URLDrawable.java
public class URLDrawable extends BitmapDrawable { // the drawable that you need to set, you could set the initial drawing // with the loading image if you need to protected Drawable drawable; @Override public void draw(Canvas canvas) { // override the draw to facilitate refresh function later if(drawable != null) { drawable.draw(canvas); } }}URLImageParser.java
public class URLImageParser implements ImageGetter { Context c; View container; public URLImageParser(View t, Context c) { this.c = c; this.container = t; } public Drawable getDrawable(String source) { URLDrawable urlDrawable = new URLDrawable(); // 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) { // 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(); } public Drawable fetchDrawable(String urlString) { try { InputStream is = fetch(urlString); Drawable drawable = Drawable.createFromStream(is, "src"); 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(); } }}ImageGetter的用法
String html = "Hello " +"<img src='http://www.gravatar.com/avatar/" + "f9dd8b16d54f483f22c0b7a7e3d840f9?s=32&d=identicon&r=PG'/>" +" This is a test " +"<img src='http://www.gravatar.com/avatar/a9317e7f0a78bb10a980cadd9dd035c9?s=32&d=identicon&r=PG'/>";this.textView = (TextView)this.findViewById(R.id.textview);URLImageParser p = new URLImageParser(textView, this);Spanned htmlSpan = Html.fromHtml(html, p, null);textView.setText(htmlSpan);
