Settings Screen crashing on screen rotation

[kaushiknsanji]

The Settings in this app has been setup to adjust the parameters used in generating the Search URL of the Google Books API, embedding the search keyword entered by the user, for the Book to be searched. This has been designed using the android.support.v7.preference.Preference.

The Setting screen can be launched by going over to the overflow menu in the main activity, and then by clicking on the "Search Settings" menu as shown in the above GIF. After the Settings screen is launched, just rotate the device screen, and the following error will be seen in the logs -

10-26 20:13:11.091 3966-3987/com.example.kaushiknsanji.bookslibrary D/OpenGLRenderer: endAllActiveAnimators on 0x8d267a80 (MenuPopupWindow$MenuDropDownListView) with handle 0x8d7a2c20
10-26 20:13:13.998 3966-3966/com.example.kaushiknsanji.bookslibrary D/AndroidRuntime: Shutting down VM
                                                                                      
                                                                                      
                                                                                      --------- beginning of crash
10-26 20:13:13.999 3966-3966/com.example.kaushiknsanji.bookslibrary E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                      Process: com.example.kaushiknsanji.bookslibrary, PID: 3966
                                                                                      java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kaushiknsanji.bookslibrary/com.example.kaushiknsanji.bookslibrary.settings.SearchSettingsActivity}: java.lang.IllegalStateException: Derived class did not call super.onRestoreInstanceState()
                                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
                                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
                                                                                          at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4519)
                                                                                          at android.app.ActivityThread.-wrap19(ActivityThread.java)
                                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1483)
                                                                                          at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                                          at android.os.Looper.loop(Looper.java:154)
                                                                                          at android.app.ActivityThread.main(ActivityThread.java:6119)
                                                                                          at java.lang.reflect.Method.invoke(Native Method)
                                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
                                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
                                                                                       Caused by: java.lang.IllegalStateException: Derived class did not call super.onRestoreInstanceState()
                                                                                          at android.support.v7.preference.Preference.dispatchRestoreInstanceState(Preference.java:1726)
                                                                                          at android.support.v7.preference.PreferenceGroup.dispatchRestoreInstanceState(PreferenceGroup.java:395)
                                                                                          at android.support.v7.preference.PreferenceGroup.dispatchRestoreInstanceState(PreferenceGroup.java:395)
                                                                                          at android.support.v7.preference.Preference.restoreHierarchyState(Preference.java:1706)
                                                                                          at android.support.v7.preference.PreferenceFragmentCompat.onActivityCreated(PreferenceFragmentCompat.java:343)
                                                                                          at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:2201)
                                                                                          at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1326)
                                                                                          at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
                                                                                          at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
                                                                                          at android.support.v4.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:2900)
                                                                                          at android.support.v4.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
                                                                                          at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:603)
                                                                                          at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
                                                                                          at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1248)
                                                                                          at android.app.Activity.performStart(Activity.java:6696)
                                                                                          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2628)
                                                                                          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) 
                                                                                          at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4519) 
                                                                                          at android.app.ActivityThread.-wrap19(ActivityThread.java) 
                                                                                          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1483) 
                                                                                          at android.os.Handler.dispatchMessage(Handler.java:102) 
                                                                                          at android.os.Looper.loop(Looper.java:154) 
                                                                                          at android.app.ActivityThread.main(ActivityThread.java:6119) 
                                                                                          at java.lang.reflect.Method.invoke(Native Method) 
                                                                                          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) 
                                                                                          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) 

Let me know how to solve this issue.

[kaushiknsanji]

Call to superclass when the state was never saved, was missing in the onRestoreInstanceState() method of the custom preferences. Issue has been fixed.