Progress load for list view on scroll

EndlessScrollListener.java

package com.naughtystick.utils;

import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;

/**
 * Created by dirong on 26.06.13.
 */
public abstract class EndlessScrollListener implements AbsListView.OnScrollListener, AbsListView.OnItemSelectedListener {

    private final AbsListView baseView;
    private boolean active = true;
    private int visibleThreshold;

    protected EndlessScrollListener(AbsListView view, int visibleThreshold) {
        this.visibleThreshold = visibleThreshold;
        this.baseView = view;
        view.setOnScrollListener(this);
        view.setOnItemSelectedListener(this);
    }

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        if (scrollState == SCROLL_STATE_IDLE) {
            if (view.getLastVisiblePosition() >= view.getCount() - visibleThreshold
                    && active) {
                onListEnded();
            }
        }
    }

    public boolean isActive() {
        return active;
    }

    public void setActive(boolean active) {
        this.active = active;
    }

    abstract public void onListEnded();

    @Override
    public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
    }

    public int getVisibleThreshold() {
        return visibleThreshold;
    }

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        if (position >= baseView.getCount() - visibleThreshold && active) {
            onListEnded();
        }
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
}