Camera Switching and camera support checking - Appcelerator Titanium

app.js

Titanium.UI.setBackgroundColor('#000');

var win1 = Titanium.UI.createWindow({  
    title:'Tab 1',
    backgroundColor:'#fff'
});

var aButton = Ti.UI.createButton({
	title : 'Camera',
	height : 50,
	width : 100,
	top : 50,
	left : 50
});

aButton.addEventListener('click', function() {
	if (Ti.Media.isCameraSupported) {  //Ti.Media.isCameraSupported is used to check if the Camera is available and then you can use built in facility for switching between cameras.
        Titanium.Media.showCamera({
            success : function(event) {
                // called when media returned from the camera
                Ti.API.debug('Our type was: ' + event.mediaType);
                if (event.mediaType == Ti.Media.MEDIA_TYPE_PHOTO) {
                    var imageView = Ti.UI.createImageView({
                        width : win.width,
                        height : win.height,
                        image : event.media
                    });
                    win.add(imageView);
                } else {
                    alert("got the wrong type back =" + event.mediaType);
                }
            },
            cancel : function() {
                // called when user cancels taking a picture
            },
            error : function(error) {
                // called when there's an error
                var a = Titanium.UI.createAlertDialog({
                    title : 'Camera'
                });
                if (error.code == Titanium.Media.NO_CAMERA) {
                    a.setMessage('Please run this test on device');
                } else {
                    a.setMessage('Unexpected error: ' + error.code);
                }
                a.show();
            },
            saveToPhotoGallery : true,
            allowEditing : true,
            mediaTypes : [Ti.Media.MEDIA_TYPE_VIDEO, Ti.Media.MEDIA_TYPE_PHOTO],
            showControls : true  // always use to get the basic facility about camera.
            //overlay:overlayview  // do not use overlay to when you want to use the switching facility
        });
}
});

win1.add(aButton);
win1.open();