無法訪問Nullable Dagger2 Android

我正在編寫一個應用程序，我正在使用Dagger2進行依賴注入。我是匕首的新手。我對它的工作原理感到困惑，我無法弄清楚如何使用這個庫。我已經嘗試在博客文章的幫助下寫下模塊和組件。我已經提到了該模塊的用途。如果我錯了，請糾正我。無法訪問Nullable Dagger2 Android

APP模塊和組件：應該產生在整個應用單一實例，我想用這個例子來訪問某些Android資源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(); 
}

實例化

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; 
} 
}

上面的代碼工作正常。我在下面的代碼中遇到問題

位置模塊和組件：如果我沒有以下模塊的構造函數，那麼可以嗎？

@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); 

}

我收到以下錯誤

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

在下面類使用@Inject後。如果我刪除@Inject，錯誤消失。

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); 

}

爲什麼我得到那個錯誤？任何幫助，將不勝感激。提前致謝。

來源

2017-07-18 nithesh1990

有一些缺失代碼片段。編譯時或執行時是否出錯？ – Jileshl

我正在編譯期間收到它，即當我在Android Studio中單擊運行應用程序時 – nithesh1990

您需要在您的組件.. 例如添加缺失的模塊，如果你從下面

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

刪除NetModule你會得到這個錯誤...

來源

2017-09-01 04:23:44 Max

無法訪問Nullable Dagger2 Android

回答

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