Previously, my installed application (desktop application) is using gdata-java-client with ClientLogin mechanism, for user to access Google service.
In order to provide seamless experience, the desktop application will store users previous entered username and password in encryption format. Whenever they wish to access Google service, the desktop application will automatically help users to fill in username + password information. (Even after application restarting) Users just need to single button click to access Google service.
The login code is as follow : http://jstock.hg.sourceforge.net/hgweb/jstock/jstock/file/808b03e824bf/src/org/yccheok/jstock/gui/Utils.java#l1520
I plan to migrate code to google-api-java-client, and use OAuth 2.0. Since my desktop application has no control over users entered username and password, users will be prompted with the following Windows every time they wish to use Google service.
The user flow doesn’t seem seamless any-more, as users need to deal with the browser window, every-time after application restarting. Is there any way for my desktop application, to remember their login information, so that they need not to respond to browser window every-time the application restarting?
Great question. Yes, we are working on this right now. The feature request is here, and the changeset under review is here. Our plan is to make it be available in the next version 1.11.0-beta some time in July. For now, feel free to patch in FileCredentialStore from the changeset into your application and try it out. More documentation about the OAuth 2.0 support in the Java client library can be found here (which will be updated for 1.11.0-beta with information about FileCredentialStore).