I m new in Marmalade Juice and I follow the very first tutorial about, How to convert an iOS application to an Android application.
I have some apps on AppStore and all of them uses CocoaPods which we all know, wrap the project with workspace.
How can I convert .cxworkspace with Marmalade Juice?
As of the current release (in Marmalade SDK 7.3.1 at time of writing), Juice only supports conversion of individual Xcode projects, not workspaces.
You could try converting each project in your workspace independently to create a Marmalade MKB project for each, then modify each of these into a Marmalade subproject and create a master "workspace" Marmalade project that includes each subproject. Then use the Marmalade MKB tool to generate a single Xcode project for your Juice build that includes everything in your workspace.
This isn't something I've tried, so I suspect it will take a bit of doing and research into the Marmalade MKB system to determine how to achieve it.
A good place to look for and ask Marmalade Juice questions is here - https://answers.madewithmarmalade.com/questions/topics/juice.html - more direct than Stack Overflow.
Information on the Marmalade project files and tool is here: http://docs.madewithmarmalade.com/display/MD/Marmalade+project+files