RecyclerView 实现listview和gridview布局(各自的子布局不同,网络数据)

梦里梦外; 2022-06-07 07:19 113阅读 0赞

1.  导入依赖:（app的build.gradle中）
2.  MainActivity的布局：
3.  写子页面布局:
4.  写分割线的类：
5.  注册Myapp类，同时写一个单例，以节省资源，并初始化
6.  使用已经封装好的OkHttp3的Utils
7.  在MainActivity中判断网络状态
8.  initView方法:
9.  添加RecyclerView的适配器(内部类):
10. 最终的效果图，有些图片没有出来，接口的问题：

## 1.导入依赖:（app的build.gradle中） ##

dependencies {

/*recyclerview*/
        compile 'com.github.liuguangqiang.SuperRecyclerView:super-recyclerview:0.1.2'
    /*imgageloader*/
        compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
    
    /*okhttp3导入依赖*/
        compile 'com.squareup.okio:okio:1.5.0'
        compile 'com.squareup.okhttp3:okhttp:3.2.0'
        compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
        compile 'com.google.code.gson:gson:2.8.2'
    /*Logger依赖*/
        compile 'com.orhanobut:logger:1.15'}

}

## 2.MainActivity的布局： ##

## 3.写子页面布局: ##

样式一:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="wrap_content">
    
        <ImageView
            android:id="@+id/goodsimg"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@mipmap/ic_launcher"
            />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dp"
            >
            <TextView
                android:id="@+id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:text="标题111111111"
                android:textSize="15dp"
                android:textStyle="bold"
                />
            <TextView
                android:layout_marginTop="40dp"
                android:id="@+id/price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:text="价格:"
                android:textStyle="bold"
                />
        </LinearLayout>
    
    </LinearLayout>

样式二:

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="wrap_content">
    
        <ImageView
            android:id="@+id/goodsimg"
            android:layout_width="100dp"
            android:layout_height="100dp"
            android:src="@mipmap/ic_launcher"
            />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dp"
            >
            <TextView
                android:id="@+id/title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:text="标题111111111"
                android:textSize="15dp"
                android:textStyle="bold"
                />
            <TextView
                android:layout_marginTop="40dp"
                android:id="@+id/price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:text="价格:"
                android:textStyle="bold"
                />
        </LinearLayout>
    
    </LinearLayout>

## 4.写分割线的类： ##

DividerItemDecoration

import android.content.Context;
    import android.content.res.TypedArray;
    import android.graphics.Canvas;
    import android.graphics.Rect;
    import android.graphics.drawable.Drawable;
    import android.support.v7.widget.LinearLayoutManager;
    import android.support.v7.widget.RecyclerView;
    import android.view.View;
    
    /**
     * Created by xue on 2017-10-14.
     */
    
    public class DividerItemDecoration extends RecyclerView.ItemDecoration {
    
        private static final int[] ATTRS = new int[]{
                android.R.attr.listDivider
        };
    
        public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
    
        public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
    
        private Drawable mDivider;
    
        private int mOrientation;
    
        public DividerItemDecoration(Context context, int orientation) {
            final TypedArray a = context.obtainStyledAttributes(ATTRS);
            mDivider = a.getDrawable(0);
            a.recycle();
            setOrientation(orientation);
        }
    
        public void setOrientation(int orientation) {
            if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
                throw new IllegalArgumentException("invalid orientation");
            }
            mOrientation = orientation;
        }
    
        @Override
        public void onDraw(Canvas c, RecyclerView parent) {
    
            if (mOrientation == VERTICAL_LIST) {
                drawVertical(c, parent);
            } else {
                drawHorizontal(c, parent);
            }
    
        }
    
    
        public void drawVertical(Canvas c, RecyclerView parent) {
            final int left = parent.getPaddingLeft();
            final int right = parent.getWidth() - parent.getPaddingRight();
    
            final int childCount = parent.getChildCount();
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);
                android.support.v7.widget.RecyclerView v = new android.support.v7.widget.RecyclerView(parent.getContext());
                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int top = child.getBottom() + params.bottomMargin;
                final int bottom = top + mDivider.getIntrinsicHeight();
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    
        public void drawHorizontal(Canvas c, RecyclerView parent) {
            final int top = parent.getPaddingTop();
            final int bottom = parent.getHeight() - parent.getPaddingBottom();
    
            final int childCount = parent.getChildCount();
            for (int i = 0; i < childCount; i++) {
                final View child = parent.getChildAt(i);
                final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                        .getLayoutParams();
                final int left = child.getRight() + params.rightMargin;
                final int right = left + mDivider.getIntrinsicHeight();
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(c);
            }
        }
    
