Question

这是我的视图层次结构：

CoordinatorLayout
- AppBarLayout
- ViewPager
  - 4个片段

第一个片段有一个WebView（根是WebView）。

当在页面之间快速切换时，最终会出现此错误（随机发生，或在我无法确定的某个位置），从具有WebView的片段向右滑动它。

如果我在不包含WebViews的片段之间滑动，则无论我滑动多快或多少次，它都可以正常工作。

Stacktrace：

java.lang.IndexOutOfBoundsException: getChildDrawingOrder() returned invalid index 1 (child count is 1)
    at android.view.ViewGroup.getAndVerifyPreorderedIndex(ViewGroup.java:2055)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4190)
    at android.view.View.draw(View.java:21956)
    at android.view.View.updateDisplayListIfDirty(View.java:20830)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4217)
    at android.view.View.draw(View.java:21956)
    at androidx.viewpager.widget.ViewPager.draw(ViewPager.java:2426)
    at android.view.View.updateDisplayListIfDirty(View.java:20830)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.updateDisplayListIfDirty(View.java:20821)
    at android.view.View.draw(View.java:21685)
    at android.view.ViewGroup.drawChild(ViewGroup.java:4432)
    at android.view.ViewGroup.dispatchDraw(ViewGroup.java:4193)
    at android.view.View.draw(View.java:21956)
    at com.android.internal.policy.DecorView.draw(DecorView.java:795)
    at android.view.View.updateDisplayListIfDirty(View.java:20830)
    at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:575)
    at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:581)
    at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:654)
    at android.view.ViewRootImpl.draw(ViewRootImpl.java:3761)
    at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:3489)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2777)
    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1745)
    at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7730)
    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:966)
    at android.view.Choreographer.doFrame(Choreographer.java:725)
    at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:951)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:214)
    at android.app.ActivityThread.main(ActivityThread.java:7116)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:925)

Answer 1

对于我来说，很难理解为什么为什么IndexOutOfBoundException却看不到代码的某些部分。但是，我可以假定，在加载带有Fragment的{{1}}时，它正在尝试使用一些尚不可用的资源。因此，我想提出一个解决方法。

您可能会考虑设置WebView，以便即使您一直向下滑动也不会重新加载片段。以下是示例代码。

setOffscreenPageLimit

我希望能解决您的问题。

恢复带有Webview的片段时ViewPager崩溃

1 个答案: