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KotlinͱϞμϯͳϥΠϒϥϦʔ
ͰAndroidΞϓϦΛ࡞Δͬ
ͨ͘͡ (@takuji31)
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@takuji31
(Takuji Nishibayashi)
Application Engineer at Hatena
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Loves Kotlin
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KotlinͰΞϓϦ։ൃத
(ϓϥΠϕʔτͰ)
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AGENDA
• KotlinͰAndroidΞϓϦΛ࡞Δ
• KotlinͰJavaͷϥΠϒϥϦʔΛ͏
• KotlinͷϥΠϒϥϦʔΛ͏
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Kotlin 1.0.0 released
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Kotlin 1.0.1-2
released
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KotlinͰ
AndroidΞϓ
ϦΛ࡞Δ
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Android Java =
Java6 + α
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+ α
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Diamond operator
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Multi catch
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try-with-resources
(4.4~)
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ͭΒ͍
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Kotlin
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Null-safe
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Property
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Delegate
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Lambda expression
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Extension
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Smart cast
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ߴ͍Javaͱͷ
૬ޓӡ༻ੑ
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JetBrainsࣗମ͕
Androidαϙʔτʹྗ
ΛೖΕ͍ͯΔ
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࠷ߴ
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KotlinͰJava
ͷϥΠϒϥϦʔ
Λ͏
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Dagger2
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ίϯύΠϧλΠϜʹ
ґଘΛղܾ͢Δ
DIίϯςφ
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Component/Module
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Module͕
ґଘΛఏڙ
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Component͕
ґଘΛೖ
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KotlinͰͷ͍ํ
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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
}
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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
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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"15Ͱੜ͞ΕͨΫϥεΛ
,PUMJOͰѻ͑ΔΑ͏ʹ͢Δ
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Module
@Module
class AppModule(@get:Provides val context: Context) {
@Provides
fun notificationManager(context: Context)
: NotificationManager = context.getSystemService(
Context.NOTIFICATION_SERVICE) as NotificationManager
}
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Module
@Module
class AppModule(@get:Provides val context: Context) {
@Provides
fun notificationManager(context: Context)
: NotificationManager = context.getSystemService(
Context.NOTIFICATION_SERVICE) as NotificationManager
}
(FUUFSʹ1SPWJEFTBOOPUBUJPOΛ͚ͭΔ
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Module
@Module
class AppModule(@get:Provides val context: Context) {
@Provides
fun notificationManager(context: Context)
: NotificationManager = context.getSystemService(
Context.NOTIFICATION_SERVICE) as NotificationManager
}
(FUUFSʹ1SPWJEFTBOOPUBUJPOΛ͚ͭΔ
ґଘΛఏڙ͢Δϝιουʹ
1SPWJEFTBOOPUBUJPOΛ͚ͭΔ
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Component
@Component(modules = arrayOf(AppModule::class))
interface AppComponent {
val context: Context
val notificationManager: NotificationManager
fun inject(mainActivity: MainActivity)
}
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Component
@Component(modules = arrayOf(AppModule::class))
interface AppComponent {
val context: Context
val notificationManager: NotificationManager
fun inject(mainActivity: MainActivity)
}
औಘ͢ΔͨΊʹϓϩύςΟʔ
ϝιουͰΑ͍
ΛఆٛͰ͖Δ
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Component
@Component(modules = arrayOf(AppModule::class))
interface AppComponent {
val context: Context
val notificationManager: NotificationManager
fun inject(mainActivity: MainActivity)
