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How can I change camera button functionally and use it (or any other physical button) to pause/resume mp3 in a media player app? It is very important for my, because I want be able to pause/resume mp3 without looking to screen of the phone.
Actually my phone (Xperia Mini Pro) has a hardware keyboard with 42 keys, but a few apps use this button as a keyboard shortcut (X-plore is one of few programs that uses hardware keyboard properly).
You have multiple choices on how to accomplish this:
If you've got a 1-button-headset connected, you can facilitate that button. There are multiple apps on the playstore providing enhanced possibilities to this -- just search for "headset-control. Having a Philips headset, I use Philips Headset, which works pretty well; you might have to try several of the available choices to find the one suiting you best.
Most of these apps offer things like:
Actions are usually configurable.
Re-defining a hardware button can be achieved e.g. using Tasker, which is an automation app for Android (to be more precise: it's the most complete automation app available; costs ~ 5 Euro, a 7-day-trial is available at the homepage, but it's worth every cent). The Tasker manual states:
Simulate Media Button: when selected, any media player which listens for Media Button events can be controlled. Without it, the only the Android system media player will respond.
Note: the Toggle Pause function may not work unless playback has already been started manually.
And yes: You can bind that action to...
amongst others. You could even bind it to a "shake pattern" (e.g. shake left-right to skip a title).
