[移动开发]Start with Kotlin

1 online developer

https://developer.android.com/training/kotlinplayground?

2? ?use?IntelliJ IDEA?

fun main(args: Array<String>) {
    println("Hello World!")

    // Try adding program arguments at Run/Debug configuration
    println("Program arguments: ${args.joinToString()}")
}

it works.

fun main(args: Array<String>) {
    val age  =40
    val Border ="%"
    println("Hello World!")

    // Try adding program arguments at Run/Debug configuration
   // println("Program arguments: ${args.joinToString()}")
    println("Hello world")
    println("You are already ${age}!")
    println("${age} is the very best age to celebrate!")
    printBorder(Border,23)
}
fun printBorder(Border:String, RepeatTimes:Int){
    repeat(RepeatTimes){
        print(Border)
    }
}

?

Add class

3 Android Studio

?if graddle is not installed,?

1. Right click on launcher icon of Android Studio
2. Click on "Run as administrator"

or fix at?Graddle fixer

Problems：

? ?1.?jdk? .? install the newest version, and set path variable.?

? ? ?Add the location of the?bin?folder of the JDK installation to the?PATH?variable in?System Variables

?2 sdk lackness : download.

?3 Graddle can't run , even 　I have download and set its path ,but it doesn't work, only when the AS download it and fix.

4??haxm-7.7.0-setup.exe.? ?download it . and Enable BIOS? "Virtualization Technology" , then install it.

NOw , Ｉ　can build the project.

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