我使用改装库通过api向服务器发出post请求，发送用户名和密码，并获得会话令牌作为响应。我使用这个令牌（在头中作为承载令牌）向服务器发送纬度和经度的post以获取数据，但是该方法在enqueue（）的onfailure方法中重复结束。

@POST("api/auth/login/username/{username}/password/{password}")
Call<ResponseBody> login(@Path("username")String username, @Path("password")String password);

@POST("api/products/get")
Call<ResponseBody> getData(@Header("Authorization") String authorization);Call<ResponseBody>

主要活动：

Retrofit.Builder builder=new Retrofit.Builder()
                           .baseUrl("fake url")
                           .addConverterFactory(GsonConverterFactory.create());
Retrofit retrofit=builder.build();
DataApi companyApi=retrofit.create(DataApi.class);
private String Token="";tokenCall=comapnyApi.login("data","!fakedata");
        tokenCall.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
                if (response.isSuccessful()){
                    try {
                        Toast.makeText(MainActivity.this, response.body().string(), Toast.LENGTH_SHORT).show();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
                else {
                    Toast.makeText(MainActivity.this, "Wrong Username and password", Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onFailure(Call<ResponseBody> call, Throwable t) {
                Toast.makeText(MainActivity.this, "Couldn't connect to Fake company Server Api", Toast.LENGTH_SHORT).show();
            }
        });
    Call<ResponseBody> Data=companyApi.getData(Token);
    Data.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
            if (response.isSuccessful()){
                try {
                    Toast.makeText(MainActivity.this, response.body().string(), Toast.LENGTH_SHORT).show();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            else {
                Toast.makeText(MainActivity.this, "Api Token Expired", Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            Toast.makeText(MainActivity.this, "Couldn't connect to Fake Company Server", Toast.LENGTH_SHORT).show();
        }
    });