Android和Guice - 如何傳遞參數？

Question

我希望能夠注入一個對象，並將參數傳遞給它的初始化方法。 這可能嗎？

public class MyObject 
{ 
    @Inject 
    public MyObject(int anInteger) 
    { 
    //do something 
    } 
} 


public class MyActivity extends RoboActivity 
{ 
    @Inject (anInteger = 5) MyObject myObject; 
    // I want to be able to pass an object to be used when calling the 
    // initializer method 
} 

Answer 1

你應該可以用bindConstant()做到這一點，並相應地註釋它。例如，請參閱How do I inject configuration parameters?

Answer 2

public class MyModule extends AbstractModule 
{ 
    @Override 
    protected void configure() 
    { 
    bind(Integer.class). 
     annotatedWith(Names.named("my.object.an.integer")). 
     toInstance(500); 
    } 

    @Provides 
    @Named("an.integer.5") 
    public MyObject myObject5() 
    { 
    return createMyObject(5); 
    } 

    @Provides 
    @Named("an.integer.100") 
    public MyObject providesMyObject100() 
    { 
    return createMyObject(100); 
    } 

    private MyObject createMyObject(int anInteger) 
    { 
    MyObject result = new MyObject(anInteger); 
    // if there are any other fields/setters annotated with @Inject 
    requestInjection(result); 
    return result; 
    } 
} 


public class MyObject 
{ 
    public MyObject(int anInteger) 
    { 
    System.out.println("anInteger = " + anInteger); 
    } 
} 

public class User 
{ 
    @Inject 
    @Named("an.integer.5") 
    private field MyObject five; 

    @Inject 
    @Named("an.integer.100") 
    private field MyObject hundred; 
}