I have created an API: https://agenrumah.id/arumipro/Formdata and i need to get sumber[] from api and store it to my spinner. But i got error:

is there any best practice way to cast the jsonArray object to my spinner?

java.lang.ArrayStoreException: source[0] of type Item_sumber cannot be stored in destination array of type java.lang.String[]

Activity_addcontact.java

    private ArrayList Arraylist_sumber, Arraylist_budget;
    ....
          Call<Formdata> call = jsonPlaceHolderApi.getFormdata();
          call.enqueue(new Callback<Formdata>() {
               @Override
          public void onResponse(Call<Formdata> call, Response<Formdata> response) {
            
          Formdata jsonResponse = response.body();

          String[] string_sumber = Arrays.copyOf(jsonResponse.getSumber(), jsonResponse.getSumber().length,String[].class);
          ArrayAdapter<String> adapter_sumber = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_spinner_dropdown_item, string_sumber);
          dropdown_sumber.setAdapter(adapter_sumber);
          dropdown_sumber.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
         public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                id_sumber = String.valueOf(i   1);
         }
            
         @Override
         public void onNothingSelected(AdapterView<?> adapterView) {
        }
           });
         }
                            @Override
           public void onFailure(Call<Formdata> call, Throwable t) {
            call.cancel();
        }
      });
  }

Item_sumber

    private String id;
    private String nama_sumber;

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getNama_sumber() {
        return nama_sumber;
    }
    public void setNama_sumber(String nama_sumber) {
        this.nama_sumber = nama_sumber;
    }

Formdata.java

public class Formdata {
    private Item_sumber[] sumber;
    private Item_budget[] budget;

    public Item_sumber[] getSumber() {
        return sumber;
    }
    public void setSumber(Item_sumber[] sumber) {
        this.sumber = sumber;
    }
    public Item_budget[] getBudget() {
        return budget;
    }
    public void setBudget(Item_budget[] budget) {
        this.budget = budget;
    }
}

CodePudding user response：

You can use ObjectMapper class of Jackson libraries. It will convert the response that are coming from API in object, syntax--

objectMapper om = new ObjectMapper();
om.readValue(response.body().asString(),FormData[].class);

I think, it would help you.

CodePudding user response：

you are storing Object elements from 'sumber' array in string array 'string_sumber'.

try this

JSONArray sumberArray = jsonresponse.getJsonArray("sumber");

String[] string_sumber = new String[sumberArray.length];

for(int i=0;i<sumberArray.length;i  ){

string_summber[i] = get(i).toString(); 

}

CodePudding user response：

My friend helped me, and I've solved it.

1. Make and convert the jsonarray to Arraylist (object)

2. Make Iteration so you can store it to Array of String[]

3. Done! now cast it to your spinner

        Call<Formdata> call = jsonPlaceHolderApi.getFormdata();
    call.enqueue(new Callback<Formdata>() {
    @Override
     public void onResponse(Call<Formdata> call, Response<Formdata> response) {
   
     Formdata jsonResponse = response.body();
   
     ArrayList<Item_sumber> arraylist_sumber = new ArrayList<>(Arrays.asList(jsonResponse.getSumber()));
   
     ArrayList<String> list_sumber = new ArrayList<>();
     for (int i = 0; i < jsonResponse.getSumber().length; i  ) {
         Item_sumber item_sumber = arraylist_sumber.get(i);
         list_sumber.add(item_sumber.getId());
     }
   
     string_sumber = new String[arraylist_sumber.size()];
   
   
     /* If 2 dimensional array convert
     private String[][] string_sumber2, string_budget2;
     string_sumber2 = new String[arraylist_sumber.size()][6];
     for (int i = 0; i < jsonResponse.getSumber().length; i  ) {
         Item_sumber data = arraylist_sumber.get(i);
         string_sumber2[i] = new String[]{data.getId(),data.getNama_sumber()};
                    }*/
   
     for (int i = 0; i < jsonResponse.getSumber().length; i  ) {
         Item_sumber data = arraylist_sumber.get(i);
         string_sumber[i] = data.getNama_sumber();
         }
   
     ArrayAdapter<String> adapter_sumber = new ArrayAdapter<String>(getBaseContext(), android.R.layout.simple_spinner_dropdown_item, string_sumber);
                    dropdown_sumber.setAdapter(adapter_sumber);
                    dropdown_sumber.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
   
     @Override
     public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
     id_sumber = String.valueOf(i   1);
     }
   
      @Override
      public void onNothingSelected(AdapterView<?> adapterView) {
      }
      });
   
   
      @Override
      public void onFailure(Call<Formdata> call, Throwable t) {
        call.cancel();
     }
    });