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Modern Java
Libraries with Kotlin
Keisuke Kobayashi / @kobakei
potatotips #40
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About me
• Keisuke Kobayashi
• GitHub, Qiita: @kobakei
• Twitter: @kobakei122
• Kyash, Inc
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No content
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ࠓ͢͜ͱ
• ݪଇJavaϥΠϒϥϦKotlinͰ
େମͦͷ··͑·͢
• Ұ෦ಛผʹରԠ͕ඞཁͳͷΛհ͠·͢
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Dagger2 + Orma
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Dagger2 + Orma
• kaptͰࣗಈੜ͞ΕΔΫϥεDaggerͰ
provideͰ͖ͳ͍
• ͭ·ΓOrmaDatabase
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NG: Ϗϧυ͕௨Βͳ͍
@Module
class AppModule(private val context: Context) {
@Singleton
@Provides
fun provideOrmaDatabase(context: Context): OrmaDatabase {
return OrmaDatabase.builder(context).build()
}
}
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ղܾࡦ
• OrmaDatabaseΛϥοϓ͢Δ͚ͩͷΫϥεΛ
࡞ͬͯɺͦΕΛprovide͢Δ
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OrmaHolder
class OrmaHolder(val context: Context) {
val ormaDatabase = OrmaDatabase.builder(context).build()
}
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Dagger Module
@Module
class AppModule(private val context: Context) {
@Singleton
@Provides
fun provideOrmaHolder(context: Context): OrmaHolder {
return OrmaHolder(context)
}
}
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Data Binding
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Data binding
• dependenciesʹkaptͰՃ
android {
dataBinding {
enabled true
}
}
dependencies {
kapt 'com.android.databinding:compiler:x.y.z'
}
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Parceler
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Parceler
• ParcelableͷϘΠϥʔϓϨʔτΛࣗಈੜ͢Δ
ϥΠϒϥϦ
• data classͰParcelerΛ͍͍ͨ
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data class
• toString, hasCodeͷ࣮ෆཁ
data class User (
val email: String?,
val userName: String?,
)
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data class with Parceler
• ͜Εͩͱಈ͔ͳ͍ʢϓϩύςΟ͋Δ͕ϑΟʔϧυ
Ͱͳ͍ͨΊʣ
@Parcel
data class User (
val email: String?,
val userName: String?,
)
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data class with Parceler
• ͜ΕͰϓϩύςΟܦ༝ͰಡΈॻ͖ͯ͘͠ΕΔ
@Parcel(Parcel.Serialization.BEAN)
data class User @ParcelConstructor constructor(
val email: String?,
val userName: String?,
)
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͓·͚: αϯϓϧॻ͖·ͨ͠
• https://github.com/kobakei/Android-Kotlin-
Example
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Thanks!