防止导航到同一片段 [英] Prevent navigating to the same fragment

问题描述

我正在使用带有BottomNavigationView 的Android 导航jetpack 库.我已经实现了 NavHost、NavGraph 和我的片段.当我使用操作进行导航时，一切都按预期工作.

I'm using Android navigation jetpack library with BottomNavigationView. I have implemented the NavHost, the NavGraph and my fragments. Everything is working as intented when I use actions to navigate.

我使用以下代码来设置一切:

I use the following code to setup everything:

 val navController = Navigation.findNavController(this, R.id.nav_host)
 bottom_navigation.setupWithNavController(navController)

问题是，如果我单击选项卡 2 次，片段将重新创建两次.有没有办法拦截导航?我不想导航到正在显示的同一个片段.

The problem is that if I click a tab 2 times the fragment is recreated twice. Is there any way to intercept navigation? I don't want to navigate to the same fragment that's being shown.

推荐答案

根据 这个问题,

随意设置 OnNavigationItemReselectedListener，它优先于 NavigationUI 设置的 OnNavigationItemSelectedListener.

Feel free to set a OnNavigationItemReselectedListener, which takes precedence over the OnNavigationItemSelectedListener set by NavigationUI.

val navController = Navigation.findNavController(this, R.id.nav_host)
bottom_navigation.setupWithNavController(navController)
bottom_navigation.setOnNavigationItemReselectedListener {
  // Do nothing to ignore the reselection
}

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