KotlinとモダンなライブラリーでAndroidアプリを作るっ

Transcript

1. KotlinͱϞμϯͳϥΠϒϥϦʔ ͰAndroidΞϓϦΛ࡞Δͬ ͨ͘͡ (@takuji31)
2. @takuji31 (Takuji Nishibayashi) Application Engineer at Hatena
3. Loves Kotlin
4. KotlinͰΞϓϦ։ൃத (ϓϥΠϕʔτͰ)
5. AGENDA • KotlinͰAndroidΞϓϦΛ࡞Δ • KotlinͰJavaͷϥΠϒϥϦʔΛ࢖͏ • KotlinͷϥΠϒϥϦʔΛ࢖͏
6. Kotlin 1.0.0 released
7. Kotlin 1.0.1-2 released
8. KotlinͰ AndroidΞϓ ϦΛ࡞Δ
9. Android Java = Java6 + α
10. + α
11. Diamond operator
12. Multi catch
13. try-with-resources (4.4~)
14. ͭΒ͍
15. Kotlin
16. Null-safe
17. Property
18. Delegate
19. Lambda expression
20. Extension
21. Smart cast
22. ߴ͍Javaͱͷ ૬ޓӡ༻ੑ
23. JetBrainsࣗମ͕ Androidαϙʔτʹྗ ΛೖΕ͍ͯΔ
24. ࠷ߴ
25. KotlinͰJava ͷϥΠϒϥϦʔ Λ࢖͏
26. Dagger2
27. ίϯύΠϧλΠϜʹ ґଘΛղܾ͢Δ DIίϯςφ
28. Component/Module
29. Module͕ ґଘΛఏڙ
30. Component͕ ґଘΛ஫ೖ
31. KotlinͰͷ࢖͍ํ
32. build.gradle dependencies { compile 'com.google.dagger:dagger:2.1'
 kapt "com.google.dagger:dagger-compiler:2.1"
 compile 'javax.annotation:javax.annotation-api:1.2'
 } kapt {
 generateStubs = true
 }

33. build.gradle dependencies { compile 'com.google.dagger:dagger:2.1'
 kapt "com.google.dagger:dagger-compiler:2.1"
 compile 'javax.annotation:javax.annotation-api:1.2'
 } kapt {
 generateStubs = true
 }
 LBQUͰ,PUMJOͷΫϥεʹ
    ରͯ͠"15Λ࣮ߦͰ͖ΔΑ͏ʹ͢Δ
34. build.gradle dependencies { compile 'com.google.dagger:dagger:2.1'
 kapt "com.google.dagger:dagger-compiler:2.1"
 compile 'javax.annotation:javax.annotation-api:1.2'
 } kapt {
 generateStubs = true
 }
 LBQUͰ,PUMJOͷΫϥεʹ
    ରͯ͠"15Λ࣮ߦͰ͖ΔΑ͏ʹ͢Δ ίϯύΠϧ࣌ʹ+BWBͰTUVCϑΝΠϧΛੜ੒
    ͢Δ͜ͱͰɺ"15Ͱੜ੒͞ΕͨΫϥεΛ
    ,PUMJOͰ΋ѻ͑ΔΑ͏ʹ͢Δ
35. Module @Module
 class AppModule(@get:Provides val context: Context) {
 @Provides fun notificationManager(context: Context) : NotificationManager = context.getSystemService( Context.NOTIFICATION_SERVICE) as NotificationManager
 }
36. Module @Module
 class AppModule(@get:Provides val context: Context) {
 @Provides fun notificationManager(context: Context) : NotificationManager = context.getSystemService( Context.NOTIFICATION_SERVICE) as NotificationManager
 } (FUUFSʹ1SPWJEFT
    BOOPUBUJPOΛ͚ͭΔ
37. Module @Module
 class AppModule(@get:Provides val context: Context) {
 @Provides fun notificationManager(context: Context) : NotificationManager = context.getSystemService( Context.NOTIFICATION_SERVICE) as NotificationManager
 } (FUUFSʹ1SPWJEFT
    BOOPUBUJPOΛ͚ͭΔ ґଘΛఏڙ͢Δϝιουʹ
    1SPWJEFT
    BOOPUBUJPOΛ͚ͭΔ
38. Component @Component(modules = arrayOf(AppModule::class))
 interface AppComponent {
 val context: Context
 val notificationManager: NotificationManager
 
