/*** @title 异步加载图片* @author LiYa* @verson 1.0 Jan 30, 2012 10:44:41 AM*/
public final class PictureLoader {private Map<string mediametavo="">&gt; caches = new HashMap</string><string mediametavo="">&gt;();/*** 从sdcard中加载缩略图** @param path*            文件路径* @param callback*            回调* @return MediaMetaVo*/public MediaMetaVo loadBitmap(final String path,final PictureLoaderCallback callback) {if (caches.containsKey(path)) {MediaMetaVo metaVo = caches.get(path).get();if (metaVo != null) {return (metaVo);}}final Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {callback.bitmapCallback((MediaMetaVo) msg.obj);}};new Thread() {public void run() {MediaMetaVo vo = loadFormPath(path);caches.put(path, new SoftReference<mediametavo>(vo));handler.sendMessage(handler.obtainMessage(0, vo));};}.start();return null;}/*** 从路径加载图片** @param path* @return MediaMetaVo*/protected MediaMetaVo loadFormPath(String path) {MediaMetadataRetriever retriver = null;MediaMetaVo vo = new MediaMetaVo();try {retriver = new MediaMetadataRetriever();if (path.endsWith(SysUtils.MP3_SUFFIX)) {if (getSdk() &lt; 9) {retriver.setMode(MediaMetadataRetriever.MODE_GET_METADATA_ONLY);}retriver.setDataSource(path);String duration = retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);vo.duration = duration;} else if (path.endsWith(SysUtils.MP4_SUFFIX)) {if (getSdk() &lt; 9) {retriver.setMode(MediaMetadataRetriever.MODE_GET_METADATA_ONLY| MediaMetadataRetriever.MODE_CAPTURE_FRAME_ONLY);retriver.setDataSource(path);String duration = retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);vo.duration = duration;Bitmap bit = retriver.captureFrame();Bitmap nBitmap = Bitmap.createScaledBitmap(bit,SysUtils.PICTURE_WIDTH_DEFAULT,SysUtils.PICTURE_HEIGHT_DEFAULT, false);vo.coverPic = nBitmap;bit.recycle();} else {retriver.setDataSource(path);String duration = retriver.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);vo.duration = duration;Bitmap bitmap = retriver.getFrameAtTime();Bitmap nBitmap = Bitmap.createScaledBitmap(bitmap,SysUtils.PICTURE_WIDTH_DEFAULT,SysUtils.PICTURE_HEIGHT_DEFAULT, false);vo.coverPic = nBitmap;bitmap.recycle();}}} catch (Exception e) {e.printStackTrace();}return (vo);}/* ================================================ *//*** 得到系统版本** @return*/public static float SysVersion() {String ver = VERSION.RELEASE;if (ver.length() &gt; 3)ver = ver.substring(0, 3);float verF = Float.valueOf(ver);return verF;}public int getSdk() {float ver = SysVersion();if (ver &lt; = 1.6f)return Integer.valueOf(VERSION.SDK);else {VERSION_16 ver16 = new VERSION_16();return ver16.getSdk();}}private class VERSION_16 {public VERSION_16() {}public int getSdk() {return VERSION.SDK_INT;}}/* ================================================ */
}
</mediametavo></string>

/*** @title* @author LiYa* @verson 1.0 Jan 30, 2012 10:29:47 AM*/
public interface PictureLoaderCallback {/*** 更新ui状态* @param bitmap*/public void bitmapCallback(MediaMetaVo bitmap);
}