mList from Custom ArrayList not working...

[selimonline]

First of all thanks for this awesome library.
But honestly very complex to implement for beginners like me....
Any ways,
I have an ArrayList
private ArrayList<Videos> videos=new ArrayList<Videos>();
Videos.java

public class Videos implements ListItem {
    private String username;
    public String getUsername() { return this.username; }
    public void setUsername(String username) { this.username = username; }

ListItem functions... setACtive and others 

now when I am trying to implement

private final ListItemsVisibilityCalculator mVideoVisibilityCalculator =
            new SingleListViewItemActiveCalculator(new DefaultSingleItemCalculatorCallback(), videos);

here videos is already an ArrayList=List

It gives
Error:(85, 95) error: incompatible types: ArrayList cannot be converted to List<? extends ListItem>

Any help highly appreciated. Thanks

[derWud]

How are the parameters in the constructor of SingleListViewItemActiveCalculator defined?