java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

原创于 2021-10-26 11:20:55 发布 · 993 阅读

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#java #android #apache

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这篇博客探讨了在Android应用开发中遇到的`IllegalStateException: Cannot perform this action after onSaveInstanceState`错误，该错误通常发生在尝试在Activity保存状态后添加或操作Fragment。解决方案是使用`commitAllowingStateLoss()`代替`commit()`方法来允许在可能损失状态的情况下提交事务。博客还提供了自定义DialogFragment的show()方法示例，以避免此类异常的发生。

Fatal Exception: java.lang.RuntimeException

Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {com.funbit.android/com.blankj.utilcode.util.UtilsTransActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState

Fragment 在显示或者隐藏，移除是出现Can not perform this action after onSaveInstanceState #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()

现在常用的：Dialog , BottomSheetDialogFragment, ,DialogFragment 等在Show()的时候可以重写show()方法，因为系统show()是这样的：

public void show(@NonNull FragmentManager manager, @Nullable String tag) {
    mDismissed = false;
    mShownByMe = true;
    FragmentTransaction ft = manager.beginTransaction();
    ft.add(this, tag);
    ft.commit();
}

自己修改下：

    public void show(@NonNull FragmentManager fragmentManager, @Nullable String tag) {
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(showDialog, tag);
        fragmentTransaction.commitAllowingStateLoss();
    }

最主要的就是将：

ft.commit();改成：

fragmentTransaction.commitAllowingStateLoss();