        @Override
        public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {
            if (mOrientation == VERTICAL_LIST) {
                outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
            } else {
                outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
            }
        }
     } 5.注册Myapp类，同时写一个单例，以节省资源，并初始化imageLoader

import android.app.Application;
    
    import com.nostra13.universalimageloader.core.ImageLoader;
    import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
    
    /**
     * Created by xue on 2017-10-14.
     */
    //写个单例，节省资源
    public class MyApp extends Application{
    
            public static MyApp mInstance;
            @Override
            public void onCreate() {
                super.onCreate();
                mInstance = this;
                //初始化imageloader
                ImageLoaderConfiguration configuration = ImageLoaderConfiguration.createDefault(getApplicationContext());
                ImageLoader.getInstance().init(configuration);
            }
            public static MyApp getInstance() {
                return mInstance;
            }
    }

## 6.使用已经封装好的OkHttp3的Utils ##

![Center][]

## 7.在MainActivity中判断网络状态 ##

/*判断网络状态*/
        private void initNet() {
            boolean netWorkAvailable = NetWorkUtils.isNetWorkAvailable(this);
            if (!netWorkAvailable){
                Toast.makeText(BuySearchActivity.this, "联网：" + netWorkAvailable, Toast.LENGTH_SHORT).show();
            }
            /*请求网络数据*/
            getData();
        }
    记得请求网络数据需要添加权限:
        <uses-permission android:name="android.permission.INTERNET"/>
        <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
        <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
    接下来用GsonFormat生成bean类，然后得到网络数据:
        //得到网路数据
        public void getData() {
    
            OkHttp3Utils.getInstance().doGet(path, new GsonObjectCallback<SuperClass>() {
    
    
                @Override
                public void onUi(SuperClass superClass) {
                    newslist = superClass.getNewslist();
                    list = new ArrayList<SuperClass.NewslistBean>();
                    list= (ArrayList<SuperClass.NewslistBean>) newslist;
                }
    
                @Override
                public void onFailed(Call call, IOException e) {
    
                }
            });
        }

## 8.initView方法: ##

private void initView() {
    
            recyclerview = (RecyclerView) findViewById(R.id.recyclerview);
            change = (Button) findViewById(R.id.change);
            /*listview*/
            recyclerview.setLayoutManager(new LinearLayoutManager(this));
            myAdapter = new MyAdapter();
            recyclerview.setAdapter(myAdapter);
            /*分割线*/
            recyclerview.addItemDecoration(new DividerItemDecoration(this,
                    DividerItemDecoration.HORIZONTAL_LIST));
            recyclerview.addItemDecoration(new DividerItemDecoration(this,
                    DividerItemDecoration.VERTICAL_LIST));
    
            //改变视图样式
            change.setOnClickListener(new View.OnClickListener() {
                boolean flag = false;
    	// 利用开关切换recyclerview的布局
                @Override
                public void onClick(View v) {
                    if (flag){
                        type=1;
                        recyclerview.setLayoutManager(new LinearLayoutManager(BuySearchActivity.this));
                        flag=false;
                    }else{
                        type=2;
                        recyclerview.setLayoutManager(new GridLayoutManager(BuySearchActivity.this,2));
                        flag=true;
                    }
                }
            });
        }

## 9.添加RecyclerView的适配器(内部类):   int type = 1;   建一个type来区分一下子布局的样式 ##

/*适配器*/
        class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>
        {
    
            private MyViewHolder holder;
    
            @Override
            public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
            {
                if (viewType==1){
    
                    holder =  new MyViewHolder(LayoutInflater.from(
                            BuySearchActivity.this).inflate(R.layout.itemone, parent,
                            false));
                }else{
                    holder = new MyViewHolder(LayoutInflater.from(
                            BuySearchActivity.this).inflate(R.layout.itemtwo, parent,
                            false));
                }
    
    
                return holder;
            }
    
            @Override
            public int getItemViewType(int position) {
                return type;
            }
    
