Kotlin Java interop and Kotlin Migration

Transcript

1. KOTLIN'E GEÇIŞ VE JAVA ILE BIRLIKTE KULLANIMI

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

3. KOTLIN ➤ 2011 Yılında Jetbrains tarafından duyuruldu ➤ 2017’de Google

   Android Resmi dil olarak duyuruldu

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

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

6. 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

7. JAVA KODUNU KOTLINE ÇEVIRME

8. GETTER SETTER

9. GETTER SETTER JAVA private String javaString = "non final string";

   public String getJavaString() { return javaString; } public void setJavaString(String javaString) { this.javaString = javaString; }

10. GETTER SETTER KOTLIN val kotlinValString = "Value"

11. GETTER SETTER KOTLIN TO JAVA val string = javaToKotlin.javaString javaToKotlin.javaString

    = "New variable"

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

    var");

13. NULL SAFETY

14. KOTLIN NULL SAFETY var nullableString: String? = null var notNullableString:

    String = "foo"

15. JAVA NULL SAFETY private String nullableString = null; public String

    getNullableString() { return nullableString; } public void setNullableString(String nullableString) { this.nullableString = nullableString; }

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

    val notNullableLength: Int = javaToKotlin.notNullableString.length

17. JAVA TO KOTLIN NULL SAFETY private String nullableString = null;

    public String getNullableString() { return nullableString; } public void setNullableString(String nullableString) { this.nullableString = nullableString; }

18. 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; }

19. 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; }

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

    val notNullableLength: Int = javaToKotlin.notNullableString.length

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

    Int = javaToKotlin.notNullableString.length

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

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

    0

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

25. STATIC VS COMPANION OBJECT

26. JAVA STATIC public static String javaStaticString = "myJavaStaticString";

27. JAVA STATIC String myString = JavaToKotlin.javaStaticString;

28. KOTLIN TO JAVA STATIC val myJavaStaticString = JavaToKotlin.javaStaticString

29. KOTLIN TO JAVA STATIC class KotlinToJava { companion object {

    val companionString = "companion string" fun companionFunction(): String { return "companion function" } } }

30. KOTLIN TO JAVA STATIC val companionValString = KotlinToJava.companionString val companionFunString

    = KotlinToJava.companionFunction()

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

    KotlinToJava.Companion.companionFunction();

32. KOTLIN TO JAVA STATIC class KotlinToJava { companion object {

    val companionString = "companion string" fun companionFunction(): String { return "companion function" } } }

33. KOTLIN TO JAVA STATIC class KotlinToJava { companion object {

    @JvmStatic val companionString = "companion string" @JvmStatic fun companionFunction(): String { return "companion function" } } }

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

    KotlinToJava.Companion.companionFunction();

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

    KotlinToJava.companionFunction();

36. PACKAGE LEVEL MEMBERS

37. PACKAGE LEVEL MEMBERS const val packageLevelConstant = "kotlinToJava" fun packageLevelFunction():

    String { return "this is a package level function" }

38. PACKAGE LEVEL MEMBERS import com.oshamahue.kotlindemo.packageLevelConstant import com.oshamahue.kotlindemo.packageLevelFunction fun otherPackageLevelFunction() {

    var string = packageLevelFunction() string = packageLevelConstant }

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

    string = KotlinToJavaKt.packageLevelConstant;

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

    java.io.IOException . . . .

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

    string = KotlinToJavaUtil.packageLevelConstant;

42. HIGHER ORDER FUNCTIONS

43. HIGHER ORDER FUNCTIONS ➤ Bir fonksiyon döndüren ➤ Parametre olarak

    fonksiyon alabilen ➤ Temelde bir fonksiyona bir değişken olarak davranabilme

44. HIGHER ORDER FUNCTIONS fun functionPass(func: (String) -> Unit) { func("myString")

    //invoking a function }

45. HIGHER ORDER FUNCTIONS functionPass(this ::nullables)

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

47. HIGHER ORDER FUNCTIONS fun functionReturn(): () -> Unit { val

    func = { println("my function") } //function creation return func }

48. JAVA TO KOTLIN HIGHER ORDER FUNCTIONS fun functionPass(func: (String) ->

    Unit) { func("myString") //invoking a function }

49. JAVA TO KOTLIN HIGHER ORDER FUNCTIONS kotlinToJava.functionPass(new Function1<String,Unit>() { @Override

    public Unit invoke(String string) { return null; } });

50. JAVA TO KOTLIN HIGHER ORDER FUNCTIONS fun functionReturn(): () ->

    Unit { val func = { println("my function") } //function creation return func }

51. JAVA TO KOTLIN HIGHER ORDER FUNCTIONS Function0<Unit> func = kotlinToJava.functionReturn();

    func.invoke();

52. EXTENSIONS

53. EXTENSIONS ➤ Hali hazırda bulunan Class’lara kalıtım(inheritance) olmadan yeni fonksiyon

    ya da değişken eklemeyi sağlar ➤ Herhangi bir class olabilir ➤ Static olarak derlenir

54. EXTENSION FUNCTIONS fun String.getThridLetter(): Char { if (this.length > 2)

    { return this.toCharArray()[2] } else throw RuntimeException("Length should be at least 3 ") }

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

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

57. TEŞEKKÜRLER HTTPS://MOCKK.IO/