【发布时间】：2014-01-14 13:56:55
【问题描述】：
我有一个由联系人组成的字符串数组，我从网络服务中获取这些数据。我使用自定义数组适配器来显示列表。我在顶部添加了一个 EditText 进行过滤，它工作正常。现在我想要 UI 右侧的字母，以便用户也可以使用字母进行过滤。我怎样才能做到这一点？
这是我的阵列适配器。
public class EntryAdapter extends ArrayAdapter<Item> implements Filterable,SectionIndexer {
HashMap<String, Integer> alphaIndexer;
String[] sections;
private Context context;
private ArrayList<Item> items;
private ArrayList<Item> fitems;
private LayoutInflater vi;
private contact contact;
private ItemsFilter mFilter;
public EntryAdapter(Context context,ArrayList<Item> items) {
super(context,0, items);
this.context = context;
this.contact=(contact) context;
this.items = items;
vi = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);alphaIndexer = new HashMap<String, Integer>();
int size = items.size();
for (int x = 0; x < size; x++) {
Item s = items.get(x);
String q=s.toString();
// get the first letter of the store
String ch = q.substring(0, 1);
// convert to uppercase otherwise lowercase a -z will be sorted
// after upper A-Z
ch = ch.toUpperCase();
// put only if the key does not exist
if (!alphaIndexer.containsKey(ch))
alphaIndexer.put(ch, x);
}
Set<String> sectionLetters = alphaIndexer.keySet();
// create a list from the set to sort
ArrayList<String> sectionList = new ArrayList<String>(
sectionLetters);
Collections.sort(sectionList);
sections = new String[sectionList.size()];
sections = sectionList.toArray(sections);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return items.size();
}
@Override
public Item getItem(int position) {
// TODO Auto-generated method stub
return super.getItem(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
final Item i = items.get(position);
if (i != null) {
if(i.isSection()){
SectionItem si = (SectionItem)i;
v = vi.inflate(R.layout.list_item_section, null);
v.setOnClickListener(null);
v.setOnLongClickListener(null);
v.setLongClickable(false);
final TextView sectionView = (TextView) v.findViewById(R.id.list_item_section_text);
sectionView.setText(si.getTitle());
}else{
EntryItem ei = (EntryItem)i;
v = vi.inflate(R.layout.entrylist, null);
final TextView title = (TextView)v.findViewById(R.id.list_item_entry_title);
final TextView subtitle = (TextView)v.findViewById(R.id.list_item_entry_summary);
if (title != null)
title.setText(ei.title);
if(subtitle != null)
subtitle.setText(ei.subtitle);
}
}
return v;
}
public Filter getFilter() {
if (mFilter == null) {
mFilter = new ItemsFilter();
}
return mFilter;
}
private class ItemsFilter extends Filter{
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint == null || constraint.length() == 0){
results.values = items;
results.count = items.size();
}
else{
ArrayList<Item> itemsList = new ArrayList<Item>();
for (Item i : items){
if (i.toString().toUpperCase().startsWith(constraint.toString().toUpperCase()))
itemsList.add(i);
}
results.values = itemsList;
results.count = itemsList.size();
}
return results;
}
@Override
protected void publishResults(CharSequence constraint,
FilterResults results) {
if (results.count == 0){
notifyDataSetInvalidated();
}
else{
ArrayList<Item> lst = (ArrayList<Item>)results.values;
ArrayList<Item> itemsList = new ArrayList<Item>(lst);
//this.items=mItems;
items =itemsList;
notifyDataSetChanged();
}
}
}
@Override
public int getPositionForSection(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int getSectionForPosition(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object[] getSections() {
// TODO Auto-generated method stub
return null;
}
}
【问题讨论】：
标签： android