Android Kotlin - Material 底部导航禁用 Shift 模式和选择菜单

Question

1. 我想用 kotlin 禁用 Shift 模式，我使用了 material BottomNavigationView

    <com.google.android.material.bottomnavigation.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom"
    app:itemIconSize="@dimen/iconSize"
    android:background="?android:attr/windowBackground"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:menu="@menu/btm_nav_menu"
    app:labelVisibilityMode="labeled"
    />
   

2. 我想单击帐户图标并开始activity单击后退按钮时登录 homeFragment 将被选中而不是帐户图标被选中

   bottom_navigation.setOnNavigationItemSelectedListener {
        when(it.itemId) {
            R.id.homeFragment -> showNav(HomeFragment())
            R.id.accountFragment -> { bottom_navigation.menu.findItem(R.id.homeFragment).setCheckable(true)
                startActivity(Intent(this, MainActivity2::class.java)) }
        }
        true
   }
   
   
   fun showNav(fragment: Fragment){ 
        supportFragmentManager.beginTransaction().apply {
              replace(R.id.fragment_container, fragment)
              commit()
        }
   }
   

Answer 1

回答2。使用false，底部导航不会select图标

bottom_navigation.setOnNavigationItemSelectedListener {
        when(it.itemId) {
            R.id.homeFragment -> {
                showNav(HomeFragment())
                true
            }
            R.id.accountFragment -> {
                startActivity(Intent(this, MainActivity2::class.java))
                false
            } else -> true
        }
    }