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Kotlin初体验

这两天看都在讨论Kotlin，也来试试，感觉不错，是更精简方便了。重要是可以用IDE，这两天看Python头疼，但它却自动转换！！冲这一点就牛B，更别说更方便响应式编写

给Android Studio安装Kotlin

File->Setitngs->Plugins->搜索Kotlin进行安装->重启Android Studio

新建Android Studio工程

将MainActivity转换为Kontlin语言

ctrl+shift+a->输入Convert Java F，选择Convert Java File to Kontlin File

ctrl+shift+a->输入configure k，选择Configure Kontlin in Project

这两条更新要一些时间，更新完之后就可以运行了

Code

  • MainActivity.kt
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package com.xuie.kotlindemo

import android.os.Bundle
import android.support.design.widget.FloatingActionButton
import android.support.design.widget.Snackbar
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.Toolbar
import android.view.Menu
import android.view.MenuItem

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val toolbar = findViewById(R.id.toolbar) as Toolbar
        setSupportActionBar(toolbar)

        val fab = findViewById(R.id.fab) as FloatingActionButton
        fab.setOnClickListener { view -> Snackbar.make(view, "Replace with your own action, I'm kotlin", Snackbar.LENGTH_LONG).setAction("Action", null).show() }
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        val id = item.itemId

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true
        }

        return super.onOptionsItemSelected(item)
    }
}
  • app/build.gradle
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apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.xuie.kotlindemo"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
}
buildscript {
    ext.kotlin_version = '1.0.0'
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}
repositories {
    mavenCentral()
}

参考

https://kotlinlang.org/docs/tutorials/kotlin-android.html
http://blog.jetbrains.com/kotlin/2013/08/working-with-kotlin-in-android-studio/

文章作者: 二十I邊界
文章链接: https://xuie0000.com/post/2016-02-18-2019/Kotlin初体验.html
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Kotlin