直播软件app开发，显示和隐藏 Bottom Navigation bar

1、定义viewbinding变量，初始化，并设置界面

定义变量：

1	`<br>` `private` `lateinit` `var` `binding: ActivityFavDishBinding`

初始化并将布局设置给activity：

<br> <br>        binding = ActivityFavDishBinding.inflate(layoutInflater)<br>        setContentView(binding.root)

2、定义controller变量并初始化

定义变量

1	`<br>` `private` `lateinit` `var` `mNavController : NavController`

初始化

<br>  mNavController = findNavController(R.id.nav_host_fragment_activity_fav_dish)

3、为actionbar设置controller

<br>        setupActionBarWithNavController(mNavController, appBarConfiguration)<br>        navView.setupWithNavController(mNavController)

4、隐藏底部导航栏

<br> fun hideBottomNavigationView(){<br>        mBinding.navView.clearAnimation()<br>        mBinding.navView.animate().translationY(mBinding.navView.height.toFloat()).duration = 300<br>    }

5、显示底部导航栏

<br>    fun showBottomNavigationView(){<br>        mBinding.navView.clearAnimation()<br>        mBinding.navView.animate().translationY(0f).duration = 300<br>    }

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