(Android™) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

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.

    boolean success = true;

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope.

    // The access token (and refresh token) was previously saved to a JSON file with this format:
    // See Get Google Drive OAuth2 Access Token

    // {
    //   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
    //   "expires_in": 3600,
    //   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
    //   "scope": "https://www.googleapis.com/auth/drive",
    //   "token_type": "Bearer"
    // }

    CkJsonObject json = new CkJsonObject();
    String tokenFilePath = "qa_data/tokens/googleDrive.json";
    json.LoadFile(tokenFilePath);

    CkOAuth2 oauth2 = new CkOAuth2();
    oauth2.put_AccessToken(json.stringOf("access_token"));
    oauth2.put_RefreshToken(json.stringOf("refresh_token"));

    oauth2.put_AuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth");
    oauth2.put_TokenEndpoint("https://www.googleapis.com/oauth2/v4/token");

    //  Replace these with actual values.
    oauth2.put_ClientId("GOOGLE-CLIENT-ID");
    oauth2.put_ClientSecret("GOOGLE-CLIENT-SECRET");
    oauth2.put_Scope("https://www.googleapis.com/auth/drive");

    // Use OAuth2 to refresh the access token.
    success = oauth2.RefreshAccessToken();
    if (success != true) {
        Log.i(TAG, oauth2.lastErrorText());
        return;
        }

    Log.i(TAG, oauth2.accessTokenResponse());

    // Save the new access token to our JSON file (so we can refresh it again when needed).
    json.UpdateString("access_token",oauth2.accessToken());

    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile(tokenFilePath,json.emit(),"utf-8",false);

    Log.i(TAG, "Access Token Refreshed!");

  }

  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."
  }
}