はてなブックマークAndroidアプリでのKotlin導入

Transcript

1. ͸ͯͳϒοΫϚʔΫ AndroidΞϓϦͰͷ Kotlinಋೖ id:takuji31 @Kan Java party 2017 

2. ஫ҙࣄ߲ • AndroidΞϓϦ։ൃͷલఏ஌ࣝͱͳΔΑ͏ͳ ෦෼ͷղઆ͸͠·ͤΜ • ͜ͷεϥΠυʹॻ͔Ε͍ͯΔKotlinͷίʔυ΍ ࢓༷͸όʔδϣϯ1.1.2࣌఺ͷ΋ͷͰ͢ 

3. ࣗݾ঺հ • ੢ྛ ୓ࢤ (ʹ͠͹΍͠ ͨ͘͡) • (hatena|twitter|github) takuji31 •

   גࣜձࣾ͸ͯͳ ΞϓϦέʔγϣϯΤϯδχΞ • ͸ͯͳϒοΫϚʔΫΞϓϦνʔϜॴଐ 

4. ࣗݾ঺հ • Android։ൃ 2010೥2݄ʙ • Kotlin 2014೥12݄ʙ • iOS΍Webͷ։ൃ΋ᅂΉ 

5. ׆ಈ • Koreference • KotlinͰSharedPreferencesͷϞσϧΛ࡞Δ ϥΠϒϥϦʔ • Kansai.kt ӡӦ 

6. ϓϥΠϕʔτ • Χϝϥপॅਓ • ϚΠϘ΢ϥʔ (AVG175) • ࠷ۙ͏͗͞Λࣂ͍࢝Ί·ͨ͠ • ΞΠίϯ͸͏ͪͷࢠͰ͢

   

7. ͱ͜ΖͰ 

8. Έͳ͞ΜAndroidΞϓϦ ։ൃͯ͠·͔͢ʁ 

9. Kotlinॻ͍ͯ·͔͢ʁ 

10. ࠓ೔͸AndroidΞϓϦ։ൃʹ Ͳ͏΍ͬͯKotlinΛಋೖͯ͠ ͍͔͘Λ࿩͠·͢ 

11. AGENDA • Kotlinʹ͍ͭͯ • ͸ͯͳϒοΫϚʔΫʹ͍ͭͯ • ͸ͯͳϒοΫϚʔΫΞϓϦνʔϜͷߏ੒ • Kotlinಋೖ·ͰͷಓͷΓ •

    Kotlinͷಋೖͱͦͷޙ • KotlinԽͰى͖Δ໰୊ • KotlinͷݴޠػೳΛ׆༻͢Δ 

12. Kotlin ʹ͍ͭͯ 

13. JetBrainsࣾ (IntelliJ IDEAͷ։ൃݩ) ͕ ։ൃ͢Δݴޠ 

14. Kotlinͷಛ௃ • Swift like ͳه๏ • Null safety • ܕਪ࿦

    • ϓϩύςΟʔ • ϥϜμࣜ 

15. Kotlinͷಛ௃ • ֦ுؔ਺ / ֦ுϓϩύςΟʔ • data class / sealed

    class • delegation • Coroutine (ex. async/await) 

