build.gradle (Module: app)
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apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' android { compileSdkVersion 26 defaultConfig { applicationId "com.phaisarn.ktapplication" minSdkVersion 21 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-jdk7:$kotlin_version" implementation 'com.android.support:appcompat-v7:26.1.0' implementation 'com.android.support.constraint:constraint-layout:1.1.3' testImplementation 'junit:junit:4.12' androidTestImplementation 'com.android.support.test:runner:1.0.2' androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' implementation 'org.jetbrains.anko:anko-common:0.8.3' } |
บรรทัดที่ 34 : ใช้ไลบรารี่ anko เพื่อเรียกใช้ toast
activity_main.xml
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<?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:orientation="horizontal"> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button1" /> <Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button2" /> <Button android:id="@+id/button3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button3" /> <Button android:id="@+id/button4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="onClick" android:text="Button4" /> </LinearLayout> </FrameLayout> |
MainActivity.kt
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package com.phaisarn.ktapplication import android.support.v7.app.AppCompatActivity import android.os.Bundle import android.view.View import android.widget.Toast import org.jetbrains.anko.longToast import org.jetbrains.anko.toast class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) } fun onClick(view: View) { when (view.id) { R.id.button1 -> Toast.makeText(applicationContext, "Hello 1", Toast.LENGTH_SHORT).show() R.id.button2 -> toast("Hello 2") R.id.button3 -> toast("Hello 3") R.id.button4 -> longToast("Wow, such a duration") } } } |
บรรทัดที่ 18 : คำสั่ง when
ใช้แทนคำสั่ง switch
ในภาษา java
บรรทัดที่ 18 : ใช้คำสั่ง when
ตรวจสอบ view.id
ว่าเป็น id ของวิวไหน