在NonAndroid类中注入Dagger2 Android子组件

Question

学习Dagger2并且可能会在这里脱轨。我有一个类 - 在片段中可能需要或可能不需要的MapRoute。如果需要MapRoute，我想创建它，当MapRoute被实例化时，我想用应用程序级别创建的依赖项注入它。我也使用Builder模式填充MapRouter。

也许通用的问题是当你在nonAndroid类（不是Activity / Fragment / ...）时如何从上面注入依赖项？如何构建nonAndroid注入器代替AndroidInjection.inject（this）？

所以我的片段是：

public class ActivityMapFragment extends DaggerFragment ... {

 @Inject
    MapRoute.Builder mapRouteBuilder;

 private void plotRouteForMap(Cursor csr){
    MapRoute.Builder builder = new MapRoute.Builder();
    builder.setSupportMapFragment(supportMapFragment)
            .setLocationExerciseRecord(ler)
            .setMapType(mapType)
            .setUseCurrentLocationLabel(useCurrentLocationLabel)
            .setCursor(csr)
            .setTitle(activityTitle)
            .setActivityPhotosCallback(this);
    mapRoute = builder.build();
    mapRoute.plotGpsRoute();
}
...

MapRoute是：（编辑）添加了构建器代码段

public class MapRoute ... {

@Inject
public DisplayUnits displayUnits;   <<< Created at app level

@Inject
public PhotoUtils photoUtils;       <<<< Create at app level

 public MapRoute() {
    // Use subcomponent builder
    MapRouteSubcomponent component = 
    DaggerMapRouteSubComponent.builder().build();   <<< Want to do this
    component.inject(this);
}

 public static class Builder {
    SupportMapFragment supportMapFragment;
    LocationExerciseRecord ler;
    boolean useCurrentLocationLabel;
    int mapType;
    Cursor cursor;
    ActivityPhotosCallback activityPhotosCallback;
    String title;

    @Inject
    public Builder() {
    }
      public Builder setSupportMapFragment(SupportMapFragment supportMapFragment){
        this.supportMapFragment = supportMapFragment;
        return this;
    }
 ....

MapRouteSubcomponent最佳猜测：

@Subcomponent(modules = {MapRouteModule.class, ApplicationModule.class})

public interface MapRouteSubcomponent {

// allow to inject into our MapRoute class
void inject(MapRoute mapRoute);


@Subcomponent.Builder
interface Builder extends SubComponentBuilder<MapRouteSubcomponent> {
    Builder mapRouteModule(MapRouteModule mapRouteModule);
}


@Module
public class MapRouteModule {
    // What to put here?
}

最后是一个子组件构建器：

 // from https://github.com/Zorail/SubComponent/blob/master/app/src/main/java/zorail/rohan/com/subcomponent/SubComponentBuilder.java
public interface SubComponentBuilder<V> {
    V build();
}

此时我站在离开这里的地方。