16. ଟ਺ͷϞμϯͳػೳΛ උ͍͑ͯΔ 

17. Google I/O 2017Ͱ Android ΞϓϦͷެࣜ։ൃݴޠʹ 

18. ͸ͯͳϒοΫϚʔΫ ʹ͍ͭͯ 

19. גࣜձࣾ͸ͯͳ͕ӡӦ͢Δ ιʔγϟϧϒοΫϚʔΫ αʔϏε 

20. Web Android iOS ϒϥ΢βʔ֦ு 

21. Web͸ScalaͰͷϦχϡʔΞ ϧ͕ਐߦத 

22. AndroidΞϓϦ͸ઌ೔ Ϧϊϕʔγϣϯ (େن໛ϦϑΝΫλϦϯά) ͕׬ྃ㊗ 

23. http://developer.hatenastaff.com/entry/ 2017/05/26/192200 

24. ͸ͯͳϒοΫϚʔΫ ΞϓϦνʔϜ ʹ͍ͭͯ 

25. ϝϯόʔߏ੒ • σΟϨΫλʔ • ϓϥϯφʔ • σβΠφʔ • Android /

    iOSΞϓϦ྆ํͷσβΠϯ୲౰ 

26. ϝϯόʔߏ੒ • ΤϯδχΞ3໊ • Swiftίϛολʔ • όϦόϦͷAndroidΞϓϦΤϯδχΞ(iOSษڧத) • takuji31 •

    AndroidΞϓϦͷϝΠϯ୲౰͸takuji31 

27. ΤϯδχΞ͸શ෦΍Δ 

28. શ෦ • AndroidΞϓϦ • iOSΞϓϦ • API • اը΍ΞΠσΟΞग़͠ɺνʔϜӡӦʹ΋खΛग़ ͢

    

29. ࣾ಺Ͱ࠷΋ΞΫςΟϒͳϞό ΠϧΞϓϦ։ൃνʔϜ 

30. Kotlin ಋೖ·ͰͷಓͷΓ 

31. ͸ͯͳͰͷ৽ٕज़ (ݴޠ΍ϛυϧ΢ΣΞ) ಋೖ 

32. ಋೖ·Ͱ • ΤϯδχΞ͕ىҊ • ٕज़ձͰಋೖͷੋඇ͕ٞ࿦͞ΕΔ • CTO͕ঝೝ 

33. Kotlinͷ৔߹ • I/O Keynote͕ऴΘͬͨ௚ޙͷேɺKotlinಋೖ ىҊ (5/18) • ٕज़ձ • ঝೝ

    (5/19) • ͜͜·Ͱ͓Αͦ1೔൒ 

34. Kotlin+͸ͯϒͷ৔߹ • (ि໌͚ͯ) 22೔͸νʔϜͷD͕ෆࡏͩͬͨͷ Ͱ1ճٳΈ • 23೔ேʹDͱձ࿩ͯ͠ಋೖܾఆ • ଈ೔ಋೖ 

35. Kotlin ಋೖͱͦͷޙ 

36. ͍Α͍ΑKotlinಋೖ 

37. खॱ • طଘͷΞϓϦέʔγϣϯΛͲ͏KotlinԽ͍ͯ͠ ͔͘ߟ͑Δ • ಋೖ • KotlinԽ 

38. طଘͷΞϓϦέʔγϣϯΛͲ ͏KotlinԽ͍͔ͯ͘͠ 

39. Ξϓϩʔν • શ෦Ұؾʹม׵͢Δ • ৽نίʔυ͚ͩKotlinͰॻ͘ • ৽نίʔυΛKotlinͰॻ͖ͭͭɺؔ࿈͢Δ෦෼ Λม׵͢Δ 

40. શ෦Ұؾʹஔ͖׵͑Δ 

41. શ෦Ұؾʹஔ͖׵͑Δ • ·ͱΊͯKotlinϓϥάΠϯͷࣗಈม׵Λߦ͏ • ৽نίʔυ͸΋ͪΖΜKotlin 

42. ϝϦοτ • શ෦ஔ͖׵ΘͬͯεοΩϦ͢Δ • Javaͱͷ૬ޓӡ༻Λߟ͑Δඞཁ͕ͳ͘ͳΔ • ؾ͍͍࣋ͪ 

43. σϝϦοτ • diff͕ഁ໓͢Δ • Ұؾʹม׵ࣗಈม׵ͷखͷಧ͔ͳ͍ͱ͜Ζ ΛखಈͰमਖ਼޻਺∞ • ஔ͖׵Θͬͨͷ͸จ๏͚ͩͰɺKotlinΒ͍͠ॻ ͖ํ͸Կ΋Ͱ͖͍ͯͳ͍ 

44. ࿘ອͰ͢Ͷ 

45. ৽نίʔυ͚ͩKotlinͰॻ͘ 

46. ৽نίʔυ͚ͩKotlinͰॻ͘ • ৽͍͠ϑΝΠϧ͚ͩKotlinʹ͢Δ • طଘͷJavaίʔυ͸ϊʔλον • طଘ෦෼ͷमਖ਼͸ͦͷ··JavaͰॻ͘ 

