1.实现效果图： 其实总体和java也差不多的 就是部分写法稍微有点变化，更加简洁了 写代码更方便了
2.适配器：
代码语言：txt复制package com.example.admin.zkotlin
import android.content.Context
import android.graphics.Color
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.BaseAdapter
import kotlinx.android.synthetic.main.activity_main.*
import kotlinx.android.synthetic.main.list_item_color.view.*
class MainActivity : AppCompatActivity() {
val colors = arrayOf("red","green","blue","cyan",
"mageenta","yellow","black","white"
,"gray","maroon","fuchsia","navy","olive","teal")
val numList = ArrayList<Int>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// 遍历0-1000的数值
for (i in 0..20){
numList.add(i)
}
lvColors.adapter = ColorAdapter(this,numList,colors)
}
class ColorAdapter(val context: Context, val numList: ArrayList<Int>, val colors: Array<String>) : BaseAdapter() {
override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
val li = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater;
val itemView = convertView ?: li.inflate(R.layout.list_item_color,parent,false)
val id = numList[position]
val colorName = colors[position%colors.size]
itemView.tvColor.text = colorName
itemView.tvId.text = id.toString()
return itemView
}
override fun getItem(position: Int): Any? {
return null
}
override fun getItemId(position: Int): Long {
return 0
}
override fun getCount(): Int {
return numList.size
}
}
}3.布局：
代码语言：txt复制//主界面
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@ id/llColorBox"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<ListView
android:id="@ id/lvColors"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
//item界面
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@ id/llColorBox"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="@ id/tvId"
android:layout_width="40dp"
android:layout_height="wrap_content"
android:text="10"
android:textSize="20sp" />
<TextView
android:id="@ id/tvColorText"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:text="BLACK"
android:textSize="20sp" />
<TextView
android:id="@ id/tvColor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="10dp" />
</LinearLayout>
