android.widget.TabWidget.dispatchDraw(TabWidget.java:216)错误分析

java.lang.NullPointerExceptionat android.widget.TabWidget.dispatchDraw(TabWidget.java:216)at android.view.ViewGroup.drawChild(ViewGroup.java:1614)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.View.draw(View.java:6630)at android.view.ViewGroup.drawChild(ViewGroup.java:1616)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.ViewGroup.drawChild(ViewGroup.java:1614)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.ViewGroup.drawChild(ViewGroup.java:1614)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.ViewGroup.drawChild(ViewGroup.java:1614)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.ViewGroup.drawChild(ViewGroup.java:1614)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.View.draw(View.java:6630)at android.widget.FrameLayout.draw(FrameLayout.java:356)at android.view.ViewGroup.drawChild(ViewGroup.java:1616)at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1343)at android.view.View.draw(View.java:6630)at android.widget.FrameLayout.draw(FrameLayout.java:356)at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830)at android.view.ViewRoot.draw(ViewRoot.java:1349)at android.view.ViewRoot.performTraversals(ViewRoot.java:1114)at android.view.ViewRoot.handleMessage(ViewRoot.java:1633)at android.os.Handler.dispatchMessage(Handler.java:99)at android.os.Looper.loop(Looper.java:123)at android.app.ActivityThread.main(ActivityThread.java:4370)at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:521)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)at dalvik.system.NativeStart.main(Native Method)

错误详情：

 

基本上只出现在android 2.1版本的手机上。

 

解决方案：

Call setup() before adding tabs if loading TabHost using findViewById(). However: You do not need to call setup() after getTabHost() in TabActivity. Example:

mTabHost = (TabHost)findViewById(R.id.tabhost);mTabHost.setup();mTabHost.addTab(TAB_TAG_1, "Hello, world!", "Tab 1");

 

 

参考：http://stackoverflow.com/questions/2942108/why-do-i-get-a-null-pointer-exception-from-tabwidget

           http://developer.android.com/reference/android/widget/TabHost.html#setup