android Okhttp3的简单使用（亲测可用，源码已贴出，如有问题，欢迎留言）

1.先在model中添加所需要的依赖，主要有：

compile 'com.squareup.okhttp3:okhttp:3.9.0'
compile 'com.jakewharton:butterknife:8.8.1'
annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
compile 'com.google.code.gson:gson:2.8.2'

         没有使用过ButterKnife的童鞋可参考https://blog.csdn.net/dreamlivemeng/article/details/51261170和

         https://blog.csdn.net/pigdreams/article/details/65448149（请注意：android studio3.1及其以上版本不兼容                     Butterknife8.8.1）。

2.Activity代码实现@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

（1）父类activity

package com.mobile.administrator.appmine09.base;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

/**
 * Created by Administrator on 2018/9/11 0011.
 */

public abstract class BaseActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

    }

    protected abstract void initData();

    protected abstract void initView();

    protected abstract void showToast(String msg);

    protected abstract void runToUIThread(String dataStr, String showStr);
}

（2）activity

package com.mobile.administrator.appmine09.activity;

import android.Manifest;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;

import com.mobile.administrator.appmine09.R;
import com.mobile.administrator.appmine09.base.BaseActivity;
import com.mobile.administrator.appmine09.bean.ReasonBean;
import com.mobile.administrator.appmine09.callback.LoadCallback;
import com.mobile.administrator.appmine09.manager.Okhttp3Manager;
import com.mobile.administrator.appmine09.utils.MyLogUtil;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import butterknife.BindView;
import butterknife.ButterKnife;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

public class MainActivity extends BaseActivity implements View.OnClickListener {

    @BindView(R.id.tev_get_sync)
    TextView tevGetSync;
    @BindView(R.id.tev_get_async)
    TextView tevGetAsync;
    @BindView(R.id.tev_post_sync)
    TextView tevPostSync;
    @BindView(R.id.tev_post_async)
    TextView tevPostAsync;
    @BindView(R.id.tev_data)
    TextView tevData;
    private Okhttp3Manager manager;
    public static final String GET_URL = "http://v.juhe.cn/toutiao/index?type=历史&key=d05b58fa6901ad9bed77a1ef08bd6ccb";
    public static final String POST_URL = "http://v.juhe.cn/toutiao/index";

    private String url2 = "https://baike.baidu.com/pic/%E6%AD%A6%E7%94%B0%E7%8E%B2%E5%A5%88/16824602/0/32fa828ba61ea8d3ec4ad9129e0a304e251f58bf?fr=lemma&ct=single#aid=0&pic=32fa828ba61ea8d3ec4ad9129e0a304e251f58bf";
    private Map<String, String> map = new HashMap<>();
    private ReasonBean reasonBean;

    private static final String TAG = MainActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        initData();
        initView();
    }

    @Override
    protected void initData() {
        if (Build.VERSION.SDK_INT >= 23) {
            String[] mPermissionList = new String[]{
                    Manifest.permission.WRITE_EXTERNAL_STORAGE,
                    Manifest.permission.ACCESS_FINE_LOCATION,
                    Manifest.permission.CALL_PHONE,
                    Manifest.permission.READ_LOGS,
                    Manifest.permission.READ_PHONE_STATE,
                    Manifest.permission.READ_EXTERNAL_STORAGE,
                    Manifest.permission.SET_DEBUG_APP,
                    Manifest.permission.SYSTEM_ALERT_WINDOW,
                    Manifest.permission.GET_ACCOUNTS,
                    Manifest.permission.WRITE_APN_SETTINGS};
            ActivityCompat.requestPermissions(this, mPermissionList, 123);
        }

        manager = Okhttp3Manager.getInstance(this);
        map.put("type", "娱乐");
        map.put("key", "d05b58fa6901ad9bed77a1ef08bd6ccb");
    }

    @Override
    protected void initView() {
        tevGetSync.setOnClickListener(this);
        tevGetAsync.setOnClickListener(this);
        tevPostSync.setOnClickListener(this);
        tevPostAsync.setOnClickListener(this);
    }