 fun inject(mainActivity: MainActivity)
 }
39. Component @Component(modules = arrayOf(AppModule::class))
 interface AppComponent {
 val context: Context
 val notificationManager: NotificationManager
 
 fun inject(mainActivity: MainActivity)
 } ௚઀औಘ͢ΔͨΊʹϓϩύςΟʔ
    ϝιουͰ΋Α͍ ΛఆٛͰ͖Δ
40. Component @Component(modules = arrayOf(AppModule::class))
 interface AppComponent {
 val context: Context
 val notificationManager: NotificationManager
 
 fun inject(mainActivity: MainActivity)
 } ௚઀औಘ͢ΔͨΊʹϓϩύςΟʔ
    ϝιουͰ΋Α͍ ΛఆٛͰ͖Δ ஫ೖ͢ΔͨΊͷϝιουΛ
    ఆٛ͢Δ
41. Application class class App : Application() {
 val component : AppComponent by lazy {
 DaggerAppComponent .builder().appModule(AppModule(this)).build()
 }
 override fun onCreate() {
 super.onCreate()
 }
 }
42. Application class class App : Application() {
 val component : AppComponent by lazy {
 DaggerAppComponent .builder().appModule(AppModule(this)).build()
 }
 override fun onCreate() {
 super.onCreate()
 }
 } $PNQPOFOUΛอ࣋͢ΔͨΊͷ
    ϓϩύςΟʔΛ࡞Δ
43. Application class class App : Application() {
 val component : AppComponent by lazy {
 DaggerAppComponent .builder().appModule(AppModule(this)).build()
 }
 override fun onCreate() {
 super.onCreate()
 }
 } $PNQPOFOUΛอ࣋͢ΔͨΊͷ
    ϓϩύςΟʔΛ࡞Δ MB[ZΛ࢖͏͜ͱͰ
    ॳճΞΫηε࣌ʹॳظԽ
44. Application class class App : Application() {
 val component : AppComponent by lazy {
 DaggerAppComponent .builder().appModule(AppModule(this)).build()
 }
 override fun onCreate() {
 super.onCreate()
 }
 } $PNQPOFOUΛอ࣋͢ΔͨΊͷ
    ϓϩύςΟʔΛ࡞Δ MB[ZΛ࢖͏͜ͱͰ
    ॳճΞΫηε࣌ʹॳظԽ "15Ͱੜ੒͞ΕͨΫϥεΛ
    ࡞ͬͯฦ͢
45. Target class MainActivity : AppCompatActivity() {
 @Inject
 lateinit var context : Context
 
 @Inject
 lateinit var notificationManager : NotificationManager
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 app.component.inject(mainActivity = this)
 }
 }
46. Target class MainActivity : AppCompatActivity() {
 @Inject
 lateinit var context : Context
 
 @Inject
 lateinit var notificationManager : NotificationManager
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 app.component.inject(mainActivity = this)
 }
 } *OKFDU
    BOOPUBUJPOΛ͚ͭͨ
    QSPQFSUZ΍ϝιουʹґଘ஫ೖ͞ΕΔ
47. Target class MainActivity : AppCompatActivity() {
 @Inject
 lateinit var context : Context
 
 @Inject
 lateinit var notificationManager : NotificationManager
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 app.component.inject(mainActivity = this)
 }
 } *OKFDU
    BOOPUBUJPOΛ͚ͭͨ
    QSPQFSUZ΍ϝιουʹґଘ஫ೖ͞ΕΔ MBUFJOJU
    Λ͚ͭΔ͜ͱͰॳظԽ͕ෆཁʹͳΓɺ
    ͔ͭϑΟʔϧυʹ+BWB͔Β௚઀୅ೖͰ͖ΔΑ͏ʹ
48. Target class MainActivity : AppCompatActivity() {
 @Inject
 lateinit var context : Context
 
