Java tutorial
/* * Copyright 2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package net.dahanne.android.google.client; import org.springframework.social.connect.Connection; import org.springframework.social.connect.ConnectionRepository; import org.springframework.social.connect.DuplicateConnectionException; import org.springframework.social.google.api.Google; import org.springframework.social.google.connect.GoogleConnectionFactory; import org.springframework.social.oauth2.AccessGrant; import org.springframework.social.oauth2.GrantType; import org.springframework.social.oauth2.OAuth2Parameters; import android.content.Intent; import android.graphics.Bitmap; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Toast; /** * This class is based on the FacebookWebOAuthActivity by Roy Clarkson */ public class GoogleWebOAuthActivity extends AbstractWebViewActivity { private static final String TAG = GoogleWebOAuthActivity.class.getSimpleName(); private ConnectionRepository connectionRepository; private GoogleConnectionFactory connectionFactory; // *************************************** // Activity methods // *************************************** @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //javascript is mandatory getWebView().getSettings().setJavaScriptEnabled(true); // Using a custom web view client to capture the access token getWebView().setWebViewClient(new GoogleOAuthWebViewClient()); this.connectionRepository = getApplicationContext().getConnectionRepository(); this.connectionFactory = getApplicationContext().getGoogleConnectionFactory(); } @Override public void onStart() { super.onStart(); // display the Google authorization page getWebView().loadUrl(getAuthorizeUrl()); } // *************************************** // Private methods // *************************************** private String getAuthorizeUrl() { String redirectUri = getString(R.string.google_oauth_callback_url); String scope = getString(R.string.google_scope); // Generate the Google authorization url to be used in the browser or web view OAuth2Parameters params = new OAuth2Parameters(); params.setRedirectUri(redirectUri); params.setScope(scope); return this.connectionFactory.getOAuthOperations().buildAuthorizeUrl(GrantType.AUTHORIZATION_CODE, params); } private void displayGoogleOptions() { Intent intent = new Intent(); intent.setClass(this, GoogleActivity.class); startActivity(intent); finish(); } // *************************************** // Private classes // *************************************** private class GoogleOAuthWebViewClient extends WebViewClient { private static final String LOCALHOST = "localhost"; private static final String CODE = "code"; /* * The WebViewClient has another method called shouldOverridUrlLoading which does not capture the javascript * redirect to the success page. So we're using onPageStarted to capture the url. */ @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { // parse the captured url Uri uri = Uri.parse(url); // log the url : very interesting for debugging the OAuth workflow Log.d(TAG, url); /* * The WebViewClient is launched to load an URL from the provider that will ask the user whether or not he accepts our app to access his data. * Once the provider successfully gets the approval from the user, it will redirect this WebViewClient to the callback_uri, with a query parameter named "code" : this is the authorization code */ String host = uri.getHost(); String code = uri.getQueryParameter(CODE); // The WebViewClient is redirected to the callback_uri, let's trade the authorization code for the access token if (LOCALHOST.equals(host)) { if (!exchangeAuthorizationCodeForAccessToken.getStatus().equals(AsyncTask.Status.RUNNING)) { exchangeAuthorizationCodeForAccessToken.execute(code); Toast.makeText(getApplicationContext(), "Redirecting you to the app main activity", Toast.LENGTH_LONG).show(); //preparing to quit this activity for the main activity getWebView().setVisibility(View.INVISIBLE); } } } } private AsyncTask<String, Void, Void> exchangeAuthorizationCodeForAccessToken = new AsyncTask<String, Void, Void>() { private Exception exception; @Override protected Void doInBackground(String... params) { // executed by a background thread //params[0] should contain the authorization code try { AccessGrant exchangeForAccess = connectionFactory.getOAuthOperations().exchangeForAccess(params[0], getString(R.string.google_oauth_callback_url), null); Log.d(TAG, "AccessToken : " + exchangeForAccess.getAccessToken()); Log.d(TAG, "RefreshToken : " + exchangeForAccess.getRefreshToken()); Log.d(TAG, "ExpireTime : " + exchangeForAccess.getExpireTime()); Connection<Google> connection = connectionFactory.createConnection(exchangeForAccess); connectionRepository.addConnection(connection); } catch (DuplicateConnectionException e) { Log.e(TAG, "something went wrong when adding the accessToken to the connection repository", e); exception = e; } catch (Exception e) { Log.e(TAG, "something went wrong when adding the accessToken to the connection repository", e); exception = e; } return null; } @Override protected void onPostExecute(Void result) { // executed by the UI thread once the background thread is done getting the result if (exception != null) { Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show(); } // we go back to the main activity to display the options displayGoogleOptions(); } }; }