错误日志：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.newseax.user, PID: 4818
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.unFocus(android.view.View)' on a null object reference
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:5262)
at android.view.ViewGroup.removeViewAt(ViewGroup.java:5225)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1762)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1819)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2590)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2377)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2332)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2239)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:808)
at android.os.Handler.dispatchMessage(Handler.java:101)
at android.os.Looper.loop(Looper.java:166)
at android.app.ActivityThread.main(ActivityThread.java:7406)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:926)
错误日志： E/AndroidRuntime: FATAL EXCEPTION: main Process: com.newseax.user, PID: 4818 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.unFocus(android.view.View)' on a null object reference at android.view.ViewGroup.removeViewInternal(ViewGroup.java:5262) at android.view.ViewGroup.removeViewAt(ViewGroup.java:5225) at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1762) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1819) at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:797) at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2590) at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2377) at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2332) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2239) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700) at android.os.Handler.handleCallback(Handler.java:808) at android.os.Handler.dispatchMessage(Handler.java:101) at android.os.Looper.loop(Looper.java:166) at android.app.ActivityThread.main(ActivityThread.java:7406) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:245) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:926)
非常诡异，暂时还没找到什么原因报错，大佬能分析下吗？