Change values of ArrayAdapter

Question

I'd like to update values of my ArrayAdapter if the first element is selected :

public ArrayAdapter<String> adapter;
String[] categoriesArray;    
...

adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, categoriesArray);
list.setAdapter(adapter);

list.setOnItemClickListener(new OnItemClickListener(){
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        if(arg2== Consts.GAME_CATEGORY_POSITION){

            adapter.clear();

            //Add new values to array
            categoriesArray = new String[subCategories.size()];
            for (int i=0; i<subCategories.size(); i++) {
                categoriesArray[i] = subCategories.get(i).getSub_name();                    
            }           
            adapter.notifyDataSetChanged();             
        }           
    }           
});

But the clear method (adapter) triggered an exception

12-27 09:37:57.376: E/AndroidRuntime(1423): java.lang.UnsupportedOperationException
12-27 09:37:57.376: E/AndroidRuntime(1423):     at java.util.AbstractList.remove(AbstractList.java:638)
12-27 09:37:57.376: E/AndroidRuntime(1423):     at java.util.AbstractList$SimpleListIterator.remove(AbstractList.java:75)
12-27 09:37:57.376: E/AndroidRuntime(1423):     at java.util.AbstractList.removeRange(AbstractList.java:658)
12-27 09:37:57.376: E/AndroidRuntime(1423):     at java.util.AbstractList.clear(AbstractList.java:466)
12-27 09:37:57.376: E/AndroidRuntime(1423):     at android.widget.ArrayAdapter.clear(ArrayAdapter.java:258)

Any idea ?

Thank you for reading.

where did you initialize your `categoriesArray` for the firstTime ? — Houcine, Dec 27 '12 at 09:55
check out answer to this post http://stackoverflow.com/questions/3200551/unable-to-modify-arrayadapter-in-listview — Praful Bhatnagar, Dec 27 '12 at 09:56

score 8 · Accepted Answer · edited May 23 '17 at 11:58

Pass your own list instead of array to adapter. Adapter converts array to list using Arrays.asList method and list returned by this method doesn't support removal. You can create instance of ArrayList from your array and pass it to adapter:

List<String> values = new ArrayList<String>(Arrays.asList(categoriesArray));
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, values);

But better check very similar question mentioned by @PrafulBhatnagar: Unable to modify ArrayAdapter in ListView: UnsupportedOperationException

score 4 · Answer 2 · edited Dec 23 '19 at 17:55

4

You do not need to reinitialize the adapter, if you just want to change the data set. Try the following code -

adapter.clear();
adapter.addAll(categoriesArray);

edited Dec 23 '19 at 17:55

Mark W. Naylor

3
3

answered Jul 24 '14 at 10:47

0xC0DED00D

19,522
20
117
184

score 2 · Answer 3 · edited May 23 '17 at 11:51

2

check out answer to this post

Unable to modify ArrayAdapter in ListView: UnsupportedOperationException

As per this post you should use ArrayList in place of string array...

edited May 23 '17 at 11:51

Community

1
1

answered Dec 27 '12 at 10:01

Praful Bhatnagar

7,425
2
36
44

Change values of ArrayAdapter

3 Answers3