Question

我还有一个小问题，我有一个标准格式的图片链接，但我需要在最后使用身份验证令牌来访问图像，因此每当我在我的webbrowser中输入正确的身份验证令牌图像时，都会自动下载。这是我的问题，我如何在android中将这样的图像下载到位图？因为使用

 final URL bitmapUrl = new URL(imageUrl);
 bitmap = BitmapFactory.decodeStream(bitmapUrl.openConnection().getInputStream());

不起作用......

Answer 1

private Bitmap getBitmap(String url) 
    {
        File f=fileCache.getFile(url);

        //from SD cache
        Bitmap b = decodeFile(f);
        if(b!=null)
            return b;

        //from web
        try {
            Bitmap bitmap=null;
            URL imageUrl = new URL(url);

            HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
            conn.setConnectTimeout(70000);
            conn.setReadTimeout(70000);
            conn.setRequestProperty("Auth_keyName", "Value");// if authentication required
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            Utils.CopyStream(is, os);
            os.close();
            conn.disconnect();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Throwable ex){
            ex.printStackTrace();
            if(ex instanceof OutOfMemoryError)
                memoryCache.clear();
            return null;
        }
    }

Answer 2

尝试此方法下载位图

    public Bitmap downloadBitmap(String src) {
    try {
        java.net.URL url = new java.net.URL(src);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap bmp= BitmapFactory.decodeStream(input);
        return bmp;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

Android从url下载位图

2 个答案: