Question

So I found some code that I am trying to get working. I am new to Android/Exclipse/Java and still trying to wrap my head around the whole thing. However, I am starring myself blind.

Say I have this:

private class RSSListAdapter extends ArrayAdapter<MyRSSItem> {
  private List<MyRSSItem> objects = null;        
  public RSSListAdapter(Context context, int viewid, List<MyRSSItem> objects) {
    super(context, viewid, objects);                       
    this.objects = objects;            
  }
}

and then elsewhere this:

myRssAdapter = new RSSListAdapter(thisActivityContext, newsListView, myItemsDataArrayList);

where myItemsDataArrayList is declared like this:

ArrayList<MyRSSItem> myItemsDataArrayList = new ArrayList<MyRSSItem>();

I get this error:

The constructor News.RSSListAdaptor(Context, ListView, ArrayList) is undefined

Of course I have tried Google, but, well, no luck.

Answer 1

The constructor’s definition is this:

public RSSListAdapter(Context context, int viewid, List<MyRSSItem> objects) {

This means it accepts in only a Context, an int, and a List <MyRSSItem>

However, you call the constructor with these arguments:

new RSSListAdapter(thisActivityContext, newsListView, myItemsDataArrayList);

the second argument is a newsListView, which isn’t an int, it is a ListView. They are not the same type, hence the compile-time error.

If you change to android.R.id.text1, it should work, since that is a valid TextView id, like the superclass constructor requires.

And definitely don’t forget to set the ListView‘s adapter to your RSSListAdapter after creating it.

For more detailed info, this tutorial is pretty helpful.