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    <p>I didn't know about using Google Play services for OAuth 2.0 authentication, but after taking a quick look at it, it looks pretty interesting and I think it's something I could prefer to use over the AccountManager.getAuthToken.</p> <h2>Major differences</h2> <p><strong><a href="http://developer.android.com/reference/android/accounts/AccountManager.html#getAuthToken%28android.accounts.Account,%20java.lang.String,%20android.os.Bundle,%20android.app.Activity,%20android.accounts.AccountManagerCallback%3Candroid.os.Bundle%3E,%20android.os.Handler%29" rel="nofollow noreferrer">AccountManager.getAuthToken</a></strong></p> <p><strong>Pro:</strong></p> <ul> <li>Can be used for all Android 2.0 devices and newer.</li> <li>Is built in to Android and doesn't require any separate SDK.</li> <li>Can be used for all types of accounts that has an authenticator, not only Google.</li> </ul> <p><strong>Con:</strong></p> <ul> <li>Returns a token that may have expired so you always have to <a href="https://stackoverflow.com/questions/1996686/authtoken-from-accountmanager-in-android-client-no-longer-working">invalidate the token</a> and request it again to make sure you have a valid token.</li> <li>Requires the permissions GET_ACCOUNTS and USE_CREDENTIALS.</li> <li>Challenge screen is not user friendly for Android 2.*</li> </ul> <p><strong><a href="http://developer.android.com/reference/com/google/android/gms/auth/GoogleAuthUtil.html#getToken%28android.content.Context,%20java.lang.String,%20java.lang.String%29" rel="nofollow noreferrer">GoogleAuthUtil.getToken</a></strong></p> <p><strong>Pro:</strong></p> <ul> <li>Always returns a <a href="http://developer.android.com/reference/com/google/android/gms/auth/GoogleAuthUtil.html#getToken%28android.content.Context,%20java.lang.String,%20java.lang.String%29" rel="nofollow noreferrer">valid token</a>.</li> <li>Only <a href="http://developer.android.com/google/play-services/auth.html#choose" rel="nofollow noreferrer">requires</a> the permission GET_ACCOUNTS</li> <li>User friendly challenge screen.</li> <li><a href="https://stackoverflow.com/questions/14365219/in-a-nutshell-whats-the-difference-from-using-oauth2-request-getauthtoken-and-g#comment20015992_14374577">Recommended by Google</a></li> </ul> <p><strong>Con:</strong></p> <ul> <li>Require Android 2.2 and that the device have Google Play</li> <li>Require that you download and include the <a href="http://developer.android.com/google/play-services/setup.html" rel="nofollow noreferrer">Google Play services SDK</a> in your app.</li> <li>You need to <a href="http://android-developers.blogspot.se/2013/01/verifying-back-end-calls-from-android.html" rel="nofollow noreferrer">register your app</a> in the Google API Console</li> <li>Can "only" be used for Google services that uses OAuth 2.0</li> </ul> <h2>Challenge screen comparison</h2> <p><a href="http://developer.android.com/reference/android/accounts/AccountManager.html#getAuthToken%28android.accounts.Account,%20java.lang.String,%20android.os.Bundle,%20android.app.Activity,%20android.accounts.AccountManagerCallback%3Candroid.os.Bundle%3E,%20android.os.Handler%29" rel="nofollow noreferrer">AccountManager.getAuthToken</a> Challenge screen on Gingerbread and Ice Cream Sandwich</p> <p><img src="https://i.stack.imgur.com/8n7OY.png" alt="getAuthToken challenge screen for Gingerbread"> <img src="https://i.stack.imgur.com/LWM5q.jpg" alt="getAuthToken challenge screen for Ice cream sandwich"></p> <p><a href="http://developer.android.com/reference/com/google/android/gms/auth/GoogleAuthUtil.html#getToken%28android.content.Context,%20java.lang.String,%20java.lang.String%29" rel="nofollow noreferrer">GoogleAuthUtil.getToken</a> Challenge screen</p> <p><img src="https://i.stack.imgur.com/IEwcW.png" alt="getToken challenge screen"> <img src="https://i.stack.imgur.com/WTX4V.png" alt="getToken challenge screen, more details"></p> <h2>Summary</h2> <p>Since the GoogleAuthUtil approach has a much user friendlier challenge screen and requires less permissions at install time I would definitely use this approach instead of the AccountManager.getAuthToken approach whenever I can. Since you always get a valid token and don't have to hassle with invalidating the token it should make the code simpler as well.</p>
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    1. POIn a nutshell what's the difference from using OAuth2 request getAuthToken and getToken
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    1. COIm only reading about GoogleAuthUtil.getToken will try a sample now, nice summery you did that sums up my findings and the invalidating and random exceptions thrown by the AccountManager is terrible. I think the OAuth 2.0 support for AccountManager.getAuthToken was "experimental" and this is the real deal maybe,
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    2. COTackar så mycket, hoppas några fler slänger in sina 5-cent i denna diskussion. Check this out by [Tim Bray](http://android-developers.blogspot.se/2013/01/verifying-back-end-calls-from-android.html)
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    3. COadded picture. [another fighter](http://stackoverflow.com/questions/13462952/google-drive-sdk-exception)
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