什么类型应该是mLoaderManager以及如何声明它？

Question

这是从RxJava for Android App Development book, p.20使用RxJava加载程序的代码。什么类型应该是mLoaderManager以及如何声明它？

private static class LoaderInitOnSubscribe implements Observable.OnSubscribe<Story> { 
//... 
@Override 
public void call(final Subscriber<? super Story> subscriber) { 
    mLoaderManager.initLoader(LOADER_ID, mLoaderArgs, new LoaderCallbacks<Story>() { 
     @Override 
     public Loader<Story> onCreateLoader(int id, Bundleargs) { 
      return new StoryLoader(mContext); 
     } 
     @Override 
     public void onLoadFinished(Loader<Story> loader, Story data) { 
      subscriber.onNext(data); 
     } 
     @Override 
     public void onLoaderReset(Loader<Story> loader) {} 
    }); 
}} 

Answer 1

甲LoaderManager选自Activity经由getLoaderManager()或从Fragment经由getLoaderManager()获得。