Almost two thirds are likely to drop it by the 10th use! Some will abandon the app due to poor navigation and usability; some will find a better app with superior UI design. What do you do now — shelve your app and start from scratch?

Or, perhaps it is time to reinvent it? A good app versioning strategy helps ensure the relevance of your app and keep your users engaged and generating revenue. But if you have implemented all of your ideas in the first version of your app, or did not anticipate the future dynamics because of budget or other constraints, you may find yourself trapped. In the custom development world, app versioning can be tricky. How can you plan ahead to ensure your app stays relevant and appealing to your users, while your long-term costs are kept to the minimum?

A great advantage of repeated, solid app releases is that if you have had bad reviews, you have a chance to fix that. App versioning helps you make major changes, if necessary, because you have not spent all your money, nor wasted all of your good ideas. MobileSmith offers no templates, but a truly custom app experience created native for iPhone, Android, and iPad. You can version and deliver your apps securely in the cloud environment. With this approach, when the market places new demands on your mobile strategy, you need not go through a budgeting cycle, write requirements, get quotes… Simply go back to your desk, open the platform, create a new draft, instantly prototype it and send over-the-air to your device; test it live, and launch it to market.

Want a live demo? Sign up here! Mobile App Development. App Versioning Why do you need app versioning? Because of the strict rules of source and binary compatibility, these checks can be simpler and more complicated depending on what is needed. An application that desires, at compile-time, to decide on whether and how to use a particular library feature needs to only check two values: the major and the minor version.

Since, by definition, there are no API changes across patch versions, that symbol can be safely ignored. Note that any kind of a check for a minimum version will then pin that application to at least that version. The application's installation mechanism should then ensure that that minimal version has been installed for example, using RPM dependency checks. If the feature changes across minor versions are source compatible, but are say simply different choices of values to pass into the library, then an application can support a wider variety of installed libraries if it avoids compile-time checks.

A library meeting this specification should support a way for an application to determine the library's version at run-time. Run-time checks are preferable in all cases. This type of check enables an application to run against a wider variety of minor releases of a library the application is " less coupled " to a particular library release.

Of course, if an application requires a function that was introduced in a later, minor release, then the application will require that, at least, that release is installed on the target system. Run-time checks are particurly important if the application is trying to determine if the library has a particular bug that may need to be worked around, but has been fixed in a later release. If the bug is fixed in a patch release, then the only avenue for an application is to perform a runtime check.

This is because an application cannot require a specific patch level of the library to be installed -- those libraries are perfectly forward and backwards compatible, and the administrator is free to choose any patch release, knowing that all applications will continue to function properly. If the bug was fixed in a minor release, then it is possible to use a compile-time check, but that would create a tighter coupling to the library.

Parallel installation refers to the ability to install multiple versions of a library simultaneously -- they exist in parallel. This document will not discuss the full rationale for why this is important, but will instead detail how this versioning specification maps onto those concepts. Please refer to Havoc Pennington's "Parallel Installation" essay for futher details and the rationale behind this form of parallel installation.

This strategy allows an application to explicitly state which version of the library that it wants to link against. Since both libraries can reside on the system at the same time, both applications' needs can be satisfied. Typically, shared libraries on Unix-ish platforms will set up symlinks from the. For example:.

Key steps to a great app versioning strategy:

In this configuration, applications will be bound to the. The minor version does not come into play here because we want applications to dynamically load and link to the new library when a new minor version is installed.

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The implication here is that build systems for libraries should arrange to generate. The default installation directory for a library's include files should specify the MAJOR version number, and should normally be installed as a subdirectory in some standard location. Depending upon the API that the application is designed to work against, it can simply include different versions of the include directory.

Or non-code types of files e. It is expected that other libraries, besides those in the APR project, will want to use the above definitions of versioning. This is quite fine, and those libraries can simply reference this document. Its canonical location is:. APR's Version Numbering. The Basics.

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Source Compatibility. Binary Compatibility. Yes Compatibility across patch versions is guaranteed. Yes Compatibility with later minor versions is guaranteed.

Version Management

No Compatibility with prior minor versions is not guaranteed. No Compatibility with different major versions is not guaranteed. This section details how we will build the code to meet the above requirements and guidelines. Patch Version. Minor Versions. New functions An application coded against an older minor release will still have all of its functions available with their original signatures.

New constants Similar to functions, all of the original old constants will be available to an application. An application can then choose to use new constants to pick up new semantics and features. Replacing functions This gets a bit trickier.



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The original function must remain available at the link-level so that an application compiled against a minor version will continue to work with later minor versions. Further, if an application is designed to work with an earlier minor version, then we don't want to suddenly change the requirements for that application. This means that the headers cannot silently map an old function into a newer function, as that would turn an application, say, based on 1. Deprecating functions Since a function must remain available for applications coded against a previous minor release, it is only possible to " deprecate " a function.

It cannot be removed from the headers so that source compatibility is retained and it cannot be removed from the library so that binary compatibility is retained. Note that all deprecated functions will be removed at the next major version bump.