Remove duplicate values from spinner

Question

I am trying to load spinner from json data using following code:

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ArrayList<String> items = getCountries("data.json");

    Spinner spinner = (Spinner)findViewById(R.id.spinnerStandard);
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.second_layout,R.id.txtStandard,items);
    spinner.setAdapter(adapter);
}

private ArrayList<String> getCountries(String fileName){
    JSONArray jsonArray = null;
    ArrayList<String> cList = new ArrayList<String>();
    try {
        InputStream is = getResources().getAssets().open(fileName);
        int size = is.available();
        byte[] data = new byte[size];
        is.read(data);
        is.close();
        String json = new String(data, "UTF-8");
        jsonArray=new JSONArray(json);
        if (jsonArray != null) {
            for (int i = 0; i < jsonArray.length(); i++) {
                cList.add(jsonArray.getJSONObject(i).getString("standard"));
            }
        }
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    catch (JSONException je)
    {
        je.printStackTrace();
    }
    return cList;
}

My json data is,

[
{
    "name":"Manoj",
    "surname":"Jadhav",
    "age":"18",
    "div":"A",
    "standard":"7"
},
{
    "name":"Nilesh",
    "surname":"Patankar",
    "age":"17",
    "div":"B",
    "standard":"7"
},
{
    "name":"Gourav",
    "surname":"Patil",
    "age":"18",
    "div":"A",
    "standard":"8"
},
{
    "name":"Pushkar",
    "surname":"Ganpule",
    "age":"17",
    "div":"A",
    "standard":"7"
},
{
    "name":"Prashant",
    "surname":"Raut",
    "age":"18",
    "div":"A",
    "standard":"8"
},
{
    "name":"Nachiket",
    "surname":"Salvi",
    "age":"17",
    "div":"A",
    "standard":"7"
},
{
    "name":"Hiren",
    "surname":"Lakhmani",
    "age":"18",
    "div":"B",
    "standard":"6"
}

]

In json data I am having duplicate standard values as I want to load only unique values from json into spinner (like there are standard values are 7, 7, 8, 7, 8, 7, 6 and I want to show only 6, 7, 8 out of those duplicate values.)

I've tried googling for all the options and as many other variations as I can think of and can't find any useful results, so I'm obviously missing something.

What is correct way to remove duplicate values ?

Easy way is you have to check in cList weather Standard is already there in it if yes then no need to add otherwise add. I think if(!cList.contains(Standard)) this works — Zaki Pathan, Feb 15 '17 at 10:27

Rajesh Satvara · Accepted Answer · 2017-02-15T10:30:28.957

1

write this code above return cList in your method

HashSet<String> hashSet = new HashSet<String>();
    hashSet.addAll(cList);
    cList.clear();
    cList.addAll(hashSet);

return cList;

or

for (int i = 0; i < jsonArray.length(); i++) {
if(!Clist.contains(jsonArray.getJSONObject(i).getString("standard"))){
    cList.add();
}
}

edited Feb 15 '17 at 10:30

answered Feb 15 '17 at 10:27

Rajesh Satvara

3,842
2
30
50

please mark as Accept then this can help to others also. – Rajesh Satvara Feb 15 '17 at 10:32
contains method is case sensitive. Please have a look at it if you have a concern about case sensitivity – sanjay Feb 15 '17 at 10:54

score 0 · Answer 2 · edited May 23 '17 at 11:53

0

From Array to HashSet

Now you have Unique elements. Transform it to Array again and use it in your adapter. Should do it. Hope this helps.

edited May 23 '17 at 11:53

Community

1
1

answered Feb 15 '17 at 10:25

T.Dimitrov

157
2
7

score 0 · Answer 3 · answered Feb 15 '17 at 10:26

0

if(cList.contains(jsonArray.getJSONObject(i).getString("standard"))){

}else{

   //Add value here..

   cList.add(jsonArray.getJSONObject(i).getString("standard"));

}

answered Feb 15 '17 at 10:26

Rajkumar Kumawat

290
2
11

contains method is case sensitive. Please have a look at it if you have a concern about case sensitivity – sanjay Feb 15 '17 at 10:52

score 0 · Answer 4 · answered Feb 15 '17 at 10:29

0

for (int i = 0; i < jsonArray.length(); i++) {
    if(!cList.contains(jsonArray.getJSONObject(i).getString("standard"))){
        cList.add(jsonArray.getJSONObject(i).getString("standard"));
       }
   }

answered Feb 15 '17 at 10:29

Zaki Pathan

1,762
1
13
26

score 0 · Answer 5 · answered Feb 15 '17 at 10:30

update your iterator to

if (jsonArray != null) {
        for (int i = 0; i < jsonArray.length(); i++) {
            String standard = jsonArray.getJSONObject(i).getString("standard");
            if(!cList.contains(standard))
               cList.add(standard);
        }
    }

score 0 · Answer 6 · answered Feb 15 '17 at 10:53

0

Use contains method if you don't have concern about case sensitivity

answered Feb 15 '17 at 10:53

sanjay

228
2
12

Remove duplicate values from spinner

6 Answers6