RecycleView + OkHttp3 + SwipeRefreshLayout 实战

【需要注意的是网络处理过程中会遇到很多坑，不能在主线程中执行网络操作，必须采用子线程。子线程中不要弹出对话框或者打印Log日志，会报错。】

参考代码：

MainActivity.java

package com.zscdumin.test;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import butterknife.Bind;
import butterknife.ButterKnife;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public class MainActivity extends AppCompatActivity {
    @Bind(R.id.recycleView)
    RecyclerView recycleView;
    MyAdpter adapter;
    List<String> list = new ArrayList<>();
    @Bind(R.id.fresh)
    SwipeRefreshLayout fresh;
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 0x101:
                    if (fresh.isRefreshing()) {
                        adapter.notifyDataSetChanged();
                        fresh.setRefreshing(false);//设置不刷新
                    }
                    break;
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        list = new ArrayList<>();
        download();
        adapter = new MyAdpter(this, list, onRecyclerviewItemClickListener);
        LinearLayoutManager layoutmanager = new LinearLayoutManager(this);
        layoutmanager.setOrientation(LinearLayoutManager.VERTICAL);
        recycleView.setLayoutManager(layoutmanager);
        recycleView.setAdapter(adapter);
        fresh.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light,
                android.R.color.holo_orange_light, android.R.color.holo_red_light);
        fresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                download();
            }
        });
    }
    private MyAdpter.OnRecyclerviewItemClickListener onRecyclerviewItemClickListener = new MyAdpter.OnRecyclerviewItemClickListener() {
        @Override
        public void onItemClickListener(View v, int position) {
            //这里的view就是我们点击的view  position就是点击的position
            Toast.makeText(MainActivity.this, " ItemClick点击了 " + position, Toast.LENGTH_SHORT).show();
        }
        @Override
        public void onItemLongClickListener(View v, int position) {
            Toast.makeText(MainActivity.this, " ItemOnLongClick点击了 " + position, Toast.LENGTH_SHORT).show();
        }
    };
    public void download() {
        //主线程中不允许执行网络操作，开辟子线程
        new Thread(new Runnable() {
            @Override
            public void run() {
                getData();
            }
        }).start();
    }
    public void getData() {
        OkHttpClient client = new OkHttpClient();
        RequestBody requestBody = new FormBody.Builder()
                .add("code", "10001")
                .add("password", "123456")
                .build();
        Request request = new Request.Builder().
                url("http://115.157.192.47:8080/mes/user/getByCode")
                .post(requestBody)
                .build();
        Response response = null;
        try {
            response = client.newCall(request).execute();
            String responseData = response.body().string();
            Log.i("TAG", responseData);
            JSONObject jsonObject = new JSONObject(responseData);
            JSONObject data = jsonObject.optJSONObject("data");
            JSONArray roles = data.optJSONArray("roles");
            for (int i = 0; i < roles.length(); i++) {
                JSONObject item = roles.getJSONObject(i);
                JSONArray modules = item.optJSONArray("models");
                for (int j = 0; j < modules.length(); j++) {
                    list.add(modules.getJSONObject(j).optString("name"));
                }
            }
            handler.sendEmptyMessage(0x101);//通过handler发送一个更新数据的标记
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
}

MyAdapter

package com.zscdumin.test;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public class MyAdpter extends RecyclerView.Adapter<MyAdpter.MyViewHolder> implements View.OnClickListener, View.OnLongClickListener {
    private Context context;
    private List<String> list;
    private OnRecyclerviewItemClickListener mOnRecyclerviewItemClickListener = null;
    public MyAdpter(Context context, List<String> list, OnRecyclerviewItemClickListener onRecyclerviewItemClickListener) {
        this.context = context;
        this.list = list;
        this.mOnRecyclerviewItemClickListener = onRecyclerviewItemClickListener;
    }
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
        view.setOnClickListener(this);
        view.setOnLongClickListener(this);
        MyViewHolder viewHolder = new MyViewHolder(view);
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        String s = list.get(position);
        holder.textView.setText(s);
        holder.imageView.setImageResource(R.mipmap.ic_launcher);
        holder.itemView.setTag(position);//给view设置tag以作为参数传递到监听回调方法中
    }
    @Override
    public void onClick(View v) {
        //将监听传递给自定义接口
        mOnRecyclerviewItemClickListener.onItemClickListener(v, ((int) v.getTag()));
    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    @Override
    public boolean onLongClick(View v) {
        mOnRecyclerviewItemClickListener.onItemLongClickListener(v, ((int) v.getTag()));
        return true;
    }
    static class MyViewHolder extends RecyclerView.ViewHolder {
        ImageView imageView;
        TextView textView;
        public MyViewHolder(View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageView);
            textView = itemView.findViewById(R.id.textView);
        }
    }
    public interface OnRecyclerviewItemClickListener {
        void onItemClickListener(View v, int position);
        void onItemLongClickListener(View v, int position);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/fresh"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <android.support.v7.widget.RecyclerView
            android:id="@+id/recycleView"
            android:layout_width="match_parent"
            android:layout_height="match_parent">
        </android.support.v7.widget.RecyclerView>
    </android.support.v4.widget.SwipeRefreshLayout>
</LinearLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <ImageView
        android:id="@+id/imageView"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@mipmap/ic_launcher" />
    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center"
        android:text="你好"
        android:textSize="20dp" />
</LinearLayout>