47. ϝϦοτ • ม׵ʹΑΔdiff͕ͳ͍ • KotlinͷֶशϖʔεΛίϯτϩʔϧ͠΍͍͢ • ͱΓ͋͑ͣ෼͔Βͳ͔ͬͨΒJavaͰॻ͍ͨΒ ͍͍ͱ͍͏͜ͱʹͰ͖Δ • ม׵޻਺θϩ

    

48. σϝϦοτ • ಋೖײബ͍ • Javaͱͷ૬ޓӡ༻Λҙࣝͨ͠ίʔυΛॻ͔ͳ͚Ε͹ͳΒͳ͍ • JavaͱKotlinͰ಄ͷίϯςΩετεΠον͕ൃੜ͢ΔͷͰ͋·Γੜ ࢈ੑ͸ग़ͳ͍ʢݸਓͷײ૝Ͱ͢ʣ • ݁ہJava͹͔ͬΓॻ͔ΕͨΓ͢Δ͔΋͠Εͳ͍

    • Ϟμϯͳػೳ͕࢖͍ͮΒ͔ͬͨΓ͢Δʢ֦ுؔ਺ͱ͔ʣ • ؾ࣋ͪΑ͘ͳ͍ 

49. ҆શࡦͬͯ ײ͡Ͱ͢Ͷ 

50. ৽نίʔυΛKotlinͰॻ͖ͭ ͭɺؔ࿈͢Δ෦෼Λม׵͢Δ 

51. ৽نKotlinʴม׵ • ৽نίʔυ͸KotlinͰॻ͘ • ͦͷίʔυΛݺͼग़͢ઌ΍ɺͦ͜Ͱ࢖͏ίʔ υΛKotlinʹม׵͢Δ • طଘͷΫϥεʹϝιουΛ௥Ճ͢ΔΑ͏ͳ࣌ ʹ΋Kotlinʹม׵͢Δ 

52. ϝϦοτ • ൺֱతߴ͍ಋೖײ • ͻͨ͢ΒKotlinΛॻ͚Δ • Javaͱͷ૬ޓӡ༻Λ΄ͱΜͲҙࣝ͠ͳͯ͘Α ͘ͳΔ • ؾ͍͍࣋ͪ

    

53. σϝϦοτ • diff͸·͊·͍͊͢͜͝ͱʹͳΔ • ͋ͳͨͱKotlinࠓֶ͙͢शɺͱ͍͏ײ͡ʹͳΔ • ม׵ίετ͸͋Δ • Ͳ͜·Ͱม׵͢Δ͔ͷઢҾ͖͕೉͍͠ 

54. όϥϯε͕ ྑͦ͞͏Ͱ͢Ͷ 

55. Ξϓϩʔν • શ෦Ұؾʹม׵͢Δ • ৽نίʔυ͚ͩKotlinͰॻ͘ • ৽نίʔυΛKotlinͰॻ͖ͭͭɺؔ࿈͢Δ෦෼ ΛKotlinʹม׵ ࠾༻ 

56. ಋೖ 

57. Gradleͷઃఆ Λ௥Ճ 

58. Tools Kotlin Configure Kotlin in Project 

59. ͋ͱ͸ Android Studioʹ೚ͤͯ ͓͚͹ऴΘΔ 

60. aptΛkaptʹ ஔ͖׵͑Δ 

61. 

