使用 Jetpack Navigation 时 Compose Fragment 使应用程序崩溃

Question

我目前在 Jetpack Compose 中遇到一个非常奇怪的问题。我正在使用导航组件库（在 NavHostFragment 中托管片段）。一些较新的 Fragments 已经在使用 Compose，但我很少遇到这种崩溃。主要是在使用导航抽屉导航到设置页面并单击底部导航视图中的项目时返回。我目前正在使用 Jetpack Compose alpha-12 和 Navigation 2.3.0。

（使用普通 ViewBinding 时不会崩溃）

https://youtu.be/__pdZmApEfE

@AndroidEntryPoint
class StatisticsFragment : Fragment() {

  override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
  ): View {
    return ComposeView(requireContext()).apply {
      setContent {
        TemporyTheme {
          Text("Hello Compose!")
        }
      }
    }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.widget.DrawerLayout
    ...>

    <RelativeLayout
        ...>

        <RelativeLayout
            ...>

            <com.google.android.material.appbar.MaterialToolbar
                ... />

        </RelativeLayout>

        <!-- NavHost -->
        <androidx.fragment.app.FragmentContainerView
            android:id="@+id/nav_host_fragment"
            android:name="androidx.navigation.fragment.NavHostFragment"
            app:defaultNavHost="true"
            app:navGraph="@navigation/navigation_main"
            ... />

        <com.google.android.material.bottomnavigation.BottomNavigationView
            ... />

    </RelativeLayout>

    <com.google.android.material.navigation.NavigationView
        .../>

</androidx.drawerlayout.widget.DrawerLayout>

java.lang.NullPointerException: Attempt to invoke interface method 'void androidx.compose.runtime.MutableState.setValue(java.lang.Object)' on a null object reference
        at androidx.compose.ui.platform.AndroidComposeView.setLayoutDirection(AndroidComposeView.kt:797)
        at androidx.compose.ui.platform.AndroidComposeView.onRtlPropertiesChanged(AndroidComposeView.kt:724)
        at android.view.View.resolvePadding(View.java:20272)
        at android.view.ViewGroup.resolvePadding(ViewGroup.java:7765)
        at android.view.View.initializeScrollbarsInternal(View.java:6781)
        at android.view.View.<init>(View.java:6112)
        at android.view.ViewGroup.<init>(ViewGroup.java:697)
        at android.view.ViewGroup.<init>(ViewGroup.java:693)
        at android.view.ViewGroup.<init>(ViewGroup.java:689)
        at android.view.ViewGroup.<init>(ViewGroup.java:685)
        at androidx.compose.ui.platform.AndroidComposeView.<init>(AndroidComposeView.kt:116)
        at androidx.compose.ui.platform.WrapperKt.setContent(Wrapper.kt:123)
        at androidx.compose.ui.platform.AbstractComposeView.ensureCompositionCreated(ComposeView.kt:183)
        at androidx.compose.ui.platform.AbstractComposeView.onAttachedToWindow(ComposeView.kt:215)
        at android.view.View.dispatchAttachedToWindow(View.java:20479)
        at android.view.ViewGroup.dispatchAttachedToWindow(ViewGroup.java:3489)
        at android.view.ViewGroup.addViewInner(ViewGroup.java:5278)
        at android.view.ViewGroup.addView(ViewGroup.java:5064)
        at androidx.fragment.app.FragmentContainerView.addView(FragmentContainerView.java:290)
        at android.view.ViewGroup.addView(ViewGroup.java:5004)
        at androidx.fragment.app.FragmentStateManager.addViewToContainer(FragmentStateManager.java:830)
        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:520)
        at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
        at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2177)
        at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2094)
        at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:1990)
        at androidx.fragment.app.FragmentManager.run(FragmentManager.java:524)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:223)
        at android.app.ActivityThread.main(ActivityThread.java:7660)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

Answer 1

错误随 compose 的 beta 06 消失了

使用 Jetpack Navigation 时 Compose Fragment 使应用程序崩溃

Compose Fragment crashes application when using Jetpack Navigation

android

android-jetpack-compose