How to Post Data in an Array in Android Using Retrofit 2

Post an array using retrofit 2

You params are not correct that's why you getting 400 error. try like below

Request :

@FormUrlEncoded
@POST("vendor/event/{id}/checkin")
Call<DefaultResponse> updateAttendance(
        @Path("id") int id,
        @Field("attendees") String attendees,
        @Field("token") String token);

Api Call :

    JSONArray attendeesArray=new JSONArray();
    for (int i = 0; i < attendeesTables.size(); i++){
        JSONObject jsonObject=new JSONObject();
        jsonObject.put("id",String.valueOf(attendeesTables.get(i).getId()));
        jsonObject.put("arrival_time",String.valueOf(attendeesTables.get(i).getArrival_time()));
        attendeesArray.put(jsonObject);
    }

    if (attendeesTables.size() > 0) {
        Call<DefaultResponse> call = RetrofitClient.getmInstance().getApi().updateAttendance(event_id,attendeesArray.toString(),token);
        call.enqueue(new Callback<DefaultResponse>() {

            @Override
            public void onResponse(Call<DefaultResponse> call, Response<DefaultResponse> response) {
                Toast.makeText(EventsDetailsActivity.this, response.code()+"", Toast.LENGTH_SHORT).show();
                Toast.makeText(EventsDetailsActivity.this, response.isSuccessful()+"", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onFailure(Call<DefaultResponse> call, Throwable t) {
                Toast.makeText(EventsDetailsActivity.this, t.getMessage(), Toast.LENGTH_SHORT).show();
            }
        });
    }

Android Retrofit 2 - problem with sending the Array<Object> using POST

Post assortment in my problem will be in a list, so to make it works I need to change the Call to

How to post array in retrofit android

@FormUrlEncoded
@POST("service_name") 
   void functionName(
        @FieldMap Map<String, String> learning_objective_uuids, @FieldMap Map<String, String> user_uuids, @Field("note") String note,
        Callback<CallBackClass> callback
    );

Better solution : Use arraylist.. Reference link : johnsonsu

@FormUrlEncoded
    @POST("service_name") 
       void functionName(
            @Field("learning_objective_uuids[]") ArrayList<String> learning_objective_uuids, @Field("user_uuids[]") ArrayList<String> user_uuids, @Field("note") String note,
            Callback<CallBackClass> callback
        );

POST request of an array into JSON with Retrofit 2 Android

I can't understand your question well.
I can explain how to send data into node JS using retrofit2

In android, add this line in the Retrofit interface

@POST("/user/phone/verify")
Call<Void> addNewComment(@Body HashMap<String, String> map);

And add your details about comment here :

HashMap<String,String> map = new HashMap<>();
        map.put("id","your id");
        map.put("image","your image");
        map.put("comment","your comment");
        map.put("password",password);

Then this code call the post method as the above HashMap as body

Call<Void> call = retrofitInterface.executeSignUp(map);
call.enqueue(new Callback<Void>() {
            @Override
            public void onResponse(Call<Void> call, Response<Void> response) {
                if (response.code()==200){
                    //Success
                   
                }else {
                    //An error ocuurred
                    
                }
            }

            @Override
            public void onFailure(Call<Void> call, Throwable t) {
                Log.e("ServerCallback", "onFailure: ",t);
            }
        });

Retrofit How to post data on specific field only?

As per screenshot. body is not required. So it can be like this

@POST("https://www.mmsnusindo.com/api/ver/kunjungan/rejected")
    Call<List<Verify>> verifikasiKunjunganRejected(@Header("api-key") String content_type,
                                                   @Query("id") String id;// please check your id is int or String.
                                                  

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