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更新：代码很好。这只是指向数据库的错误指针。

我正在使用 JSONParser 方法发出 http 请求以获取 JSON 数据并从数据库返回 JSONObject。获取 JSONObject 并显示名称和电子邮件等字符串没有问题，但它没有检索图像的 URL。我没有收到任何错误，但它只是显示空字段。

但是，如果我从

String imageURL = directory.getString(TAG_IMG);

对此

String imageURL = "http://mywebsite.com/images/photo1.png";

它工作正常。

//URL to make request
private static final String url_veiw_directory = "http://www.myweb.com/android/include/directory_detail_me.php";

private static final String TAG_SUCCESS = "success";
private static final String TAG_DIRECTORY = "directory";
private static final String TAG_ID = "user_id";
private static final String TAG_IMG = "photo"; // Image URLs stored in the DB
private static final String TAG_NAME = "name";
private static final String TAG_EMAIL = "email";

//Get JSONObject by httpRequest
JSONObject json = jsonParser.makeHttpRequest(url_veiw_directory, "GET", params);

Log.d("my profile", json.toString());

 if (success == 1) {

    JSONArray directoryObj = json.getJSONArray(TAG_DIRECTORY);  

    JSONObject directory = directoryObj.getJSONObject(0);

    //User Image                            
    int loader = R.drawable.loader; 

    String imageURL = directory.getString(TAG_IMG);                         
    ImageView imagePhoto = (ImageView) findViewById(R.id.photo);

    ImageLoader imgLoader = new ImageLoader(getApplicationContext());        
    imgLoader.DisplayImage(imageURL, loader, imagePhoto);

    //User Name and Email                           
    TextView txtName = (TextView) findViewById(R.id.name);
    TextView txtEmail = (TextView) findViewById(R.id.email);                            

    txtName.setText(directory.getString(TAG_NAME));
    txtEmail.setText(directory.getString(TAG_EMAIL));

//Image Loader Class

public void DisplayImage(String url, int loader, ImageView imageView)
    {
        stub_id = loader;
        imageViews.put(imageView, url);
        Bitmap bitmap=memoryCache.get(url);
        if(bitmap!=null)
            imageView.setImageBitmap(bitmap);
        else
        {
            queuePhoto(url, imageView);
            imageView.setImageResource(loader);
        }
    }

    private void queuePhoto(String url, ImageView imageView)
    {
        PhotoToLoad p=new PhotoToLoad(url, imageView);
        executorService.submit(new PhotosLoader(p));
    }

    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(30000);
            conn.setReadTimeout(30000);
            conn.setInstanceFollowRedirects(true);
            InputStream is=conn.getInputStream();
            OutputStream os = new FileOutputStream(f);
            ImageUtils.CopyStream(is, os);
            os.close();
            bitmap = decodeFile(f);
            return bitmap;
        } catch (Exception ex){
           ex.printStackTrace();
           return null;
        }
    }
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1 回答 1

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最可能的原因是imageURL字符串是空的，或者更有可能（因为您是从数据库中提取它）它被转义为使其无法用作 URL 的形式。我建议将其打印出来并查看您可能可以取消转义或进行一些字符替换的值

你可能会看到类似http%3A//mywebsite.com/images/photo1.png

于 2012-11-16T19:19:13.643 回答