Avoid some elements in a ArrayAdapter

I'm trying to implement a custom ArrayAdapter for a ListView.

The ArrayList I want to adapt have s开发者_高级运维ome positions I want to ignore. (for example when myobject.getValue()>20) how can I indicate that object shouldn't appear in the ListView?

Returning null in the method getView result in a nullPointerException

public View getView(int position, View convertView, ViewGroup parent)

Thanks in advance

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Filter out your list before you create the adapter. Go through the original list, checking values, and only add the ones you need to a second list. Then use the second list for your adapter.