public class main extends AppCompatActivity {
String oName[] = new String [];
int oAge [] = new int [];
int oHand [] = new int [];

protected void onCreate(Bundle savedInstanceState) {...}

private class DownloadTask extends AsyncTask<String, Integer, String> {
    @Override
    protected String doInBackground (String... values) {
        InputStream is = null;
        String result = ""; //Get json?
        String line;
        try {
            URL ua = new URL("https://api.myjson.com/bins/r5kim"); //json address
            HttpURLConnection conn = (HttpURLConnection) ua.openConnection();
            conn.setRequestMethod("GET");
            conn.connect();
            is = conn.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            while ((line = reader.readLine()) != null) {
                result += line;
            }
            is.close();
           JSONObject jo = new JSONObject(result); //get json
           JSONArray op = jo.getJSONArray("opponents"); //json array?? parse??
            for(int i = 0; i < op.length(); i++) {
                oName[i] = op.getJSONObject(i).getString("name"); //Get null
                oAge[i] = op.getJSONObject(i).getInt("age"); //Get null
                oHand[i] = op.getJSONObject(i).getInt("hand"); //Get null
                }
            } catch (MalformedURLException e) { //exception
                e.printStackTrace();
            } catch (IOException e) { //exception
                e.printStackTrace();
            } catch (JSONException e) { //exception
                e.printStackTrace();
            }
        return null;
    }