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
}
}
完毕。