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Extension functions to display a Jetpack Compose bottom sheet over Android view
// Extension for Activity
fun Activity.showAsBottomSheet(content: @Composable (() -> Unit) -> Unit) {
val viewGroup = this.findViewById(android.R.id.content) as ViewGroup
addContentToView(viewGroup, content)
}
// Extension for Fragment
fun Fragment.showAsBottomSheet(content: @Composable (() -> Unit) -> Unit) {
val viewGroup = requireActivity().findViewById(android.R.id.content) as ViewGroup
addContentToView(viewGroup, content)
}
// Helper method
private fun addContentToView(
viewGroup: ViewGroup,
content: @Composable (() -> Unit) -> Unit
) {
viewGroup.addView(
ComposeView(viewGroup.context).apply {
setContent {
BottomSheetWrapper(viewGroup, this, content)
}
}
)
}
@OptIn(ExperimentalMaterialApi::class)
@Composable
private fun BottomSheetWrapper(
parent: ViewGroup,
composeView: ComposeView,
content: @Composable (() -> Unit) -> Unit
) {
val TAG = parent::class.java.simpleName
val coroutineScope = rememberCoroutineScope()
val modalBottomSheetState = rememberModalBottomSheetState(ModalBottomSheetValue.Hidden)
var isSheetOpened by remember { mutableStateOf(false) }
ModalBottomSheetLayout(
sheetBackgroundColor = Color.Transparent,
sheetState = modalBottomSheetState,
sheetContent = {
content {
// Action passed for clicking close button in the content
coroutineScope.launch {
modalBottomSheetState.hide() // will trigger the LaunchedEffect
}
}
}
) {}
BackHandler {
coroutineScope.launch {
modalBottomSheetState.hide() // will trigger the LaunchedEffect
}
}
// Take action based on hidden state
LaunchedEffect(modalBottomSheetState.currentValue) {
when (modalBottomSheetState.currentValue) {
ModalBottomSheetValue.Hidden -> {
when {
isSheetOpened -> parent.removeView(composeView)
else -> {
isSheetOpened = true
modalBottomSheetState.show()
}
}
}
else -> {
Log.i(TAG, "Bottom sheet ${modalBottomSheetState.currentValue} state")
}
}
}
}
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