RecyclerView(单)

最新推荐文章于 2021-11-04 22:22:56 发布

Yang_Liu_1

最新推荐文章于 2021-11-04 22:22:56 发布

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本文链接：https://blog.youkuaiyun.com/Yang_Liu_1/article/details/81775169

本文介绍如何在Android应用中使用OkHttp发起网络请求并处理返回的数据。通过实例展示了如何配置OkHttpClient、构建Request对象，并利用回调机制处理响应结果。同时介绍了如何使用Gson解析JSON数据，并展示了一个简单的Recyclerview数据展示流程。

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package com.bwei.day11_lianxi1.activity;

import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.widget.Toast;

import com.bwei.day11_lianxi1.R;
import com.bwei.day11_lianxi1.adapter.SubAdapter;
import com.bwei.day11_lianxi1.bean.UserBean;
import com.google.gson.Gson;

import java.io.IOException;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private Context context;
    private RecyclerView rl_view;
    //1.定义接口
    private static final String url_string = "https://gank.io/api/data/%E7%A6%8F%E5%88%A9/10/1";
    private static final int sove_data = 100;
    //6.定义handler处理信息
    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            //7.接收
            switch (msg.what){
                case sove_data:
                    //12.RecylerView要处理的数据源
                    String responseString = (String) msg.obj;
                    //14.Gson进行解析
                    Gson gson = new Gson();
                    UserBean userBean = gson.fromJson(responseString, UserBean.class);
                    List<UserBean.ResultsBean> beanList = userBean.getResults();
                    Log.i("aaa",beanList.toString());

                    //线性布局管理器
                    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(context, LinearLayoutManager.VERTICAL, false);
                    rl_view.setLayoutManager(linearLayoutManager);
                    //13.将数据源设置给适配器
                    SubAdapter subAdapter = new SubAdapter(context, beanList);
                    rl_view.setAdapter(subAdapter);

                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        //2.请求数据获取数据源
        requestData();
    }

    private void requestData() {
        //3.
        OkHttpClient okHttpClient = new OkHttpClient.Builder().build();
        //4.创建请求
        Request request = new Request.Builder().url(url_string).build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, final IOException e) {
                //10.
                final String errorMessage = e.getMessage().toString();
                //9.
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        //11.
                        Toast.makeText(MainActivity.this,errorMessage,Toast.LENGTH_SHORT).show();
                    }
                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //5.
                String responseString = response.body().string();
                //8.将数据在子线程中处理完毕后发送给主线程
                Message message = handler.obtainMessage();
                message.what = sove_data;
                message.obj = responseString;
                handler.sendMessage(message);
            }
        });
    }

    private void initView() {
        rl_view = findViewById(R.id.rl_view);
        //获取上下文
        context = this;
    }
}