62. Kotlin޲͚ͷ ϥΠϒϥϦʔಋೖ 

63. ϥΠϒϥϦʔΛಋೖ͢Δ͔ • KotlinͷݴޠػೳΛ࠷େݶ׆༻͢ΔͨΊʹ͸ඞ ཁ • KotlinΦϯϦʔͷϥΠϒϥϦʔ͸ΞΫςΟϒͳ ΋ͷ͕গͳ͍ͷͰ͸ʁ • KotlinͷݴޠόʔδϣϯͷมߋʹϥΠϒϥϦʔ ͕͍͍͚ͭͯΔ͔ʁ

    

64. ಋೖͷࢦ਑ • طଘϥΠϒϥϦʔͷ֦ு͸ੵۃతʹಋೖͯ͠ ͍͘ • KotlinΦϯϦʔͷϥΠϒϥϦʔ͸৻ॏʹબͿ 

65. KotlinԽʹ౰ͨͬͯಋೖͨ͠ϥΠϒ ϥϦʔୈ1஄ • RxKotlin • RxJavaͷKotlin֦ு • ศརͳ֦ுؔ਺܈ 

66. KotlinԽʹ౰ͨͬͯಋೖͨ͠ϥΠϒ ϥϦʔୈ1஄ • PaperParcel • Java੡ͷParcelableࣗಈੜ੒ϥΠϒϥϦʔ • ͜Ε·Ͱ͸IDEͷࣗಈੜ੒ͰͳΜͱ͔͍ͯͨ͠ • ͔͔ͤͬͩ͘Βboilerplate

    codeݮΒ͍ͨ͠ͷͰಋೖ • Kotlinͷdata classαϙʔτ • ଞͷParcelableܥϥΠϒϥϦʔΑΓKotlinͱͷ૬ੑ͕Α͔ͬͨ 

67. KotlinԽʹ౰ͨͬͯಋೖͨ͠ϥΠϒ ϥϦʔୈ1஄ • Koreference • ੿࡞ • SharedPreferencesΛ͍͍ײ͡ʹModelͬΆ͘ѻ͏ϥΠϒϥϦʔ • ϓϩύςΟʔΛఆٛ͢Δ͚ͩͰSharedPreferencesͷ஋Λૢ࡞Ͱ͖Δ

    • RxJava2ʹΑΔมߋ஋؂ࢹαϙʔτ • ͱʹ͔͘खͰSharedPreferencesͷॲཧॻ͖ͨ͘ͳ͍ͷͰಋೖ • υοάϑʔσΟϯά΋݉Ͷͯ 

68. ϥΠηϯεදه 

69. Kotlin͸Apache2ϥΠηϯ ε 

70. ඪ४ϥΠϒϥϦʔ͕ґଘͰ ೖΔͷͰϥΠηϯε΋දه ͠·͠ΐ͏ 

71. 

72. 

73. KotlinԽ 

74. ·ͣ͸ࢼͯ͠Έͨ 

75. ৽͍͠ActivityΛKotlinͰ 

76. ৽͍͠ActivityΛKotlinͰ • ৽نϑΝΠϧϝχϡʔͷKotlin ActivityΛબ୒ • Ұ୴ଞͷΫϥε͸ม׵ͤͣʹActivity͚ͩ KotlinͰॻ͘ • Pull Request

    -> merge 

77. طଘͷRepositoryʹ ϝιουΛ௥Ճ͢Δ 

78. طଘͷRepositoryʹϝιουΛ ௥Ճ͢Δ • ΫϥεϑΝΠϧΛCode Convert Java file to Kotlin fileͰKotlinʹ

    ม׵ • KotlinΒ͘͠ॻ͚Δͱ͜Ζ͸ॻ͖׵͑Δ • ֦ுؔ਺ • ϓϩύςΟʔ • ϥϜμࣜ • Repository͔Βฦ͢model͸Kotlinͷdata class 

79. طଘͷRepositoryʹϝιουΛ ௥Ճ͢Δ • ϩδοΫͷ࣮૷ • Pull Request merge 

80. Kotlin ಋೖͰى͖Δ໰୊ 

81. diffഁ໓໰୊ 

82. ΫϥεAΛJava Kotlin ͢Δ = A.java Λফͯ͠ A.ktΛ௥Ճ 

83. 2ഒͷdiff 

84. ίʔυͷमਖ਼ΛೖΕͨΒɺ ߋʹͦͷத͔ΒมߋΛݟ͚ͭ ͳ͚Ε͹ͳΒͳ͍ɻ 

85. 

