Android 如何侦听导航组件中的片段更改?
如何在新的导航组件中添加片段更改侦听器 我有一个BottomNavigationView,在其中我使用了以下新的导航组件 我的Android 如何侦听导航组件中的片段更改?,android,android-fragments,android-architecture-navigation,Android,Android Fragments,Android Architecture Navigation,如何在新的导航组件中添加片段更改侦听器 我有一个BottomNavigationView,在其中我使用了以下新的导航组件 我的底部导航视图中有四个目的地,它们都有导航图 val navGraphIds = listOf(R.navigation.nav_home, R.navigation.nav_discover, R.navigation.nav_search, R.navigation.nav_my) val controller = bottom_nav.setupWithNavCon
底部导航视图中有四个目的地,它们都有导航图
val navGraphIds = listOf(R.navigation.nav_home, R.navigation.nav_discover, R.navigation.nav_search, R.navigation.nav_my)
val controller = bottom_nav.setupWithNavController(
navGraphIds = navGraphIds,
fragmentManager = supportFragmentManager,
containerId = R.id.navHostContainer,
intent = intent
)
controller.observe(this, Observer { navController ->
setupActionBarWithNavController(navController)
})
当4个导航图中的任何一个发生片段更改时,我希望在我的main活动中有一个侦听器
控制器
仅在底部导航视图
目的地之间切换时有效。您是否尝试过导航控制器。OnDestinationChangedListener
private lateinit var controller: NavController // don't forget to initialize
private val listener = NavController.OnDestinationChangedListener { controller, destination, arguments ->
// react on change
// you can check destination.id or destination.label and act based on that
}
override fun onResume() {
super.onResume()
controller.addOnDestinationChangedListener(listener)
}
override fun onPause() {
controller.removeOnDestinationChangedListener(listener)
super.onPause()
}
//不要忘记初始化-->部分将是navController=Navigation.findNavController(这是R.id.nav\u主机\u片段)
,其中nav\u主机\u片段是包含app:navGraph=“@Navigation/mobile\u Navigation”