public class LoadListView extends ListView implements AbsListView.OnScrollListener{
  private LayoutInflater mInflater;
  //判断是否滚动最后一行
  private boolean isLastRow = false;
  //底部View布局
  private View mFooter;
  //实现接口加载更多数据
  public OnLoadMoreListener moreListener;

  public void setLoadMoreListener(OnLoadMoreListener moreListener){
    this.moreListener = moreListener;
  }
  public LoadListView(Context context) {
    super(context);
    initView();
  }

  public LoadListView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initView();
  }

  public LoadListView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initView();
  }
  private void initView(){
    mInflater = LayoutInflater.from(getContext());
    mFooter = mInflater.inflate(R.layout.
    listview_footer,null);
    this.addFooterView(mFooter);
    mFooter.setVisibility(View.GONE);
    setOnScrollListener(this);
  }

  @Override
  public void onScrollStateChanged(AbsListView absListView, int scrollState) {
    //正在滚动时回调，回调2-3次，手指没抛则回调2次。scrollState = 2的这次不回调
    //回调顺序如下
    //第1次：scrollState = SCROLL_STATE_TOUCH_SCROLL(1) 正在滚动
    //第2次：scrollState = SCROLL_STATE_FLING(2) 手指做了抛的动作（手指离开屏幕前，用力滑了一下）
    //第3次：scrollState = SCROLL_STATE_IDLE(0) 停止滚动
    //当屏幕停止滚动时为0；当屏幕滚动且用户使用的触碰或手指还在屏幕上时为1；
    //由于用户的操作，屏幕产生惯性滑动时为2

    //当滚到最后一行且停止滚动时，执行加载 
    if(isLastRow&&scrollState== OnScrollListener.SCROLL_STATE_IDLE){
      mFooter.setVisibility(View.VISIBLE);
      isLastRow = false;
      if(moreListener!=null){
        moreListener.loadMore();
      }
    }
  }

  @Override
  public void onScroll(AbsListView absListView, int firstVisibleItem,
             int visibleItemCount, int totalItemCount) {
    //滚动时一直回调，直到停止滚动时才停止回调。单击时回调一次。
    //firstVisibleItem：当前能看见的第一个列表项ID（从0开始）
    //visibleItemCount：当前能看见的列表项个数（小半个也算）
    //totalItemCount：列表项共数
    //判断是否滚到最后一行
    if (firstVisibleItem + visibleItemCount == totalItemCount && totalItemCount > 0) {
      isLastRow = true;
    }
  }
  public interface OnLoadMoreListener{
    void loadMore();
  }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical">
  <ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_toLeftOf="@+id/id_loadmore"
    android:layout_marginRight="5dp" />
  <TextView
    android:id="@+id/id_loadmore"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="加载更多"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"/>
</RelativeLayout>

public class MainActivity extends Activity implements LoadListView.OnLoadMoreListener {
  private List<News> list = new ArrayList<>() ;
  private loadAdapter mAdapter;
  private LoadListView mListView;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    loadMoreData();
    mListView =(LoadListView) findViewById(R.id.id_list_view);
    mAdapter = new loadAdapter(this,list);
    mListView.setAdapter(mAdapter);
    mListView.setLoadMoreListener(this);
  }
  private void loadMoreData(){
    for(int i = 0 ; i <10;i++){
      News news = new News();
      news.setTitle("许巍");
      news.setContent("蓝莲花");
      list.add(news);
    }
  }

  @Override
  public void loadMore() {
    new Handler().postDelayed(new Runnable() {
      @Override
      public void run() {
        loadMoreData();
        showLoadMore();
      }
    },2000);

  }
  private void showLoadMore(){
    mAdapter.notifyDataSetChanged();
  }
}

public class loadAdapter extends BaseAdapter {
  private List<News> list;
  private Context mContext;
  public loadAdapter(Context context,List<News> list){
    this.list = list;
    this.mContext = context;
  }

  @Override
  public int getCount() {
    return list.size();
  }

  @Override
  public Object getItem(int position) {
    return position;
  }

  @Override
  public long getItemId(int position) {
    return position;
  }

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;
    if(convertView==null){
      viewHolder = new ViewHolder();
      convertView = LayoutInflater.from(mContext).inflate(R.layout.item_news,null);
      viewHolder.title = (TextView) convertView.findViewById(R.id.id_title);
      viewHolder.content = (TextView)convertView.findViewById(R.id.id_content);
      convertView.setTag(viewHolder);
    }else {
      viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.title.setText(list.get(position).getTitle());
    viewHolder.content.setText(list.get(position).getContent());
    return convertView;
  }

  public class ViewHolder{
    private TextView title;
    private TextView content;
  }

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <view.LoadListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/id_list_view"
    />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical">
<TextView
  android:id="@+id/id_title"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:text=""
  android:gravity="center"
  android:padding="5dp"/>
  <TextView
    android:id="@+id/id_content"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text=""
    android:gravity="center"
    android:padding="5dp"/>
</LinearLayout>