86. ม׵͚ͩઌʹ΍͓ͬͯ͘ (Pull RequestΛ෼͚Δ) 

87. gitྺ࢙ফ໓໰୊ 

88. ม׵͢Δ͜ͱͰผϑΝΠϧʹ ͳΔͷͰɺgitͷཤྺ͕௥͑ͳ ͘ͳΔ 

89. ࣗಈม׵͕gitͰrenameѻ͍ ʹͳΕ͹ϥοΩʔ͕ͩɺͦ͏ ͍͏ϑΝΠϧ͸ن໛͕খ͍͞ ͷͰࠔΒͳ͍͜ͱ͕ଟ͍ 

90. ࠷ѱͷղܾํ๏ 

91. .ktʹϦωʔϜͯ͠ίϛοτ .javaʹ໭ͯ͠ม׵ͯ͠ ίϛοτ 

92. ͜ͷํ๏Ͱ git log --follow Ͱ௥͑ΔΑ͏ʹͳΔ 

93. (࢖ͬͯͳ͍) 

94. ϨϏϡʔίετ ߴ͗͢໰୊ 

95. ίʔυϨϏϡϫʔ͕Kotlinʹ ׳Εͯͳ͗ͯ͢͞ϨϏϡʔਫ਼ ౓͕Լ͕ͬͨΓɺεϐʔυ͕ མͪΔ 

96. ׳Εͷ໰୊ 

97. ϒοΫϚʔΫΞϓϦνʔϜ Ͱ͸ϖΞͰίʔυϨϏϡʔ 

98. ձ࿩Ͱٙ໰Λղܾ 

99. 

100. Kotlinॻ͚ͳ͍໰୊ 

101. ͍͖ͳΓ৽͍͠ݴޠॻ͚ͳ͍ (౰ͨΓલ) 

102. ॻ͚Δਓ͕νʔϜʹ1,2ਓ͔͠ ͍ͳ͍…ʁ 

103. ಛʹJavaҎ֎ॻ͍ͨ͜ͱ͕ ͳ͍ɺͱ͍͏ਓ 

104. ≒ Ϟμϯͳݴޠͷॻ͖ํ͕෼ ͔Βͳ͍ 

105. ॻ͚Δਓͱ ϖΞϓϩɺϖΞϨϏϡʔ ͠·͠ΐ͏ 

106. ϒοΫϚʔΫΞϓϦνʔϜ͸ ͳΜͱͳ͘ॻ͚Δਓ͕ ἧ͍ͬͯͨ☺ 

107. ୭΋ॻ͚Δਓ͕͍ͳ͍ͳΒ ·ͣಋೖલʹֶशͯ͘͠Εʂ 

108. kotlinlang.org/docs/ reference/ 

109. try.kotlinlang.org 

110. Kotlin ͷݴޠػೳΛ ׆༻͢Δ 

111. Property 

112. Πϯελϯεͷঢ়ଶΛ ද͢࢓૊Έ 

113. getter (+setter) (+ backing field) 

114. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
 

115. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
  ಡΈऔΓઐ༻

116. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
  ಡΈऔΓઐ༻ ಡΈॻ͖Մ

117. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
  ಡΈऔΓઐ༻ ಡΈॻ͖Մ ܕ

118. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
  ಡΈऔΓઐ༻ ಡΈॻ͖Մ ܕ ॳظ஋

119. Property class User(id: Long, name: String) {
 val id: Long


     var name: String
 var registered: Boolean = false
 
 init {
 this.id = id
 this.name = name
 }
 
 }
  ಡΈऔΓઐ༻ ಡΈॻ͖Մ ܕ ॳظ஋ JOJUϒϩοΫͰ
     ॳظԽ

120. ͜͏ஔ͖׵͑ΒΕ·͢ class User(val id: Long, var name: String) {
 var

     registered: Boolean = false
 }
 

121. ͜͏ஔ͖׵͑ΒΕ·͢ class User(val id: Long, var name: String) {
 var

     registered: Boolean = false
 }
  ίϯετϥΫλʔ಺Ͱ
     ϓϩύςΟʔఆٛ͢Δͱɺࣗಈతʹ୅ೖ͞ΕΔ

122. registered΋஋Λड͚औΕΔΑ͏ʹ class User(
 val id: Long,
 var name: String,
 var

     registered: Boolean = false
 )
 