 @Inject
 lateinit var notificationManager : NotificationManager
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)
 app.component.inject(mainActivity = this)
 }
 } *OKFDU
    BOOPUBUJPOΛ͚ͭͨ
    QSPQFSUZ΍ϝιουʹґଘ஫ೖ͞ΕΔ MBUFJOJU
    Λ͚ͭΔ͜ͱͰॳظԽ͕ෆཁʹͳΓɺ
    ͔ͭϑΟʔϧυʹ+BWB͔Β௚઀୅ೖͰ͖ΔΑ͏ʹ $PNQPOFOUͷJOKFDUϝιουʹର৅ͷΠϯελϯε Λ౉͢ BQQ͸"QQΛऔಘ͢Δ֦ுϓϩύςΟʔ
49. Data Binding Library
50. Androidެࣜͷσʔ λʔόΠϯσΟϯά ϥΠϒϥϦʔ
51. Android Studio ʹΑΔαϙʔτ (ίʔυิ׬ɺγϯ λοΫεϋΠϥΠτ)
52. Ұํ޲/૒ํ޲ͷόΠ ϯσΟϯάαϙʔτ
53. KotlinͰ΋ ࢖͑Δ
54. build.gradle android {
 dataBinding {
 enabled = true
 }
 }
 
 dependencies {
 kapt 'com.android.databinding:compiler:2.1.0-alpha5'
 }
 kapt {
 generateStubs = true
 }
55. όΠϯυ͍ͨ͠ΫϥεΛ࡞Δ data class User(val name: String, val birthDay: String?)
56. ϨΠΞ΢τͷXMLͰ όΠϯσΟϯάΛఆٛ
57. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout>
58. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU
59. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛఆٛ
60. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛఆٛ ఆٛͨ͠ϓϩύςΟʔ΍ ͦͷϓϩύςΟʔΛόΠ ϯσΟϯά
61. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛఆٛ +BWBಉ༷ʹJNQPSUՄೳ ఆٛͨ͠ϓϩύςΟʔ΍ ͦͷϓϩύςΟʔΛόΠ ϯσΟϯά
62. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛఆٛ +BWBಉ༷ʹJNQPSUՄೳ ఆٛͨ͠ϓϩύςΟʔ΍ ͦͷϓϩύςΟʔΛόΠ ϯσΟϯά Ұ෦ͷԋࢉࢠ΋࢖͑Δ
63. ϨΠΞ΢τͷXML(Ұ෦ུ) <layout>
 <data>
 <variable name=“user" type="jp.takuji31.kotlindatabinding.User" />
 <variable name=“randomButtonClickListener” type="android.view.View.OnClickListener" />
 <import type="android.view.View" />
 </data>
 <RelativeLayout>
 <TextView android:text="Name : "/>
 <TextView android:text="@{user.name}" tools:text="namename" />
 <TextView android:text="Birthday : "
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}" />
 <TextView android:text=“@{user.birthDay}" tools:text="1970/01/01"
 android:visibility="@{user.birthDay != null ? View.VISIBLE : View.GONE}” />
 <Button android:onClick="@{randomButtonClickListener}"/>
 </RelativeLayout>
 </layout> ϧʔτཁૉ͸MBZPVU όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛఆٛ +BWBಉ༷ʹJNQPSUՄೳ ఆٛͨ͠ϓϩύςΟʔ΍ ͦͷϓϩύςΟʔΛόΠ ϯσΟϯά Ұ෦ͷԋࢉࢠ΋࢖͑Δ 0O$MJDL-JTUFOFS΋ઃఆՄ
64. ఆٛΛݩʹAPTͰ ΫϥεΛࣗಈੜ੒
65. όΠϯυ͢Δ class DataClassActivity : AppCompatActivity() {
 var users = listOf(
 User(name = "takuji31", birthDay = "1987/03/01"),
 User(name = "takuji32", birthDay = "1987/03/02"),
 User(name = "takuji33", birthDay = "1987/03/03"),
 User(name = "takuji24884", birthDay = null)
 )
 val binding: ActivityDataClassBinding by lazy {
 DataBindingUtil.setContentView<ActivityDataClassBinding>(this, R.layout.activity_data_class)
 }
 override fun onCreate(savedInstanceState: Bundle?) {
 binding.user = users.last()
 binding.randomButtonClickListener = View.OnClickListener {
 binding.user = users[0]
 users = users.drop(1) + binding.user
 }
 }
 }
66. όΠϯυ͢Δ class DataClassActivity : AppCompatActivity() {
 var users = listOf(
 User(name = "takuji31", birthDay = "1987/03/01"),
 User(name = "takuji32", birthDay = "1987/03/02"),
 User(name = "takuji33", birthDay = "1987/03/03"),
 User(name = "takuji24884", birthDay = null)
 )
 val binding: ActivityDataClassBinding by lazy {
 DataBindingUtil.setContentView<ActivityDataClassBinding>(this, R.layout.activity_data_class)
 }
 override fun onCreate(savedInstanceState: Bundle?) {
 binding.user = users.last()
 binding.randomButtonClickListener = View.OnClickListener {
 binding.user = users[0]
 users = users.drop(1) + binding.user
 }
 }
 } MB[Z
    ΍
    OPU/VMMͷEFMFHBUFΛ࢖ͬͯ
    όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛ༻ҙ͢ΔͱΑ͍
67. όΠϯυ͢Δ class DataClassActivity : AppCompatActivity() {
 var users = listOf(
 User(name = "takuji31", birthDay = "1987/03/01"),
 User(name = "takuji32", birthDay = "1987/03/02"),
 User(name = "takuji33", birthDay = "1987/03/03"),
 User(name = "takuji24884", birthDay = null)
 )
 val binding: ActivityDataClassBinding by lazy {
 DataBindingUtil.setContentView<ActivityDataClassBinding>(this, R.layout.activity_data_class)
 }
 override fun onCreate(savedInstanceState: Bundle?) {
 binding.user = users.last()
 binding.randomButtonClickListener = View.OnClickListener {
 binding.user = users[0]
 users = users.drop(1) + binding.user
 }
 }
 } MB[Z
    ΍
    OPU/VMMͷEFMFHBUFΛ࢖ͬͯ
    όΠϯσΟϯάΫϥεͷ
    ϓϩύςΟʔΛ༻ҙ͢ΔͱΑ͍ ࣗಈੜ੒͞ΕΔΫϥεʹ͸ఆ໊ٛͨ͠લͱಉ ͡ϓϩύςΟʔ ਖ਼֬ʹ͸TFUUFSHFUUFS ͕
    ੜ੒͞ΕΔͷͰɺηοτ͢Δͱ஋͕൓ө͞Ε Δ
70. (ViewClass)findById(R.id.vi ewId)͸΋͏ෆཁͰ͢
71. Define binding <layout>
 
