android using ViewPager to show images

Question

I'd like to download a bunch of images from web and then show them using my custom PagerAdapter. So I can slide to browse all of these images.

I define an activity named as PhotoSlideActivity which extends from FragmentActivity . In this activity, I have my own PagerAdapter . The following is my code:

    private class PhotoSlidePagerAdapter extends FragmentStatePagerAdapter {
        private final int mSize;

        public PhotoSlidePagerAdapter(FragmentManager fm, int size) {
            super(fm);
            mSize = size;
        }

        @Override
        public Fragment getItem(int position) {
            PhotoUrl photoUrl = new PhotoUrl(position);
            return PhotoSlidePageFragment.create(photoUrl.makePhotoUrl());
        }

        @Override
        public int getCount() {
            return mSize;
        }
    }

The following is my PhotoSlidePageFragment . mImageFetcher is a class which download images asynchronously.

   public class PhotoSlidePageFragment extends Fragment {

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
       final View v = inflater.inflate(R.layout.fragment_photo_slide_page, container, false);
       mImageView = (ImageView) v.findViewById(R.id.imageView1);
   }

   @Override
   public void onActivityCreated(Bundle savedInstanceState) {
       super.onActivityCreated(savedInstanceState);

       // Use the parent activity to load the image asynchronously into the ImageView
       if (PhotoSlideActivity.class.isInstance(getActivity())) {
          mImageFetcher = ((PhotoSlideActivity) getActivity()).getImageFetcher();
          mImageFetcher.loadImage(mImageUrl, mImageView);
       }
   }

(1) My original idea is to put mImageFetcher.loadImage(mImageUrl, mImageView); in onCreateView . Is there any difference between putting it in onCreateView and in onActivityCreated ?

(2) What if I replace what I did in onActivityCreated with mImageFetcher = new ImageFetcher(); mImageFetcher.loadImage(mImageUrl, mImageView); mImageFetcher = new ImageFetcher(); mImageFetcher.loadImage(mImageUrl, mImageView); ? Doing this means use Fragment to load the image asynchronously. Is there any bad effects doing this?

Answer 1

Use can use LazyList for fetch data from the website(URL). download following example from Github

https://github.com/thest1/LazyList

and adapter data use in swipe change image example

https://github.com/chiuki/android-swipe-image-viewer