自定义拦截器

MyInterceptor post

public class MyInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        //获取原始的请求数据
        Request orginRequest = chain.request();
        //先获取原始的请求参数，然后再拼接起来
        FormBody orginBody = (FormBody) orginRequest.body();
        FormBody.Builder builder = new FormBody.Builder();
        for (int i = 0; i < orginBody.size(); i++) {
            String name = orginBody.name(i);
            String value = orginBody.value(i);
            builder.add(name, value);
        }
        builder.add("source", "android");
        FormBody formBody = builder.build();
        Request request = new Request.Builder().url(orginRequest.url()).post(formBody).build();

        return chain.proceed(request);

    }
}

　get自定义拦截器

public class MyInterceptor implements Interceptor{
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        HttpUrl url = request.url();
        String string = url.url().toString();
        String resultUrl = string+"&source=android";

        Request request1 = request.newBuilder().url(resultUrl).build();

        return chain.proceed(request);
    }
}

网络请求类

public class HttpUtils {
    private static HttpUtils httpUtils;
    private final OkHttpClient client;

    private HttpUtils() {
        //创建OkHttpClient
        //创建拦截器

        client = new OkHttpClient.Builder()
                .addInterceptor(new MyInterceptor())
                .build();
    }

    public static HttpUtils getHttpUtils() {
        if (httpUtils == null) {
            synchronized (HttpUtils.class) {
                if (httpUtils == null) {
                    httpUtils = new HttpUtils();
                }
            }
        }
        return httpUtils;
    }

    /**
     * GET请求
     *
     * @param url      请求地址
     * @param callback 回调
     */
    public void doGet(String url, Callback callback) {
        Request request = new Request.Builder().url(url).build();
        client.newCall(request).enqueue(callback);
    }

    /**
     * POST请求
     *
     * @param url      请求地址
     * @param params   请求的参数
     * @param callback 回调
     */
    public void doPost(String url, Map<String, String> params, Callback callback) {
        //这里可以加网络判断

        //判断参数
        if (params == null || params.size() == 0) {
            throw new RuntimeException("params is null！！！");
        }
        // 创建Request
        FormBody.Builder builder = new FormBody.Builder();
        for (Map.Entry<String, String> entry : params.entrySet()) {
            builder.add(entry.getKey(), entry.getValue());
        }
        FormBody formBody = builder.build();
        Request request = new Request.Builder()
                .url(url)
                .post(formBody)
                .build();
        client.newCall(request).enqueue(callback);
    }
}