观察jetpack的生命周期组成导航器以获得当前的屏幕名称

Question

因为Jetpack导航中没有使用片段，所以我想观察Jetpack navigator的生命周期，以获得当前目的地或屏幕名称。正如您所知，Jetpack导航不是使用碎片，而是使用深度链接结构。我找了很多，但找不到合适的解决方案。

我想获得我的sdk的路线或目的地名称，以跟踪屏幕流。

class AppLifeCycleObserver : Application.ActivityLifecycleCallbacks {
var route: String? = ""
override fun onActivityCreated(p0: Activity, p1: Bundle?) {
log("onActivityCreated")
}
val TAG = "AppLifeCycleObserver"
fun log(message: String) {
Log.e(TAG, message)
}
override fun onActivityStarted(p0: Activity) {
log("onActivityStarted")
if (p0 is FragmentActivity) {
p0.supportFragmentManager.registerFragmentLifecycleCallbacks(object :
FragmentManager.FragmentLifecycleCallbacks() {
override fun onFragmentCreated(
fm: FragmentManager,
f: Fragment,
savedInstanceState: Bundle?
) {
super.onFragmentCreated(fm, f, savedInstanceState)
log("onFragmentCreated")
}

override fun onFragmentDestroyed(fm: FragmentManager, f: Fragment) {
super.onFragmentDestroyed(fm, f)
log("onFragmentDestroyed")
}
}, true)
} else if (p0 is ComponentActivity) {
(p0 as MasterActivity).navController_field.currentBackStackEntry.destination.route
log("ComponentActivity")
}
}
override fun onActivityResumed(p0: Activity) {
log("onActivityResumed")
}
override fun onActivityPaused(p0: Activity) {
log("onActivityPaused")
}
override fun onActivityStopped(p0: Activity) {
log("onActivityStopped")
}
override fun onActivitySaveInstanceState(p0: Activity, p1: Bundle) {
}
override fun onActivityDestroyed(p0: Activity) {
log("onActivityDestroyed")
}

}

我无法访问

(p0 as MasterActivity).navController_field.currentBackStackEntry.destination.route

因为这是不可访问的，我通过调试找到了它

Answer 1

navController初始化不必是活动的公共字段。在谷歌文档中，用户需要在活动setContent((中调用rememberNavController()，仅此而已

因此，也许你可以要求SDK的用户提供navHostController作为初始化参数，或者这不是一个选项？