1、引用所使用的工具

implementation 'com.squareup.retrofit2:retrofit:2.2.0'
implementation 'com.squareup.retrofit2:converter-gson:2.2.0'
implementation 'com.squareup.retrofit2:adapter-rxjava:2.2.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.5.0'
implementation 'com.squareup.okhttp3:okhttp:3.2.0'

2、添加请求NetInterface

/**
 * 图片上传
 * @param imageName
 * @param file
 * @return
 */
@Multipart
@POST("/unified/service/innerReceiveImage")
Observable<BeasResponse> uploadPic(@Query("imageName") String imageName, @Part MultipartBody.Part file);


/**
 * 请求接口
 *
 * @param businessType
 * @param reqData
 * @return
 */
@FormUrlEncoded
@POST("/unified/service/creditCardService")
Observable<BeasResponse> reqeuest(@Field("accessKey") String accessKey,
                                  @Field("businessType") String businessType,
                                  @Field("reqData") String reqData);

3、网络请求类的封装（NetInterface的使用）

    /**
     * 图片上传
     * @param imageName
     * @param imagePath
     * @return
     */
    public Observable<BeasResponse> ApuploadPIC(String imageName,String imagePath){
        File file = new File(imagePath);
        RequestBody requestFile = RequestBody.create(MediaType.parse("image/jpeg"), file);
        MultipartBody.Part body = MultipartBody.Part.createFormData("image", file.getName(), requestFile);
        return observe(mNetInterface.uploadPic(imageName,body));
    }

    
    public Observable<BeasResponse> ApCheckCardList(CarCheckListRequet carCheckListRequet){
        gson = new Gson();
        String reqData = gson.toJson(carCheckListRequet);
        LogUtil.d(TAG,"reqData = "+reqData);
        return observe(mNetInterface.reqeuest("1193",reqData));