Created
January 20, 2012 05:24
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Descarga en background una imagen y asignala a un ImageView de android
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| package com.onlyangel.libs; | |
| 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 BackgroundImage { | |
| private final Map<String, Drawable> drawableMap; | |
| public BackgroundImage() { | |
| drawableMap = new HashMap<String, Drawable>(); | |
| } | |
| public Drawable fetchImage(String urlString) { | |
| if (drawableMap.containsKey(urlString)) { | |
| return drawableMap.get(urlString); | |
| } | |
| try { | |
| InputStream is = fetch(urlString); | |
| Drawable drawable = Drawable.createFromStream(is, "src"); | |
| if (drawable != null) { | |
| drawableMap.put(urlString, drawable); | |
| } else { | |
| Log.w(this.getClass().getSimpleName(), "Can't get the Image"); | |
| } | |
| return drawable; | |
| } catch (MalformedURLException e) { | |
| Log.e(this.getClass().getSimpleName(), "fetchImage failed", e); | |
| return null; | |
| } catch (IOException e) { | |
| Log.e(this.getClass().getSimpleName(), "fetchImage failed", e); | |
| return null; | |
| } | |
| } | |
| public void fetchImageOnThread(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) { | |
| imageView.setImageDrawable((Drawable) message.obj); | |
| } | |
| }; | |
| Thread thread = new Thread() { | |
| @Override | |
| public void run() { | |
| //TODO : set imageView to a "pending" image | |
| Drawable drawable = fetchImage(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(); | |
| } | |
| } |
Esta buena la libreria men gracias
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Vientos Bro,
Pero yo mejor Uso esta liberia http://loopj.com/android-async-http/
Para evitarme el codigo de plomeria necesario para que los Threads no se bloquen.
:)