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.
:)