Kotlin 无法扩充布局

Question

我正在构建一个 GridView 的应用程序，其中包含动态数量的 CardView。我在从我创建的自定义适配器访问单个项目布局中的 TextView 元素时遇到问题。

tvCastleName 和 tvShieldTime 是未解析的引用，应用程序将无法编译。

main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.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">


    <TextView
        android:id="@+id/tvNickname"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fontFamily="sans-serif-medium"
        android:text="Nickname"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        android:textSize="24sp"
        app:layout_constraintTop_toTopOf="parent" />

    <GridView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/tvNickname"
        android:horizontalSpacing="6dp"
        android:verticalSpacing="6dp"
        android:numColumns="3"
        android:id="@+id/gvCastles" />

items.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_gravity="center"
    android:layout_margin="5dp"
    app:cardElevation="5dp">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/tvCastleName"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            android:fontFamily="sans-serif-medium"
            android:text="Castle Name"
            android:gravity="center"
            android:textAppearance="@style/TextAppearance.AppCompat.Large" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_constraintTop_toBottomOf="@+id/tvCastleName"
            android:text="15:00"
            android:id="@+id/tvShieldTime"
            android:gravity="center" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.cardview.widget.CardView>

GridAdapter.kt

import android.content.Context
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter

class GridAdapter(var nameList: ArrayList<Castle>, var context: Context?) : BaseAdapter() {


  override fun getCount(): Int = nameList.size

  override fun getItem(position: Int): Castle = nameList[position]

  override fun getItemId(position: Int): Long {
    TODO("Not yet implemented")
  }

  override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
    val nameList = this.nameList[position]
    var inflater = context!!.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
    val castleView = inflater.inflate(R.layout.items, null)
    castleView.tvCastleName.text = nameList.name!!
    castleView.tvShieldTime.text = "15:00"
    
    return castleView
  }

}

Answer 1

您必须获得 Unresolved Reference，因为您用来访问 view 的方法 (Kotlin Synthetics) 现在是 deprecated。您可以使用 ViewBinding 访问您的 views.

您必须对 getItem 方法进行一些更改，以使其与 ViewBinding

一起使用

override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
    val nameList = this.nameList[position]
    val itemsBinding = ItemsBinding.inflate(LayoutInflater.from(parent.context), parent, false)
    itemsBinding.tvCastleName.text = nameList.name!!
    itemsBinding.tvShieldTime.text = "15:00"        
    return itemsBinding.root
}

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