Lazy loading of dancing images.

src/com/studentersamfundet/app/network/ImageLoader.java

@@ -0,0 +1,57 @@
+package com.studentersamfundet.app.network;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.security.InvalidParameterException;
+import java.util.HashMap;
+import java.util.Map;
+
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.os.AsyncTask;
+import android.util.Log;
+import android.widget.ImageView;
+
+public class ImageLoader extends AsyncTask<String, Void, Drawable> {
+	public final static Map<String, Drawable> cache = new HashMap<String, Drawable>();
+	private final ImageView view;
+	
+	public ImageLoader(ImageView... views)  {
+		if (views.length > 1)
+			throw new InvalidParameterException("Too many arguments to the function!");
+		
+		this.view = views[0];
+	}
+		
+	@Override
+	protected Drawable doInBackground(String... params) {
+		if (params.length > 1)
+			throw new InvalidParameterException("Too many arguments to the function!");
+				
+		Drawable d = cache.get(params[0]);
+		if (d != null)
+			return d;
+		
+		try {
+			HttpURLConnection con = (HttpURLConnection)new URL(params[0]).openConnection();
+		    InputStream is = con.getInputStream();
+		    		
+			d = Drawable.createFromStream(is, params[0].toString());
+			cache.put(params[0], d);
+		} catch (IOException e) {
+			Log.e("DNSapp", "An exception has occured while downloading images!", e);
+		}
+		return d;
+	}
+	
+	@Override
+	protected void onPostExecute(Drawable result) {
+		super.onPostExecute(result);
+		
+		if (result != null && view != null) {
+			view.setImageDrawable(result);
+		}
+	}
+}