 <android.support.v7.widget.RecyclerView
 android:id="@+id/recyclerView"
 android:layout_width="match_parent"
 android:layout_height="match_parent"/>
 </layout>
72. Define binding <layout>
 
 <android.support.v7.widget.RecyclerView
 android:id="@+id/recyclerView"
 android:layout_width="match_parent"
 android:layout_height="match_parent"/>
 </layout> JEΛTOBLF@DBTF͔ MPXFS$BNFM$BTFͰఆٛ
73. Field access class MainActivity : AppCompatActivity() {
 val binding : ActivityMainBinding by lazy {DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)} 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.recyclerView.layoutManager = LinearLayoutManager(this)
 }
 }
74. Field access class MainActivity : AppCompatActivity() {
 val binding : ActivityMainBinding by lazy {DataBindingUtil.setContentView<ActivityMainBinding>(this, R.layout.activity_main)} 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.recyclerView.layoutManager = LinearLayoutManager(this)
 }
 } MPXFS$BNFM$BTFͰϑΟʔϧ υ͕ੜ੒͞ΕΔ
75. Property observer
76. มߋ؂ࢹՄೳͳσʔλʔΫϥε class Counter : BaseObservable() {
 @get:Bindable
 var count : Int = 0
 set(value) {
 field = value
 notifyPropertyChanged(BR.count)
 }
 }

