How to get an array of links to photo VK API?

Question

Android

I'm trying to get an array of photos from VK and display them in a GridView. Before that, I displayed images in the GridView using an array of links (imageResIds) specified manually. Now I want to get an array of links from VKRequest, but the imageResIds array is always empty. Tell me how to do it right.

public class BouquetFragment extends Fragment implements AdapterView.OnItemClickListener {

    private ImageAdapter mAdapter;
    public String[] imageResIds = new String[10];
    public VKPhotoArray vkPhotoArray;

    public BouquetFragment() {
        // Required empty public constructor
    }

    private class DownLoadImageTask extends AsyncTask<String,Void,Bitmap> {
        ImageView imageView;

        public DownLoadImageTask(ImageView imageView){
            this.imageView = imageView;
        }

        //Override this method to perform a computation on a background thread.
        protected Bitmap doInBackground(String...urls){
            String urlOfImage = urls[0];
            Bitmap logo = null;
            try{
                InputStream is = new URL(urlOfImage).openStream();

                //Decode an input stream into a bitmap.
                logo = BitmapFactory.decodeStream(is);
            }catch(Exception e){ // Catch the download exception
                e.printStackTrace();
            }
            return logo;
        }

        //Runs on the UI thread after doInBackground(Params...).
        protected void onPostExecute(Bitmap result){
            imageView.setImageBitmap(result);
        }
    }


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mAdapter = new ImageAdapter(getActivity());
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        final View layout = inflater.inflate(R.layout.fragment_bouquet, container, false);
        final GridView mGridView = (GridView) layout.findViewById(R.id.image_grid);
        mGridView.setAdapter(mAdapter);
        mGridView.setOnItemClickListener(this);

        //get the photos from the VK
        VKRequest imageRequest = new VKRequest("photos.get", VKParameters.from(
                VKApiConst.OWNER_ID, "1",
                VKApiConst.ALBUM_ID, "136592355",
                VKApiConst.REV, "0",
                VKApiConst.EXTENDED, "0",
                VKApiConst.PHOTO_SIZES, "0",
                VKApiConst.COUNT, "5"),
                VKPhotoArray.class);

        imageRequest.executeWithListener(new VKRequest.VKRequestListener() {
            @Override
            public void onComplete(VKResponse response) {
                super.onComplete(response);

                vkPhotoArray = (VKPhotoArray) response.parsedModel;

                int i = 0;
                for (VKApiPhoto vkPhoto : vkPhotoArray) {

                    imageResIds[i] = vkPhoto.photo_130;
                    i++;
                }
            }
        });

        return layout;
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    }

    private class ImageAdapter extends BaseAdapter {

        private final Context mContext;

        public ImageAdapter (Context context) {
            super();
            mContext = context;
        }

        @Override
        public int getCount() {
            return imageResIds.length;
        }

        @Override
        public Object getItem(int position) {
            return imageResIds[position];
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            ImageView imageView;
            if (convertView == null) {
                imageView = new ImageView(mContext);
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setLayoutParams(new GridView.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
                ));
            } else {
                imageView = (ImageView) convertView;
            }

            new DownLoadImageTask(imageView).execute(imageResIds[position]);

            return imageView;
        }
    }
}

Answer 1

Figured it out myself. It was necessary to rewrite the imageRequest.executeWithListener method as follows:

imageRequest.executeWithListener(new VKRequest.VKRequestListener() {
            @Override
            public void onComplete(VKResponse response) {
                super.onComplete(response);

                vkPhotoArray = (VKPhotoArray) response.parsedModel;

                int i = 0;
                for (VKApiPhoto vkPhoto : vkPhotoArray) {
                    imageResIds[i] = vkPhoto.photo_130;
                    i++;
                }

                mAdapter = new ImageAdapter(getActivity());
                final GridView mGridView = (GridView) layout.findViewById(R.id.image_grid);
                mGridView.setAdapter(mAdapter);
            }
        });