我有自定义ArrayAdapter：
public class CallAdapter extends ArrayAdapter<CallItem> implements Filterable{
View view;
ContactHolder holder = null;
int color = 0;
Context context;
int layoutResourceId;
public static int rowHeight = 0;
private ViewSwitcher switcher;
List<CallItem> contacts = null;
Map<ContactItem, View> contactViewMap = ContactsViewMapSingletone.getInstance().getOrderViewMap();
private ArrayList<CallItem> filtredContacts;
private Filter filter;
public CallAdapter(Context context, int layoutResourceId,List<CallItem> contacts) {
super(context, layoutResourceId, contacts);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.contacts = contacts;
this.filtredContacts = new ArrayList<CallItem>();
this.filtredContacts.addAll(contacts);
}
@Override
public CallItem getItem(int arg0) {
return contacts.get(arg0);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
/** * метод для привязки элементов UI к данным конкретного контакта */
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
view = row;
if(row == null)
{
LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.call_item, parent, false);
holder = new ContactHolder();
holder.contactIcon = (ImageView)row.findViewById(R.id.contactIcon);
holder.contactName = (CustomTextView)row.findViewById(R.id.contactName);
holder.contactNumber = (CustomTextView)row.findViewById(R.id.contactNumber);
holder.contactDays = (CustomTextView)row.findViewById(R.id.contactDays);
row.setTag(holder);
}
else
{
holder = (ContactHolder)row.getTag();
}
CallItem contact = contacts.get(position);
try
{
holder.contactIcon.setBackgroundResource(contact.getIcon());
holder.contactName.setText(contact.getName());
holder.contactNumber.setText(contact.getDays());
}
catch(Exception e)
{
e.printStackTrace();
}
return row;
}
@Override
public Filter getFilter()
{
if (filter == null)
filter = new CallFilter();
return filter;
}
static class ContactHolder
{
ImageView contactIcon;
CustomTextView contactName;
CustomTextView contactNumber;
CustomTextView contactDays;
}
@SuppressLint("DefaultLocale")
private class CallFilter extends Filter
{
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
Log.i(" filtered value", constraint.toString());
FilterResults results = new FilterResults();
String prefix = constraint.toString().toLowerCase();
if (prefix == null || prefix.length() == 0)
{
results.values = contacts;
results.count = contacts.size();
}
else
{
final ArrayList<CallItem> list = new ArrayList<CallItem>();
synchronized (this)
{
list.addAll(contacts);
}
filtredContacts.clear();
int count = list.size();
for (int i=0; i<count; i++)
{
final CallItem pkmn = list.get(i);
if(pkmn.getName().toLowerCase(Locale.getDefault()).contains(constraint))
{
Log.i("found pref",pkmn.toString() );
filtredContacts.add(pkmn);
}
}
Log.i("prefix",prefix);
for(int i = 0, l = filtredContacts.size(); i < l; i++)
{
Log.i("filtered list",filtredContacts.get(i).toString());
}
results.values = filtredContacts;
results.count = filtredContacts.size();
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
filtredContacts = (ArrayList<CallItem>)results.values;
notifyDataSetChanged();
clear();
for(int i = 0, l = filtredContacts.size(); i < l; i++)
{
add(filtredContacts.get(i));
}
notifyDataSetChanged();
}
}
}
但我需要过滤不是按名称的项目，而是按图标过滤。因此，用户选择应该过滤项目的图标，并查看带有这些项目的项目列表，顶部有此图标。我试图在performFiltering中实现这个（传递int作为参数），但它必须得到CharSequence参数。我需要实现此功能，不是像往常一样在EditText中键入值，而是在另一个Activity中获取icon int并返回到我的列表并查看已过滤的项目。对不起我的英语不好。
答案 0 :(得分：0)
我不是通过使用自定义过滤器解决它，但实现可能不是那么优雅，但可行的解决方案。当我使用int值返回我的Fragment时，应该过滤适配器，我喜欢这样：
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode==1)
{
if(resultCode == 0)
{
adapter.clear();
ArrayList<CallItem> filtered = new ArrayList<CallItem>();
int a=0;
for (CallItem call : adapter.getItems())
{
if (call.getIcon() == R.drawable.incoming_call)
{
Log.i("item to filter", call.toString());
adapter.insert(call, a);
a++;
}
else
{
filtered.add(call);
}
}
adapter.addAll(filtered);
adapter.notifyDataSetChanged();
}
else if (resultCode==1)
{
adapter.clear();
ArrayList<CallItem> filtered = new ArrayList<CallItem>();
int a=0;
for (CallItem call : adapter.getItems())
{
if (call.getIcon() == R.drawable.outgoing_call)
{
Log.i("item to filter", call.toString());
adapter.insert(call, a);
a++;
}
else
{
filtered.add(call);
}
}
adapter.addAll(filtered);
adapter.notifyDataSetChanged();
}
else if(resultCode==2)
{
adapter = new CallAdapter(getActivity(),
R.layout.call_item, faq.getDisplayCalls(getActivity()));
contancts_list.setAdapter(adapter);
}
}
}
正如我所提到的，也许它不那么优雅，但对我来说可行。希望它对某人有用。