"Android Notes" Arrayadapter Delete Item considerations

Arrayadapter provides the Remove method to delete data from the data source and to refresh the interface. Here is its source code:

public void Remove (T object) {        synchronized (mLock) {            if (moriginalvalues! = null) {                Moriginalvalues.remove ( object);            } else {                Mobjects.remove (object);            }        }        if (Mnotifyonchange) notifydatasetchanged ();//Notify Observer    }

Here is an example of arrayadapter use:

Mlistview = (ListView) Findviewbyid (r.id.lv); string[] data = {"Aaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbb", "aaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbb", " Aaaaaaaaaaaaaaaaaa "," bbbbbbbbbbbbbbbb "," aaaaaaaaaaaaaaaaaa "," bbbbbbbbbbbbbbbb ",};final List<String> d = new Arraylist<string> (arrays.aslist (data)) Madapter = new Arrayadapter<string> (this, R.layout.item, R.id.tv , d); Mlistview.setadapter (Madapter); Mlistview.setonitemclicklistener (new Onitemclicklistener () {@Overridepublic void Onitemclick (int postion) {madapter.remove (Madapter.getitem (postion));}});

There is no problem with the above code, you can delete entries. But when we construct the Arrayadapter, we pass in the If the data source is not a list type but an array type, then the deletion will be an error！
Reason:To view the Arrayadapter constructor:

Public Arrayadapter (context context, int resource, int textviewresourceid, t[] objects) {        init (context, resource, Tex Tviewresourceid, Arrays.aslist (objects));}

As you can see, it calls the Arrays.aslist method to convert the array to the list type, but we know that the list cannot be add/remove, so the Arrayadapter remove method will give an error. So, when you construct Arrayadapter, it's best to pass in a list collection (modifiable), or you can:

List<string> d = new arraylist<string> (arrays.aslist (data));

"Android Notes" Arrayadapter Delete Item considerations