Public View GetView (int position, View Convertview, final viewgroup parent) three parameters meaning

Recently saw someone asked the meaning of these three parameters, in fact, help has been very detailed introduction of these three parameters, it seems to be good to learn English, or even explain can not understand.

 /**
* Get A View that displays the data on the specified position in the data set. You can either
* Create a View manually or inflate it from an XML layout file. When the View is inflated, the
* Parent View (GridView, ListView ...) would apply default layout parameters unless you use
* {@link android.view.layoutinflater#inflate (int, Android.view.ViewGroup, Boolean)}
* To specify a root view and to prevent attachment to the root.
     * 
* @param position the position of the item within the adapter ' s data set of the item whose view
* we want.
* @param convertview The old view to reuse, if possible. Note:you should check that the This view
* is non-null and of an appropriate type before using. If It isn't possible to convert
* This method can create a new view of the correct data, which is view to display.
* @param parent The parent that this view would eventually be attached to
* @return A View corresponding to the data at the specified position.
     */

Public View GetView (int position, View Convertview, final viewgroup parent) three parameters meaning