Android. Obtaining image size from it's resource id

This is a part of my Activity:

private ImageView mImageView;
private int resource;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  resource = getIntent().getIntExtra("res", -1);

  Matrix initMatrix = new Matrix();

  mImageView = new ImageView(getApplicationContext());
  mImageView.setScaleType( ImageView.ScaleType.MATRIX );
  mImageView.setImageMatrix( initMatrix );
  mImageView.setBackgroundColor(0);
  mImageView.setImageResource(resource);
}

I try to display an image within an ImageView using a matrix as scale type (I want to add multitouch later). But before user starts interaction i want the image to be centered and fit inside the ImageView. I already found answers concerning how to solve it but there is one problem for me: to make image centered using matrix I need to know its width and height. Is there any way of getting image size when all you have is int resource ?