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package cgeo.geocaching.search;
import org.apache.commons.lang3.StringUtils;
import rx.functions.Func1;
import android.content.Context;
import android.widget.ArrayAdapter;
import android.widget.Filter;
/**
* The standard auto completion only matches user input at word boundaries. Therefore searching "est" will not match
* "test". This adapter matches everywhere.
*
*/
public class AutoCompleteAdapter extends ArrayAdapter<String> {
private final static String[] EMPTY = new String[0];
private String[] suggestions = EMPTY;
private final Func1<String, String[]> suggestionFunction;
public AutoCompleteAdapter(final Context context, final int textViewResourceId, final Func1<String, String[]> suggestionFunction) {
super(context, textViewResourceId);
this.suggestionFunction = suggestionFunction;
}
@Override
public int getCount() {
return suggestions.length;
}
@Override
public String getItem(final int index) {
return suggestions[index];
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(final CharSequence constraint) {
final FilterResults filterResults = new FilterResults();
if (constraint == null) {
return filterResults;
}
final String trimmed = StringUtils.trim(constraint.toString());
if (StringUtils.length(trimmed) >= 2) {
final String[] newResults = suggestionFunction.call(trimmed);
// Assign the data to the FilterResults, but do not yet store in the global member.
// Otherwise we might invalidate the adapter and cause an IllegalStateException.
filterResults.values = newResults;
filterResults.count = newResults.length;
}
return filterResults;
}
@Override
protected void publishResults(final CharSequence constraint, final FilterResults filterResults) {
if (filterResults != null && filterResults.count > 0) {
suggestions = (String[]) filterResults.values;
notifyDataSetChanged();
}
else {
notifyDataSetInvalidated();
}
}
};
}
}
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