Sorry for my sluggishness but I can't figure out how to write a
runable Filter.
This is my theory:
- The ArrayAdapter get the Filter through the getFilter() function
- It triggers the function Filter.filter() to put the work into queue
- When it's excuted, it call Filter.performFiltering() function to get
the results
- The results then is passed to the publishResults() function to
update the ArrayAdapter
And things I can't figureout are:
- If I don't know the mechanism behind the ArrayAdapter and how to
change its filtering behavior. Changing the Filter class is simply not
enough because I don't know how to change the data that will be shown.
If only I know the array or list that the ArrayAdapter uses to store
its filtered data that will be pass to the AutoCompleteTextView, I can
just change it in the publisResults() function.
- One thing I can think about is changing the data that will be passed
from the ArrayAdapter to the AutoCompleteTextView but it seems like if
I want to do that I have to override alot of functions of the Adapter
class and that is not a easy task at all.
I tried this class
--------------
public class MyFilter extends Filter {
@Override
protected FilterResults performFiltering(CharSequence contrain)
{
// TODO Auto-generated method stub
FilterResults fr = new FilterResults();
fr.count = 2;
String[] a = new String[]{"abc","def"};
fr.values = a;
return fr;
}
@Override
protected void publishResults(CharSequence arg0, FilterResults
results) {
// TODO Auto-generated method stub
Log.i("Filter",results.count+"");
if (results.count > 0) {
notifyDataSetChanged();
} else {
notifyDataSetInvalidated();
}
}
}
-------------
And it seems that my theory is somewhat right because I always log the
number that I set in the performFiltering function. But for this
Filter, all my data is shown in the AutoComplete drop down box.
On Apr 3, 10:20 pm, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> > - Where is the data that it need to work with? I can only see
> > constrain in the performFilter() function
>
> The data is the data you pass to the ArrayAdapter. Or the ArrayAdapter's data.
>
> > - For the publishResults() function. What do I need to do with it? I
> > don't see anything like a context that can help me reach out of the
> > class so how can I publish the result?
>
> Just use the notify methods of the Adapter. For instance:
>
> @Override
> protected void publishResults(CharSequence constraint,
> FilterResults results) {
> //noinspection unchecked
> mObjects = (List<T>) results.values;
> if (results.count > 0) {
> notifyDataSetChanged();
> } else {
> notifyDataSetInvalidated();
> }
> }
>
> > - And for the FilterResults class, isn't the values need to be
> > Object[] or List<Object> because it's said to "Contains all the values
> > computed by the filtering operation. ".
>
> No, it has to be an Object. For instance, the CursorAdapter publishes
> a Cursor as the result, not an array or a list.
>
>
>
>
>
> > Thank you.
>
> > On Apr 3, 1:36 am, "Romain Guy" <[EMAIL PROTECTED]> wrote:
> > > Hi,
>
> > > The best thing to do is indeed to override getFilter() and return a
> > > Filter that will do what you are proposing. The current ArrayAdapter's
> > > Filter simply matches the text against the first characters of each
> > > entry of the array.
>
> > > On Wed, Apr 2, 2008 at 10:31 PM, AkaZn <[EMAIL PROTECTED]> wrote:
>
> > > > Hi
>
> > > > I want to somehow emulate the idea T9 Text Input (not it but similar
> > > > to it) and I want to use the AutoCompleteTextView to suggest the user
> > > > the word they can choose. But only overriding the performFiltering
> > > > function of the AutoCompleteTextView class is not enough to do the
> > > > work as use my customize function to do the filter process or at least
> > > > use regex.
>
> > > > So how can I customize the filtering process so that I can customize
> > > > the dropdown list of the AutoCompleteTextView?
>
> > > > I noticed that in the ArrayAdapter class, there is a getFilter()
> > > > function but I don't know if I can do anything with it.
>
> > > > Thank you very much.
>
> > > > ---------------
> > > > For those who are not familiar with the T9:
> > > > http://www.t9.com/
>
> > > --
> > > Romain Guywww.curious-creature.org
>
> --
> Romain Guywww.curious-creature.org
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