Audio recorder application doesn't record - angularjs

Question

I've this code that work in genymotion enviroment. I need to record audio, so this is my code:
controllers.js
.controller('PlaylistsCtrl', function($scope, $cordovaMedia, $ionicPlatform) {
function __log(e, data) {
log.innerHTML += "\n" + e + " " + (data || '');
}
var recorder = null;
$scope.onSuccess = function() {
console.log('Media success');
}
$scope.onError = function(e) {
console.log('Media error', e);
}
$scope.onStatus = function(type) {
console.log('Media status', type);
}
$scope.startRecording = function () {
if (recorder == null) {
console.log('init recorder');
recorder = new Media('record.mp3', $scope.onSuccess, $scope.onError, $scope.onStatus);
}
recorder.startRecord();
recordBtn.disabled = true;
stopBtn.disabled = false;
__log('startRecording');
}
$scope.stopRecording = function() {
recorder.stopRecord();
__log('stopRecording');
}
$scope.playRecording = function() {
recorder.play();
__log('playRecording');
__log( JSON.stringify(recorder) )
console.log( JSON.stringify(recorder) );
}
record.html
<button id='recordBtn' ng-click='startRecording()'>record</button>
<button id='stopBtn' ng-click='stopRecording()'>stop</button>
<button id='playBtn' ng-click='playRecording()'>play</button>
<h2>Log</h2>
<pre id="log"></pre>
My problem is when i run my app in ionic viewer, and i click to #recordBtn, , nothing happens, startRecording() not work. Thank you !