底部导航消失了

如何解决底部导航消失了

我在主活动中创建了一个底部导航，但是，我想让它在一个片段中消失。如何让我的底部导航消失？

班级主要活动

class MainActivity : AppCompatActivity() {
    private val controlador by lazy {
        findNavController(R.id.pokemons_activity_nav_host)
    }

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.main_activity)
    configNavControler()

}

private fun configNavControler() {
    val navView: BottomNavigationView = findViewById(R.id.main_activity_bottom_navigation)
    val navHostFragment = supportFragmentManager
        .findFragmentById(R.id.pokemons_activity_nav_host) as NavHostFragment
    val navController = navHostFragment.navController

    navView.setupWithNavController(navController)
  }
}

我不希望底部导航出现的片段类

class EnTradaFragment : Fragment() {
private val controlador by lazy {
    findNavController()
}
override fun onCreateView(
    inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
): View? {
    return inflater.inflate(
        R.layout.enTrada,container,false
    )

}

override fun onViewCreated(view: View,savedInstanceState: Bundle?) {
    super.onViewCreated(view,savedInstanceState)

    botao_entrar.setonClickListener {
        val direcao = EnTradaFragmentDirections.acaoEnTradaParaListaPokemons()
        controlador.navigate(direcao)
    }
  }
}

解决方法

首先从您的片段访问您的 private const string CONNECTION_STRING = "myConnectionString"; ，如下所示：

BottommNavigationView

然后你可以像这样隐藏它：

var nav = getActivity().findViewById(R.id.main_activity_bottom_navigation)

,

.as-console-wrapper { top: 0; max-height: 100% !important; } 属性包含主要片段的 ID。当导航改变时，导航控制器的侦听器被调用，在那里你改变底部导航视图的可见性。

topDestinationIds