[英]Dagger 2 inject singleton without module
I am using Dagger 2 injection to provide some dependency to client: 我正在使用Dagger 2注入为客户端提供一些依赖:
public class Dependency {
@Inject
Dependency() {
}
void check() {
System.out.print("Instantiated");
}
}
public class Client {
@Inject Dependency dependency;
Client() {
ClientComponent component = DaggerClientComponent.create();
component.inject(this);
}
void checkDependency() {
dependency.check();
}
}
@Component
public interface ClientComponent {
void inject(Client client);
}
public class Test {
public static void main(String... args) {
Client client = new Client();
client.checkDependency();
}
}
It works fine, but now I want to make my dependency singleton. 它工作正常,但现在我想让我的依赖单身。 How can I achieve it?
我怎样才能实现它? Should I create module for this dependency and annotate provide method with singleton annotation or I have another options to avoid module creation?
我应该为这个依赖项创建模块,并使用单例注释注释提供方法,或者我有其他选项来避免模块创建?
Add @Singleton on the top of your class and add @Singleton annotation to your component. 在类的顶部添加@Singleton并将@Singleton注释添加到组件中。
@Singleton
public class Dependency {
@Inject
Dependency() {
}
void check() {
System.out.print("Instantiated");
}
}
@Singleton
@Component
public interface ClientComponent {
void inject(Client client);
}
You should also move creation of your component to better place - onCreate method from app object is right place. 您还应该将组件的创建移动到更好的位置 - 来自app对象的onCreate方法是正确的位置。
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