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    copied!<pre><code> package com.jaapp; import java.util.ArrayList; import android.app.Activity; import android.app.ProgressDialog; import android.content.Context; import android.content.Intent; import android.graphics.Color; import android.os.AsyncTask; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListView; import android.widget.TextView; import com.jaapp.application.JaappApplication; import com.jaapp.db.Jaappdb; import com.jaapp.dto.SubtypeDto; import com.jaapp.lazyloader.ImageLoader; public class SubTypeActivity extends Activity { ArrayList&lt;SubtypeDto&gt; arrylistsubtype = new ArrayList&lt;SubtypeDto&gt;(); ListView list; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.subtype); new subtypeAsyncTask().execute(); } public class subtypeAsyncTask extends AsyncTask&lt;Void, Void, Void&gt; { private ProgressDialog progrssdilaog; @Override protected void onPreExecute() { progrssdilaog = ProgressDialog.show(SubTypeActivity.this, "Please wait", "Loading Data ...", true); } @Override protected Void doInBackground(Void... params) { arrylistsubtype = Jaappdb.getSubtypeDtos(); return null; } @Override protected void onPostExecute(Void result) { progrssdilaog.dismiss(); list = (ListView) findViewById(R.id.list); list.setAdapter(new Listadatper(SubTypeActivity.this, arrylistsubtype)); } } public class Listadatper extends BaseAdapter { private Activity activity; public ImageLoader imageLoader; ArrayList&lt;SubtypeDto&gt; mlist; public int[] selected; public int countcolor = 0; public int i = 0; public String[] Colorname = { "#FFFF00", "#ACCC00" }; public Listadatper(SubTypeActivity secondActivity, ArrayList&lt;SubtypeDto&gt; arrylistsubtype) { this.activity = secondActivity; mlist = arrylistsubtype; selected = new int[mlist.size()]; for (int i = 0; i &lt; mlist.size(); i++) { selected[i] = 0; } } public View getView(final int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) activity .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View gridView; gridView = inflater.inflate(R.layout.list_row, null); TextView txt_name = (TextView) gridView .findViewById(R.id.txt_entrepreneur); ImageView img_icon = (ImageView) gridView .findViewById(R.id.img_entrepreneur); txt_name.setText(mlist.get(position).getName()); imageLoader = new ImageLoader(activity.getApplicationContext()); imageLoader.DisplayImage(getString(R.string.imagelink) + mlist.get(position).getLogo(), activity, img_icon); if(position % 2 == 0) { gridView.setBackgroundColor(Color.parseColor(Colorname[0])); } else { gridView.setBackgroundColor(Color.parseColor(Colorname[1])); } gridView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent i = new Intent(SubTypeActivity.this, SubOptionTypeActivity.class); JaappApplication.subtypeid = mlist.get(position).getId(); startActivity(i); } }); return gridView; } @Override public int getCount() { return mlist.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } } } ------------------------------------------------------------------------------------------ package com.jaapp.lazyloader; 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; import com.jaapp.R; public class ImageLoader { private HashMap&lt;String, Bitmap&gt; cache=new HashMap&lt;String, Bitmap&gt;(); private File cacheDir; public ImageLoader(Context context){ photoLoaderThread.setPriority(Thread.NORM_PRIORITY-1); 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) { photosQueue.Clean(imageView); PhotoToLoad p=new PhotoToLoad(url, imageView); synchronized(photosQueue.photosToLoad){ photosQueue.photosToLoad.push(p); photosQueue.photosToLoad.notifyAll(); } if(photoLoaderThread.getState()==Thread.State.NEW) photoLoaderThread.start(); } private Bitmap getBitmap(String url) { 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; 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; } } //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 { 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 } } } 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() { //clear memory cache cache.clear(); //clear SD cache File[] files=cacheDir.listFiles(); for(File f:files) f.delete(); } } ------------------------------------------------------------------------------------------ package com.jaapp.lazyloader; import java.io.InputStream; import java.io.OutputStream; public class Utils { public static void CopyStream(InputStream is, OutputStream os) { final int buffer_size=1024; try { byte[] bytes=new byte[buffer_size]; for(;;) { int count=is.read(bytes, 0, buffer_size); if(count==-1) break; os.write(bytes, 0, count); } } catch(Exception ex){} } } </code></pre>
 

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