    @Override
    protected void showToast(String msg) {
        Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_SHORT).show();
    }

    /**
     * 请求返回的数据都是在子线程，要把它运行到主线程
     * @param dataStr
     * @param showStr
     */
    @Override
    protected void runToUIThread(final String dataStr, final String showStr) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                showToast(showStr);
                if (!"".equals(dataStr)) {
                    reasonBean = manager.fromJson(1.0, dataStr, ReasonBean.class);
                    MyLogUtil.i(TAG, "dataStr*****" + dataStr);
                    MyLogUtil.i(TAG, "reasonBean.toString()*****" + reasonBean.toString());
                    tevData.setText(dataStr);
                } else {
                    tevData.setText(dataStr);
                }
            }
        });
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.tev_get_sync:
                manager.getSyncOkHttp(GET_URL, new LoadCallback() {
                    @Override
                    public void getSuccess(final String dataStr) {
                        runToUIThread(dataStr, "请求成功！");
                    }

                    @Override
                    public void getFailed() {
                        runToUIThread("", "请求成功！");
                        showToast("请求失败！");
                    }
                });
                break;
            case R.id.tev_get_async:
                manager.getAsyncOkHttp(GET_URL, map, new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        runToUIThread("", "请求失败！");
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        runToUIThread(response.body().string(), "请求成功！");
                    }
                });
                break;
            case R.id.tev_post_sync:
                manager.postSyncOkhttp(POST_URL, map, new LoadCallback() {
                    @Override
                    public void getSuccess(String dataStr) {
                        runToUIThread(dataStr, "请求成功！");
                    }

                    @Override
                    public void getFailed() {
                        runToUIThread("", "请求失败！");
                    }
                });
                break;
            case R.id.tev_post_async:
                manager.postAsyncOkhttp(POST_URL, map, new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        runToUIThread("", "请求失败！");
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        runToUIThread(response.body().string(), "请求成功！");
                    }
                });
                break;
            default:
                break;
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
}

3.Okhttp3代码实现&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

package com.mobile.administrator.appmine09.manager;

import android.content.Context;

import com.google.gson.ExclusionStrategy;
import com.google.gson.FieldAttributes;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.mobile.administrator.appmine09.callback.LoadCallback;
import com.mobile.administrator.appmine09.utils.MyLogUtil;

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

/**
 * Created by Administrator on 2018/9/8 0008.
 */

public class Okhttp3Manager {


    private OkHttpClient client;
    private static Okhttp3Manager manager;
    private Gson gson;
    private static final String TAG = Okhttp3Manager.class.getSimpleName();

    /**
     * 单例模式，所以构造函数私有化
     */
    private Okhttp3Manager() {
        //创建OkHttpClient对象
        client = new OkHttpClient.Builder()
                .connectTimeout(5 * 1000, TimeUnit.MILLISECONDS) //链接超时
                .readTimeout(10 * 1000, TimeUnit.MILLISECONDS) //读取超时
                .writeTimeout(10 * 1000, TimeUnit.MILLISECONDS) //写入超时
                .build();
        gson = new GsonBuilder().setVersion(1.0)
                .create();
    }

    /**
     * 线程安全的单例模式，整个项目中只有一个okhttp3实例
     * @param context
     * @return
     */
    public static Okhttp3Manager getInstance(Context context) {
        if (manager == null) {
            synchronized (Okhttp3Manager.class) {
                if (manager == null) {
                    manager = new Okhttp3Manager();
                }
            }
        }
        return manager;
    }

    /**
     * 同步请求  写了一个接口把值放入
     */
    public void getSyncOkHttp(String url, final LoadCallback loadCallback) {
        //调用ok的get请求
        Request request = new Request.Builder()
                .get()
                .url(url)
                .build();
        final Call call = client.newCall(request);
        //同步execute
        //同步请求
        //同步是耗时的
        //同步execute需要开启子线程
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    Response response = call.execute();
                    if (response.isSuccessful()) {
                        String string = response.body().string();
                        //调用者只需要实现provide方法就能拿到这个String了
                        loadCallback.getSuccess(string);
                    } else {
                        loadCallback.getFailed();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }

