About the GetView function in Arrayadapter

I wanted to use the GetView in Arrayadapter to get the View object for each item in the ListView. As a result, no matter how I make changes to the View object, it doesn't have an effect. Will not change is taken for granted, because GetView, in fact, is "CreateView". Here is the source code I refer to:

 public view getview (int position, view convertview, viewgroup parent)  {        return createviewfromresource (position,  Convertview, parent, mresource);     }    private view  createviewfromresource (int position, view convertview, viewgroup parent,             int resource)  {         View view;        TextView  text;        if  (convertview == null)  {             view = minflater.inflate (Resource,  parent, false);        } else {             view = convertview;        }         try {             if  (mfieldid == 0)  {                 //  if no custom field is  assigned, assume the whole resource is a TextView                 text =  (TextView)  view;            } else {                 //   otherwise, find the textview field within the layout                 text =  (TextView)  view.findviewbyid (mfieldid);             }        }  catch  (classcastexception e)  {             LOG.E ("Arrayadapter",  "you must supply a resource id for  a textview ");             throw new  illegalstateexception (                      "Arrayadapter requires the resource id to  be a textview ",  e);        }         t item = getitem (position);         if  (item Instanceof charsequence)  {             Text.settext ((charsequence) Item);        } else {             text.settext (Item.toString ());         }        return view;     }

Judging from the code, it must not be what I think. If Convertview equals null, each call to GetView returns a new object. But, why?

My understanding is that adapter, as controller, gets the data down from the model layer and supplies the object up to the view layer. As a giver, you should not be aware of the view layer information. Therefore, it is undesirable to obtain the object of the view layer by adapter.

About the GetView function in Arrayadapter