            @Override
            public void onBindViewHolder(MyViewHolder holder, int position)
            {
                holder.title.setText(list.get(position).getTitle());
                ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.goodsimg);
                holder.price.setText(list.get(position).getCtime());
            }
    
            @Override
            public int getItemCount()
            {
                return list==null?0:list.size();
            }
    
            class MyViewHolder extends RecyclerView.ViewHolder
            {
    
                TextView title;
                ImageView goodsimg;
                TextView price;
    
                public MyViewHolder(View view) {
                    super(view); title = (TextView) view.findViewById(R.id.title);
                    goodsimg = (ImageView) view.findViewById(R.id.goodsimg);
                    price = (TextView) view.findViewById(R.id.price);
                }
    
            }
        }

## 10.最终的效果图，有些图片没有出来，接口的问题： ##

![Center 1][]

##  ##

## 如果要实现多条目，只需要重写 ##

@Override
    public int getItemViewType(int position) {
        return position%2;
    }

效果:

![Center 2][]

## **最后再添加点击事件：** ##

写接口回调类：

public interface ItemClickLitener {
    
        void onItemClick(View view, int position);
    
        void onItemLongClick(View view, int position);
    
        //    Item 内部View点击
        public void onItemSubViewClick(View view, int postion);
    }

在适配器内:

private ItemClickLitener mItemClickListener;
            public void setItemClickListener(ItemClickLitener mItemClickListener) {
                this.mItemClickListener = mItemClickListener;
    
            }
     @Override
            public void onBindViewHolder(final MyViewHolder holder, final int position)
            {
                holder.title.setText(list.get(position).getTitle());
                ImageLoader.getInstance().displayImage(list.get(position).getPicUrl(),holder.goodsimg);
                holder.price.setText(list.get(position).getCtime());
                // 为图片添加监听回调
                holder.goodsimg.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        if (null != mItemClickListener) {
                            /*点击图片*/
                            mItemClickListener.onItemSubViewClick(holder.goodsimg,position);
                        }
                    }
                });
            }
            }
    
    class MyViewHolder extends RecyclerView.ViewHolder
            {
    
                TextView title;
                ImageView goodsimg;
                TextView price;
    
                public MyViewHolder(final View view) {
                    super(view); title = (TextView) view.findViewById(R.id.title);
                    goodsimg = (ImageView) view.findViewById(R.id.goodsimg);
                    price = (TextView) view.findViewById(R.id.price);
    
                    //为item添加普通点击回调
                    view.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            if (null != mItemClickListener) {
                                mItemClickListener.onItemClick(view, getPosition());
                            }
                        }
                    });
    
                    /* 长按回调*/
                    view.setOnLongClickListener(new View.OnLongClickListener() {
                        @Override
                        public boolean onLongClick(View v) {
                            if (null != mItemClickListener) {
                                mItemClickListener.onItemLongClick(view, getPosition());
                            }
                            return true;
                        }
                    });
                }
    
            }

最后在initView方法中调用

/*条目点击事件*/
            myAdapter.setItemClickListener(new ItemClickLitener() {
                @Override
                public void onItemClick(View view, int postion) {
                    Toast.makeText(BuySearchActivity.this,"点击了item"+postion,Toast.LENGTH_SHORT).show();
                }
    
                @Override
                public void onItemLongClick(View view, int postion) {
                    Toast.makeText(BuySearchActivity.this,"长按了item"+postion,Toast.LENGTH_SHORT).show();
                }
    
                @Override
                public void onItemSubViewClick(View view, int postion) {
                    Toast.makeText(BuySearchActivity.this,"点击了img"+postion,Toast.LENGTH_SHORT).show();
                }
            });

最后是点击事件的效果图：

![Center 3][]

## 最后是工具类的代码： ##

GsonArrayCallback

import android.os.Handler;
    
    import com.google.gson.Gson;
    import com.google.gson.JsonArray;
    import com.google.gson.JsonElement;
    import com.google.gson.JsonParser;
    
    import java.io.IOException;
    import java.lang.reflect.ParameterizedType;
    import java.lang.reflect.Type;
    import java.util.ArrayList;
    import java.util.List;
    
    import okhttp3.Call;
    import okhttp3.Callback;
    import okhttp3.Response;
    
    /**
     * 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类
     * 该类的onUi() onFailed()方法运行在主线程
     * 2. @author forever
     * 3. @date 2017/9/24 18:47
     */
    
    public abstract class GsonArrayCallback<T> implements Callback {
        private Handler handler = OkHttp3Utils.getInstance().getHandler();
    
