如何确保设置片段的后退按钮使用 aac 转到启动片段

Question

So I have an issue with AAC navigation. I have multiple fragments in one activity. I inflate the menu options in MainActivity so that each fragment has access to the menu item which opens the settings. The problem is that each time I press the back button on a fragment, it does not go back to the fragment that launched it. It goes back to the original fragment. Is there a way to make sure this behavior is assured? Thanks

Answer 1

If you are calling fragment by menu item id then do it in your activity like below.It will solve your problem.

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return NavigationUI.onNavDestinationSelected(item,navController) || super.onOptionsItemSelected(item)
}

And your menu item:

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:app="http://schemas.android.com/apk/res-auto">
<item
        android:id="@+id/settingsFragment"
        android:title="Settings"
        android:menuCategory="secondary"
        app:showAsAction="never" />

MenuCategory = "secondary" will not pop out back stack to start destination.

Answer 2

You should use a FragmentManager and add the fragment to the BackStack.

I recommend taking a look at this post: Go back to the previous fragment