                }
                BottomSheetBehavior.STATE_HIDDEN -> {
                    mapView.bottom = binding.menuBottomSheet.top
                    mapView.invalidate()
                }
                else -> { /* void */
                }
            }
        }
    })

I would have expected some kind of resize() function or that it layouts itself if layout dimensions change.

Can anyone help us out?

The demo shown in 1 can be found here:

https://github.com/edekadigital/heremaps-demo

Answer 1

It looks like that your map view is covered by the sliding panel and is not redrawn during slide animation. It renders only when the state changes. You can try to add mapView.invalidate() in onSlide method, like this:

override fun onSlide(bottomSheet: View, slideOffset: Float) {
    mapView.invalidate()
}

However, to be sure if that's the actual reason, I would need to get and build your code.