Android使用json从服务器下载图像

Question

我的应用程序包含几个按钮，我想要的是通过单击任何按钮，它会将我定向到一个 URL，该 URL 又将我带到一个 json 对象页面，然后为我提供要显示的图像源我的安卓设备。

例如:按钮 1 -> http://a.b.c.d/loadview.htm?buttonid=B1 -> Json 对象(img src- 图像文件的 url)-> 显示在我的 android 设备上。

提前致谢:)

Answer 1

这是工作代码:从服务器下载图像并在 android 中显示

public void onCreate(Bundle savedInstanceState) 

{ 

Bitmap bitmap = DownloadImage("http://www.aaa.com/images//29_13.jpeg");

ImageView img = (ImageView) findViewById(R.id.imagefromserver);

img.setImageBitmap(bitmap);

}


private InputStream OpenHttpConnection(String urlString) 
    throws IOException

 {

 InputStream in = null;

        int response = -1;

        URL url = new URL(urlString); 
        URLConnection conn = url.openConnection();

        if (!(conn instanceof HttpURLConnection))                     
            throw new IOException("Not an HTTP connection");

        try{
            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect(); 

            response = httpConn.getResponseCode();                 
            if (response == HttpURLConnection.HTTP_OK) {
                in = httpConn.getInputStream();                                 
            }                     
        }
        catch (Exception ex)
        {
            throw new IOException("Error connecting");            
        }
        return in;     
    }
    private Bitmap DownloadImage(String URL)
    {        
        Bitmap bitmap = null;
        InputStream in = null;        
        try {
            in = OpenHttpConnection(URL);
            bitmap = BitmapFactory.decodeStream(in);
            in.close();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        return bitmap;                
    }