Develop Android's Hello kotlin!! with Kotlin

1 Creating a new project

Android Studio creates a new project with only one empty mainactivity

2 Installing Kotlin

File-seeting-plugins-install jetbrains Plugin input Kotlin installation,

If the installation fails, open the C:\Users\ user \. Androidstudio2.3\system\log\idea.log "This file, find Kotlin

Http://plugins.jetbrains.com/pluginManager/?action=download&id=org.jetbrains.kotlin&build= ai-162.2228.14&uuid=6b417889-78a8-4cc8-ac6c-3e8d64c5a56c

Download to d:\kotlin-plugin-1.1.1-release-Studio2.3-1.zip with IE single thread

Click Install plugin from disk for installation, then restart Studio

3 Configuration

Apply the following build.gradle to add

ext.kotlin_version = ' 1.1.1 '

Classpath "Org.jetbrains.kotlin:kotlin-gradle-plugin: $kotlin _version"

Add two lines to the Build.gradle in the app folder

Apply plugin: ' kotlin-android '

Apply plugin: ' kotlin-android-extensions '

and compile "Org.jetbrains.kotlin:kotlin-stdlib: $kotlin _version"

4 Convert Mainactivity.java to Mainactivity.kt

5

Activity_main.xml Delete the original TextView, add the following

<textview
    Android:id= "@+id/tv"
    Android:layout_width= "Wrap_content"
    android:layout_height= "Wrap_content"
    android:text= "Hello world!"/>

Mainactivity.kt file Additions

Import kotlinx.android.synthetic.main.activity_main.*

Tv.text = "Hello Kotlin"
Tv.textsize = 20.0f

Run!!!!!!!!!!
Have you succeeded?

Develop Android's Hello kotlin!! with Kotlin