android-discuss, IllegalStateException: Fragment not added in ActionBarTabs example

 While writing an app that uses Fragments and tabs on the Action Bar I
ran into a crash. I went back to the API Demos sample and can make the
same crash happen there. Start the program in the emulator and select
App > Action Bar > Action Bar Tabs. Click "Toggle tab mode" then "Add
new tab" twice, then click back and forth between the two tabs very
quickly until it crashes. Here's the traceback:


05-19 18:16:06.668: ERROR/AndroidRuntime(1153): FATAL EXCEPTION: main
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):
java.lang.IllegalStateException: Fragment not added:
TabContentFragment{407c55a8 #0 id=0x7f08000c Tab 1}
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.app.BackStackRecord.remove(BackStackRecord.java:366)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.example.android.apis.app.ActionBarTabs
$TabListener.onTabUnselected(ActionBarTabs.java:94)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.android.internal.app.ActionBarImpl.selectTab(ActionBarImpl.java:
476)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.android.internal.app.ActionBarImpl
$TabImpl.select(ActionBarImpl.java:816)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.android.internal.widget.ActionBarView
$TabClickListener.onClick(ActionBarView.java:954)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.view.View.performClick(View.java:3110)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.view.View$PerformClick.run(View.java:11928)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.os.Handler.handleCallback(Handler.java:587)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.os.Handler.dispatchMessage(Handler.java:92)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.os.Looper.loop(Looper.java:132)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
android.app.ActivityThread.main(ActivityThread.java:4025)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
java.lang.reflect.Method.invokeNative(Native Method)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
java.lang.reflect.Method.invoke(Method.java:491)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.android.internal.os.ZygoteInit
$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-19 18:16:06.668: ERROR/AndroidRuntime(1153):     at
dalvik.system.NativeStart.main(Native Method)
05-19 18:16:06.698: WARN/ActivityManager(82):   Force finishing
activity com.example.android.apis/.app.ActionBarTabs

Is this a known problem? I tried it under SDK Platform 3.0 (rev 1) and
3.1 (rev 2).

-- 

 I've run into this on occasion, I surrounded it with a general Exception
catch to handle this, which seemed to have no side affects for my
application, as to whether this is platform bug, who knows? Without the
source code to look at, it is anyone's guess.

Shane





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