使用服务器JSON的Andr​​oid下载图像 [英] Android download image from server using json

问题描述

我的应用程序包含几个按钮，是通过点击任何按钮，我想要什么，就直接我到一个URL这反过来又带我到要显示上一个JSON对象页面，然后提供给我的图像源我的Andr​​oid设备。

my application contains few buttons, what i want is by clicking on any of the button, it will direct me to a URL which in turn take me to a json object page which then provide me an image source to be displayed on to my android device.

有关如：按钮1 - > HTTP：//abcd/loadview.htm buttonid = B1 - > JSON对象（IMG src- URL到图像文件） - >获取显示我的Andr​​oid设备上

For eg: Button 1 -> http://a.b.c.d/loadview.htm?buttonid=B1 -> Json object(img src- url to image file) -> get displayed on my android device.

在此先感谢：）

推荐答案

这是工作code：可从服务器下载图像和android的显示它

This is working code: To download the image from server and display it in android

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;                
    }

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