123. registered΋஋Λड͚औΕΔΑ͏ʹ class User(
 val id: Long,
 var name: String,
 var

     registered: Boolean = false
 )
  SFHJTUFSFEΛ౉͞ͳ͔ͬͨΒGBMTF͕୅ೖ͞ΕΔ

124. data class 

125. ԿΒ͔ͷσʔλʔΛอ࣋͢Δ ͨΊͷΫϥε 

126. Model΍DTOΛ࡞ΔͨΊͷ ศརػೳຬࡌ 

127. ex.) طଘͷmodelΛKotlinʹ ม׵͍ͨ͠ 

128. ม׵͸Convert Java file to Kotlin fileͰ 

129. ୯७ͳม׵͚ͩͰΑ͍ͷ͔ʁ 

130. ୯७ͳม׵͚ͩͰΑ͍ͷ͔ʁ • Immutableʹ͍ͨ͠ • equals/hashCode/toStringͷ࣮૷ 

131. Immutableʹ 

132. શͯͷϓϩύςΟʔΛvalͰ ఆٛ + constructorͰ୅ೖ 

133. એݴ class User(
 val id: Long,
 val name: String,
 val

     registered: Boolean
 ) 

134. ࢖͏ fun main(args: Array<String>) {
 val unregisteredUser = User( id

     = 114514L, name = "takuji31", registered = false )
 val user = register(unregisteredUser)
 print(user)
 }
 
 fun register(user: User): User {
 // do something
 return User(user.id, user.name, true)
 } 

135. ίϐʔΛ΋ͬͱ͍͍ײ͡ʹ͠ ͍ͨ 

136. data classΛ࢖͏ 

137. એݴ data class User(
 val id: Long,
 val name: String,


     val registered: Boolean = false
 ) 

138. એݴ data class User(
 val id: Long,
 val name: String,


     val registered: Boolean = false
 )  ಄ʹEBUB Λ͚ͭΔ

139. એݴ data class User(
 val id: Long,
 val name: String,


     val registered: Boolean = false
 )  ಄ʹEBUB Λ͚ͭΔ શͯͷϓϩύςΟʔΛ
     DPOTUSVDUPSͰఆٛ

140. ࢖͏ fun register(user: User): User {
 // do something
 return

     user.copy(registered = true)
 } 

141. ࢖͏ fun register(user: User): User {
 // do something
 return

     user.copy(registered = true)
 }  DPQZϝιουͷҾ਺ʹ
     มߋ͍ͨ͠஋͚ͩΛ౉͢ͱ
     ίϐʔ͞ΕΔ

142. equals/hashCode/toString ͷ࣮૷ 

143. data classΛ࢖͏ͱࣗಈੜ੒ ͞ΕΔ 

144. ͸ͯͳϒοΫϚʔΫAndroid ΞϓϦͰ͸ modelΛdata class΁ ੵۃతʹஔ͖׵͍͑ͯ·͢ 

145. Extension 

146. ֦ுؔ਺/֦ுϓϩύςΟʔ 

147. طଘͷΫϥεʹ ؔ਺΍ϓϩύςΟʔΛੜ΍͢ (Α͏ʹݟͤΔ)࢓૊Έ 

148. ϑϨʔϜϫʔΫ΍ϥΠϒϥϦʔ ͷΫϥεΛ֦ு͍ͯ͘͠ͱΑ ͍ 

149. FragmentΛ֦ுϓϩύςΟʔͰ ֦ு͢Δ val Fragment.baseActivity: BaseActivity?
 get() = activity as BaseActivity?


     val Fragment.actionBar: ActionBar?
 get() = baseActivity?.supportActionBar 

150. FragmentΛ֦ுϓϩύςΟʔͰ ֦ு͢Δ val Fragment.baseActivity: BaseActivity?
 get() = activity as BaseActivity?


     val Fragment.actionBar: ActionBar?
 get() = baseActivity?.supportActionBar  ֦ு͍ͨ͠ܕ
     Λॻ͘

