If you’ve only recently made the transition from hardware or capacitive navigational buttons to on-screen buttons like I have, you may have found the virtual buttons to be quite obstructive and intrusive, for a lack of better words. If you own either the Sony Xperia Z, T, TX, or V; there is now a guide that allows you to not only make the on-screen buttons transparent, but also the status bar if you wish.
Written by XDA Forum Member Spaun_Studio, the guide is relatively simple and straightforward, detailing the required process for transparent virtual buttons and status bar with clear and direct steps. Users must decompile the android.policy.jar and SystemUI.apk file with a tool such as APKtool. From there, users edit, remove, and add a couple of lines in various .xml and .smali files, and recompile them once completed. Each step is accompanied visually with examples of code, with a convenient color coding system to aid users with finding the specific codes that require editing.
We always love guides that teach users how to mod their phones themselves—not only because they encourage users to learn, but also because of the unrestricted flexibility they enable. In this case, users can freely change a couple lines of code to have whatever degree of transparency they fancy.
Of course, following the instructions I have only briefly outlined would would most certainly result in an unwelcome outcome (although you’re more than welcome to try), so it’s best for you to visit the guide for a successful modification.