android - 计算器 : Caused by nested views?

Question

刷新 SlidingTray(来自顶部的自定义 SlidingDrawer)内的 View 时发生崩溃。

我不确定是什么原因造成的...但我的第一个猜测是这是由于嵌套布局的数量...

嵌套布局的最大数量是多少？

它是特定于设备的吗？我如何确定这是否是原因？

如果不是，则这些因素中的任何一个都导致了它......是什么？

堆栈跟踪:

E/AndroidRuntime( 2199): FATAL EXCEPTION: main
E/AndroidRuntime( 2199): java.lang.StackOverflowError
E/AndroidRuntime( 2199): at android.graphics.Paint.measureText(Paint.java:1057)
E/AndroidRuntime( 2199): at android.text.Styled.drawDirectionalRun(Styled.java:267)
E/AndroidRuntime( 2199): at android.text.Styled.measureText(Styled.java:430)
E/AndroidRuntime( 2199): at android.text.Layout.measureText(Layout.java:1655)
E/AndroidRuntime( 2199): at android.text.Layout.getLineMax(Layout.java:689)
E/AndroidRuntime( 2199): at android.text.Layout.draw(Layout.java:340)
E/AndroidRuntime( 2199): at android.text.BoringLayout.draw(BoringLayout.java:365)
E/AndroidRuntime( 2199): at android.widget.TextView.onDraw(TextView.java:4168)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6880)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.widget.FrameLayout.draw(FrameLayout.java:357)
E/AndroidRuntime( 2199): at android.widget.ScrollView.draw(ScrollView.java:1409)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.buildDrawingCache(View.java:6640)
E/AndroidRuntime( 2199): at android.view.View.getDrawingCache(View.java:6428)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1571)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1392)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.widget.FrameLayout.draw(FrameLayout.java:357)
E/AndroidRuntime( 2199): at android.widget.ScrollView.draw(ScrollView.java:1409)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6986)
E/AndroidRuntime( 2199): at android.widget.FrameLayout.draw(FrameLayout.java:357)
E/AndroidRuntime( 2199): at android.widget.HorizontalScrollView.draw(HorizontalScrollView.java:1409)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at com.vodafone.onm.components.SlidingTray.dispatchDraw(SlidingTray.java:426)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1644)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.widget.FrameLayout.draw(FrameLayout.java:357)
E/AndroidRuntime( 2199): at android.view.ViewGroup.drawChild(ViewGroup.java:1646)
E/AndroidRuntime( 2199): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1373)
E/AndroidRuntime( 2199): at android.view.View.draw(View.java:6883)
E/AndroidRuntime( 2199): at android.widget.FrameLayout.draw(FrameLayout.java:357)
E/AndroidRuntime( 2199): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java)

更新:层次结构查看器快照

• http://d.pr/kXnp

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有些我认为是相关的: http://www.mail-archive.com/android-developers@googlegroups.com/msg48036.html

Answer 1

What is the maximum number of nested layouts?

没有具体值。当你用完堆栈空间时，你就用完了堆栈空间，这将取决于你在做什么。我最后听说，主应用程序线程有一个 8KB 的堆栈。

也就是说，如果层次结构 View 显示的深度为 10 或更多(从根到最深的叶)，我开始感到紧张，到 15 时您可能会开始遇到异常。您的图像几乎难以辨认，但其深度似乎远高于此。

您似乎浪费了很多层。如果层次结构 View 中的层在关键路径上有一个父层和一个子层，则该层是要删除的主要候选层，因为它可能不会增加任何值(value)。您至少有 5 个这样的候选人。即使清理所有这些可能还不够，但这是一个起点。