LayerManager.persistLayers 抛出 NullPointerException

Question

我们看到一个 NullPointerException 是由 compose 的

LayerManager.persistLayers

引起的。 问题是我们无法重现这个错误。仅在使用 NO Compose 的屏幕上才会引发异常。它发生在所有类型的设备和 Android 版本上（从 Android 11 开始）。

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Class java.lang.Object.getClass()' on a null object reference
       at androidx.compose.ui.graphics.layer.LayerManager.persistLayers(LayerManager.android.kt:116)
       at androidx.compose.ui.graphics.layer.LayerManager.updateLayerPersistence(LayerManager.java:136)
       at androidx.compose.ui.graphics.AndroidGraphicsContext$componentCallback$1$onTrimMemory$1.onPreDraw(AndroidGraphicsContext.android.kt:79)
       at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:1204)
       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:4723)
       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:3288)
       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:11344)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1689)
       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1698)
       at android.view.Choreographer.doCallbacks(Choreographer.java:1153)
       at android.view.Choreographer.doFrame(Choreographer.java:1079)
       at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1646)
       at android.os.Handler.handleCallback(Handler.java:958)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loopOnce(Looper.java:230)
       at android.os.Looper.loop(Looper.java:319)
       at android.app.ActivityThread.main(ActivityThread.java:8919)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
        

我正在使用以下版本的 compose ui：

{ group = "androidx.compose.ui", name = "ui", version = "1.7.0-rc01" }

以及这个版本的生命周期：

{ group = "androidx.lifecycle", name = "lifecycle-runtime-compose", version = "2.8.4" }

有没有人也经历过这种异常，并且有关于如何防止它的提示？它是由有缺陷的库版本引入的吗？

Answer 1

这不是任何库问题，请检查您的代码，您在组件中传递了任何空对象，请调试您的代码