android-studio - 使用 kotlin 在 android 中创建自定义微调器适配器

Question

我正在尝试使用自定义适配器制作一个微调器来显示带有如下文本的图像

但我有很多 Unresolved reference ，所以我认为我做错了一些事情

我有两个片段，微调器在第二个片段内custome_spinner.xml 为自定义布局文件

安卓工作室 3.1.2

kotlin_version = '1.2.30'

gradle:3.1.2

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

class customeSpinnerAdapter : BaseAdapter{
    override fun getItem(p0: Int): Any {
        return flag.length
    }

    override fun getItemId(p0: Int): Long {
        return null
    }

    override fun getCount(): Int {
        return 0
    }

    val country:String
    val flag:String
     fun customeSpinnerAdapter(context:Context,name:String,image:String){
        this.country = name
        this.flag = image

        val inflater  = LayoutInflater.from(context)
    }
    override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
        val view = inflater.inflate(R.layout.custome_spinner)
        spinner_image.setImageResource(flag)
        spinner_country.setText(country)
        return view
    }
}

custome_spinner.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/spinner_image"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:padding="5dp"
        android:src="@drawable/us" />

    <TextView
        android:id="@+id/spinner_country"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="10dp"
        android:paddingRight="10dp"
        android:layout_gravity="center"
        android:text="Custom Text"
        android:textColor="#000" />

</LinearLayout>

 the widget inside fragment_second.xml 

        <Spinner
            android:id="@+id/spinner"
            android:layout_width="368dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="12dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/from_textView" />

Answer 1

你的问题出在customeSpinnerAdapter.kt

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

class customeSpinnerAdapter : BaseAdapter{
    override fun getItem(p0: Int): Any {
        return flag.length
    }

    override fun getItemId(p0: Int): Long {
        return null
    }

    override fun getCount(): Int {
        return 0
    }

    val country:String
    val flag:String
    //Add this
    val inflater : LayoutInflater

    fun customeSpinnerAdapter(context:Context,name:String,image:String){
        this.country = name
        this.flag = image

        //val inflater  = LayoutInflater.from(context)
        inflater  = LayoutInflater.from(context)
    }
    override fun getView(p0: Int, p1: View?, p2: ViewGroup?): View {
        val view = inflater.inflate(R.layout.custome_spinner)
        spinner_image.setImageResource(flag)
        spinner_country.setText(country)
        return view
    }
}