    /**
     * get拼接传值方法（异步请求）
     *
     * @param url ?username=xxxx&password=xxx
     */
    public void getAsyncOkHttp(String url, Map<String, String> map, Callback callback) {
        StringBuffer sb = new StringBuffer();
        String string = "";
        String result = "";
        //当用户传入null或者传了一个空的map
        if (map != null && !map.isEmpty()) {
            for (Map.Entry<String, String> entry : map.entrySet()) {
                if (sb == null) {
//                    sb = new StringBuffer ();
                    sb.append("?");
                } else {
                    //拼接好的网站去掉最后一个“&”符号
                    sb.append("&");
                }
                sb.append(entry.getKey() + "=" + entry.getValue());
            }
        }
        if (sb.toString() != null) {
            string = sb.toString();
            MyLogUtil.i(TAG, string);
            result = url + string;
            MyLogUtil.i(TAG, result);
        }
        Request request = new Request.Builder()
                .get() //声明我是get请求,如果不写默认就是get
                .url(string == "" ? url : result)//声明网站访问的网址
                .build();//创建Request
        Call call = client.newCall(request);
        //同步execute,异步enqueue
        //这里的同步是耗时的
        //而且OK 也没有为我们开启子线程
        // 如果你用同步方法的话，需要开启子线程
        call.enqueue(callback);
    }

    /**
     * Post请求（同步请求）
     * <p>
     * FormBody:用来提交一个不包涵文件的参数
     * 第
     */
    public void postSyncOkhttp(String url, Map<String, String> map, final LoadCallback loadCallback) {
        //上传文字格式 数据的传输，区别于多媒体输出
        FormBody.Builder formbody = new FormBody.Builder();
        if (map != null && !map.isEmpty()) {
            //上传参数
            for (String key : map.keySet()) {
                formbody.add(key, map.get(key));
            }
            //创建请求体
            FormBody body = formbody.build();
            Request request = new Request.Builder()
                    .post(body)
                    .url(url)
                    .build();
            final Call call = client.newCall(request);
            //同步请求方式
            //同步execute
            //同步请求
            //同步是耗时的
            //同步execute需要开启子线程
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Response response = call.execute();
                        if (response.isSuccessful()) {
                            String string = response.body().string();
                            //调用者只需要实现provide方法就能拿到这个String了
                            loadCallback.getSuccess(string);
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
        } else {
            //创建请求体
            FormBody body = formbody.build();
            Request request = new Request.Builder()
                    .post(body)
                    .url(url)
                    .build();
            final Call call = client.newCall(request);
            //同步请求方式
            //同步execute
            //同步请求
            //同步是耗时的
            //同步execute需要开启子线程
            new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        Response response = call.execute();
                        if (response.isSuccessful()) {
                            String string = response.body().string();
                            //调用者只需要实现provide方法就能拿到这个String了
                            loadCallback.getSuccess(string);
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }).start();
        }
    }

    /**
     * Post请求（异步请求）
     * <p>
     * FormBody:用来提交一个不包涵文件的参数
     * 第
     */
    public void postAsyncOkhttp(String url, Map<String, String> map, Callback callBack) {
        //上传文字格式 数据的传输，区别于多媒体输出
        FormBody.Builder formbody = new FormBody.Builder();
        if (map != null && !map.isEmpty()) {
            //上传参数
            for (String key : map.keySet()) {
                formbody.add(key, map.get(key));
            }
            //创建请求体
            FormBody body = formbody.build();
            Request request = new Request.Builder()
                    .url(url)
                    .post(body)//请求体
                    .build();
            Call call = client.newCall(request);
            //异步请求方式
            call.enqueue(callBack);
        } else {
            //创建请求体
            FormBody body = formbody.build();
            Request request = new Request.Builder()
                    .url(url)
                    .post(body)
                    .build();
            Call call = client.newCall(request);
            //异步请求方式
            call.enqueue(callBack);
        }
    }

