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    <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.util.Log; 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; private Context ctx; 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); ctx = context; // 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(), ".abcde"); else cacheDir = context.getCacheDir(); if (!cacheDir.exists()) cacheDir.mkdirs(); } final int stub_id = R.drawable.no_image; 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(); } public Bitmap getBitmap(String urlString) { String filename = String.valueOf(urlString.substring(urlString .lastIndexOf("/") + 1)); File f = new File(cacheDir, filename); try { if (!f.exists()) { Bitmap bitmap = null; InputStream is = new URL(urlString).openStream(); OutputStream os = new FileOutputStream(f); Globals.CopyStream(is, os); os.close(); bitmap = decodeFile(f); return bitmap; } else { Bitmap bitmap = decodeFile(f); return bitmap; } } catch (Exception ex) { ex.printStackTrace(); Log.e(Data.LOG, ex.getMessage(), ex); Bitmap icon = BitmapFactory.decodeResource(ctx.getResources(), R.drawable.no_image); return icon; } } // 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 &lt; REQUIRED_SIZE || height_tmp / 2 &lt; REQUIRED_SIZE) break; width_tmp /= 2; height_tmp /= 2; scale++; } // decode with inSampleSize BitmapFactory.Options o2 = new BitmapFactory.Options(); o2.inSampleSize = scale; return BitmapFactory.decodeStream(new FileInputStream(f), null, o2); } catch (FileNotFoundException e) { } return null; } // Task for the queue private class PhotoToLoad { public String url; public ImageView imageView; public PhotoToLoad(String u, ImageView i) { url = u; imageView = i; } } PhotosQueue photosQueue = new PhotosQueue(); public void stopThread() { photoLoaderThread.interrupt(); } // stores list of photos to download class PhotosQueue { private Stack&lt;PhotoToLoad&gt; photosToLoad = new Stack&lt;PhotoToLoad&gt;(); // removes all instances of this ImageView public void Clean(ImageView image) { for (int j = 0; j &lt; photosToLoad.size();) { if (photosToLoad.get(j).imageView == image) photosToLoad.remove(j); else ++j; } } } class PhotosLoader extends Thread { @Override public void run() { try { while (true) { 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 (photoToLoad.url == null) { } else { 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 } } } PhotosLoader photoLoaderThread = new PhotosLoader(); // Used to display bitmap in the UI thread class BitmapDisplayer implements Runnable { Bitmap bitmap; ImageView imageView; public BitmapDisplayer(Bitmap b, ImageView i) { bitmap = b; imageView = i; } public void run() { if (bitmap != null) imageView.setImageBitmap(bitmap); else imageView.setImageResource(stub_id); } } public void clearCache() { cache.clear(); // clear SD cache File[] files = cacheDir.listFiles(); for (File f : files) f.delete(); } } </code></pre>
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    1. POAndroid Loading More Images in Listview
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    1. USPrashant Mishra
    1. USPrashant Mishra
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    1. COI've formatted your code, please check if it's all alright!
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      1. USBuffalo
    2. COThanks for editing it :)
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      1. USPrashant Mishra
    3. COyes its working fin but when i am frequently running application, its giving OutOfMemoryException(OOM), I think bitmap is not recycling. My question is how to regain bitmap memory and in android LruCache can we automatically recycle bitmap?
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      1. USRavikumar11
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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