Android之提示错误Can not perform this action after onSaveInstanceState

1 问题

主页面3个Fragment，在第三个Fragment里面开启了Activity之后，然后想跳到第一个Fragment代码如下

    /**     * 展示Fragment     */    private fun showFragment(fragment: Fragment) {        if (currentFragment !== fragment) {            val transaction: FragmentTransaction = supportFragmentManager.beginTransaction()            transaction.hide(currentFragment)            currentFragment = fragment            if (!fragment.isAdded) {                transaction.add(R.id.mainFrameLayout, fragment).show(fragment).commit()            } else {                transaction.show(fragment).commit()            }        }    }

然后奔溃错误提示如下

    java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState        at androidx.fragment.app.FragmentManagerImpl.checkStateLoss(FragmentManagerImpl.java:1536)        at androidx.fragment.app.FragmentManagerImpl.enqueueAction(FragmentManagerImpl.java:1558)        at androidx.fragment.app.BackStackRecord.commitInternal(BackStackRecord.java:317)        at androidx.fragment.app.BackStackRecord.commit(BackStackRecord.java:282)        at com.appsinnova.android.keepdrop.home.MainActivity.showFragment(MainActivity.kt:671)        at com.appsinnova.android.keepdrop.home.MainActivity.updateMain(MainActivity.kt:286)        at java.lang.reflect.Method.invoke(Native Method)        at org.greenrobot.eventbus.EventBus.invokeSubscriber(EventBus.java:507)        at org.greenrobot.eventbus.EventBus.postToSubscription(EventBus.java:434)        at org.greenrobot.eventbus.EventBus.postSingleEventForEventType(EventBus.java:411)        at org.greenrobot.eventbus.EventBus.postSingleEvent(EventBus.java:384)        at org.greenrobot.eventbus.EventBus.post(EventBus.java:265)        at org.greenrobot.eventbus.EventBus.postSticky(EventBus.java:306)        at com.appsinnova.android.keepdrop.fragment.MyVedioLikeListFragment$onCreateView$1.onClick(MyVedioLikeListFragment.kt:70)        at android.view.View.performClick(View.java:6659)        at android.view.View.performClickInternal(View.java:6631)        at android.view.View.access$3100(View.java:790)        at android.view.View$PerformClick.run(View.java:26187)        at android.os.Handler.handleCallback(Handler.java:907)        at android.os.Handler.dispatchMessage(Handler.java:105)        at android.os.Looper.loop(Looper.java:216)        at android.app.ActivityThread.main(ActivityThread.java:7625)        at java.lang.reflect.Method.invoke(Native Method)        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)

2 解决办法

onSaveInstanceState方法是在该Activity即将被销毁前调用，来保存Activity数据的，如果在保存玩状态后再给它添加Fragment就会出错。解决办法就是把commit（）方法替换成 commitAllowingStateLoss()

    fun newshowFragment(fragment: Fragment) {        if (currentFragment !== fragment) {            val transaction: FragmentTransaction = supportFragmentManager.beginTransaction()            transaction.hide(currentFragment)            currentFragment = fragment            if (!fragment.isAdded) {                transaction.add(R.id.mainFrameLayout, fragment).show(fragment).commitAllowingStateLoss()            } else {                transaction.show(fragment).commitAllowingStateLoss()            }        }    }

1 问题

2 解决办法

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