It works for me, check it out.
var filedirPath = $ionicPlatform.is('android') ? '/android_asset/www/app/audio' : 'audio';
var fileName = filedirPath + "/BlossominyourSmile.mp3";
var media = new Media(self.fileName, function(){
console.log("Silence played succssfully");
}, function(err){
});
media.play({playAudioWhenScreenIsLocked : true, numberOfLoops: 0});
Media , media.pause, media.resume, media.stop
,
if(self.media){ self.media.stop(); self.media.release();}