如何使用 AppBarConfiguration 设置 NavigationView?

How to set NavigationView with AppBarConfiguration?

我是导航新手,我在导航组件中的起始目的地与我的首选目的地不同,所以我使用 AppBarConfiguration 来使用自定义首选目的地,但是当我想将 NavigationView 设置为 navController 使用 NavigationUI.setupWithNavController(binding.navView, navController) 设置带有抽屉项目的导航组件,但是当我在导航抽屉中按下一个项目时,应用程序无法识别我的自定义顶级目的地,导航到不同的片段并按下后退按钮导航回顶级目的地。它向我显示了起始目的地,但我想查看自定义的首选目的地 这是他们的主要 activity 代码:

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.databinding.DataBindingUtil
import androidx.drawerlayout.widget.DrawerLayout
import androidx.navigation.NavController
import androidx.navigation.NavDestination
import androidx.navigation.findNavController
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.NavigationUI
import com.example.android.pass.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    private lateinit var drawerLayout: DrawerLayout
    private lateinit var appBarConfiguration: AppBarConfiguration
    private lateinit var binding: ActivityMainBinding
    private lateinit var navController: NavController
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setTheme(R.style.AppTheme)
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)

        val toolbar= binding.toolbar
        drawerLayout = binding.drawerLayout
        navController = this.findNavController(R.id.myNavHostFragment)
        setSupportActionBar(toolbar)
        navController
            .addOnDestinationChangedListener { nc: NavController, nd: NavDestination, args: Bundle? ->
                if (nd.id == R.id.accountListFragment) {
                drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
                } else {
                    drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
                }
            }

        val topLevelDestinations = setOf(R.id.accountListFragment)
        appBarConfiguration = AppBarConfiguration.Builder(topLevelDestinations)
            .setDrawerLayout(drawerLayout)
            .build()
        NavigationUI.setupWithNavController(binding.navView, navController)
        NavigationUI.setupWithNavController(toolbar,navController,appBarConfiguration)
    }
    override fun onSupportNavigateUp(): Boolean {
        return NavigationUI.navigateUp(navController,appBarConfiguration)
    }
}

这是我的抽屉菜单,其中有两个项目的 ID 与我要导航的片段相同:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <item
        android:id="@+id/aboutFragment"
        android:icon="@drawable/question"
        android:title="About" />
    <item
        android:id="@+id/settingsFragment"
        android:icon="@drawable/settings"
        android:title="settings" />
</menu>

使用这个:

AppBarConfiguration appBarConfiguration =
        new AppBarConfiguration.Builder(navController.getGraph()).build();

而不是:

appBarConfiguration = AppBarConfiguration.Builder(topLevelDestinations)

我找到了答案,而不是使用以下代码将 navigationView 设置为 navControllerNavigationUI.setupWithNavController(binding.navView, navController) 我在主要 activity:

中使用了以下代码
binding.navView.setNavigationItemSelectedListener(this)

override fun onNavigationItemSelected(item: MenuItem): Boolean {

    when (item.itemId) {
        R.id.about_item -> navController.navigate(R.id.aboutFramgent)
        R.id.settings_item -> navController.navigate(R.id.settingsFramgent)
    }

    return true
}