Load Image in ImageView from URL stored in JSONString in Android

Question

I have a JSON string, say a name and a Url . I need to extract name into the TextView and extract and display image in ImageView. Belo

Answer 1

You can do something like this.

         public static final String JSON_STRING="{"WebImages":{"Imagename":"image_name","imageurl":http://www.example.com/image/example.png}}";
    private ImageLoader _ImageLoader;

                    try {
            JSONObject _jObj = new JSONObject(JSON_STRING);
            JSONObject _jSubObj = _jObj .getJSONObject("WebImages");
        String _imageName= _jSubObj.getString("Imagename");
YOUR_TEXTVIEW.setText(_imageName);
        String _imageURL= _jSubObj.getString("imageurl");
      _ImageLoader = new ImageLoader(CURRENT_ACTIVITY.this);
       _ImageLoader.DisplayImage(_imageURL,
                        R.drawable.ic_launcher, YOUR_IMAGEVIEW);
                } catch (JSONException e) {
                                        // TODO Auto-generated catch block

                                        e.printStackTrace();
                                    }


    public class ImageLoader {

        MemoryCache memoryCache=new MemoryCache();
        FileCache fileCache;
        private Map     imageViews=Collections.synchronizedMap(new WeakHashMap());
        ExecutorService executorService; 

        public ImageLoader(Context context){
            fileCache=new FileCache(context);
            executorService=Executors.newFixedThreadPool(5);
        }

        int stub_id = R.drawable.ic_launcher;
        public void DisplayImage(String url, int loader, ImageView imageView)
        {
            try {

                stub_id = loader;
                imageViews.put(imageView, url);
                Bitmap bitmap=memoryCache.get(url);
                if(bitmap!=null)
                    imageView.setImageBitmap(bitmap);
                else
                {
                    queuePhoto(url, imageView);

                    imageView.setImageResource(loader);


                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        private void queuePhoto(String url, ImageView imageView)
        {
            PhotoToLoad p=new PhotoToLoad(url, imageView);
            executorService.submit(new PhotosLoader(p));
        }

        public Bitmap getBitmap(String url)
        {
            File f=fileCache.getFile(url);

            //from SD cache
            Bitmap b = decodeFile(f);
            if(b!=null)
                return b;

            //from web
            try {
                Bitmap bitmap=null;
                URL imageUrl = new URL(url);
                HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
                conn.setConnectTimeout(30000);
                conn.setReadTimeout(30000);
                conn.setInstanceFollowRedirects(true);
                InputStream is=conn.getInputStream();
                OutputStream os = new FileOutputStream(f);
                Utils.CopyStream(is, os);
                os.close();
                bitmap = decodeFile(f);
                return bitmap;
            } catch (Exception ex){
                ex.printStackTrace();
                return null;
            }

        }

        public Bitmap getFacebookImage(String userId) {
            // TODO Auto-generated method stub
            Bitmap bitmap = null;

            try {

            HttpGet httpRequest = new HttpGet(
            URI.create(userId));
            HttpClient httpclient = new DefaultHttpClient();
            HttpResponse response = (HttpResponse) httpclient
            .execute(httpRequest);
            HttpEntity entity = response.getEntity();
            BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(
            entity);
            bitmap = BitmapFactory
            .decodeStream(bufHttpEntity
            .getContent());
            httpRequest.abort();

            } catch (Exception e) {
            e.printStackTrace();
            }
            return bitmap;
            }

        //decodes image and scales it to reduce memory consumption
        private Bitmap decodeFile(File f){
            try {
                //decode image size
                BitmapFactory.Options o = new BitmapFactory.Options();
                o.inJustDecodeBounds = true;
                BitmapFactory.decodeStream(new FileInputStream(f),null,o);

                //Find the correct scale value. It should be the power of 2.
            //  final int REQUIRED_SIZE=200;
            //  int width_tmp=o.outWidth, height_tmp=o.outHeight;
            //  int scale=1;
            //  while(true){
            //      if(width_tmp/2