77. มߋ؂ࢹՄೳͳσʔλʔΫϥε class Counter : BaseObservable() {
 @get:Bindable
 var count : Int = 0
 set(value) {
 field = value
 notifyPropertyChanged(BR.count)
 }
 }
 มߋ؂ࢹΛ͍ͨ͠৔߹͸
    #BTF0CTFSWBCMFΛܧঝ
78. มߋ؂ࢹՄೳͳσʔλʔΫϥε class Counter : BaseObservable() {
 @get:Bindable
 var count : Int = 0
 set(value) {
 field = value
 notifyPropertyChanged(BR.count)
 }
 }
 มߋ؂ࢹΛ͍ͨ͠৔߹͸
    #BTF0CTFSWBCMFΛܧঝ ؂ࢹ͍ͨ͠ϓϩύςΟʔͷ
    HFUUFSʹ#JOEBCMF
    BOOPUBUJPOΛ͚ͭΔ
79. มߋ؂ࢹՄೳͳσʔλʔΫϥε class Counter : BaseObservable() {
 @get:Bindable
 var count : Int = 0
 set(value) {
 field = value
 notifyPropertyChanged(BR.count)
 }
 }
 มߋ؂ࢹΛ͍ͨ͠৔߹͸
    #BTF0CTFSWBCMFΛܧঝ ؂ࢹ͍ͨ͠ϓϩύςΟʔͷ
    HFUUFSʹ#JOEBCMF
    BOOPUBUJPOΛ͚ͭΔ ஋͕มߋ͞Εͨ͜ͱΛ௨஌
80. όΠϯσΟϯάΛఆٛ <layout>
 <data>
 <variable name=“counter" type=“…PropertyObserverActivity.Counter” />
 <variable name="buttonClickListener"
 type="android.view.View.OnClickListener" />
 </data>
 <LinearLayout>
 <TextView android:text="@{@string/count_format(counter.count)}"/>
 <Button android:onClick=“@{buttonClickListener}" />
 </LinearLayout>
 </layout>

81. Change value class PropertyObserverActivity : AppCompatActivity() {
 val binding : ActivityPropertyObserverBinding by lazy { DataBindingUtil.setContentView( this, R.layout.activity_property_observer ) } 
 override fun onCreate(savedInstanceState: Bundle?) {
 val counter = Counter()
 binding.counter = counter
 binding.buttonClickListener = View.OnClickListener {
 counter.count += 1 }
 }
 }
82. Change value class PropertyObserverActivity : AppCompatActivity() {
 val binding : ActivityPropertyObserverBinding by lazy { DataBindingUtil.setContentView( this, R.layout.activity_property_observer ) } 
 override fun onCreate(savedInstanceState: Bundle?) {
 val counter = Counter()
 binding.counter = counter
 binding.buttonClickListener = View.OnClickListener {
 counter.count += 1 }
 }
 } ஋Ληοτ͢Δ͚ͩͰ
    มߋ͕൓ө͞ΕΔ
85. Binding adapter
86. Viewͷଐੑʹ஋Λ ηοτ͢ΔॲཧΛఆٛ ͢Δ࢓૊Έ
87. BindingAdapterΛఆٛ object Adapters {
 @JvmStatic
 @BindingAdapter("android:text")
 fun convertZonedDateTimeToString (textView: TextView, zonedDateTime : ZonedDateTime) {
 val timeString = zonedDateTime.format( DateTimeFormatter.ofPattern("yyyy/MM/dd/ HH:mm:SS"))
 textView.text = timeString
 }
 }
88. BindingAdapterΛఆٛ object Adapters {
 @JvmStatic
 @BindingAdapter("android:text")
 fun convertZonedDateTimeToString (textView: TextView, zonedDateTime : ZonedDateTime) {
 val timeString = zonedDateTime.format( DateTimeFormatter.ofPattern("yyyy/MM/dd/ HH:mm:SS"))
 textView.text = timeString
 }
 } +WN4UBUJD
    BOOPUBUJPOΛ
    ͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ
89. BindingAdapterΛఆٛ object Adapters {
 @JvmStatic
 @BindingAdapter("android:text")
 fun convertZonedDateTimeToString (textView: TextView, zonedDateTime : ZonedDateTime) {
 val timeString = zonedDateTime.format( DateTimeFormatter.ofPattern("yyyy/MM/dd/ HH:mm:SS"))
 textView.text = timeString
 }
 } +WN4UBUJD
    BOOPUBUJPOΛ
    ͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ BOESPJEUFYUଐੑ΁஋Λ
    ηοτͰ͖Δ
90. BindingAdapterΛఆٛ object Adapters {
 @JvmStatic
 @BindingAdapter("android:text")
 fun convertZonedDateTimeToString (textView: TextView, zonedDateTime : ZonedDateTime) {
 val timeString = zonedDateTime.format( DateTimeFormatter.ofPattern("yyyy/MM/dd/ HH:mm:SS"))
 textView.text = timeString
 }
 } +WN4UBUJD
    BOOPUBUJPOΛ
    ͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ BOESPJEUFYUଐੑ΁஋Λ
    ηοτͰ͖Δ 5FYU7JFXͱ;POFE%BUF5JNF
    ͷ૊Έ߹Θͤͷ࣌ʹݺ͹ΕΔ
91. ϨΠΞ΢τΛॻ͘ <layout>
 <data>
 <variable
 name="now"
 type="org.threeten.bp.ZonedDateTime" />
 </data>
 <TextView android:text="@{now}"/>
 </layout>
92. ϨΠΞ΢τΛॻ͘ <layout>
 <data>
 <variable
 name="now"
 type="org.threeten.bp.ZonedDateTime" />
 </data>
 <TextView android:text="@{now}"/>
 </layout> ஋ΛόΠϯυ͢Δ͚ͩͰ0,
93. ஋Ληοτ͢Δ class NowActivity : AppCompatActivity() {
 
