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I need to search through text files (around 40MB) in my app with regular expressions, as you can imagine, it normally takes 1 minute or so to get it done. AND I have to do it repeatedly.
I wonder if I can keep these files in RAM after the first search. Can I possibly do that? I mean, find a way to explicitly say keep something in RAM for some time.
Keep the results in a custom object that will save the search result. This will keep it in RAM (as long as you keep a reference to it).
Also keep in mind that allocating 40 MiB in RAM in Android devices is not a very good idea since RAM is quite limited in a lot of low-end devices. This can make your application a very tasty target for Android when it looks to free memory.