Android开发中StackOverflowError错误实例分析
一、概述
我在一个复杂的layout嵌套较多的android界面，碰到了java.lang.StackOverflowError这个Fatal Exception，app程序crash退出。这个错误出现的比较奇怪，在我做技术调研的时候，这个界面是放在单独的一个程序中展示的，工作很正常，没有出现这个严重错误,当将其嵌入到一个ActivityGroup后才报错。
android SDK中对该错误的出现的场景描述为：由于栈调用的层次太多，超过了虚拟器dalvik的最大限制（作为一个虚拟器参数，可定制）导致的。当程序编写错误导致无限递归调用时会触发，此外程序正确但是递归调用的层次过深也会触发。
结合我的界面的情况，在单独程序中运行时没有问题，则说明不存在死循环的无限递归错误。观察该界面的集成情况，发现为了Tab页实现，该界面在显示时，被两个ActivityGroup嵌套，增加了6层显式父layout。而因为该界面复杂，设计时，list_header view的layout深度为5层，而list_item的深度则为6层。原因定位为界面嵌套层次过深。
二、解决方法
解决嵌套过深的基本思路是在实现同样的效果的前提下减少界面的layout深度。在我将list_header view layout深度由5层精简为3层，list_item 深度由6层减少为4层后，该错误被解决。具体的方法有：
1) 多用RelativeLayout的各种布局属性来完成布局，而避免过多使用嵌套layout来实现。
2) 占位或填充剩余空间的元素多用View，避免使用layout等viewGroup。
总结下，从实际的数据来看，设计中layout嵌套深度超过10层，就应该考虑下优化了，否则就会出现java.lang.StackOverflowError的crash了。
三、错误详细日志
E/AndroidRuntime( 5196): FATAL EXCEPTION: main
E/AndroidRuntime( 5196): java.lang.StackOverflowError
E/AndroidRuntime( 5196): at android.graphics.Paint.measureText(Paint.java:1057)
E/AndroidRuntime( 5196): at android.text.Styled.drawDirectionalRun(Styled.java:267)
E/AndroidRuntime( 5196): at android.text.Styled.measureText(Styled.java:430)
E/AndroidRuntime( 5196): at android.text.Layout.measureText(Layout.java:1655)
E/AndroidRuntime( 5196): at android.text.Layout.getLineMax(Layout.java:689)
E/AndroidRuntime( 5196): at android.text.Layout.draw(Layout.java:340)
E/AndroidRuntime( 5196): at android.widget.TextView.onDraw(TextView.java:4050)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6740)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.view.View.buildDrawingCache(View.java:6502)
E/AndroidRuntime( 5196): at android.view.View.getDrawingCache(View.java:6288)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1565)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.widget.AbsListView.dispatchDraw(AbsListView.java:1365)
E/AndroidRuntime( 5196): at android.widget.ListView.dispatchDraw(ListView.java:3046)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6846)
E/AndroidRuntime( 5196): at android.widget.AbsListView.draw(AbsListView.java:2257)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1638)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at android.view.ViewGroup.drawChild(ViewGroup.java:1640)
E/AndroidRuntime( 5196): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1367)
E/AndroidRuntime( 5196): at android.view.View.draw(View.java:6743)
E/AndroidRuntime( 5196): at android.widget.FrameLayout.draw(FrameLayout.java:352)
E/AndroidRuntime( 5196): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1842)
E/AndroidRuntime( 5196): at android.view.ViewRoot.draw(ViewRoot.java:1407)
E/AndroidRuntime( 5196): at
W/ActivityManager( 71): Force finishing activity com.baidu.test/.CloudDemActivity
W/WindowManager( 71): No window to dispatch pointer action 1
