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