}
औಘ͢ΔͨΊʹϓϩύςΟʔ
ϝιουͰΑ͍
ΛఆٛͰ͖Δ
ೖ͢ΔͨΊͷϝιουΛ
ఆٛ͢Δ
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Application class
class App : Application() {
val component : AppComponent by lazy {
DaggerAppComponent
.builder().appModule(AppModule(this)).build()
}
override fun onCreate() {
super.onCreate()
}
}
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Application class
class App : Application() {
val component : AppComponent by lazy {
DaggerAppComponent
.builder().appModule(AppModule(this)).build()
}
override fun onCreate() {
super.onCreate()
}
}
$PNQPOFOUΛอ࣋͢ΔͨΊͷ
ϓϩύςΟʔΛ࡞Δ
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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[ZΛ͏͜ͱͰ
ॳճΞΫηε࣌ʹॳظԽ
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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[ZΛ͏͜ͱͰ
ॳճΞΫηε࣌ʹॳظԽ
"15Ͱੜ͞ΕͨΫϥεΛ
࡞ͬͯฦ͢
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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)
}
}
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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)
}
}
*OKFDUBOOPUBUJPOΛ͚ͭͨ
QSPQFSUZϝιουʹґଘೖ͞ΕΔ
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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)
}
}
*OKFDUBOOPUBUJPOΛ͚ͭͨ
QSPQFSUZϝιουʹґଘೖ͞ΕΔ
MBUFJOJUΛ͚ͭΔ͜ͱͰॳظԽ͕ෆཁʹͳΓɺ
͔ͭϑΟʔϧυʹ+BWB͔ΒೖͰ͖ΔΑ͏ʹ
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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)
}
}
*OKFDUBOOPUBUJPOΛ͚ͭͨ
QSPQFSUZϝιουʹґଘೖ͞ΕΔ
MBUFJOJUΛ͚ͭΔ͜ͱͰॳظԽ͕ෆཁʹͳΓɺ
͔ͭϑΟʔϧυʹ+BWB͔ΒೖͰ͖ΔΑ͏ʹ
$PNQPOFOUͷJOKFDUϝιουʹରͷΠϯελϯε
Λ͢ BQQ"QQΛऔಘ͢Δ֦ுϓϩύςΟʔ
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Data Binding
Library
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Androidެࣜͷσʔ
λʔόΠϯσΟϯά
ϥΠϒϥϦʔ
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Android Studio
ʹΑΔαϙʔτ
(ίʔυิɺγϯ
λοΫεϋΠϥΠτ)
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Ұํ/ํͷόΠ
ϯσΟϯάαϙʔτ
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KotlinͰ
͑Δ
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build.gradle
android {
dataBinding {
enabled = true
}
}
dependencies {
kapt 'com.android.databinding:compiler:2.1.0-alpha5'
}
kapt {
generateStubs = true
}
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όΠϯυ͍ͨ͠ΫϥεΛ࡞Δ
data class User(val name: String, val birthDay: String?)
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ϨΠΞτͷXMLͰ
όΠϯσΟϯάΛఆٛ
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ϨΠΞτͷXML(Ұ෦ུ)
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛఆٛ
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛఆٛ
ఆٛͨ͠ϓϩύςΟʔ
ͦͷϓϩύςΟʔΛόΠ
ϯσΟϯά
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛఆٛ
+BWBಉ༷ʹJNQPSUՄೳ
ఆٛͨ͠ϓϩύςΟʔ
ͦͷϓϩύςΟʔΛόΠ
ϯσΟϯά
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛఆٛ
+BWBಉ༷ʹJNQPSUՄೳ
ఆٛͨ͠ϓϩύςΟʔ
ͦͷϓϩύςΟʔΛόΠ
ϯσΟϯά
Ұ෦ͷԋࢉࢠ͑Δ
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ϨΠΞτͷXML(Ұ෦ུ)
ϧʔτཁૉMBZPVU
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛఆٛ
+BWBಉ༷ʹJNQPSUՄೳ
ఆٛͨ͠ϓϩύςΟʔ
ͦͷϓϩύςΟʔΛόΠ
ϯσΟϯά
Ұ෦ͷԋࢉࢠ͑Δ
0O$MJDL-JTUFOFSઃఆՄ
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ఆٛΛݩʹAPTͰ
ΫϥεΛࣗಈੜ
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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(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
}
}
}
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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(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[ZOPU/VMMͷEFMFHBUFΛͬͯ
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛ༻ҙ͢ΔͱΑ͍
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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(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[ZOPU/VMMͷEFMFHBUFΛͬͯ
όΠϯσΟϯάΫϥεͷ
ϓϩύςΟʔΛ༻ҙ͢ΔͱΑ͍
ࣗಈੜ͞ΕΔΫϥεʹఆ໊ٛͨ͠લͱಉ
͡ϓϩύςΟʔ ਖ਼֬ʹTFUUFSHFUUFS
͕
ੜ͞ΕΔͷͰɺηοτ͢Δͱ͕ө͞Ε
Δ
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No content
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No content
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(ViewClass)findById(R.id.vi
ewId)͏ෆཁͰ͢
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Define binding
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Define binding
JEΛTOBLF@DBTF͔
MPXFS$BNFM$BTFͰఆٛ
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Field access
class MainActivity : AppCompatActivity() {
val binding : ActivityMainBinding by lazy
