baseAdapter

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <ListView
        android:id="@+id/myList"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

利用代码添加baseAdapter

package com.example.adapter

import android.graphics.Color
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.View
import android.view.ViewGroup
import android.widget.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val myList = findViewById<ListView>(R.id.myList)
        val adapter = object : BaseAdapter() {
            override fun getCount(): Int {
                // 指定一共包含40个选项
                return 40
            }

            override fun getItem(position: Int): Any? {
                return null
            }

            // 重写该方法，该方法的返回值将作为列表项的ID
            override fun getItemId(position: Int): Long {
                return position.toLong()
            }

            // 重写该方法，该方法返回的View将作为列表框
            override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
                // 创建一个LinearLayout，并向其中添加两个组件
                val linearLinearLayout = LinearLayout(this@MainActivity)
                linearLinearLayout.orientation = LinearLayout.HORIZONTAL
                val image = ImageView(this@MainActivity)
                image.setImageResource(R.mipmap.ic_launcher)
                val text = TextView(this@MainActivity)
                text.text = "第" + (position + 1) + "个列表项"
                text.textSize = 20f
                text.setTextColor(Color.RED)
                linearLinearLayout.addView(image)
                linearLinearLayout.addView(text)
                // 返回LinearLayout实例
                return linearLinearLayout
            }
        }
        myList.adapter = adapter
    }
}