Send an array of strings to a server from Android using Retrofit

Question

I want to send an array of strings to the server from an Android app using Retrofit. I have no idea how can I send it and receive it in server side:

//api interface...

@FormUrlEncoded
@POST("sendArray.php")
Call<ResponseModel> sendAns(@Field("ans[]") String[] ans);

//sending array in main activity

String[] ans = {"ans1","ans2","ans3"};
Call<ResponseModel> call = apiObject.sendAns(ans);
call.en....

//server side php code to get array

$ans = $_POST['ans[]'];
$ans1 = $ans[1];

I expected the value of $ans1 = "ans2" but we got nothing.

Why don't you `var_dump($_POST)` to see how's your value looks like, then you know how to access it. — catcon, Jul 22 '19 at 06:13
refer this https://stackoverflow.com/questions/37698715/how-to-send-arrays-lists-with-retrofit — sasikumar, Jul 22 '19 at 06:21

Antonis Radz · Answer 1 · 2019-07-22T06:27:31.040

0

send and receive array like this:

  @POST("sendArray.php")
  Call<ResponseModel> getSomething(@Body String[] ans );

And if you want to name your array then create RequestModel with array inside named as you want. Also you can set name using @SerializedName annotation

public class YourBodyRequest {
    @SerializedName("ans[]")
    public String[] ans;
}

And:


 @POST("sendArray.php")
 Call<ResponseModel> request(@Body YourBodyRequest request );

edited Jul 22 '19 at 06:27

answered Jul 22 '19 at 06:21

Antonis Radz

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Thank you for your time. can you post php code to recieve? – Nitish Kumar Jul 22 '19 at 06:43
At this time,java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.asus.simple.ResponseModel.getResponse()' on a null object reference at com.example.asus.simple.MainActivity$1.onResponse(MainActivity.java:90) – Nitish Kumar Jul 22 '19 at 06:45
For thar please read https://stackoverflow.com/questions/8207488/get-all-variables-sent-with-post – Antonis Radz Jul 22 '19 at 06:45
You getting null because there is no response, also with network and response I would suggest always check for null before doing anything – Antonis Radz Jul 22 '19 at 06:47
$status)); }else{ $status = "error"; echo json_encode(array("response"=>$status)); } ?> – Nitish Kumar Jul 22 '19 at 06:55
it's giving response ok. and I am unable to fix it. – Nitish Kumar Jul 22 '19 at 06:57
use var_dump($_POST) and follow your Post response – Antonis Radz Jul 22 '19 at 06:57

Send an array of strings to a server from Android using Retrofit

1 Answers1