Kotlin Java interop and Kotlin Migration

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KOTLIN'E GEÇIŞ VE JAVA ILE BIRLIKTE KULLANIMI

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BEN KIMIM ➤ Lead Android Dev @CizitzenMe ➤ https://haditok.com

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KOTLIN ➤ 2011 Yılında Jetbrains tarafından duyuruldu ➤ 2017’de Google Android Resmi dil olarak duyuruldu

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KOTLIN ➤ http://kotlinlang.org/docs/reference/ ➤ https://try.kotlinlang.org/ ➤ https://android.github.io/kotlin-guides/interop.html

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SOURCE CODE ➤ https://github.com/oshamahue/KotlinInteropCases

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KOTLIN KONFIGÜRASYONU ➤ Kotlin’i aktive etme ➤ Tools > Kotlin > Conﬁgure Kotlin in Project ➤ Gradle dependency annotationProcessor -> kapt ➤ Kotlin Interop Lint check ➤ Preferences> Editor> Inspections ➤ Android>Lint > Interoperability>Kotlin Interoperability

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JAVA KODUNU KOTLINE ÇEVIRME

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GETTER SETTER

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GETTER SETTER JAVA private String javaString = "non final string"; public String getJavaString() { return javaString; } public void setJavaString(String javaString) { this.javaString = javaString; }

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GETTER SETTER KOTLIN val kotlinValString = "Value"

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GETTER SETTER KOTLIN TO JAVA val string = javaToKotlin.javaString javaToKotlin.javaString = "New variable"

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GETTER SETTER JAVA TO KOTLIN String var = kotlinToJava.getKotlinVarString(); kotlinToJava.setKotlinVarString("New var");

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NULL SAFETY

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KOTLIN NULL SAFETY var nullableString: String? = null var notNullableString: String = "foo"

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JAVA NULL SAFETY private String nullableString = null; public String getNullableString() { return nullableString; } public void setNullableString(String nullableString) { this.nullableString = nullableString; }

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JAVA TO KOTLIN NULL SAFETY val nullableLength: Int = javaToKotlin.nullableString.length val notNullableLength: Int = javaToKotlin.notNullableString.length

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JAVA TO KOTLIN NULL SAFETY private String nullableString = null; public String getNullableString() { return nullableString; } public void setNullableString(String nullableString) { this.nullableString = nullableString; }

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JAVA TO KOTLIN NULL SAFETY @Nullable private String nullableString = null; @Nullable public String getNullableString() { return nullableString; } public void setNullableString(@Nullable String nullableString) { this.nullableString = nullableString; }

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JAVA TO KOTLIN NULL SAFETY @NotNull private String notNullableString = "bar"; @NotNull public String getNotNullableString() { return notNullableString; } public void setNotNullableString(@NotNull String notNullableString) { this.notNullableString = notNullableString; }

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JAVA TO KOTLIN NULL SAFETY val nullableLength: Int = javaToKotlin.nullableString.length val notNullableLength: Int = javaToKotlin.notNullableString.length

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KOTLIN NULLABLE TYPE val nullableLength: Int? = javaToKotlin.nullableString.length val notNullableLength: Int = javaToKotlin.notNullableString.length

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KOTLIN SAFE CALL OPERATOR val nullableLength: Int = javaToKotlin.nullableString ?.length

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KOTLIN ELVIS OPERATOR val nullableLength: Int = javaToKotlin.nullableString ?.length ?: 0

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KOTLIN !! OPERATOR val nullableLength: Int = javaToKotlin.nullableString ?.length !!

