android - 主构造函数的 Kotlin Dagger2 错误

Question

我正在尝试学习 dagger 2，试图将基本的 java 示例转换为 kotlin 但无法这样做，因为我遇到了以下错误...

错误:Dagger 不支持注入(inject)私有(private)字段 私有(private) com.example.Engine 引擎；

这是运行良好的 Java 代码，

public class Car {

    private Engine engine;
    private Wheel wheel;

    @Inject
    public Car(Engine engine, Wheel wheel) {
        this.engine = engine;
        this.wheel = wheel;
    }
}

具有 2 个依赖项的 Car.java 类。

public class Engine {
    @Inject
    Engine(){}
}

public class Wheel {
    @Inject
    Wheel(){}
}

这是我的 Kotlin 代码:-

class Car(@Inject  var engine: Engine, @Inject  val wheels: Wheels) {
    fun drive(){
        Log.d("CAR","<<<<<< DRIVING >>>>>")
    }
}

class Engine @Inject constructor() {}

class Wheels @Inject constructor() {}

@Component
interface CarComponent {
    fun getCar() : Car
}

这是生成的代码

public final class Car {
    @org.jetbrains.annotations.NotNull()
    @javax.inject.Inject()
    private com.toi.roboelectric.Engine engine;
    @org.jetbrains.annotations.NotNull()
    @javax.inject.Inject()
    private final com.toi.roboelectric.Wheels wheels = null;

    public final void drive() {
    }

    @org.jetbrains.annotations.NotNull()
    public final com.toi.roboelectric.Engine getEngine() {
        return null;
    }

    public final void setEngine(@org.jetbrains.annotations.NotNull()
    com.toi.roboelectric.Engine p0) {
    }

    @org.jetbrains.annotations.NotNull()
    public final com.toi.roboelectric.Wheels getWheels() {
        return null;
    }

    public Car(@org.jetbrains.annotations.NotNull()
    com.toi.roboelectric.Engine engine, @org.jetbrains.annotations.NotNull()
    com.toi.roboelectric.Wheels wheels) {
        super();
    }
}

Answer 1

请将 Car Class 更新为

class Car @Inject constructor(var engine: Engine,val wheels: Wheels) {
fun drive(){
    Log.d("CAR","<<<<<< DRIVING >>>>>")
}