{DataBindingUtil.setContentView(this,
R.layout.activity_main)}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.recyclerView.layoutManager
= LinearLayoutManager(this)
}
}
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Field access
class MainActivity : AppCompatActivity() {
val binding : ActivityMainBinding by lazy
{DataBindingUtil.setContentView(this,
R.layout.activity_main)}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.recyclerView.layoutManager
= LinearLayoutManager(this)
}
}
MPXFS$BNFM$BTFͰϑΟʔϧ
υ͕ੜ͞ΕΔ
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Property observer
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มߋࢹՄೳͳσʔλʔΫϥε
class Counter : BaseObservable() {
@get:Bindable
var count : Int = 0
set(value) {
field = value
notifyPropertyChanged(BR.count)
}
}
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มߋࢹՄೳͳσʔλʔΫϥε
class Counter : BaseObservable() {
@get:Bindable
var count : Int = 0
set(value) {
field = value
notifyPropertyChanged(BR.count)
}
}
มߋࢹΛ͍ͨ͠߹
#BTF0CTFSWBCMFΛܧঝ
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มߋࢹՄೳͳσʔλʔΫϥε
class Counter : BaseObservable() {
@get:Bindable
var count : Int = 0
set(value) {
field = value
notifyPropertyChanged(BR.count)
}
}
มߋࢹΛ͍ͨ͠߹
#BTF0CTFSWBCMFΛܧঝ
ࢹ͍ͨ͠ϓϩύςΟʔͷ
HFUUFSʹ#JOEBCMF
BOOPUBUJPOΛ͚ͭΔ
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มߋࢹՄೳͳσʔλʔΫϥε
class Counter : BaseObservable() {
@get:Bindable
var count : Int = 0
set(value) {
field = value
notifyPropertyChanged(BR.count)
}
}
มߋࢹΛ͍ͨ͠߹
#BTF0CTFSWBCMFΛܧঝ
ࢹ͍ͨ͠ϓϩύςΟʔͷ
HFUUFSʹ#JOEBCMF
BOOPUBUJPOΛ͚ͭΔ
͕มߋ͞Εͨ͜ͱΛ௨
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όΠϯσΟϯάΛఆٛ
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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
}
}
}
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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
มߋ͕ө͞ΕΔ
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No content
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No content
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Binding adapter
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ViewͷଐੑʹΛ
ηοτ͢ΔॲཧΛఆٛ
͢ΔΈ
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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
}
}
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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
}
}
+WN4UBUJDBOOPUBUJPOΛ
͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ
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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
}
}
+WN4UBUJDBOOPUBUJPOΛ
͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ
BOESPJEUFYUଐੑΛ
ηοτͰ͖Δ
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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
}
}
+WN4UBUJDBOOPUBUJPOΛ
͚ͭΔ͜ͱͰTUBUJDϝιουͱͯ͠ఆٛ͞ΕΔ
BOESPJEUFYUଐੑΛ
ηοτͰ͖Δ
5FYU7JFXͱ;POFE%BUF5JNF
ͷΈ߹Θͤͷ࣌ʹݺΕΔ
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ϨΠΞτΛॻ͘
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ϨΠΞτΛॻ͘
ΛόΠϯυ͢Δ͚ͩͰ0,
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Ληοτ͢Δ
class NowActivity : AppCompatActivity() {
val binding : ActivityNowBinding by lazy {
DataBindingUtil.setContentView(this,
R.layout.activity_now)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.now = ZonedDateTime.now()
}
}
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Ληοτ͢Δ
class NowActivity : AppCompatActivity() {
val binding : ActivityNowBinding by lazy {
DataBindingUtil.setContentView(this,
R.layout.activity_now)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.now = ZonedDateTime.now()
}
}
Ληοτ͢Δ
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Value converter
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ಛఆͷΫϥεͷΛ
ViewʹઃఆͰ͖Δ
ʹม͢ΔΈ
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KotlinͰఆٛͯ͠
Data Binding Libraryͷ
ίϯύΠϥʔ͕ೝࣝ͠ͳ͍
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JavaͰॻ͖·͠ΐ͏
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BindingAdapterΛఆٛ
public class Converters {
@BindingConversion
public static ColorDrawable convertColorStringToColor(String
colorString) {
return new ColorDrawable(Color.parseColor(colorString));
}
}
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BindingAdapterΛఆٛ
public class Converters {
@BindingConversion
