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    <p>Please copy the below class . That class is download the images from the web and stores into the memory card or into internal memory of application .</p> <pre><code>import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.util.HashMap; import java.util.Stack; import android.app.Activity; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.widget.ImageView; 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&lt;String, Bitmap&gt; cache = new HashMap&lt;String, Bitmap&gt;(); private File cacheDir = null; private Bitmap useThisBitmap = null; @SuppressWarnings("unused") private Context ctx = null; public Imageloader(Context context) { // Make the background thead low priority. This way it will not affect // the UI performance ctx = context; 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(),"DownloadImages/AlbumArt/"); else cacheDir = context.getCacheDir(); if (!cacheDir.exists()) cacheDir.mkdirs(); } public void DisplayImage(String url, Activity activity, ImageView imageView) { if(!url.equals("")) { if (cache.containsKey(url)) { imageView.setImageBitmap(cache.get(url)); } else { queuePhoto(url, activity, imageView); } } } 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(); } public Bitmap getBitmap(String url) { try { // 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; if(!url.equals("")){ InputStream is = new URL(url).openStream(); OutputStream os = new FileOutputStream(f); Utils.CopyStream(is, os); os.close(); bitmap = decodeFile(f); } return bitmap; } catch (Exception ex) { ex.printStackTrace(); return null; } } catch(Exception e) { e.printStackTrace(); return null; } } /*decodes image and scales it to reduce memory consumption * @param file path * @throws FileNotFoundException * @return bitmap * */ private Bitmap decodeFile(File f){ Bitmap b = null; try { useThisBitmap = null; //Decode image size BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; final int IMAGE_MAX_SIZE = 70; BitmapFactory.decodeStream(new FileInputStream(f), null, o); int scale = 2; if (o.outHeight &gt; IMAGE_MAX_SIZE || o.outWidth &gt; IMAGE_MAX_SIZE) { scale = 2 ^ (int) Math.ceil(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)); } //Decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = scale; b = BitmapFactory.decodeStream(new FileInputStream(f), null, o2); useThisBitmap = b; } catch (FileNotFoundException e) { } catch(Exception e) { e.printStackTrace(); } finally { System.gc(); } return useThisBitmap; } // Task for the queue private class PhotoToLoad { public String url; public ImageView imageView; public PhotoToLoad(String u, ImageView i) { url = u; imageView = i; } } private PhotosQueue photosQueue = new PhotosQueue(); // stores list of photos to download private class PhotosQueue { private Stack&lt;PhotoToLoad&gt; photosToLoad = new Stack&lt;PhotoToLoad&gt;(); // removes all instances of this ImageView private void Clean(ImageView image) { for (int j = 0; j &lt; photosToLoad.size();) { if (photosToLoad.get(j).imageView == image) photosToLoad.remove(j); else ++j; } } } private class PhotosLoader extends Thread { public void run() { try { while (true) { // thread waits until there are any images to load in the // queue if (photosQueue.photosToLoad.size() == 0) synchronized (photosQueue.photosToLoad) { photosQueue.photosToLoad.wait(); } if (photosQueue.photosToLoad.size() != 0) { PhotoToLoad photoToLoad; synchronized (photosQueue.photosToLoad) { photoToLoad = photosQueue.photosToLoad.pop(); } Bitmap bmp = getBitmap(photoToLoad.url); cache.put(photoToLoad.url, bmp); if (((String) photoToLoad.imageView.getTag()) .equals(photoToLoad.url)) { BitmapDisplayer bd = new BitmapDisplayer(bmp, photoToLoad.imageView); Activity a = (Activity) photoToLoad.imageView .getContext(); a.runOnUiThread(bd); } } if (Thread.interrupted()) break; } } catch (InterruptedException e) { // allow thread to exit } } } private PhotosLoader photoLoaderThread = new PhotosLoader(); // Used to display bitmap in the UI thread private class BitmapDisplayer implements Runnable { private Bitmap bitmap; private ImageView imageView; private BitmapDisplayer(Bitmap b, ImageView i) { bitmap = b; imageView = i; } public void run() { if (bitmap != null) imageView.setImageBitmap(bitmap); } } public void stopThread() { photoLoaderThread.interrupt(); } public void clearCache() { cache.clear(); File[] files = cacheDir.listFiles(); for (File f : files) f.delete(); } } </code></pre> <h2>Example</h2> <p>First create your image Loader class object.</p> <pre><code>Imageloader imageLoader = new Imageloader(getApplicationContext()); </code></pre> <p>then set the image url into the imageview's <code>setTag</code> Property.</p> <pre><code>imgImageView.setTag(Your Image Url); </code></pre> <p>then call your ImageLoader class Display image function . There are 3 parameters required.</p> <p>1) Image Url</p> <p>2) Your Current Class Name</p> <p>3) ImageView</p> <pre><code>imageLoader.DisplayImage(Your Image Url,ClassName.this,imgImageView); </code></pre> <p>this functon dowload images from the web and stored into the memory and show from the memory.</p>
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    1. POwhich the smooth and fast way to load image from net in android list view!
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    1. USChirag Raval
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    1. COStoring it on SD is a very expensive operation in terms of time, because the file creation is slow. I would not do it unless it is strictly necessary.
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      1. USMister Smith
    2. COThanks chirag it's really helpful. i got very smooth loading of image using this.
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      1. USmilind
    3. COi dont think so that storing on Sd card is very expensive operation . this is preferable because if device's internal memory is very low then it creates problem to load the images..
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      1. USChirag Raval
 

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