在Kotlin中使用注释处理Android框架 kapt

class Thermosiphon 
@Inject constructor(
        private val heater: Heater
) : Pump {
    // ……
}    

@Module
abstract class PumpModule {
    @Binds
    abstract fun providePump(pump: Thermosiphon): Pump
}
@Module(includes = arrayOf(PumpModule::class))
class DripCoffeeModule {
    @Provides @Singleton
    fun provideHeater(): Heater = ElectricHeater()
}

@Singleton
@Component(modules = arrayOf(DripCoffeeModule::class))
interface CoffeeShop {
    fun maker(): CoffeeMaker
}
fun main(args: Array<String>) {
    val coffee = DaggerCoffeeShop.builder().build()
    coffee.maker().brew()
}

dependencies {
  ...
  annotationProcessor "com.google.dagger:dagger-compiler:$dagger-version"
}

apply plugin: ‘kotlin-kapt‘
dependencies {
    ...
    kapt "com.google.dagger:dagger-compiler:$dagger-version"
}

apply plugin: ‘kotlin-kapt‘
dependencies {
    ...
    compile "com.jakewharton:butterknife:$butterknife-version"
    kapt "com.jakewharton:butterknife-compiler:$butterknife-version"
}

@BindView(R2.id.title) TextView title;

@BindView(R2.id.title)
lateinit var title: TextView

@OnClick(R2.id.hello)
internal fun sayHello() {
    Toast.makeText(this, "Hello, views!", LENGTH_SHORT).show()
}

hello.setOnClickListener {
    toast("Hello, views!")
}

android {
    ...
    dataBinding {
        enabled = true
    }
}

apply plugin: ‘kotlin-kapt‘
dependencies {
    kapt "com.android.databinding:compiler:$android_plugin_version"
}  

<data>
    <variable name="data" type="org.example.kotlin.databinding.WeatherData"/>
</data>

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@{data.imageUrl}"
    android:contentDescription="@string/image" />

class MainActivity : AppCompatActivity() {
    // ……
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val binding: ActivityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main)
        binding.data = weather//等同于 binding.setData(weather)
    }
}

<Button
    android:text="@string/next"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onClick="startOtherActivity" />

class MainActivity : AppCompatActivity() {
    // ……
    fun startOtherActivity(view: View) = startActivity<OtherActivity>()
}

startActivity<OtherActivity>("KEY" to "VALUE").

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:onClick="@{() -> presenter.onSaveClick(task)}" />

// 用 Kotlin 代码写的相同逻辑
button.setOnClickListener { presenter.onSaveClick(task) }

apply plugin: ‘kotlin-kapt‘
dependencies {
    kapt "com.github.raizlabs.dbflow:dbflow-processor:$dbflow_version"
    compile "com.github.raizlabs.dbflow:dbflow-core:$dbflow_version"
    compile "com.github.raizlabs.dbflow:dbflow:$dbflow_version"
}

@Table(name="users", database = AppDatabase::class)
class User: BaseModel() {
    @PrimaryKey(autoincrement = true)
    @Column(name = "id")
    var id: Long = 0
    @Column
    var name: String? = null
}

@Table(database = KotlinDatabase::class)
data class User(@PrimaryKey var id: Long = 0, @Column var name: String? = null)

dependencies {
    compile "com.github.raizlabs.dbflow:dbflow-kotlinextensions:$dbflow_version"
}

apply plugin: ‘kotlin-kapt‘
dependencies {
    ...
    kapt "frankiesardo:auto-parcel:$latest-version"
}

@AutoValue
abstract class Address : Parcelable {
    abstract fun coordinates(): DoubleArray
    abstract fun cityName(): String
    companion object {
        fun create(coordinates: DoubleArray, cityName: String): Address {
            return builder().coordinates(coordinates).cityName(cityName).build()
        }
        
        fun builder(): Builder = `$AutoValue_Address`.Builder()
    }
    
    @AutoValue.Builder
    interface Builder {
        fun coordinates(x: DoubleArray): Builder
        fun cityName(x: String): Builder
        fun build(): Address
    }
}