如何在 NavHostFragment 中检索当前片段? [英] How I can retrieve current fragment in NavHostFragment?

问题描述

我试图在新的导航组件中找到一个方法，但我没有找到任何关于它的方法.

I tried to find a method in the new Navigation components but I didn't find anything about that.

我有当前目的地:

mainHostFragment.findNavController().currentDestination

但我无法获得对显示片段的任何引用.

But I can't get any reference to the displayed fragment.

推荐答案

引用显示的片段(AndroidX):

Reference to the displayed fragment (AndroidX):

Java

public Fragment getForegroundFragment(){
    Fragment navHostFragment = getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);
    return navHostFragment == null ? null : navHostFragment.getChildFragmentManager().getFragments().get(0);
}

科特林

val navHostFragment: Fragment? =
        supportFragmentManager.findFragmentById(R.id.nav_host_fragment)
navHostFragment?.childFragmentManager?.fragments?.get(0)

这里 nav_host_fragment 是一个 ID使用 android:name="androidx.navigation.fragment.NavHostFragment"

Here nav_host_fragment is an ID of the fragment tag in your activity_main.xml with android:name="androidx.navigation.fragment.NavHostFragment"

这篇关于如何在 NavHostFragment 中检索当前片段?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！