loading images from url in json to listview

Question

I\'d like to load images from json data which contains the url to these images into a listview,,, the class implementing the json data has the following code:

Answer 1

u have loading the image json parsing. u have use image loader.

Imageloader.java class

public class ImageLoader {

    //the simplest in-memory cache implementation. This should be replaced with something like SoftReference or BitmapOptions.inPurgeable(since 1.6)
    private HashMap cache=new HashMap();

    private File cacheDir;

    public ImageLoader(Context context){
        //Make the background thead low priority. This way it will not affect the UI performance
        photoLoaderThread.setPriority(Thread.NORM_PRIORITY-1);

        //Find the dir to save cached images
       if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
            cacheDir=new File(android.os.Environment.getExternalStorageDirectory(),"LazyList");
        else
            cacheDir=context.getCacheDir();
        if(!cacheDir.exists())
            cacheDir.mkdirs();
    }

    final int stub_id=R.drawable.stub;
    public void DisplayImage(String url, Activity activity, ImageView imageView)
    {
        if(cache.containsKey(url))
            imageView.setImageBitmap(cache.get(url));
        else
        {
            queuePhoto(url, activity, imageView);
            imageView.setImageResource(stub_id);
        }    
    }

    private void queuePhoto(String url, Activity activity, ImageView imageView)
    {
        //This ImageView may be used for other images before. So there may be some old tasks in the queue. We need to discard them. 
        photosQueue.Clean(imageView);
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        synchronized(photosQueue.photosToLoad){
            photosQueue.photosToLoad.push(p);
            photosQueue.photosToLoad.notifyAll();
        }        
        //start thread if it's not started yet
        if(photoLoaderThread.getState()==Thread.State.NEW)
            photoLoaderThread.start();
    }

    private Bitmap getBitmap(String url) 
    {

        //I identify images by hashcode. Not a perfect solution, good for the demo.
        String filename=String.valueOf(url.hashCode());
        File f=new File(cacheDir, filename);

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

        //from web
        try {
            Bitmap bitmap=null;
            DataInputStream input = null;
        //    InputStream is=new URL(url).openStream();
            String auth = android.util.Base64.encodeToString(("devneoauto" + ":" + "2kk0rnpnpvir")
                 .getBytes("UTF-8"), android.util.Base64.NO_WRAP);

            HttpClient client = new DefaultHttpClient();
            HttpGet getmethod = new HttpGet(url);

            getmethod.addHeader("Authorization", "Basic " + auth);
            getmethod.addHeader("X-ZFWS-Accept", "text/json");

            HttpResponse responseGet = client.execute(getmethod);
            HttpEntity resEntityGet = responseGet.getEntity();

            if (resEntityGet != null) {

                input = new DataInputStream(responseGet.getEntity().getContent());

            }

            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(input, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }

    //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=70;
            int width_tmp=o.outWidth, height_tmp=o.outHeight;
            int scale=1;
            while(true){
                if(width_tmp/2 photosToLoad=new Stack();

        //removes all instances of this ImageView
        public void Clean(ImageView image)
        {
            for(int j=0 ;j

This class use by this method imageloader.DisplayImage(UserSearchResponse.Book_image2.get(position), Book.this, Bookphoto);

where UsersearchResponse.Book.get(position) use for image url pasrsing for json 
Book.this for where this Activity in class for example Book is class 
    Bookphoto for where this is ImageView

I m sure this code help u