public static ColorDrawable convertColorStringToColor(String
colorString) {
return new ColorDrawable(Color.parseColor(colorString));
}
}
$PMPS%SBXBCMF͕ηοτͰ͖Δଐੑʹ
4USJOHΛόΠϯυ͠Α͏ͱͨ࣌͠ʹݺΕΔ
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ϨΠΞτΛॻ͘
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ϨΠΞτΛॻ͘
ΛόΠϯυ͢Δ͚ͩͰ0,
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Ληοτ͢Δ
class ColoredActivity : AppCompatActivity() {
val binding : ActivityColoredBinding by lazy {
DataBindingUtil.setContentView(this,
R.layout.activity_colored)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.backgroundColor = "#00FF00"
}
}
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Ληοτ͢Δ
class ColoredActivity : AppCompatActivity() {
val binding : ActivityColoredBinding by lazy {
DataBindingUtil.setContentView(this,
R.layout.activity_colored)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding.backgroundColor = "#00FF00"
}
}
Ληοτ͢Δ
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No content
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example :
github.com/
takuji31/
KotlinDataBinding
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Realm
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Post SQLite ͳ
ϞόΠϧ͚
DBϥΠϒϥϦʔ
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࣌ؒͳ͍ͷͰলུ
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github.com/realm/
realm-java/tree/
master/examples/
kotlinExample
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Orma
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AnnotationͰఆٛΛ
ॻΔAndroid͚ͷ
O/R mapper
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※Dagger2ͱ͏߹ɺ
ModuleΛJavaͰॻ͔ͳ͍ͱ
ੜ͞ΕͨϑΝΠϧΛೝࣝͰ
͖ͳ͍
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࣌ؒͳ͍ͷͰলུ
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github.com/gfx/
Orma-Kotlin-Example
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Kotlinͷ
ϥΠϒϥϦʔ
Λ͏
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anko
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JetBrainsͷ
Android༻
ศརϥΠϒϥϦʔ
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DSLʹΑΔViewఆٛ
(Android Studioͷ
ϨΠΞτϓϨϏϡʔରԠ)
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AndroidͷContext
ͷศར֦ு
(GenericsͰIntentੜɺ
Α͘͏IntentੜؔͳͲ)
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SQLiteͷϔϧύʔ
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ͳͲͳͲ
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DSLData Binding
LibraryͱΈ߹Θ
ͤΒΕͳ͍
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github.com/Kotlin/
anko
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Koreference
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SharedPreferencesͷʹϓ
ϩύςΟʔΞΫηε͢ΔͨΊ
ͷϥΠϒϥϦʔ
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ಛ
• ؆୯ʹ Preference model తͳͷΛॻ͚Δ
• Null-SafeͳSharedPreference
• جຊతͳSharedPreferencesͷܕΛαϙʔτ
• ֦ுՄೳͳDelegated Property
• Gson αϙʔτ͋Γ
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Easy to make Preference
model
public class MyPreference(
pref : SharedPreferences
) : SharedPreferences by pref {
public var name : String by stringPreference("")
}
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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)
}
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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 by
stringSetPreference(setOf())
public var stringValue : String? by nullableStringPreference()
public var stringSetValue : Set? by
nullableStringSetPreference()
}
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Easy to create custom
delegate property
public class ByteArrayPreference(
default : ByteArray = byteArrayOf(),
name : String? = null
) : KoreferenceDelegate(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)
}
}
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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
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github.com/takuji31/
Koreference
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·ͱΊ
• AndroidͰKotlinΛ͏ͷݱ࣮తʹͳΓͭͭ͋Δ
• JavaͷϥΠϒϥϦʔ͍͍ͩͨͦͷ··͑Δ
• APTΛ͏ϥΠϒϥϦʔҰ෦Λআ͍ͯී௨ʹ͑Δ
• Kotlinಛ༗ͷػೳΛར༻ͨ͠ϥΠϒϥϦʔͰͬͱॻ
͖͘͢Ͱ͖Δ
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ؔKotlinษڧձ
ఆظ։࠵͢Δͧʂ
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ଓใΛ͓͍ͪͩ͘͞
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Enjoy Kotlin
Android life!