关于android:Android进阶Kotlin实现listview

1.实现效果图： 其实总体和java也差不多的  就是局部写法略微有点变动，更加简洁了  写代码更不便了

2.适配器：

package com.example.admin.zkotlinimport android.content.Contextimport android.graphics.Colorimport android.support.v7.app.AppCompatActivityimport android.os.Bundleimport android.view.LayoutInflaterimport android.view.Viewimport android.view.ViewGroupimport android.widget.BaseAdapterimport 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：

//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>