    /**
     * MultipartBody：用来提交包涵文件的参数（异步请求）
     *
     * @param path    :路径
     * @param map     ：普通参数
     * @param img     ：提交文件的关键字
     * @param imgPath ：提交文件的路径
     */
    public void postFileOkhttp(String path, HashMap<String, String> map, String img, String imgPath, Callback callBack) {
        MultipartBody.Builder requestBody = new MultipartBody.Builder();
        if (map != null && !map.isEmpty()) {
            //上传参数
            for (String key : map.keySet()) {
                requestBody.addFormDataPart(key, map.get(key));
            }
            File file = new File(imgPath);
            requestBody.addFormDataPart(img, file.getPath()
                    , RequestBody.create(MediaType.parse("image/png"), file));
            Request request = new Request.Builder()
                    .post(requestBody.build())
                    .url(path)
                    .build();
            Call call = client.newCall(request);
            call.enqueue(callBack);
        } else {
            File file = new File(imgPath);
            requestBody.addFormDataPart(img, file.getPath()
                    , RequestBody.create(MediaType.parse("image/png"), file));
            Request request = new Request.Builder()
                    .post(requestBody.build())
                    .url(path)
                    .build();
            Call call = client.newCall(request);
            call.enqueue(callBack);
        }
    }

    /**
     * 用于将指定的Object对象序列化成相应的JSON数据
     *
     * @param version
     * @param object
     * @return
     */
    public String toJson(double version, Object object) {
        return gson.toJson(object);
    }

    /**
     * 用于将JsonElement对象（可以是JsonObject、JsonArray等）转换成JSON数据
     *
     * @param version
     * @param jsonElement
     * @return
     */
    public String toJson(double version, JsonElement jsonElement) {
        String str = gson.toJson(jsonElement);
        return str;
    }

    /**
     * @param jsonStr
     * @param classOfT
     * @param <T>
     * @return
     */
    public <T> T fromJson(double version, String jsonStr, Class<T> classOfT) {
        return gson.fromJson(jsonStr, classOfT);
    }
}

4.自定义接口回调代码实现&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

package com.mobile.administrator.appmine09.callback;

/**
 * Created by ${周康} on ${Study}.
 */

public interface LoadCallback {

    void getSuccess(String dataStr);

    void getFailed();
}

5.实体类代码实现&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

package com.mobile.administrator.appmine09.bean;

import java.util.List;

/**
 * Created by Administrator on 2018/9/9 0009.
 */

public class ReasonBean {

    private String reason;
    private ResultBean result;
    private int error_code;

    public String getReason() {
        return reason;
    }

    public void setReason(String reason) {
        this.reason = reason;
    }

    public ResultBean getResult() {
        return result;
    }

    public void setResult(ResultBean result) {
        this.result = result;
    }

    public int getError_code() {
        return error_code;
    }

    public void setError_code(int error_code) {
        this.error_code = error_code;
    }

    public static class ResultBean {
        
        private String stat;
        private List<DataBean> data;

        public String getStat() {
            return stat;
        }

        public void setStat(String stat) {
            this.stat = stat;
        }

        public List<DataBean> getData() {
            return data;
        }

        public void setData(List<DataBean> data) {
            this.data = data;
        }

        public static class DataBean {
     
            private String uniquekey;
            private String title;
            private String date;
            private String category;
            private String author_name;
            private String url;
            private String thumbnail_pic_s;
            private String thumbnail_pic_s02;
            private String thumbnail_pic_s03;

            public String getUniquekey() {
                return uniquekey;
            }

            public void setUniquekey(String uniquekey) {
                this.uniquekey = uniquekey;
            }

            public String getTitle() {
                return title;
            }

            public void setTitle(String title) {
                this.title = title;
            }

            public String getDate() {
                return date;
            }

            public void setDate(String date) {
                this.date = date;
            }

            public String getCategory() {
                return category;
            }

            public void setCategory(String category) {
                this.category = category;
            }

