我无法处理openweathermap JSON数据

Question

我正在尝试从API（http://samples.openweathermap.org/data/2.5/weather?q=London,uk）处理JSON数据，但我在logcat窗口中获得了此数据：301 Moved Permanently

这是我的班级：

public class MainActivity extends AppCompatActivity {

    public class DownloadTask extends AsyncTask<String,Void,String> {

        @Override
        protected String doInBackground(String... urls) {
            String result = "";
            URL url;
            HttpURLConnection urlConnection;
            try {
                url = new URL(urls[0]);
                urlConnection = (HttpURLConnection) url.openConnection();
                InputStream in = urlConnection.getInputStream();
                InputStreamReader reader = new InputStreamReader(in);
                int data = reader.read();

                while (data != -1) {
                    char current = (char) data;
                    result += current;
                    data = reader.read();
                }

                return result;


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

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Log.i("JSON",s);
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        DownloadTask task = new DownloadTask();
        task.execute("http://samples.openweathermap.org/data/2.5/weather?q=London,uk&appid=439d4b804bc8187953eb36d2a8c26a02");
    }
}

Answer 1

您是否已授予android studio权限使用AndroidManifest.xml中的INTERNET？