Quality in cross-development

"How much of the code can be reused throughout the project?"

Reusability is one of the key quality identifiers in cross-platform development projects. Xamarin, especially with the release of Xamarin.Forms, has provided developers with extensive resources to create platform-agnostic components that can decrease redundancy and reduce developer hours in complex projects. Code quality matrices generated by Visual Studio and unit test coverage results can convert this descriptor into a quantifiable measure.

"How much do the shared components know about the platform?"

It is almost unavoidable not to include platform-specific bits in cross-platform solutions. The level that these modules are abstracted to increases the robustness of the shared components and is closely related to how loosely the implemented logic is coupled with the underlying platform. In this way, the shared components can be tested easily with mock or fake libraries without having to create platform-specific test harnesses. Unit test code coverage results help determine the testability of the application.

"How easy is it to transpose the project into another platform?"

On top of the platform-specific abstracted implementation, an autonomous shared implementation layer creates flexible solutions which can easily be adapted to other platforms. Reducing the dependencies of the shared logic to the underlying platform not only inherently increases the reusability but also the agility of the development projects. The number of conditional compilation blocks or if or else loops for the underlying platform on shared projects identifies the amount of code executed according to the platform.

"How much does your application blend into the platform?"

Even though the ultimate goal while developing with Xamarin is to create an application that can be easily compiled onto multiple targets, the applications created with Xamarin should look, feel and behave as if they were designed for that specific platform. The UI paradigms and user interaction mechanisms of each platform should be respected while creating a common foundation. Nativity is more of a nominal and subjective measure when compared to the aforementioned code descriptors.