(Android™) Get Google Account Info from OAuth2 Access Token

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In the Google OAuth2 authorization flow, an application can know the email address of the Google account used to authorize access by requesting and processing user information from the Google UserInfo endpoint after obtaining an 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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();
    boolean success;

    // Implements the following CURL command:

    // curl -H "Authorization: Bearer YOUR_ACCESS_TOKEN" https://www.googleapis.com/oauth2/v3/userinfo

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // Adds the "Authorization: Bearer YOUR_ACCESS_TOKEN" header.
    http.put_AuthToken("YOUR_ACCESS_TOKEN");

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    success = http.QuickGetSb("https://www.googleapis.com/oauth2/v3/userinfo",sbResponseBody);
    if (success == false) {
        Log.i(TAG, http.lastErrorText());
        return;
        }

    CkJsonObject jResp = new CkJsonObject();
    jResp.LoadSb(sbResponseBody);
    jResp.put_EmitCompact(false);

    Log.i(TAG, "Response Body:");
    Log.i(TAG, jResp.emit());

    int respStatusCode = http.get_LastStatus();
    Log.i(TAG, "Response Status Code = " + String.valueOf(respStatusCode));
    if (respStatusCode >= 400) {
        Log.i(TAG, "Response Header:");
        Log.i(TAG, http.lastHeader());
        Log.i(TAG, "Failed.");
        return;
        }

    // Sample JSON response:
    // (Sample code for parsing the JSON response is shown below)

    // {
    //   "sub": "112233445678901234567",
    //   "name": "John Doe",
    //   "given_name": "John",
    //   "family_name": "Doe",
    //   "profile": "https://plus.google.com/112233445678901234567",
    //   "picture": "https://lh3.googleusercontent.com/a-/AOh14GiU-EXAMPLE",
    //   "email": "johndoe@example.com",
    //   "email_verified": true,
    //   "locale": "en"
    // }

    // Sample code for parsing the JSON response...
    // Use the following online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    String v_sub = jResp.stringOf("sub");
    String name = jResp.stringOf("name");
    String given_name = jResp.stringOf("given_name");
    String family_name = jResp.stringOf("family_name");
    String profile = jResp.stringOf("profile");
    String picture = jResp.stringOf("picture");
    String email = jResp.stringOf("email");
    boolean email_verified = jResp.BoolOf("email_verified");
    String locale = jResp.stringOf("locale");

  }

  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."
  }
}