你能用旧的导航图和喷气背包作曲吗

Question

我正在将一个片段从旧的Jetpack迁移到Jetpack Compose。此片段是现有导航图的一部分。

迁移片段（使用ComposeView）进行合成后，片段方向不再可用。

这种情况下你会怎么做？片段是导航图一部分，几个未组合的片段导航到它。

以下是片段的 onCreateView：

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
) = ComposeView(requireContext()).apply {
    setViewCompositionStrategy(ViewCompositionStrategy.DisposeOnViewTreeLifecycleDestroyed)
    setContent {
        val surface = ThemeUtils.getColor(context, getBackgroundColor())
        val primaryText = ThemeUtils.getColor(context, R.attr.textColorPrimary)
        val secondaryText = ThemeUtils.getColor(context, R.attr.userEducationButtonTextColor)
        val userEducationFragmentButtonColor = ThemeUtils.getColor(context, R.attr.userEducationButtonColor)
        val colors = MaterialTheme.colors.copy(
            surface = Color(surface),
            primary = Color(ThemeUtils.getPrimaryColor(context)),
            onPrimary = Color(primaryText),
            onSecondary = Color(secondaryText),
            secondary = Color(userEducationFragmentButtonColor),
            )
        MaterialTheme(colors) {
            UserEducationScreen(
                title = viewModel.title,
                subtext = viewModel.subtext,
                backgroundIconUrl = viewModel.backgroundIconUrl,
                backgroundImage = viewModel.backgroundImage,
                imageUrl = viewModel.imageUrl,
                showIconImage = viewModel.showIcon,
                primaryButtonText = viewModel.primaryButtonText,
                primaryButtonClick = viewModel.primaryButtonClick ?: {},
                secondaryButtonText = viewModel.secondaryButtonText,
                secondaryButtonClick = viewModel.secondaryButtonClick ?: {},
                showArrow = viewModel.showArrow,
                showSecondaryButton = viewModel.showSecondaryButton,
                screenSizePercentage = getScreenPercent(),
                screenSize = api.getScreenSize(context)
            )
        }
    }
}

Answer 1

在XML中完成的导航图仅支持导航到片段/活动/其他图。如果您想在其中处理可组合文件并仍然使用xml导航图，您仍然必须使用Fra（片段）。但是，片段用于膨胀其根的布局可以只有一个填充xml布局的ComposeView。我可以想象您可以利用AbstractComposeView做这样的事情：

片段的xml布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <com.my.app.CustomComposeView
        android:id="@+id/customView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>

</androidx.constraintlayout.widget.ConstraintLayout>

然后是您的自定义组合视图代码：

class CustomComposeView @JvmOverloads constructor (
    context: Context,
    attrs: AttributeSet? = null,
    defStyle: Int = 0,
) : AbstractComposeView(context, attrs, defStyle) {
    
    @Composable
    override fun Content() {
        // Your compose code for your fragment here
    }
}