 val binding : ActivityNowBinding by lazy {
 DataBindingUtil.setContentView<ActivityNowBinding>(this, R.layout.activity_now)
 }
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.now = ZonedDateTime.now()
 }
 }
94. ஋Ληοτ͢Δ class NowActivity : AppCompatActivity() {
 
 val binding : ActivityNowBinding by lazy {
 DataBindingUtil.setContentView<ActivityNowBinding>(this, R.layout.activity_now)
 }
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.now = ZonedDateTime.now()
 }
 } ஋Ληοτ͢Δ
95. Value converter
96. ಛఆͷΫϥεͷ஋Λ ViewʹઃఆͰ͖Δ஋ ʹม׵͢Δ࢓૊Έ
97. KotlinͰఆٛͯ͠΋ Data Binding Libraryͷ ίϯύΠϥʔ͕ೝࣝ͠ͳ͍
98. JavaͰॻ͖·͠ΐ͏
99. BindingAdapterΛఆٛ public class Converters {
 @BindingConversion
 public static ColorDrawable convertColorStringToColor(String colorString) {
 return new ColorDrawable(Color.parseColor(colorString));
 }
 }

100. BindingAdapterΛఆٛ public class Converters {
 @BindingConversion
 public static ColorDrawable convertColorStringToColor(String colorString) {
 return new ColorDrawable(Color.parseColor(colorString));
 }
 }
 $PMPS%SBXBCMF͕ηοτͰ͖Δଐੑʹ
     4USJOHΛόΠϯυ͠Α͏ͱͨ࣌͠ʹݺ͹ΕΔ
101. ϨΠΞ΢τΛॻ͘ <layout>
 <data>
 <variable name="backgroundColor" type="String"/>
 </data>
 <View
 android:background="@{backgroundColor}"/>
 </layout>
102. ϨΠΞ΢τΛॻ͘ <layout>
 <data>
 <variable name="backgroundColor" type="String"/>
 </data>
 <View
 android:background="@{backgroundColor}"/>
 </layout> ஋ΛόΠϯυ͢Δ͚ͩͰ0,
103. ஋Ληοτ͢Δ class ColoredActivity : AppCompatActivity() {
 
 val binding : ActivityColoredBinding by lazy {
 DataBindingUtil.setContentView<ActivityColoredBinding>(this, R.layout.activity_colored)
 }
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.backgroundColor = "#00FF00"
 }
 }

104. ஋Ληοτ͢Δ class ColoredActivity : AppCompatActivity() {
 
 val binding : ActivityColoredBinding by lazy {
 DataBindingUtil.setContentView<ActivityColoredBinding>(this, R.layout.activity_colored)
 }
 
