The issue is not with how you're generating the map, it's with your camera. Create a camera using one of AndEngine's various camera classes. (I'm a fan of the SmoothCamera.) Like this:
SmoothCamera camera = new SmoothCamera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT, 10, 10, 1.0f);
CAMERA_WIDTH and CAMERA_HEIGHT are ints for you to define. If you set these to smaller values, you'll be more zoomed in. You can also directly adjust the zoom on the camera. Like this:
camera.setZoomFactor(5.0f);
And you're probably going to want to set the camera to chase your player entity. Something like this:
camera.setChaseEntity(pChaseEntity)
Where pChaseEntity is whatever you'd like it to follow. Hope this helps.