Mega Code Archive

 

Categories / Android / 2D Graphics

 

Drawable Manager with Thread

//package com.sjtu.is.mobili.utils; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.util.HashMap; import java.util.Map; 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.util.Log; import android.widget.ImageView; public class DrawableManager {     private final Map<String, Drawable> drawableMap;     public DrawableManager() {         drawableMap = new HashMap<String, Drawable>();     }     public Drawable fetchDrawable(String urlString) {         if (drawableMap.containsKey(urlString)) {             return drawableMap.get(urlString);         }         Log.d(this.getClass().getSimpleName(), "image url:" + urlString);         try {             InputStream is = fetch(urlString);             Drawable drawable = Drawable.createFromStream(is, "src");             drawableMap.put(urlString, drawable);             //Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", "             //        + drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", "             //        + drawable.getMinimumHeight() + "," + drawable.getMinimumWidth());             return drawable;         } catch (MalformedURLException e) {             Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);             return null;         } catch (IOException e) {             Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);             return null;         }     }     public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {         if (drawableMap.containsKey(urlString)) {             imageView.setImageDrawable(drawableMap.get(urlString));         }         final Handler handler = new Handler() {             @Override             public void handleMessage(Message message) {               if (message.obj==null){                 Log.d("imageDownder", "image is null");               }else{                 imageView.setImageDrawable((Drawable) message.obj);               }             }         };         Thread thread = new Thread() {             @Override             public void run() {                 //TODO : set imageView to a "pending" image                 Drawable drawable = fetchDrawable(urlString);                 Message message = handler.obtainMessage(1, drawable);                 handler.sendMessage(message);             }         };         thread.start();     }     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();     } }