java.lang.IllegalStateException: Fragment no longer exists for key f#0: unique id de59a648-c55c-43e

日志

07-06 17:28:55.117 W/System.err(  689): java.lang.IllegalStateException: Fragment no longer exists for key f#0: unique id de59a648-c55c-43e0-9c70-6b248931a067
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.getFragment(FragmentManagerImpl.java:365)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.viewpager2.adapter.FragmentStateAdapter.restoreState(FragmentStateAdapter.java:549)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.viewpager2.widget.ViewPager2.restorePendingState(ViewPager2.java:350)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.viewpager2.widget.ViewPager2.dispatchRestoreInstanceState(ViewPager2.java:375)
07-06 17:28:55.118 W/System.err(  689): 	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3827)
07-06 17:28:55.118 W/System.err(  689): 	at android.view.View.restoreHierarchyState(View.java:18586)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:548)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:907)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManagerImpl.java:1238)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManagerImpl.java:1303)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:439)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.executeOps(FragmentManagerImpl.java:2079)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManagerImpl.java:1869)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManagerImpl.java:1824)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManagerImpl.java:1727)
07-06 17:28:55.118 W/System.err(  689): 	at androidx.fragment.app.FragmentManagerImpl$2.run(FragmentManagerImpl.java:150)
07-06 17:28:55.118 W/System.err(  689): 	at android.os.Handler.handleCallback(Handler.java:873)
07-06 17:28:55.118 W/System.err(  689): 	at android.os.Handler.dispatchMessage(Handler.java:99)
07-06 17:28:55.118 W/System.err(  689): 	at android.os.Looper.loop(Looper.java:193)
07-06 17:28:55.118 W/System.err(  689): 	at android.app.ActivityThread.main(ActivityThread.java:6718)
07-06 17:28:55.118 W/System.err(  689): 	at java.lang.reflect.Method.invoke(Native Method)
07-06 17:28:55.119 W/System.err(  689): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
07-06 17:28:55.119 W/System.err(  689): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

解决方法：

把你的viewPage状态保存设为false即可

 viewPager.setSaveEnabled(false);