/** 從快取中獲取圖片 **/
	public Bitmap getImage(final String url) {
		final String path = getDirectory() + "/" + convertUrlToFileName(url);
		System.out.println("path:"+path);
		File file = new File(path);
		if (file.exists()) {


			try {


				Bitmap bmp = BitmapFactory.decodeFile(path);
				if (bmp == null) {
					file.delete();
				} else {
					updateFileTime(path);
					return bmp;
				}
			} catch (OutOfMemoryError err) {
				BitmapFactory.Options opts = new BitmapFactory.Options();
				opts.inSampleSize = 4;
				Bitmap bmp = BitmapFactory.decodeFile(path, opts);
				if (bmp == null) {
					file.delete();
				} else {
					updateFileTime(path);
					return bmp;
				}
			}
		}
		return null;
	}
 

opts.inSampleSize = 4;為壓縮4倍