        //主线程处理
        public abstract void onUi(List<T> list);
    
        //主线程处理
        public abstract void onFailed(Call call, IOException e);
    
        //请求失败
        @Override
        public void onFailure(final Call call, final IOException e) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    onFailed(call, e);
                }
            });
        }
    
        //请求json 并直接返回集合 主线程处理
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            final List<T> mList = new ArrayList<T>();
    
            String json = response.body().string();
            JsonArray array = new JsonParser().parse(json).getAsJsonArray();
    
            Gson gson = new Gson();
    
            Class<T> cls = null;
            Class clz = this.getClass();
            ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();
            Type[] types = type.getActualTypeArguments();
            cls = (Class<T>) types[0];
    
            for(final JsonElement elem : array){
                //循环遍历把对象添加到集合
                mList.add((T) gson.fromJson(elem, cls));
            }
    
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        onUi(mList);
    
    
    
                    }
                });
    
    
        }
    }

GsonObjectCallback

import android.os.Handler;
    
    import com.google.gson.Gson;
    
    import java.io.IOException;
    import java.lang.reflect.ParameterizedType;
    import java.lang.reflect.Type;
    
    import okhttp3.Call;
    import okhttp3.Callback;
    import okhttp3.Response;
    
    /**
     * 1. 类的用途 如果要将得到的json直接转化为集合 建议使用该类
     * 该类的onUi() onFailed()方法运行在主线程
     * 2. @author forever
     * 3. @date 2017/9/24 18:47
     */
    
    public abstract class GsonObjectCallback<T> implements Callback {
        private Handler handler = OkHttp3Utils.getInstance().getHandler();
    
    
    
        //主线程处理
        public abstract void onUi(T t);
    
        //主线程处理
        public abstract void onFailed(Call call, IOException e);
    
        //请求失败
        @Override
        public void onFailure(final Call call, final IOException e) {
            handler.post(new Runnable() {
                @Override
                public void run() {
                    onFailed(call, e);
                }
            });
        }
    
        //请求json 并直接返回泛型的对象 主线程处理
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            String json = response.body().string();
            Class<T> cls = null;
    
            Class clz = this.getClass();
            ParameterizedType type = (ParameterizedType) clz.getGenericSuperclass();
            Type[] types = type.getActualTypeArguments();
            cls = (Class<T>) types[0];
            Gson gson = new Gson();
            final T t = gson.fromJson(json, cls);
            handler.post(new Runnable() {
                @Override
                public void run() {
                onUi(t);
                }
            });
        }
    }

NetWorkUtils

import android.content.Context;
    import android.net.ConnectivityManager;
    import android.net.NetworkInfo;
    
    /**
     * 1. 类的用途 联网判断
     * 2. @author forever
     * 3. @date 2017/9/8 12:30
     */
    
    public class NetWorkUtils {
        //判断网络是否连接
        public static boolean isNetWorkAvailable(Context context) {
            //网络连接管理器
            ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            //网络信息
            NetworkInfo info = connectivityManager.getActiveNetworkInfo();
            if (info != null) {
                return true;
            }
    
            return false;
        }
    
    }

OkHttp3Utils

import android.content.Context;
    import android.content.Intent;
    import android.net.Uri;
    import android.os.Environment;
    import android.os.Handler;
    import android.os.Looper;
    import android.util.Log;
    import android.widget.Toast;
    
    import com.bway.www.MyApp;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Map;
    import java.util.concurrent.TimeUnit;
    
    import okhttp3.Cache;
    import okhttp3.CacheControl;
    import okhttp3.Call;
    import okhttp3.Callback;
    import okhttp3.FormBody;
    import okhttp3.Interceptor;
    import okhttp3.MediaType;
    import okhttp3.MultipartBody;
    import okhttp3.OkHttpClient;
    import okhttp3.Request;
    import okhttp3.RequestBody;
    import okhttp3.Response;
    import okhttp3.logging.HttpLoggingInterceptor;
    
