draw original image size using android

Question

i am writing pgm for zoom in and zoom out in imageview and i set canvas bound in some range so image was big,i want to display actual image size in canvas for zoom this my code..

protected void onDraw(Canvas canvas)
{
    super.onDraw(canvas);

    //this line i want to edit code for get original image size
    image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler);
    image.draw(canvas);
}