kotlin-jetpack-navigation 动态管理fragment

流程关键点

（1）/res/navigation/xxx.xml中，关闭 app:startDestination 属性
（2）act的oncreate中，加入动态判断代码：

when (projectType)) {
     
            0 -> {
     //图书馆项目，启动测温页
                LogUtils.d(TAG, "预约通用项目")
                var navHostFragment: NavHostFragment =
                    supportFragmentManager.findFragmentById(R.id.fragment_container) as NavHostFragment//找到容器
                val navGraph =
                    navHostFragment.navController.navInflater.inflate(R.navigation.nav_base)//绑定nav布局
                navGraph.startDestination = R.id.temp_main//设置启动页
                navHostFragment.navController.graph = navGraph  //启动
            }
            1 -> {
     // 
                LogUtils.d(TAG, "核酸项目")
                var navHostFragment: NavHostFragment =
                    supportFragmentManager.findFragmentById(R.id.fragment_container) as NavHostFragment//找到容器
                val navGraph =
                    navHostFragment.navController.navInflater.inflate(R.navigation.nav_base)//绑定nav布局
                navGraph.startDestination = R.id.card_main//设置启动页
                navHostFragment.navController.graph = navGraph  //启动
            }
            2 -> {
     // 
                LogUtils.d(TAG, "医院流调表项目")
            }
        }