如何在Fragment中进行网络通信

青旅半醒 2022-05-27 06:18 286阅读 0赞

1.我们知道安卓中许多的接口调用都需要用到context,而fragment本身不是一个context

2.最简单的方法就是通过getActivity（）的方法来获得fragment所在的类

3.然后同过该context进行网络通信

4.案例如下：

package com.example.dengjiale.xuanshang.fragment;
    
    import android.app.Activity;
    import android.app.ProgressDialog;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.ListView;
    import android.widget.Toast;
    
    import com.alibaba.fastjson.JSONArray;
    import com.example.dengjiale.xuanshang.R;
    import com.example.dengjiale.xuanshang.activity.MainActivity;
    import com.example.dengjiale.xuanshang.adapter.OrderAdapter;
    import com.example.dengjiale.xuanshang.entity.Order;
    import com.example.dengjiale.xuanshang.utils.NetUtil;
    
    import java.io.IOException;
    import java.util.ArrayList;
    
    import okhttp3.Call;
    import okhttp3.Callback;
    import okhttp3.Response;
    
    /**
     * Created by dengjiale on 2018/4/12.
     */
    
    public class HomeFragment extends Fragment {
       //设置所在activity的引用
        Activity activity;
        ArrayList<Order>orderList;
        OrderAdapter orderAdapter;
        ListView listView;
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            /* 引用创建好的xml布局 */
            View view = inflater.inflate(R.layout.fragment_home,container,false);
            listView=(ListView)view.findViewById(R.id.homeFragment_listview);
            orderList=new ArrayList<>();
            activity=getActivity();
            orderAdapter=new OrderAdapter(orderList,activity);
            getOrderList();
            return view;
    
        }
    
        //列表初始化
        public void getOrderList() {
            final ProgressDialog progressDialog = ProgressDialog.show(activity, "加载中", "请稍后...");
            NetUtil.getOrderList(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    activity.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            progressDialog.dismiss();
                            Toast.makeText(activity, "网络错误", Toast.LENGTH_SHORT).show();
                        }
                    });
    
                }
    
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    final String result = response.body().string();
    
                    activity.runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            progressDialog.dismiss();
                            orderList = (ArrayList<Order>) JSONArray.parseArray(result, Order.class);
                            if (orderList != null) {
    
                                OrderAdapter adapter = new OrderAdapter(orderList, activity);
                                listView.setAdapter(adapter);
                            } else {
                                Toast.makeText(activity, "列表空空如也", Toast.LENGTH_SHORT).show();
                            }
    
                        }
                    });
    
                }
            });
    
    
        }
    }