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POAndroid FragmentManager: getBackStackEntryCount() and popBackStack()
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copied!<p>I have a method to remove all backstack</p> <pre><code>public void removeAllInBackStack(FragmentManager fm) { int len = fm.getBackStackEntryCount(); for (int i = 0; i < len; i++) { fm.popBackStack(null,FragmentManager.POP_BACK_STACK_INCLUSIVE); } } </code></pre> <p>But when I run it. Value of len is always > 0 , but popBackStack have java.lang.NullPointerException.</p> <p>I tried width popBackStack() and popBackStack(id,FragmentManager.POP_BACK_STACK_INCLUSIVE).</p> <p>This is logcat:</p> <pre><code>android.app.BackStackRecord.popFromBackStack(BackStackRecord.java:676) android.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1496) android.app.FragmentManagerImpl$3.run(FragmentManager.java:464) android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1401) android.app.Activity.performResume(Activity.java:5076) android.app.ActivityThread.performResumeActivity(ActivityThread.java:2566) android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2604) android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238) android.os.Handler.dispatchMessage(Handler.java:99) android.os.Looper.loop(Looper.java:137) android.app.ActivityThread.main(ActivityThread.java:4747) java.lang.reflect.Method.invokeNative(Native Method) java.lang.reflect.Method.invoke(Method.java:511) com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) dalvik.system.NativeStart.main(Native Method) </code></pre>

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