    /**
     * 1. 类的用途 封装OkHttp3的工具类 用单例设计模式
     * 2. @author forever
     * 3. @date 2017/9/6 09:19
     */
    
    public class OkHttp3Utils {
        /**
         * 懒汉 安全 加同步
         * 私有的静态成员变量 只声明不创建
         * 私有的构造方法
         * 提供返回实例的静态方法
         */
    
        private static OkHttp3Utils okHttp3Utils = null;
    
        private OkHttp3Utils() {
        }
    
        public static OkHttp3Utils getInstance() {
            if (okHttp3Utils == null) {
                //加同步安全
                synchronized (OkHttp3Utils.class) {
                    if (okHttp3Utils == null) {
                        okHttp3Utils = new OkHttp3Utils();
                    }
                }
    
            }
    
            return okHttp3Utils;
        }
    
        private static OkHttpClient okHttpClient = null;
    
        public synchronized static OkHttpClient getOkHttpClient() {
            if (okHttpClient == null) {
                //判空 为空创建实例
                // okHttpClient = new OkHttpClient();
    /**
     * 和OkHttp2.x有区别的是不能通过OkHttpClient直接设置超时时间和缓存了，而是通过OkHttpClient.Builder来设置，
     * 通过builder配置好OkHttpClient后用builder.build()来返回OkHttpClient，
     * 所以我们通常不会调用new OkHttpClient()来得到OkHttpClient，而是通过builder.build()：
     */
                //  File sdcache = getExternalCacheDir();
                //缓存目录
                File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");
                int cacheSize = 10 * 1024 * 1024;
                //OkHttp3拦截器
                HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor(new HttpLoggingInterceptor.Logger() {
                    @Override
                    public void log(String message) {
                        Log.i("xxx", message.toString());
                    }
                });
                //Okhttp3的拦截器日志分类 4种
                httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    
    
                okHttpClient = new OkHttpClient.Builder().connectTimeout(15, TimeUnit.SECONDS)
                        //添加OkHttp3的拦截器
                        .addInterceptor(httpLoggingInterceptor)
                        .addNetworkInterceptor(new CacheInterceptor())
                        .writeTimeout(20, TimeUnit.SECONDS).readTimeout(20, TimeUnit.SECONDS)
                        .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))
                        .build();
            }
            return okHttpClient;
        }
    
        private static Handler mHandler = null;
    
        public synchronized static Handler getHandler() {
            if (mHandler == null) {
                mHandler = new Handler();
            }
    
            return mHandler;
        }
    
        /**
         * get请求
         * 参数1 url
         * 参数2 回调Callback
         */
    
        public static void doGet(String url, Callback callback) {
    
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getOkHttpClient();
            //创建Request
            Request request = new Request.Builder().url(url).build();
            //得到Call对象
            Call call = okHttpClient.newCall(request);
            //执行异步请求
            call.enqueue(callback);
    
    
        }
    
        /**
         * post请求
         * 参数1 url
         * 参数2 回调Callback
         */
    
        public static void doPost(String url, Map<String, String> params, Callback callback) {
    
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getOkHttpClient();
            //3.x版本post请求换成FormBody 封装键值对参数
    
            FormBody.Builder builder = new FormBody.Builder();
            //遍历集合
            for (String key : params.keySet()) {
                builder.add(key, params.get(key));
    
            }
    
    
            //创建Request
            Request request = new Request.Builder().url(url).post(builder.build()).build();
    
            Call call = okHttpClient.newCall(request);
            call.enqueue(callback);
    
        }
    
        /**
         * post请求上传文件
         * 参数1 url
         * 参数2 回调Callback
         */
        public static void uploadPic(String url, File file, String fileName) {
            //创建OkHttpClient请求对象
            OkHttpClient okHttpClient = getOkHttpClient();
            //创建RequestBody 封装file参数
            RequestBody fileBody = RequestBody.create(MediaType.parse("application/octet-stream"), file);
            //创建RequestBody 设置类型等
            RequestBody requestBody = new MultipartBody.Builder().setType(MultipartBody.FORM).addFormDataPart("file", fileName, fileBody).build();
            //创建Request
            Request request = new Request.Builder().url(url).post(requestBody).build();
    
            //得到Call
            Call call = okHttpClient.newCall(request);
            //执行请求
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
    
                }
    
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    //上传成功回调 目前不需要处理
                }
            });
    
