Calling web API and Receive return value in Android

Question

I\'ve googled for that topics and don\'t get any useful information.

I want to use Web API in my android projects, but don\'t know how to call them from android or j

Answer 1

Since I just want to display the the User ID return from the API, below the solution is work for me.

public class MainActivity extends Activity {

    public static TextView txtUserid;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

                    Button btnUserid = (Button) findViewById(R.id.btnUserid);
        btnUserid.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                new UserNameToId().execute("https://uhunt.onlinejudge.org/api/uname2uid/almaruf");
            }
        });
    }

    protected class UserNameToId extends AsyncTask {
        @Override
        public String doInBackground(String... url) {

            try {
                URL Url = new URL(url[0]);
                URLConnection urlConnection = Url.openConnection();
                InputStream inputStream = urlConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                String str = "";
                str = bufferedReader.readLine();
                return str;
            } catch (Exception e) {
                e.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            txtUserid = (TextView) findViewById(R.id.txtUserId);
            txtUserid.setText(result);
        }
    }
}