            public String getAuthor_name() {
                return author_name;
            }

            public void setAuthor_name(String author_name) {
                this.author_name = author_name;
            }

            public String getUrl() {
                return url;
            }

            public void setUrl(String url) {
                this.url = url;
            }

            public String getThumbnail_pic_s() {
                return thumbnail_pic_s;
            }

            public void setThumbnail_pic_s(String thumbnail_pic_s) {
                this.thumbnail_pic_s = thumbnail_pic_s;
            }

            public String getThumbnail_pic_s02() {
                return thumbnail_pic_s02;
            }

            public void setThumbnail_pic_s02(String thumbnail_pic_s02) {
                this.thumbnail_pic_s02 = thumbnail_pic_s02;
            }

            public String getThumbnail_pic_s03() {
                return thumbnail_pic_s03;
            }

            public void setThumbnail_pic_s03(String thumbnail_pic_s03) {
                this.thumbnail_pic_s03 = thumbnail_pic_s03;
            }

            @Override
            public String toString() {
                return "DataBean{" +
                        "uniquekey='" + uniquekey + '\'' +
                        ", title='" + title + '\'' +
                        ", date='" + date + '\'' +
                        ", category='" + category + '\'' +
                        ", author_name='" + author_name + '\'' +
                        ", url='" + url + '\'' +
                        ", thumbnail_pic_s='" + thumbnail_pic_s + '\'' +
                        ", thumbnail_pic_s02='" + thumbnail_pic_s02 + '\'' +
                        ", thumbnail_pic_s03='" + thumbnail_pic_s03 + '\'' +
                        '}';
            }
        }

        @Override
        public String toString() {
            return "ResultBean{" +
                    "stat='" + stat + '\'' +
                    ", data=" + data +
                    '}';
        }
    }

    @Override
    public String toString() {
        return "ReasonBean{" +
                "reason='" + reason + '\'' +
                ", result=" + result +
                ", error_code=" + error_code +
                '}';
    }

}

6.工具类代码实现&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

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package com.mobile.administrator.appmine09.utils;

import android.util.Log;

/**
 * Created by Administrator on 2018/4/26 0026.
 */

public class MyLogUtil {

    //规定每段显示的长度
    private static int LOG_MAXLENGTH = 2000;

    public static void i(String TAG, String msg) {
        int strLength = msg.length();
        int start = 0;
        int end = LOG_MAXLENGTH;
        for (int i = 0; i < 100; i++) {
            //剩下的文本还是大于规定长度则继续重复截取并输出
            if (strLength > end) {
                Log.i(TAG + i, msg.substring(start, end));
                start = end;
                end = end + LOG_MAXLENGTH;
            } else {
                Log.i(TAG, msg.substring(start, strLength));
                break;
            }
        }
    }
}

7.布局文件代码实现&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.mobile.administrator.appmine09.activity.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal"
        android:layout_gravity="center">

        <TextView
            android:id="@+id/tev_get_sync"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:gravity="center"
            android:layout_gravity="center"
            android:text="getSync"
            android:textColor="@color/colorPrimary"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/tev_get_async"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:gravity="center"
            android:layout_gravity="center"
            android:text="getASync"
            android:textColor="@color/colorPrimary"
            android:textSize="20sp" />

    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal"
        android:layout_gravity="center">

        <TextView
            android:id="@+id/tev_post_sync"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:gravity="center"
            android:layout_gravity="center"
            android:text="postSync"
            android:textColor="@color/colorPrimary"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/tev_post_async"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:gravity="center"
            android:layout_gravity="center"
            android:text="postASync"
            android:textColor="@color/colorPrimary"
            android:textSize="20sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="5">

        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="10dp">

            <TextView
                android:id="@+id/tev_data"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Hello World!"
                android:textColor="@color/colorPrimary"
                android:textSize="18sp" />

        </ScrollView>
    </LinearLayout>

</LinearLayout>

8.最后别忘了添加权限&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&

<uses-permission android:name="android.permission.INTERNET"/>