// Java
public class MyAdapter extends RecyclerView.Adapter<RecyclerAdapter.ListViewHolder> {

    private ArrayList<MyRepo> myRepoList;

    public RecyclerAdapter(ArrayList<MyRepo> myRepoList) {
        this.myRepoList = myRepoList;
    }

    // ....

    public void setFilter(List<MyRepo> list) {
        myRepoList = new ArrayList<>();
        myRepoList.addAll(list);
        notifyDataSetChanged();
    }
}

// Kotlin
class MyAdapter (private var myRepoList: ArrayList<MyRepo>) : RecyclerView.Adapter<RecyclerAdapter.ListViewHolder>() {

// ....

    fun setFilter(list: List<MyRepo>) {
        myRepoList = ArrayList<MyRepo>()
        myRepoList.addAll(list!!)
        notifyDataSetChanged()
    }
}