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NullPointerException When Click Back Button After Rotate Screen #65

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IbrahimDisouki opened this issue Feb 26, 2017 · 4 comments
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@IbrahimDisouki
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Library version: 3.3.0.
Android version: 4.4.2.
Steps to reproduce the issue:
1- Open app.
2- Click "GO TO ADVANCEDVIEW" button.
3- Rotate screen.
4- Click back button.
02-26 14:32:48.588 27056-27056/com.shipdream.lib.android.mvc.samples.simple.mvp E/AndroidRuntime: FATAL EXCEPTION: main Process: com.shipdream.lib.android.mvc.samples.simple.mvp, PID: 27056 java.lang.NullPointerException at android.support.v4.app.FragmentState.instantiate(Fragment.java:104) at android.support.v4.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:2736) at android.support.v4.app.Fragment.restoreChildFragmentState(Fragment.java:1287) at android.support.v4.app.Fragment.onCreate(Fragment.java:1260) at com.shipdream.lib.android.mvc.MvcFragment.onCreate(MvcFragment.java:153) at android.support.v4.app.Fragment.performCreate(Fragment.java:2172) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1243) at android.support.v4.app.FragmentManagerImpl.moveFragmentsToInvisible(FragmentManager.java:2323) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2136) at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2092) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1998) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:709) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5602) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) at dalvik.system.NativeStart.main(Native Method)

@IbrahimDisouki
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Hi Kejun,
Could you help me to fix this issue ?

@kejunxia
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kejunxia commented Mar 15, 2017 via email

@IbrahimDisouki
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Any updates ?

@kejunxia
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The issue could be caused by a come and go bug reported for a long time in here
https://issuetracker.google.com/issues/37122334
and here
https://issuetracker.google.com/issues/37000979

In earlier version of AndroidMvc there was a hack to work around the Android support library issue above. And then the issue was fixed, but reintroduced again. Hope the issue will be fixed in future support library.

Solution
Try downgrade the Android support lib to 25.0.1 and earlier AndroidMvc lib

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