如何从 Web Api 获取 pdf 响应到 Android？

Question

我创建了一个 Web Api 服务，其中 returns 一个 pdf 文件流。如何在 android 中获取此响应并显示为 pdf 文件？我的网站 Api 代码如下

[Route("api/GetPdf")]
    public HttpResponseMessage GetPdf(string PdfName)
    {
        DataAccess objClsData = new DataAccess();
        SqlDataReader _SqlReader;
        _SqlReader = objClsData.ExecuteQuery("select VALUE FROM [Param] where subkey='imagepath'");

        if (_SqlReader.HasRows)
        {
            if (_SqlReader.Read())
            {
                string FileName = WebUtility.UrlDecode(PdfName);
                string PdfFile = _SqlReader["VALUE"].ToString() + "\" + FileName + ".pdf";
                //string PdfFile = _SqlReader["VALUE"].ToString() + "\" + "bill##8000006" + ".pdf";
                HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
                FileStream fileStream = File.OpenRead(PdfFile);
                response.Content = new StreamContent(fileStream);
                response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");

                return response;
            }
        }
        HttpResponseMessage responseError = new HttpResponseMessage(HttpStatusCode.NotFound);
        return responseError;
    }

Answer 1

检查下面的代码片段

new Retrofit.Builder()
  .baseUrl(apiUrl)
  .addConverterFactory(GsonConverterFactory.create())
  .build()
  .create(WebApiEndPoint.class).
  downloadFileWithDynamicUrlSync("File_Url")//Change to your file name
  .enqueue(new retrofit.Callback<ResponseBody>() {


@Override
 public void onResponse(retrofit.Response<ResponseBody> response, Retrofit retrofit) 
        {
          if (response != null && response.body() != null) {
        //response.body() will contains the downloaded file details
        }

       @Override
       public void onFailure(Throwable t) {
        Log.e("Failed to Download file ", "");
        }
    });

WebApiEndPoint.class

@GET("GetPdf")
    Call<ResponseBody> downloadFileWithDynamicUrlSync(@Query("PdfName") String PdfName);