URLImageParser.java

package com.aincc.lib.util;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.text.Html.ImageGetter;
import android.view.View;

/**
 * 
 * <h3><b>URLImageParser</b></h3></br>
 * 
 * HTML.fromHtml 에서 사용하기 위한 이미지 Getter
 * 
 * @author aincc@barusoft.com
 * @version 1.0.0
 * @since 1.0.0
 */
public class URLImageParser implements ImageGetter
{
	Context context;
	View container;

	/***
	 * Construct the URLImageParser which will execute AsyncTask and refresh the container
	 * 
	 * @param t
	 * @param c
	 */
	public URLImageParser(View t, Context context)
	{
		this.context = context;
		this.container = t;
	}

	public Drawable getDrawable(String source)
	{
		URLDrawable urlDrawable = new URLDrawable(context.getResources());

		// get the actual source
		ImageGetterAsyncTask asyncTask = new ImageGetterAsyncTask(urlDrawable);

		asyncTask.execute(source);

		// return reference to URLDrawable where I will change with actual image from
		// the src tag
		return urlDrawable;
	}

	public class ImageGetterAsyncTask extends AsyncTask<String, Void, Drawable>
	{
		URLDrawable urlDrawable;

		public ImageGetterAsyncTask(URLDrawable d)
		{
			this.urlDrawable = d;
		}

		@Override
		protected Drawable doInBackground(String... params)
		{
			String source = params[0];
			return fetchDrawable(source);
		}

		@Override
		protected void onPostExecute(Drawable result)
		{
			// 2012.09.08 aincc : NullPointerException
			if (null != result)
			{
				// set the correct bound according to the result from HTTP call
				urlDrawable.setBounds(0, 0, 0 + result.getIntrinsicWidth(), 0 + result.getIntrinsicHeight());

				// change the reference of the current drawable to the result
				// from the HTTP call
				urlDrawable.drawable = result;

				// redraw the image by invalidating the container
				URLImageParser.this.container.invalidate();
			}
			else
			{
				Logger.i("Failed fetch drawable.");
			}
		}

		/***
		 * Get the Drawable from URL
		 * 
		 * @param urlString
		 * @return
		 */
		public Drawable fetchDrawable(String urlString)
		{
			try
			{
				InputStream is = fetch(urlString);
				Drawable drawable = Drawable.createFromStream(is, "src");
				if (null != drawable)
				{
					drawable.setBounds(0, 0, 0 + drawable.getIntrinsicWidth(), 0 + drawable.getIntrinsicHeight());
				}
				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();
		}
	}
}