访问自定义ArrayAdapter中的方法

Question

I have a ListView and a custom adapter. I want to change a variable in MyListAdapter object. This is some code from my custom list Adapter:

public class MyListAdapter extends ArrayAdapter<Something> {
    ........
    ........
    private int myPosition= -1;
    ........

    public void setMyPosition(int pos) {
        myPosition = pos;
    }
................
}

now in my Activity:

MyListAdapter<Something> listAdapter = new MyListAdapter(this,
                R.layout.list_item_transaction, accounts);

listAdapter.setMyPosition(2);

But I cannot access setMyPosition method. In Eclipse I get The method setMyPosition() is undefined for the type ArrayAdapter

Answer 1

Declare listAdapter to be of type MyListAdapter. Otherwise it doesn't exist, Java can't call a function of a subclass if it doesn't exist on the parent.

This will only work if TransListAdapter is a subclass or MyListAdapter. Otherwise the setMyPosition function won't exist there either.

Answer 2

Try this :

public class MyListAdapter<Something> extends ArrayAdapter<Something> {
    ........
    ........
    private int myPosition= -1;
    ........

    public void setMyPosition(int pos) {
        myPosition = pos;
    }
    ........
}