java.lang.IllegalStateException: Failure saving state: active has cleared index in fragment

Question

First, my app has structure like this:

 SpashActivity -> MainActivity -> switching between many fragments

My app use SlideMenu to switch

Answer 1

The state of your fragments is automatically saved and restored, there is no need to do anything in your onSaveInstanceState method. Don't hold any references to your Fragments in your Activity (in your case currentFragment, mContent), if you need a certain Fragment, get it from FragmentManager by e.g. findFragmentByTag.