[Android-Retrofit]#Android

Upload.java

public class Upload {
  
    public interface UserService {
      @Multipart
      @POST("user/uploadavatar")
      Observable<ResponseBody> uploadAvatar(
        @Part("name") RequestBody name,
        @Part MultipartBody.Part file,
      );
  	}  

	public static void avatarUpload(String filePath, Observer<ResponseBody> observer){
		File file = new File(filePath);
        if (!file.exists()){
            Log.e(TAG, "pictureUpload: filePath = " + filePath + "，该文件不存在");
            return;
        }

        RequestBody name = RequestBody.create(MediaType.parse("multipart/form-data"), file.getName());

        RequestBody fileRequestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
        MultipartBody.Part filePart = MultipartBody.Part.createFormData("file", file.getName(), fileRequestBody);

       	UserService()
                .uploadAvatar(name, filePart)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(observer);
    }
}