Kotlin Array 创建、增、删、改、查、插入

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_test.*

/**
 * Array 创建、增、删、改、查、插入
 * @author lyl 20181228
 * */
class ArrayActivity : AppCompatActivity() {

    // 定义Int类型数组
    var itemArr = intArrayOf(1,2,3,4,5,6,7,8)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_test)

        // 初始
        helloArray.text = "初始：" + itemArr.asList().toString() +"\n\n"

        // 添加
        addItem(9)
        helloArray.text = helloArray.text as String + "添加：" + itemArr.asList().toString() +"\n\n"

        // 删除
        deleteItem(0)
        helloArray.text = helloArray.text as String + "删除：" + itemArr.asList().toString() +"\n\n"

        // 修改
        editItem(0,-1)
        helloArray.text = helloArray.text as String + "修改：" + itemArr.asList().toString() +"\n\n"

        // 取值get
        var item:Int = getItem(0)
        helloArray.text = helloArray.text as String + "取值：" + item.toString() +"\n\n"

        // 插入
        insertItem(0,-2)
        helloArray.text = helloArray.text as String + "插入：" + itemArr.asList().toString() +"\n\n"
    }

    /**
     * 增加item
     * @item：需添加数值
     * */
    fun addItem(item:Int){
        var newArr = IntArray(itemArr.size+1)
        for(i in itemArr.indices){
            newArr[i] = itemArr[i]
        }
        newArr[itemArr.size] = item
        itemArr = newArr
    }

    /**
     * 删除item
     * @index：删除位置下标
     * */
    fun deleteItem(index:Int){
        var newArr = IntArray(itemArr.size - 1)
        for(i in newArr.indices){
            if(i < index){
                newArr[i] = itemArr[i]
            }else{
                newArr[i] = itemArr[i + 1]
            }
        }
        itemArr = newArr
    }

    /**
     * 修改item
     * @index：修改位置下标
     * @item：修改后数值
     * */
    fun editItem(index:Int,item:Int){
        itemArr[index] = item
    }

    /**
     * 获取item
     * @index：获取位置下标
     * */
    fun getItem(index:Int):Int{
        return itemArr[index]
    }

    /**
     * 插入item
     * @index：插入位置下标
     * @item：插入位置数值
     * */
    fun insertItem(index:Int,item:Int){
        var newArr = IntArray(itemArr.size + 1)
        for(i in itemArr.indices){
            if(i < index){
                newArr[i] = itemArr[i]
            }else{
                newArr[i + 1] = itemArr[i]
            }
        }
        newArr[index] = item
        itemArr = newArr
    }

}