I want to study the Android API on my phone during my frequent and long metro rides (where I cannot connect to the internet). What would be the best way to make the documentation available (I would appreciate being able to use a search option and an index) ? Is copying all the documentation files from my PC to my Android device the best thing to do ? Is there any serious app that could provide this features ?
There is an app that does provide that:
It's not the solution you are looking for exactly but an alternative way would be to use the code completion feature of the AIDE app, an Android IDE running on Android.
Plus you can code during your metro rides and even meetings :)
You can find a pdf version for most sections that are built monthly with details of what has changed in the previous month. The website has been split into sections for each book.
The sections are all available as a preview and as a download for free.