无法访问Nullable Dagger2 Android

我正在编写一个应用程序，我正在使用Dagger2进行依赖注入。我是匕首的新手。我对它的工作原理感到困惑，我无法弄清楚如何使用这个库。我已经尝试在博客文章的帮助下写下模块和组件。我已经提到了该模块的用途。如果我错了，请纠正我。无法访问Nullable Dagger2 Android

APP模块和组件：应该产生在整个应用单一实例，我想用这个例子来访问某些Android资源AppComponent

的

@Module 
public class AppModule { 

private BaseApplication baseApplication; 

public AppModule(BaseApplication baseApplication){ 
    this.baseApplication = baseApplication; 
} 

@Provides 
@Singleton 
BaseApplication providesApplication(){ 
    return baseApplication; 
} 
} 

@Singleton 
@Component(modules = {AppModule.class}) 
public interface AppComponent { 
BaseApplication getBaseApplication(); 
}

实例化

public class BaseApplication extends Application { 

private AppComponent appComponent; 

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

    appComponent = DaggerAppComponent.builder().appModule(new 
AppModule(this)).build(); 
} 

public AppComponent getAppComponent(){ 
    return appComponent; 
} 
}

上面的代码工作正常。我在下面的代码中遇到问题

位置模块和组件：如果我没有以下模块的构造函数，那么可以吗？

@Module 
public class LocationModule { 

@IntDef(
     {LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY, 
     LocationRequest.PRIORITY_HIGH_ACCURACY, 
     LocationRequest.PRIORITY_LOW_POWER, 
     LocationRequest.PRIORITY_NO_POWER}) 
@Retention(RetentionPolicy.SOURCE) 
public @interface LocationPriority {} 

@Provides 
@Singleton 
@Named("default") 
LocationRequest providesLocationRequest(){ 
    return new LocationRequest() 
      .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY) 
      .setInterval(Constants.LOCATION_UPDATE_INTERVAL_MS) 

.setFastestInterval(Constants.LOCATION_UPDATE_FASTEST_INTERVAL_MS) 

.setSmallestDisplacement(Constants.LOCATION_UPDATE_DISPLACEMENT_METERS); 
} 

@Provides 
@Singleton 
@Named("custom") 
LocationRequest providesCustomLocationRequest(int interval, int 
fastestInterval, @LocationPriority int priority, float updateDisplacement) { 
    return new LocationRequest() 
      .setPriority(priority) 
      .setInterval(interval) 
      .setFastestInterval(fastestInterval) 
      .setSmallestDisplacement(updateDisplacement); 
} 

@Provides 
@Singleton 
LocationSettingsRequest providesLocationSettingsRequest(LocationRequest 
locationRequest){ 
    return new LocationSettingsRequest.Builder() 
      .addLocationRequest(locationRequest) 
      .build(); 
} 

@Provides 
@Singleton 
FusedLocationProviderClient providesFusedLocationClient(BaseApplication 
baseApplication){ 
    return LocationServices.getFusedLocationProviderClient(baseApplication); 
} 

@Provides 
@Singleton 
SettingsClient providesSettingsClient(BaseApplication baseApplication){ 
    return LocationServices.getSettingsClient(baseApplication); 
} 
} 


@Singleton 
@Component(modules = {LocationModule.class, AppModule.class}) 
public interface LocationComponent { 

**Do we Really need a method here?** 
void inject(GetLocationUseCase getLocationUseCase); 

}

我收到以下错误

error: cannot access Nullable class file for javax.annotation.Nullable not found

在下面类使用@Inject后。如果我删除@Inject，错误消失。

public final class GetLocationUseCase implements 
UseCaseContract.BusinessLogic { 


UseCaseContract.Mediator mediator; 

@Inject 
FusedLocationProviderClient fusedLocationProviderClientl; 

@Override 
public void onInitialize() { 

    BaseApplication application = mediator.requestUserContext(); 

    DaggerLocationComponent.builder().appModule(new 
AppModule(application)).locationModule(new 
LocationModule()).build().inject(this); 

}

为什么我得到那个错误？任何帮助，将不胜感激。提前致谢。

来源

2017-07-18 nithesh1990

有一些缺失代码片段。编译时或执行时是否出错？ – Jileshl

我正在编译期间收到它，即当我在Android Studio中单击运行应用程序时 – nithesh1990

您需要在您的组件.. 例如添加缺失的模块，如果你从下面

@Component(modules = {AppModule.class, NetModule.class, MainModule.class}) 
public interface AppComponent {

删除NetModule你会得到这个错误...

来源

2017-09-01 04:23:44 Max

无法访问Nullable Dagger2 Android

回答

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