Does anyone meet this problem when quit from an activity contains
GuidedStepFragment, it crashes due to an NPE:
E/AndroidRuntime(13363): java.lang.NullPointerException: Attempt to read
from field 'int android.app.Fragment.mContainerId' on a null object
reference
E/AndroidRuntime(13363): at
android.app.BackStackRecord$1.onPreDraw(BackStackRecord.java:1131)
E/AndroidRuntime(13363): at
android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
E/AndroidRuntime(13363): at
android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1970)
E/AndroidRuntime(13363): at
android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
E/AndroidRuntime(13363): at
android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
E/AndroidRuntime(13363): at
android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
E/AndroidRuntime(13363): at
android.view.Choreographer.doCallbacks(Choreographer.java:580)
E/AndroidRuntime(13363): at
android.view.Choreographer.doFrame(Choreographer.java:550)
E/AndroidRuntime(13363): at
android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
E/AndroidRuntime(13363): at
android.os.Handler.handleCallback(Handler.java:739)
E/AndroidRuntime(13363): at
android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(13363): at android.os.Looper.loop(Looper.java:135)
E/AndroidRuntime(13363): at
android.app.ActivityThread.main(ActivityThread.java:5254)
E/AndroidRuntime(13363): at java.lang.reflect.Method.invoke(Native
Method)
E/AndroidRuntime(13363): at
java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime(13363): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
E/AndroidRuntime(13363): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
But if I change the library back to 23.0.1, this issue cannot be reproduced.
The code is very simple:
public class RcuListActivity extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GuidedStepFragment.add(getFragmentManager(), new SettingtFragment());
}
public static class SettingtFragment extends GuidedStepFragment {
@NonNull
@Override
public GuidanceStylist.Guidance onCreateGuidance(Bundle
savedInstanceState) {
String title = "RCU List";
String desc = "List of connected RCUs";
Drawable icon = getActivity().getDrawable(R.drawable.ic_launcher);
return new GuidanceStylist.Guidance(title, desc, "", icon);
}
}
}
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