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Executors newFixedThreadPool

//package com.myspace.util; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.util.HashMap; import java.util.Map; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import android.graphics.drawable.Drawable; import android.os.Handler; import android.os.Message; import android.widget.ImageView; class MSDrawableManager {     private final Map<String, Drawable> drawableMap;     private ExecutorService executorService;     static MSDrawableManager instance;          static public MSDrawableManager getInstance() {       if (instance == null) {         synchronized(MSDrawableManager.class) {           if (instance == null) {             instance = new MSDrawableManager();            }         }       }         return instance;     }          private MSDrawableManager() {       drawableMap = new HashMap<String, Drawable>();       executorService = Executors.newFixedThreadPool(2);     }          public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {       if (drawableMap.containsKey(urlString)) {         imageView.setImageDrawable(drawableMap.get(urlString));       }              imageView.setImageDrawable(null);       final Handler handler = new Handler() {         @Override         public void handleMessage(Message message) {           imageView.setImageDrawable((Drawable) message.obj);         }       };       executorService.execute(new Runnable() {         public void run() {           Drawable drawable = fetchDrawable(urlString);           Message message = handler.obtainMessage(1, drawable);           handler.sendMessage(message);         }       });     }          public Drawable fetchDrawable(String urlString) {       if (drawableMap.containsKey(urlString)) {         return drawableMap.get(urlString);       }       try {         InputStream is = fetch(urlString);         Drawable drawable = Drawable.createFromStream(is, "src");         drawableMap.put(urlString, drawable);         return drawable;       } catch (Exception e) {         return null;        }     }     private InputStream fetch(String urlString) throws MalformedURLException, IOException {       DefaultHttpClient httpClient = new DefaultHttpClient();       HttpGet request = new HttpGet(urlString);       HttpResponse response = httpClient.execute(request);       return response.getEntity().getContent();     } }