OpenWeather API图像无法显示

Question

我做了一个应用程序，可以告诉您进入该位置的天气..该API取自OpenWeatherMap.org并显示天气..我想显示图标，我也拿了图标ID并粘贴在链接..图像没有显示..

 try {

                DownloadTask downloadTask = new DownloadTask();

                String city = weatherInput.getText().toString();
                Log.i("City name",city);

                //used to encode the entered input for url.. for example San Fransisco appears in url
                //as San%20Fransisco ... and to enable that we use the encoder...
                String encodedCity = URLEncoder.encode(city,"UTF-8");

                downloadTask.execute("http://api.openweathermap.org/data/2.5/weather?q=" + encodedCity +
                        "&appid=cd66504ca815ddc1971662a9f2147f84");

                Log.i("Image id",icon);

                ImageDownloader imageDownloader = new ImageDownloader();
                myImage = imageDownloader
                        .execute("http://openweathermap.org/img/w/" + icon + ".png").get();
                imageView.setImageBitmap(myImage);

            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (InterruptedException e) {
                e.printStackTrace();
            } catch (ExecutionException e) {
                e.printStackTrace();
            }

        }
    });

这是ImageDownloader类。 图标是一个全局变量，当我使用其他变量（如天气状况）解析API时，我得到了。

 public class ImageDownloader extends AsyncTask<String, Void, Bitmap>{

    @Override
    protected Bitmap doInBackground(String... urls) {

        URL url;
        HttpURLConnection httpURLConnection;

        try {
            url = new URL(urls[0]);
            httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.connect();
            InputStream inputStream = httpURLConnection.getInputStream();
            return BitmapFactory.decodeStream(inputStream);

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

请注意我在一个Activity中有两个AsyncTask类，所以如果它导致一些错误..我不知道它..