151. FragmentΛ֦ுϓϩύςΟʔͰ ֦ு͢Δ val Fragment.baseActivity: BaseActivity?
 get() = activity as BaseActivity?


     val Fragment.actionBar: ActionBar?
 get() = baseActivity?.supportActionBar  ֦ு͍ͨ͠ܕ
     Λॻ͘ ͦͷଞ͸௨ৗͷ
     ϓϩύςΟʔͱಉ͡

152. RealmͷProviderΛ֦ுؔ਺Ͱ ֦ு͢Δ fun Provider<Realm>.getAutoCloseObservable(): Observable<Realm> {
 val realm = get()


     realm.use {
 return Observable.create { emitter ->
 val instance = get()
 emitter.setCancellable {
 instance.close()
 }
 emitter.onNext(instance)
 }
 }
 } 

153. RealmͷProviderΛ֦ுؔ਺Ͱ ֦ு͢Δ fun Provider<Realm>.getAutoCloseObservable(): Observable<Realm> {
 val realm = get()


     realm.use {
 return Observable.create { emitter ->
 val instance = get()
 emitter.setCancellable {
 instance.close()
 }
 emitter.onNext(instance)
 }
 }
 }  ֦ு͍ͨ͠ܕ
     Λॻ͘

154. RealmͷProviderΛ֦ுؔ਺Ͱ ֦ு͢Δ fun Provider<Realm>.getAutoCloseObservable(): Observable<Realm> {
 val realm = get()


     realm.use {
 return Observable.create { emitter ->
 val instance = get()
 emitter.setCancellable {
 instance.close()
 }
 emitter.onNext(instance)
 }
 }
 }  ֦ு͍ͨ͠ܕ
     Λॻ͘ (FOFSJDTͷ
     ܕύϥϝʔλʔ΋ࢦఆՄ
 ϓϩύςΟʔ΋ಉ༷

155. RealmͷProviderΛ֦ுؔ਺Ͱ ֦ு͢Δ fun Provider<Realm>.getAutoCloseObservable(): Observable<Realm> {
 val realm = get()


     realm.use {
 return Observable.create { emitter ->
 val instance = get()
 emitter.setCancellable {
 instance.close()
 }
 emitter.onNext(instance)
 }
 }
 }  ֦ு͍ͨ͠ܕ
     Λॻ͘ ͦͷଞ͸௨ৗͷ
     ؔ਺ͱಉ͡ (FOFSJDTͷ
     ܕύϥϝʔλʔ΋ࢦఆՄ
 ϓϩύςΟʔ΋ಉ༷

156. ஫ҙ఺ 

157. ࣮ࡍʹ֦ு͞ΕΔ ͷͰ͸ͳ͘ɺ ࣮ମ͸staticͳ ϝιουݺͼग़͠ 

158. = ֦ுϓϩύςΟʔ͸ϑΟʔ ϧυΛ࣋ͯͳ͍ 

159. ఘΊͯଞͷΞϓϩʔνΛ ߟ͑·͠ΐ͏ 

160. ֦ு͗͢͠Δͱ Θ͚͕Θ͔Βͳ͘ͳΔ 

161. ΍Γա͗஫ҙ 

162. Delegated property 

163. ҕৡϓϩύςΟʔ 

164. ॲཧΛҕৡ͢Δ ϓϩύςΟʔΛ ࡞Δ͜ͱ͕Ͱ͖Δ 

165. σϑΥϧτͷ Delegated property(Ұ෦) • Delegates.notNull • not-null͕ͩॳظԽ࣌ʹॳظԽͰ͖ͳ͍ϓϩύςΟʔ • nullͷ··ΞΫηεͨ͠Βྫ֎ •

     lazy • ஗ԆॳظԽ • ࠷ॳͷΞΫηε࣌ʹҾ਺Ͱ౉ͨ͠ϒϩοΫͷ໭Γ஋Λฦͯ͠ Ωϟογϡ͢Δ 

166. ଟ෼͕࣌ؒ଍Γͳ͍ͷͰ 

167. see. github.com/takuji31/ Koreference 

168. Enjoy Kotlin Life