java - 使用 Roboguice 的 Android 工厂辅助注入(inject)不起作用

Question

我试图在构造函数中传递一些参数时注入(inject)一些类。为了实现这一目标，我发现这个问题( 1 ， 2 )说这可以通过使用工厂辅助注入(inject)来实现。这就是我的代码的样子，遵循提供的示例并在阅读相关文档后进行了一些修改。

gradle脚本

dependencies { 
    compile 'org.roboguice:roboguice:3.+'
    provided 'org.roboguice:roboblender:3.+'
    compile 'com.google.inject.extensions:guice-assistedinject:3.+' 
}

具有接受参数的创建方法的工厂接口(interface)

public interface ICustomObjectFactory {
    ICustomObject create(Callback callback);
}

实现接口(interface)的类

public class CustomObject implements ICustomObject {
    protected String name;

    @AssistedInject
    public CustomObject(@Assisted Callback callback){
       this.callback = callback;
    }
}

从 Aplication 类使用和调用的模块

public class SomeModule extends Module {

    @Override
    protected void configure() {
         install(new FactoryModuleBuilder()
            .implement(ICustomObject.class, CustomObject.class)
            .build(ICustomObjectFactory.class));
    }
}

从应用程序类注册的注入(inject)模块

@Override
public void onCreate() {
    super.onCreate();

    RoboGuice.getOrCreateBaseApplicationInjector(this, RoboGuice.DEFAULT_STAGE,
            RoboGuice.newDefaultRoboModule(this), new SomeModule(this));
}

工厂的使用

public class SomeClass implements Callback {

    @Inject ICustomObjectFactory factory;

    public SomeClass () {
        ICustomObject first = this.factory.create(this);
    }
}

像这样，当我尝试使用工厂时，我收到此错误，因为它已在 SomeClass 中使用

java.lang.IllegalStateException: Factories.create() factories cannot be used until they're initialized by Guice.
        at com.google.inject.internal.util.$Preconditions.checkState(Preconditions.java:142)
        at com.google.inject.assistedinject.FactoryProvider2.getBindingFromNewInjector(FactoryProvider2.java:564)
        at com.google.inject.assistedinject.FactoryProvider2.invoke(FactoryProvider2.java:625)
        at java.lang.reflect.Proxy.invoke(Proxy.java:397)
        at $Proxy12.create(Unknown Source)

有人知道为什么工厂没有初始化吗？我知道应该由模块初始化，并且我确信它被调用的模块。

我的代码和链接问题中的代码之间最显着的区别是，在问题中，构造函数用 @Inject 注释，而不是 @AssistedInject。在此修改之前，我在编译应用程序时遇到此错误。

Error:Execution failed for task ':app:compileDebugJavaWithJavac'. java.lang.ClassCastException: com.sun.tools.javac.code.Type cannot be cast to javax.lang.model.type.DeclaredType dle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.) Re-download dependencies and sync project (requires network)

The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem. Stop Gradle build processes (requires restart)

Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.

In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

也许这不是实现我需要的最佳方法。如果不是，有人能给我指出正确的方向吗？

谢谢大家的帮助

Answer 1

最后，我通过在 Application 类中添加 RoboGuice.setUseAnnotationDatabases(false) 来使其工作:

@Override
public void onCreate() {
    super.onCreate();

    RoboGuice.setUseAnnotationDatabases(false);
    RoboGuice.getOrCreateBaseApplicationInjector(this, RoboGuice.DEFAULT_STAGE,
            RoboGuice.newDefaultRoboModule(this), new SomeModule(this));
}