(Android™) Calendar: Refresh Expired OAuth2 Access Token

Refreshes an expired OAuth2 access token.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/msGraphCalendar.json");
    if (success != true) {
        return;
        }

    CkHttpRequest req = new CkHttpRequest();
    req.AddParam("grant_type","refresh_token");
    req.AddParam("redirect_uri","http://localhost:3017/");
    req.AddParam("client_id","MICROSOFT-GRAPH-CLIENT-ID");
    req.AddParam("client_secret","MICROSOFT-GRAPH-CLIENT-SECRET");
    req.AddParam("refresh_token",json.stringOf("refresh_token"));
    req.AddParam("scope","openid profile offline_access user.readwrite calendars.readwrite files.readwrite");

    CkHttp http = new CkHttp();

    CkHttpResponse resp = http.PostUrlEncoded("https://login.microsoftonline.com/common/oauth2/v2.0/token",req);
    if (http.get_LastMethodSuccess() != true) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    // Load the JSON response.
    json.Load(resp.bodyStr());
    json.put_EmitCompact(false);

    // Show the JSON response.
    Log.i(TAG, json.emit());

    Log.i(TAG, "Response status code: " + String.valueOf(resp.get_StatusCode()));

    // If the response status code is not 200, then it's an error.
    if (resp.get_StatusCode() != 200) {
        return;
        }

    // Save the refreshed access token JSON to a file for future requests.
    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile("qa_data/tokens/msGraphCalendar.json",json.emit(),"utf-8",false);

    Log.i(TAG, "Success.");

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}