我无法处理JSON数据

Question

我正在尝试从API处理JSON数据，但我在logcat窗口中得到了此信息：301永久移动。

这是我的班级：公共类MainActivity扩展了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？