android - Material 设计中的底部抽屉

Question

class BottomNavigationDrawerFragment: BottomSheetDialogFragment() {

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    return inflater.inflate(R.layout.fragment_bottomsheet, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    navigation_view.setNavigationItemSelectedListener { menuItem ->
        // Bottom Navigation Drawer menu item clicks
        when (menuItem!!.itemId) {
            R.id.nav1 -> context!!.toast("you clicked one")
            R.id.nav2 -> context!!.toast("you clicked two")
            R.id.nav3 -> context!!.toast("you clicked three")
        }
        true
    }


}

// This is an extension method for easy Toast call
fun Context.toast(message: CharSequence) {
    val toast = Toast.makeText(this, message, Toast.LENGTH_SHORT)
    toast.setGravity(Gravity.BOTTOM, 0, 600)
    toast.show()
}

}

我想要实现的是在单击底部应用栏中的导航图标后创建一个模态 Bottom Sheet 并在其中显示一个抽屉导航。在上面的代码中我保留了三个项目。到这里一切都还好但是当涉及到处理项目点击部分时，行:

navigation_view.setNavigationItemSelectedListener { menuItem -> 

显示错误。它告诉:

unresolved type:setNavigationItemSelectedListener

和未解析的类型:menuItem

这是fragment_bottomsheet.xml:

<android.support.design.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigation_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:menu="@menu/bottom_nav_drawer_menu"/>

</android.support.design.widget.ConstraintLayout>

我在这里做错了什么？

Answer 1

问题似乎来自 Context.toast(message: CharSequence)，您可以为此使用 anko:

implementation "org.jetbrains.anko:anko:0.10.6"

---

无论如何，您可以通过以下方式检查输出:

Toast.makeText(context, "Clicked", Toast.LENGTH_LONG).show()

你会发现它会起作用。

更新:

尝试在您的 BottomNavigationDrawerFragment 中使用它:

 override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)

        navigation_view.setNavigationItemSelectedListener { menuItem ->
            // Bottom Navigation Drawer menu item clicks
            when (menuItem.itemId) {

                R.id.home ->{

                    Toast.makeText(context, "Clicked", Toast.LENGTH_LONG).show()
                }
//                R.id.nav1 -> context!!.toast(getString(R.string.nav1_clicked))
            }
            // Add code here to update the UI based on the item selected
            // For example, swap UI fragments here
            true
        }

        close_imageview.setOnClickListener {
            this.dismiss()
        }

        disableNavigationViewScrollbars(navigation_view)

    }