Question

我想从URL获取位图，如

"https://graph.facebook.com/100003506521332/picture"

我试过了how-i-can-display-images-from-url-in-blackberry。但它显示http错误302.It不显示位图。如何解决问题？。

Answer 1

String url = "https://graph.facebook.com/100003506521332/picture";
     try 
        {
            bitmap = globleDeclaration.getLiveImage(url, 50, 50);
            bitmapField.setBitmap(bitmap);
        }
        catch (IOException e) 
        {
            e.printStackTrace();
            Dialog.alert(e.getMessage());
        }





public Bitmap getLiveImage(String url,int width,int height) throws IOException
    {   
        Bitmap bitmap = null;
try  
        {  
             byte[] responseData = new byte[10000];  
               int length = 0;  
               StringBuffer rawResponse = new StringBuffer();  
            httpconnection = (HttpConnection) Connector.open(url, Connector.READ, true);  
            String location=httpconnection.getHeaderField("location");

                if(location!=null){
                     httpconnection = (HttpConnection) Connector.open(location, Connector.READ, true);  

                }else{
                     httpconnection = (HttpConnection) Connector.open(url, Connector.READ, true);  
                }


                inputStream = httpconnection.openInputStream();  


                    while (-1 != (length = inputStream.read(responseData)))  
                    {  
                     rawResponse.append(new String(responseData, 0, length));  
                    }  
                    int responseCode = httpconnection.getResponseCode();


                if (responseCode != HttpConnection.HTTP_OK)  
                {  
                    throw new IOException("HTTP response code: "  
                            + responseCode);  
                }  
                final String result = rawResponse.toString();

                 byte[] dataArray = result.getBytes();  
                 encodeImageBitmap = EncodedImage.createEncodedImage(dataArray, 0, dataArray.length); 

            }  
            catch (final Exception ex)  
            {  
             System.out.print("Exception (" + ex.getClass() + "): " + ex.getMessage());   
            }  
            finally  
            {  
                try  
                {  
                    inputStream.close();  
                    inputStream = null;  
                    httpconnection.close();  
                    httpconnection = null;  
                }  
                catch(Exception e){}  
            }


        return bitmap;
    }

Answer 2

如果您从上面的答案中提到的代码responce中获得了httpconnection = (HttpConnection) Connector.open(url, Connector.READ, true);，那么您也可以使用替代解决方案..

你可以在http://graph.facebook.com/100003506521332/?fields=picture&type=large传递你的身份证明，而不是像{"picture": "http://profile.ak.fbcdn.net/hprofile-ak-snc4/70678_100003506521332_1415569305_n.jpg"}那样得到一个json回复

解析这个json并得到你想要的exaclty ...而不是你将使用httpconnection = (HttpConnection) Connector.open(url, Connector.READ, true);得到答案。

如果您不想要larger图像而不是从上面的网址中移除&type=large。

Answer 3

//YOUR PACKAGE NAME
package ...........;
//*************************

import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;

import net.rim.device.api.system.Bitmap;

public class Util_ImageLoader {
    public static Bitmap getImageFromUrl(String url) {
        Bitmap bitmap = null;

        try {
            String bitmapData = getDataFromUrl(url);
            bitmap = Bitmap.createBitmapFromBytes(bitmapData.getBytes(), 0,
                    bitmapData.length(), 1);
        } catch (Exception e1) {
            e1.printStackTrace();
        }

        return bitmap;
    }

    private static String getDataFromUrl(String url) {
        StringBuffer b = new StringBuffer();
        InputStream is = null;
        HttpConnection c = null;

        long len = 0;
        int ch = 0;

        try {
            c = (HttpConnection) Connector.open(url);

            is = c.openInputStream();
            len = c.getLength();
            if (len != -1) {
                for (int i = 0; i < len; i++)
                    if ((ch = is.read()) != -1) {
                        b.append((char) ch);
                    }
            } else {
                while ((ch = is.read()) != -1) {
                    len = is.available();
                    b.append((char) ch);
                }
            }

            is.close();
            c.close();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return b.toString();
    }
}

将此复制到您的包裹.... 现在，要使用此类，请执行此操作＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;＆gt;

创建BITMAP对象：

Bitmap IMAGE;

之后：

IMAGE=Util_ImageLoader.getImageFromUrl("https://graph.facebook.com/100003506521332/picture");

顺便说一下，我觉得你错过了延期像你的网址上的JPG，PNG ....检查

现在，将您的位图添加到要显示图像的位置......

享受！

add(IMAGE);

如何在Blackberry中从URL获取位图

3 个答案: