Control of the android mp3 player

With the android device Oysters T74mr 4g through the mono bluetooth router is playing mp3 file on the bluetooth headset. We need to organize:
1) start/pause the android player by means of an external button. The button is not part of the headset and is located separately. Just a separate button. You can switch via mini USB, you can wireless. Feature: when holding the button, a pause is held, when released, playback resumes. The wireless option is preferable, in the swing buttons ideally some one-two-button bluetooth remote.
(2) the possibility of looping the reproduction of the fragment from such and such time.
Criteria for sound quality are minimal (speech, most importantly loud and legible). Which player will be taken as a basis - it does not matter. It must have an adjustable preamp (if you need to add volume even at the cost of distortion)
As I have already noted, my device is constantly using a bluetooth connection to the headset (that is, in the case of a wireless solution by bluetooth, there will be at least two connections at the same time).