        }
    
        /**
         * Post请求发送JSON数据
         * 参数一：请求Url
         * 参数二：请求的JSON
         * 参数三：请求回调
         */
        public static void doPostJson(String url, String jsonParams, Callback callback) {
            RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), jsonParams);
            Request request = new Request.Builder().url(url).post(requestBody).build();
            Call call = getOkHttpClient().newCall(request);
            call.enqueue(callback);
    
    
        }
    
        /**
         * 下载文件 以流的形式把apk写入的指定文件 得到file后进行安装
         * 参数一：请求Url
         * 参数二：保存文件的路径名
         * 参数三：保存文件的文件名
         */
        public static void download(final Context context, final String url, final String saveDir) {
            Request request = new Request.Builder().url(url).build();
            Call call = getOkHttpClient().newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                    Log.i("xxx", e.toString());
                }
    
                @Override
                public void onResponse(Call call, final Response response) throws IOException {
    
                    InputStream is = null;
                    byte[] buf = new byte[2048];
                    int len = 0;
                    FileOutputStream fos = null;
                    try {
                        is = response.body().byteStream();
                        //apk保存路径
                        final String fileDir = isExistDir(saveDir);
                        //文件
                        File file = new File(fileDir, getNameFromUrl(url));
                        fos = new FileOutputStream(file);
                        while ((len = is.read(buf)) != -1) {
                            fos.write(buf, 0, len);
                        }
                        fos.flush();
                        //apk下载完成后 调用系统的安装方法
                        Intent intent = new Intent(Intent.ACTION_VIEW);
                        intent.setDataAndType(Uri.fromFile(file), "application/vnd.android.package-archive");
                        context.startActivity(intent);
                    } catch (IOException e) {
                        e.printStackTrace();
                    } finally {
                        if (is != null) is.close();
                        if (fos != null) fos.close();
    
    
                    }
                }
            });
    
        }
    
        /**
         * @param saveDir
         * @return
         * @throws IOException 判断下载目录是否存在
         */
        public static String isExistDir(String saveDir) throws IOException {
            // 下载位置
            if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    
                File downloadFile = new File(Environment.getExternalStorageDirectory(), saveDir);
                if (!downloadFile.mkdirs()) {
                    downloadFile.createNewFile();
                }
                String savePath = downloadFile.getAbsolutePath();
                Log.e("savePath", savePath);
                return savePath;
            }
            return null;
        }
    
        /**
         * @param url
         * @return 从下载连接中解析出文件名
         */
        private static String getNameFromUrl(String url) {
            return url.substring(url.lastIndexOf("/") + 1);
        }
    
        /**
         * 为okhttp添加缓存，这里是考虑到服务器不支持缓存时，从而让okhttp支持缓存
         */
        private static class CacheInterceptor implements Interceptor {
            @Override
            public Response intercept(Chain chain) throws IOException {
                // 有网络时 设置缓存超时时间1个小时
                int maxAge = 60 * 60;
                // 无网络时，设置超时为1天
                int maxStale = 60 * 60 * 24;
                Request request = chain.request();
                if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {
                    //有网络时只从网络获取
                    request = request.newBuilder().cacheControl(CacheControl.FORCE_NETWORK).build();
                } else {
                    //无网络时只从缓存中读取
                    request = request.newBuilder().cacheControl(CacheControl.FORCE_CACHE).build();
                   /* Looper.prepare();
                    Toast.makeText(MyApp.getInstance(), "走拦截器缓存", Toast.LENGTH_SHORT).show();
                    Looper.loop();*/
                }
                Response response = chain.proceed(request);
                if (NetWorkUtils.isNetWorkAvailable(MyApp.getInstance())) {
                    response = response.newBuilder()
                            .removeHeader("Pragma")
                            .header("Cache-Control", "public, max-age=" + maxAge)
                            .build();
                } else {
                    response = response.newBuilder()
                            .removeHeader("Pragma")
                            .header("Cache-Control", "public, only-if-cached, max-stale=" + maxStale)
                            .build();
                }
                return response;
            }
        }
    }

**参考了鸿洋的博客：**http://blog.csdn.net/lmj623565791/article/details/45059587

[Center]: /images/20220607/ad322ec2b321413ca0c3f168aa1b1380.png
[Center 1]: /images/20220607/d4fda4d253d64040bf6e35fbab09eb58.png
[Center 2]: /images/20220607/2d3b80abf5db4c9fa60f1e1fd4d324c9.png
[Center 3]: /images/20220607/a469213e689745d5924eef9ec6954712.png