Question

How do I go about getting my app to play an mp3 (in my res) on startup? Or how how about if I wanted this to happen when a button is clicked?

Answer 1

From the Audio and Video section of the Dev Guide:

Perhaps the most common thing to want
to do is play back media (notably
sound) within your own applications.
Doing this is easy:

1. Put the sound (or other media resource) file into the res/raw folder of your project,
   where the Eclipse plugin (or aapt) will find it and make it into a resource that can be
   referenced from your R class

2. Create an instance of MediaPlayer, referencing that resource using MediaPlayer.create, > and then call start() on the instance:

MediaPlayer mp = MediaPlayer.create(context, R.raw.sound_file_1);
mp.start();

To stop playback, call stop(). If you
wish to later replay the media, then
you must reset() and prepare() the
MediaPlayer object before calling
start() again. (create() calls
prepare() the first time.)

To pause playback, call pause().
Resume playback from where you paused
with start().

So put the above code example in the onCreate() or onStart() of your launcher activity to have it play on startup, and place it in a button’s onClick() method to respond to a button press.