AlertDialogBuilder

Context

AlertDialog

setContent { … }

ComposeView

AlertDialog

Context

navigation-compose

AlertDialog

DialogFragment

/**
 * ComposeView (copied code since you can't extend from it) who implements DialogWindowProvider 
 * and returns a window from the attached dialog.
 */
class DialogComposeView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : AbstractComposeView(context, attrs, defStyleAttr), DialogWindowProvider  {

    constructor(dialog: Dialog): this(dialog.context) {
        this.dialog = dialog
    }

    private val content = mutableStateOf<(@Composable () -> Unit)?>(null)

    var dialog: Dialog? = null

    override val window: Window
        get() = dialog?.window ?: throw IllegalStateException("Not attached to a dialog or a window")

    @Suppress("RedundantVisibilityModifier")
    protected override var shouldCreateCompositionOnAttachedToWindow: Boolean = false
        private set

    @Composable
    override fun Content() {
        content.value?.invoke()
    }

    override fun getAccessibilityClassName(): CharSequence {
        return javaClass.name
    }

    /**
     * Set the Jetpack Compose UI content for this view.
     * Initial composition will occur when the view becomes attached to a window or when
     * [createComposition] is called, whichever comes first.
     */
    fun setContent(content: @Composable () -> Unit) {
        shouldCreateCompositionOnAttachedToWindow = true
        this.content.value = content
        if (isAttachedToWindow) {
            createComposition()
        }
    }
}

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    val composeView = DialogComposeView(requireContext()).apply {
        setContent {
            // my composable
        }
    }
    return MaterialAlertDialogBuilder(requireContext()).apply {
        setView(composeView)
    }.create().also {
        composeView.dialog = it
    }
}

AppCompatDialogFragment

override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        val dialog = requireDialog() as ComponentDialog
        
        return DialogComposeView(dialog).apply {
            layoutParams = ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
            )
            id = composeViewId
            setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)

            setContent {
                CompositionLocalProvider(
                    LocalOnBackPressedDispatcherOwner provides dialog,
                ) {
                    MyTheme {
                        FragmentContent()
                    }
                }
            }
        }
    }

AlertDialog

AlertDialog

onCreateDialog

TextField

minLines

maxLines