How to upload empty file with Retrofit 2? - rest

Question

I successfully set up an uploading images to my REST API via retrofit with this code:
File imageFile = ImagePicker.getFileFromResult(this, resultCode, data);
RequestBody requestFile =
RequestBody.create(MediaType.parse("multipart/form-data"), imageFile);
MultipartBody.Part body =
MultipartBody.Part.createFormData("userpic", imageFile.getName(), requestFile);
RetrofitClient.compositeSubscription.add(RetrofitClient.getService().updateProfileUserpic("Token " + RevolutionApp.getInstance().getUserToken(), body).subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Profile>() {
#Override
public void onCompleted() { }
#Override
public void onError(Throwable e) { }
#Override
public void onNext(Profile profile) {
mProfileFragment.fetchProfileData();
}
}));
Now I need to send empty file (null) to my my API. How to implement it?
MultipartBody.Part.createFormData("userpic", imageFile.getName(), requestFile)
does not work

Answer 1

i don't Know this is the right way to do this,i tried like this.its working
MultipartBody.Part fileToUpload = null;
if (realPath != null) {
try {
File file = new File(realPath);
if (file.exists()) {
RequestBody requestBody = RequestBody.create(MediaType.parse("*/*"), file);
fileToUpload = MultipartBody.Part.createFormData("attachment", file.getName(), requestBody);
}
} catch (NullPointerException e) {
e.printStackTrace();
}
}else{
RequestBody attachmentEmpty = RequestBody.create(MediaType.parse("text/plain"), "");
fileToUpload = MultipartBody.Part.createFormData("attachment", "", attachmentEmpty);
}
Note: File Name should not be null ,in place of null use empty("").

Answer 2

Here is final solution:
API interface method to update model:
public void updateProfileData(ProfilePost profile, final OnProfileUpdatedListener listener) {
Observable<Profile> observable;
if (profile.getUserpicPart() != null) {
observable = RetrofitClient.getService().updateProfileData(profile.asHashMap(), profile.getUserpicPart());
} else {
observable = RetrofitClient.getService().updateProfileData(profile.asHashMap());
}
RetrofitClient.compositeSubscription.add(observable
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<Profile>() {
...
}));
}
Retrofit method signature:
#PUT("/api/v1/profile/")
#Multipart
Observable<Profile> updateProfileData(#Header("Authorization") String authorization, #PartMap() Map<String, RequestBody> partMap, #Part MultipartBody.Part image);
#PUT("/api/v1/profile/")
#Multipart
Observable<Profile> updateProfileData(#Header("Authorization") String authorization, #PartMap() Map<String, RequestBody> partMap);
and model to post:
public class ProfilePost {
MultipartBody.Part userpicPart;
public HashMap<String, RequestBody> asHashMap() {
HashMap<String, RequestBody> result = new HashMap<>();
result.put("first_name", RequestBody.create(MediaType.parse("text/plain"), this.firstName));
result.put("last_name", RequestBody.create(MediaType.parse("text/plain"), this.lastName));
result.put("email", RequestBody.create(MediaType.parse("text/plain"), this.email));
}
public void getUserpicPart() {
if (this.userpicFile == null) {
return null;
}
return MultipartBody.Part.createFormData("userpic", this.userpicFile.getName(), requestFile);
}
}