上拉加载 ——Listview

最新推荐文章于 2024-04-18 17:50:16 发布

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最新推荐文章于 2024-04-18 17:50:16 发布

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本文链接：https://blog.youkuaiyun.com/weixin_44660509/article/details/87913996

本文介绍了一个名为Frag_01的Fragment类，用于展示新闻列表。该Fragment通过异步任务从指定URL获取新闻数据，并使用XListView进行数据展示，支持刷新和加载更多功能。同时，它还利用了自定义的MyAdapter适配器和Bean数据模型。

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package com.example.Frag;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.example.MyAdapter.MyAdapter;
import com.example.MyBean.Bean;
import com.example.NetUlit.Netulie;
import com.example.tab_02.R;
import com.google.gson.Gson;
import com.qy.xlistview.XListView;

import java.util.ArrayList;
import java.util.List;

public class Frag_01 extends Fragment {
private String Url = “http://api.expoon.com/AppNews/getNewsList/type/1/p/”;
private List<Bean.DataBean> list = new ArrayList<Bean.DataBean>();
private XListView xListView;
private int p=1;
private MyAdapter myAdapter;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag_01, container, false);
    xListView = view.findViewById(R.id.xlistview);
    return view;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

// 开启禁止上拉或者加载
xListView.setPullLoadEnable(true);
xListView.setPullRefreshEnable(true);
// 判断网络
Netulie ulie = new Netulie();
boolean getcontent = ulie.isGetcontent(getActivity());
if (getcontent) {
myAdapter = new MyAdapter(list, getActivity());
xListView.setAdapter(myAdapter);

        goon(p);
        //        xlistview 监听
        xListView.setXListViewListener(new XListView.IXListViewListener() {
            @Override
            public void onRefresh() {

// 清空数据
list.clear();
// 刷新
goon§;
}

            @Override
            public void onLoadMore() {
                p++;
                goon(p);
        }
        });
    } else {
        Toast.makeText(getActivity(), "检查网路", Toast.LENGTH_SHORT).show();
    }

}

//运行\

private void goon(int pag) {
    String s = Url + pag;
    new Anck().execute(s);
}



public class Anck extends AsyncTask<String, Void, String> {
    @Override
    protected void onPostExecute(String s) {

        Gson gson = new Gson();
        Bean bean = gson.fromJson(s, Bean.class);
        List<Bean.DataBean> data = bean.getData();
        list.addAll(data);

        myAdapter.notifyDataSetInvalidated();

// 显示头标
xListView.setRefreshTime(“刚刚”);
xListView.stopLoadMore();
xListView.stopRefresh();
super.onPostExecute(s);
}

    @Override
    protected String doInBackground(String... strings) {
        String conten = Netulie.getConten(strings[0]);
        return conten;
    }
}

}