XListView的简单使用

public class MainActivity extends AppCompatActivity {

String baseUrl = "http://api.expoon.com/AppNews/getNewsList/type/1/p/";
XListView xListView;
List<GsonData.DataBean>list = new ArrayList<GsonData.DataBean>();
private MAdapter mAdapter;
private int page;
private ImageLoader instance;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //获取控件
    xListView = findViewById(R.id.xlv);
    //使用imageLoader
    instance = ImageLoader.getInstance();

    //适配器
    mAdapter = new MAdapter();
    xListView.setAdapter(mAdapter);

    //添加数据
    initData(0);

    //支持加载更多数据
    xListView.setPullLoadEnable(true);

    //xListView监听事件
    xListView.setXListViewListener(new XListView.IXListViewListener() {
        @Override
        public void onRefresh() {//下拉刷新
            list.clear();//清除之前的数据
            initData(0);//加载新数据
        }

        @Override
        public void onLoadMore() {//上拉刷新
            page++;
            initData(page);
        }
    });

}
}

//联网加载数据

private void initData(int page) {
    String urlData = baseUrl+page;
    
    //使用异步获取数据
    new MAsyncTask().execute(urlData);
}

//异步

private class MAsyncTask extends AsyncTask<String,Void,String> {
    @Override
    protected String doInBackground(String... strings) {
    
        return NetData.getNetjson(strings[0]);//请求接口数据
    }
    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);

        Gson gson = new Gson();

        GsonData gsonData = gson.fromJson(s, GsonData.class);

        List<GsonData.DataBean> data = gsonData.getData();

        //将所有的集合添加到大集合中
        list.addAll(data);

        //适配器刷新数据
        mAdapter.notifyDataSetChanged();;

        //隐藏刷新头和刷新底部
       Complete();
    }
}


//隐藏刷新头和刷新底部
private void Complete() {
    //刷新时出现的字
    xListView.setRefreshTime("刚刚刷新，还没有新数据");
    xListView.stopLoadMore();//底部消失
    xListView.stopRefresh();//头部消失
}

//适配器

 private class MAdapter extends BaseAdapter {

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder=null;
        if (convertView == null) {
        
            holder = new ViewHolder();
            convertView = getLayoutInflater().inflate(R.layout.lv_item,null);
            holder.imageView = convertView.findViewById(R.id.imageView);
            holder.textView = convertView.findViewById(R.id.textView);
            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.textView.setText(list.get(position).getNews_title());
		//imageLoader加载图片
        instance.displayImage(list.get(position).getPic_url(),holder.imageView);
        return convertView;
    }
}
class ViewHolder{
    ImageView imageView;
    TextView textView;
}