 override fun onCreate(savedInstanceState: Bundle?) {
 super.onCreate(savedInstanceState)
 binding.backgroundColor = "#00FF00"
 }
 }
 ஋Ληοτ͢Δ
106. example : github.com/ takuji31/ KotlinDataBinding
107. Realm
108. Post SQLite ͳ ϞόΠϧ޲͚ DBϥΠϒϥϦʔ
109. ࣌ؒͳ͍ͷͰলུ
110. github.com/realm/ realm-java/tree/ master/examples/ kotlinExample
111. Orma
112. AnnotationͰఆٛΛ ॻΔAndroid޲͚ͷ O/R mapper
113. ※Dagger2ͱ࢖͏৔߹͸ɺ ModuleΛJavaͰॻ͔ͳ͍ͱ ੜ੒͞ΕͨϑΝΠϧΛೝࣝͰ ͖ͳ͍
114. ࣌ؒͳ͍ͷͰলུ
115. github.com/gfx/ Orma-Kotlin-Example
116. Kotlinͷ ϥΠϒϥϦʔ Λ࢖͏
117. anko
118. JetBrains੡ͷ Android༻ ศརϥΠϒϥϦʔ
119. DSLʹΑΔViewఆٛ (Android Studioͷ ϨΠΞ΢τϓϨϏϡʔରԠ)
120. AndroidͷContext ΁ͷศར֦ு (GenericsͰIntentੜ੒ɺ Α͘࢖͏Intentੜ੒ؔ਺ͳͲ)
121. SQLiteͷϔϧύʔ
122. ͳͲͳͲ
123. DSL͸Data Binding Libraryͱ͸૊Έ߹Θ ͤΒΕͳ͍
124. github.com/Kotlin/ anko
125. Koreference
126. SharedPreferencesͷ஋ʹϓ ϩύςΟʔΞΫηε͢ΔͨΊ ͷϥΠϒϥϦʔ
127. ಛ௃ • ؆୯ʹ Preference model తͳ΋ͷΛॻ͚Δ • Null-SafeͳSharedPreference • جຊతͳSharedPreferencesͷܕΛαϙʔτ • ֦ுՄೳͳDelegated Property • Gson αϙʔτ͋Γ
128. Easy to make Preference model public class MyPreference( pref : SharedPreferences ) : SharedPreferences by pref {
 public var name : String by stringPreference("")
 }
129. Null-Safe SharedPreferences public class MyPreference( pref : SharedPreferences ) : SharedPreferences by pref {
 public var firstName : String by stringPreference("")
 public var lastName : String by stringPreference("")
 public var middleName : String? by nullableStringPreference(null)
 }
130. All Preference type support public class MyPreference(pref : SharedPreferences) : SharedPreferences by pref {
 public var stringValue : String by stringPreference("default value")
 public var intValue : Int by intPreference(256)
 public var longValue : Long by longPreference(256L)
 public var floatValue : Float by floatPreference(12.34f)
 public var boolValue : Boolean by booleanPreference(true)
 public var stringSetValue : Set<String> by stringSetPreference(setOf()) public var stringValue : String? by nullableStringPreference()
 public var stringSetValue : Set<String>? by nullableStringSetPreference() 
 }
131. Easy to create custom delegate property public class ByteArrayPreference( default : ByteArray = byteArrayOf(), name : String? = null ) : KoreferenceDelegate<ByteArray, String>(default,name), StringPreference {
 override fun toModelValue(value: String): ByteArray {
 return Base64.decode(value, Base64.DEFAULT)
 }
 
 override fun toPreferenceValue(value: ByteArray): String {
 return Base64.encodeToString(value, Base64.DEFAULT)
 }
 }
132. Easy to create custom delegate property public class RealmPreference( pref : SharedPreferences ) : SharedPreferences by pref {
 var encryptionKey : ByteArray by ByteArrayPreference()
 } val pref = getSharedPreferences("realm",Context.MODE_PRIVATE)
 val model = RealmPreference(pref)
 model.encryptionKey
133. github.com/takuji31/ Koreference
134. ·ͱΊ • AndroidͰKotlinΛ࢖͏ͷ͸ݱ࣮తʹͳΓͭͭ͋Δ • JavaͷϥΠϒϥϦʔ͸͍͍ͩͨͦͷ··࢖͑Δ • APTΛ࢖͏ϥΠϒϥϦʔ΋Ұ෦Λআ͍ͯී௨ʹ࢖͑Δ • Kotlinಛ༗ͷػೳΛར༻ͨ͠ϥΠϒϥϦʔͰ΋ͬͱॻ ͖΍͘͢Ͱ͖Δ
135. ؔ੢Kotlinษڧձ ఆظ։࠵͢Δͧʂ
136. ଓใΛ͓଴͍ͪͩ͘͞
137. Enjoy Kotlin Android life!