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/