listview 中处理图片package com.wilson.android.library; /* Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ import java.io.IOException; public class DrawableManager { private final Map<String, Drawable> drawableMap; public DrawableManager() { drawableMap = new HashMap<String, Drawable>(); } public Drawable fetchDrawable(String urlString) { if (drawableMap.containsKey(urlString)) { return drawableMap.get(urlString); } Log.d(this.getClass().getSimpleName(), "image url:" + urlString); try { InputStream is = fetch(urlString); Drawable drawable = Drawable.createFromStream(is, "src"); if (drawable != null) { drawableMap.put(urlString, drawable); Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", " + drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", " + drawable.getMinimumHeight() + "," + drawable.getMinimumWidth()); } else { Log.w(this.getClass().getSimpleName(), "could not get thumbnail"); } return drawable; } catch (MalformedURLException e) { Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e); return null; } catch (IOException e) { Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e); return null; } } public void fetchDrawableOnThread(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 = fetchDrawable(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(); } }
