Writing our Hello World project in Android studio 3.0.0 using Kotlin and Java.
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apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' android { compileSdkVersion 26 buildToolsVersion "26.0.1" defaultConfig { applicationId "com.technicaljungle.helloworld.hellokotlinworld" minSdkVersion 15 targetSdkVersion 26 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" implementation 'com.android.support:appcompat-v7:26.0.1' implementation 'com.android.support.constraint:constraint-layout:1.0.2' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.0' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.0' } |
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// Top-level build file where you can add configuration options common to all sub-projects/modules. buildscript { ext.kotlin_version = '<strong>1.1.4-2</strong>' repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:<strong>3.0.0-beta3</strong>' classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" // NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files } } allprojects { repositories { google() jcenter() } } task clean(type: Delete) { delete rootProject.buildDir } |
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<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.technicaljungle.helloworld.hellokotlinworld"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".KotlinMainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> |
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package com.technicaljungle.helloworld.hellokotlinworld import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.util.Log import android.widget.TextView import android.widget.Toast import kotlinx.android.synthetic.main.activity_hello_world.* class KotlinMainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_hello_world) //(1) findView by ID // findViewById<TextView>(R.id.textHelloWorld).setText("Hello World Kotlin") //(2) synthetic property textHelloWorld.setText("Hello World Kotlin - synthetic ") Toast.makeText(this, "- Toast - Hello World Kotlin - synthetic ", Toast.LENGTH_SHORT).show() } } |
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package com.technicaljungle.helloworld.kotlinhelloworld; import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.widget.TextView; public class HelloJavaWorld extends AppCompatActivity{ @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_hello); TextView text =(TextView) findViewById(R.id.textHelloWorld); text.setText("Hello World, Welcome Java"); } } |
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<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.technicaljungle.helloworld.hellokotlinworld"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".KotlinMainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest> |