okHttp拦截器放在doGet和doPost请求中

public class OkHttp3Util {

    /**

     * 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 OkHttpClient okHttpClient = null;

    private OkHttp3Util() {

    }

    public static OkHttpClient getInstance() {

        if (okHttpClient == null) {

            //加同步安全

            synchronized (OkHttp3Util.class) {

                if (okHttpClient == null) {

                    //okhttp可以缓存数据....指定缓存路径

                    File sdcache = new File(Environment.getExternalStorageDirectory(), "cache");

                    //指定缓存大小

                    int cacheSize = 10 * 1024 * 1024;

                    okHttpClient = new OkHttpClient.Builder()//构建器

                            .connectTimeout(15, TimeUnit.SECONDS)//连接超时

                            .writeTimeout(20, TimeUnit.SECONDS)//写入超时

                            .readTimeout(20, TimeUnit.SECONDS)//读取超时

                            //.addInterceptor(new CommonParamsInterceptor())//添加的是应用拦截器...公共参数

                            //.addNetworkInterceptor(new CacheInterceptor())//添加的网络拦截器

                            .cache(new Cache(sdcache.getAbsoluteFile(), cacheSize))//设置缓存

                            .build();

                }

            }

        }

        return okHttpClient;

    }

    /**

     * get请求

     * 参数1 url

     * 参数2 回调Callback

     */

    public static void doGet(String oldUrl, Callback callback) {

        //要添加的公共参数...map

        Map<String,String> map = new HashMap<>();

        map.put("source","android");

        StringBuilder stringBuilder = new StringBuilder();//创建一个stringBuilder

        stringBuilder.append(oldUrl);

        if (oldUrl.contains("?")){

            //?在最后面....2类型

            if (oldUrl.indexOf("?") == oldUrl.length()-1){

            }else {

                //3类型...拼接上&

                stringBuilder.append("&");

            }

        }else {

            //不包含? 属于1类型,,,先拼接上?号

            stringBuilder.append("?");

        }

        //添加公共参数....

        for (Map.Entry<String,String> entry: map.entrySet()) {

            //拼接

            stringBuilder.append(entry.getKey())

                    .append("=")

                    .append(entry.getValue())

                    .append("&");

        }

        //删掉最后一个&符号

        if (stringBuilder.indexOf("&") != -1){

            stringBuilder.deleteCharAt(stringBuilder.lastIndexOf("&"));

        }

        String newUrl = stringBuilder.toString();//新的路径

        //创建OkHttpClient请求对象

        OkHttpClient okHttpClient = getInstance();

        //创建Request

        Request request = new Request.Builder().url(newUrl).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 Map<String, String> params post请求的时候给服务器传的数据

     *      add..("","")

     *      add()

     */

    public static void doPost(String url, Map<String, String> params, Callback callback) {

        //要添加的公共参数...map

        Map<String,String> map = new HashMap<>();

        map.put("source","android");

        //创建OkHttpClient请求对象

        OkHttpClient okHttpClient = getInstance();

        //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));

        }

        //添加公共参数

        for (Map.Entry<String,String> entry: map.entrySet()) {

            builder.add(entry.getKey(),entry.getValue());

        }

        //创建Request

        Request request = new Request.Builder().url(url).post(builder.build()).build();

        Call call = okHttpClient.newCall(request);

        call.enqueue(callback);

    }