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STATIC VS COMPANION OBJECT

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JAVA STATIC public static String javaStaticString = "myJavaStaticString";

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JAVA STATIC String myString = JavaToKotlin.javaStaticString;

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KOTLIN TO JAVA STATIC val myJavaStaticString = JavaToKotlin.javaStaticString

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KOTLIN TO JAVA STATIC class KotlinToJava { companion object { val companionString = "companion string" fun companionFunction(): String { return "companion function" } } }

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KOTLIN TO JAVA STATIC val companionValString = KotlinToJava.companionString val companionFunString = KotlinToJava.companionFunction()

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JAVA TO KOTLIN COMPANION OBJECT companionValString = KotlinToJava.Companion.getCompanionString(); companionFunString = KotlinToJava.Companion.companionFunction();

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KOTLIN TO JAVA STATIC class KotlinToJava { companion object { val companionString = "companion string" fun companionFunction(): String { return "companion function" } } }

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KOTLIN TO JAVA STATIC class KotlinToJava { companion object { @JvmStatic val companionString = "companion string" @JvmStatic fun companionFunction(): String { return "companion function" } } }

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JAVA TO KOTLIN COMPANION OBJECT companionValString = KotlinToJava.Companion.getCompanionString(); companionFunString = KotlinToJava.Companion.companionFunction();

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JAVA TO KOTLIN COMPANION OBJECT companionValString = KotlinToJava.getCompanionString(); companionFunString = KotlinToJava.companionFunction();

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PACKAGE LEVEL MEMBERS

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PACKAGE LEVEL MEMBERS const val packageLevelConstant = "kotlinToJava" fun packageLevelFunction(): String { return "this is a package level function" }

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PACKAGE LEVEL MEMBERS import com.oshamahue.kotlindemo.packageLevelConstant import com.oshamahue.kotlindemo.packageLevelFunction fun otherPackageLevelFunction() { var string = packageLevelFunction() string = packageLevelConstant }

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JAVA TO KOTLIN PACKAGE LEVEL MEMBERS String string = KotlinToJavaKt.packageLevelFunction(); string = KotlinToJavaKt.packageLevelConstant;

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JAVA TO KOTLIN PACKAGE LEVEL MEMBERS @file:JvmName("KotlinToJavaUtil") package com.oshamahue.kotlindemo import java.io.IOException . . . .

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JAVA TO KOTLIN PACKAGE LEVEL MEMBERS String string = KotlinToJavaUtil.packageLevelFunction(); string = KotlinToJavaUtil.packageLevelConstant;

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HIGHER ORDER FUNCTIONS

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HIGHER ORDER FUNCTIONS ➤ Bir fonksiyon döndüren ➤ Parametre olarak fonksiyon alabilen ➤ Temelde bir fonksiyona bir değişken olarak davranabilme

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HIGHER ORDER FUNCTIONS fun functionPass(func: (String) -> Unit) { func("myString") //invoking a function }

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HIGHER ORDER FUNCTIONS functionPass(this ::nullables)

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HIGHER ORDER FUNCTIONS val func = { println("my function") }

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HIGHER ORDER FUNCTIONS fun functionReturn(): () -> Unit { val func = { println("my function") } //function creation return func }

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JAVA TO KOTLIN HIGHER ORDER FUNCTIONS fun functionPass(func: (String) -> Unit) { func("myString") //invoking a function }

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JAVA TO KOTLIN HIGHER ORDER FUNCTIONS kotlinToJava.functionPass(new Function1() { @Override public Unit invoke(String string) { return null; } });

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JAVA TO KOTLIN HIGHER ORDER FUNCTIONS fun functionReturn(): () -> Unit { val func = { println("my function") } //function creation return func }

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JAVA TO KOTLIN HIGHER ORDER FUNCTIONS Function0 func = kotlinToJava.functionReturn(); func.invoke();

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EXTENSIONS

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EXTENSIONS ➤ Hali hazırda bulunan Class’lara kalıtım(inheritance) olmadan yeni fonksiyon ya da değişken eklemeyi sağlar ➤ Herhangi bir class olabilir ➤ Static olarak derlenir

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EXTENSION FUNCTIONS fun String.getThridLetter(): Char { if (this.length > 2) { return this.toCharArray()[2] } else throw RuntimeException("Length should be at least 3 ") }

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EXTENSION FUNCTIONS val thridLetter = "foo".getThridLetter()

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JAVA TO KOTLIN EXTENSION FUNCTIONS char thirdLetter = KotlinToJavaUtil.getThridLetter("foo");

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