Authenticate with Google account on Android. Get Access Token valid for User Info Rest service : https://www.googleapis.com/oauth2/v1/userinfo

AuthWithGoogle

private String updateToken(boolean invalidateToken) {
        String authToken = "null";
        try {
            AccountManager am = AccountManager.get(getApplicationContext());
            Account[] accounts = am.getAccountsByType("com.google");
            AccountManagerFuture<Bundle> accountManagerFuture;
            if (this == null) {//this is used when calling from an interval thread
                accountManagerFuture = am.getAuthToken(accounts[0], "oauth2:https://www.googleapis.com/auth/userinfo.profile" , false, null, null);
            } else {
                accountManagerFuture = am.getAuthToken(accounts[0], "oauth2:https://www.googleapis.com/auth/userinfo.profile" , null, this, null, null);
            }
            Bundle authTokenBundle = accountManagerFuture.getResult();
            authToken = authTokenBundle.getString(AccountManager.KEY_AUTHTOKEN).toString();
            if (invalidateToken) {
                am.invalidateAuthToken("com.google", authToken);
                authToken = updateToken(false);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return authToken;
    }

Manifest

<uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.USE_CREDENTIALS" />
<uses-permission android:name="android.permission.INTERNET" />