Frag_01 ——接收上两个_frag ="窗口-优快云博客

本文介绍了一个使用AsyncTask在Android应用中从网络加载数据并更新UI的示例。通过一个具体的Fragment实现，展示了如何在网络请求成功后解析JSON数据，并利用自定义适配器更新ListView的内容。

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package com.example.day_02;

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.Adapter;
import android.widget.ListView;
import android.widget.Toast;

import com.example.MyAdapter.MyAdapter;
import com.google.gson.Gson;

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

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

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

// 切换布局
View view = inflater.inflate(R.layout.frag_01, container, false);
listView = view.findViewById(R.id.listview);
NetUtli utli = new NetUtli();
return view;
}

@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    NetUtli netUtli = new NetUtli();
    boolean netConnect = netUtli.isNetConnection(getActivity());
    if (netConnect) {
        myAdapter = new MyAdapter(list, getActivity());
        listView.setAdapter(myAdapter);
        Anck anck = new Anck();
        anck.execute(DateUrl);
    } else {
        Toast.makeText(getActivity(), "检查网络", Toast.LENGTH_SHORT).show();
    }
}

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.notifyDataSetChanged();
        super.onPostExecute(s);

    }

    @Override
    protected String doInBackground(String... strings) {
        String s = NetUtli.getNetDate(strings[0]);
        return s;
    }
}

}