如何通过Retrofit2发送ArrayList和Multipart？ 错误：预期为begin_object，但为字符串

问题描述

我是新手，现在做了一个多部分主体来上传文件。这是代码：

＃ApiConfig.java

public interface ApiConfig {
    @Multipart
    @POST("upload.PHP")
    Call<ServerResponse> uploadFile(@Part("details[]") ArrayList<String> details,@Part MultipartBody.Part file,@Part("file")RequestBody name);
}

＃AppConfig.java

public class AppConfig {
    private static String BASE_URL = "http://192.168.1.1:8080/xampp/app/";
    private static Gson gson = new GsonBuilder()
            .setLenient()
            .create();
    public static Retrofit getRetrofit() {
        return new Retrofit.Builder()
                .baseUrl(AppConfig.BASE_URL)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();
    }
}

＃ServerResponse.java

public class ServerResponse {
    @Serializedname("success")
    boolean success;
    @Serializedname("message")
    String message;
    public String getMessage() {
        return message;
    }
    boolean getSuccess() {
        return success;
    }
}

＃MainActivity.java

    private void uploadFile(String filePath) {
        File file = new File(filePath);

        RequestBody requestBody = RequestBody.create(MediaType.parse("*/*"),file);
        MultipartBody.Part filetoUpload = MultipartBody.Part.createFormData("file",file.getName(),requestBody);
        RequestBody filename = RequestBody.create(MediaType.parse("text/plain"),file.getName());

        ArrayList<String> details = new ArrayList<>();
        details.add("name");
        details.add("id");
        ApiConfig getResponse = AppConfig.getRetrofit().create(ApiConfig.class);
        Call<ServerResponse> call = getResponse.uploadFile(details,filetoUpload,filename);
        call.enqueue(new Callback<ServerResponse>() {
            @Override
            public void onResponse(Call call,Response response) {
                ServerResponse serverResponse = (ServerResponse) response.body();
                if (serverResponse != null) {
                    Toast.makeText(MainActivity.this,serverResponse.getMessage(),Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this,"There was an error while uploading your file. Please try again later.",Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call call,Throwable t) {
                Toast.makeText(MainActivity.this,Toast.LENGTH_SHORT).show();
            }
        });
    }

通过替换ApiConfig.java中的这一部分，一切工作正常：

Call<ServerResponse> uploadFile(@Part("details[]") ArrayList<String> details,@Part("file")RequestBody name);

只需

Call<ServerResponse> uploadFile(@Part MultipartBody.Part file,@Part("file")RequestBody name);

我收到的错误是

expected begin_object but was string

Retrofit不允许我发送带有文件的数组。请让我知道如何解决此错误，并在PHP文件中接收数组。问候。

解决方法

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