Kotlin Java interop and Kotlin Migration

Transcript

1. KOTLIN'E GEÇIŞ VE JAVA
   ILE BIRLIKTE KULLANIMI
   

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

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

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

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

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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
   

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7. JAVA KODUNU KOTLINE ÇEVIRME
   

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8. GETTER SETTER
   

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9. 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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10. GETTER SETTER KOTLIN
    val kotlinValString = "Value"
    

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

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

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13. NULL SAFETY
    

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

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

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

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17. 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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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;
    }
    

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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;
    }
    

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

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

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

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

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

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25. STATIC VS COMPANION
    OBJECT
    

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

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27. JAVA STATIC
    String myString = JavaToKotlin.javaStaticString;
    

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

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

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

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

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

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

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

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

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36. PACKAGE LEVEL
    MEMBERS
    

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

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

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

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

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

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42. HIGHER ORDER
    FUNCTIONS
    

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

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

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

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

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

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

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

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

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

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52. EXTENSIONS
    

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53. 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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54. 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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55. EXTENSION FUNCTIONS
    val thridLetter = "foo".getThridLetter()
    

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

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57. TEŞEKKÜRLER
    HTTPS://MOCKK.IO/
    

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