/**
 * 根據圖片的url路徑獲得Bitmap物件
 * @param url
 * @return
 */
private Bitmap returnBitmap(String url) {
    URL fileUrl = null;
    Bitmap bitmap = null;

    try {
        fileUrl = new URL(url);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }

    try {
        HttpURLConnection conn = (HttpURLConnection) fileUrl
                .openConnection();
        conn.setDoInput(true
 
);
        conn.connect();
        InputStream is = conn.getInputStream();
        bitmap = BitmapFactory.decodeStream(is);
        is.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return bitmap;

}