Xmodulo posted a tutorial about developing cross-platform mobile apps on Linux

The last few years have witnessed dramatic growth of the mobile market, mostly driven by a large selection of applications. As consumers, we all hate to see some kind of market monopoly by any one platform. The more competition, the more innovation. As developers, we have mixed feelings about cross-platform development. Cross-platform development has several cons; poor platform integration, inflexible design, etc. On the other hand, we can reach a wider market with more consumers, and can offer uniform look and feel for our app across various platforms.

Today, almost all modern mobile platforms provide object-oriented APIs. Thus there is no reason not to build multi-platform apps. In this tutorial, we will walk you through the basics of cross-platform development.

  How to develop cross-platform mobile apps on Linux