I found solutions for filters on ListView
and SearchView
on RecyclerView
separately, but I wish to combine them. Is it even possible?
Yes it is possible Your RecyclerView.Adapter
can implement Filterable
. After that you have to override Filter getFilter()
method.
You have to define your own filter as is shown in the code below:
@Override
public Filter getFilter() {
return new YourFilterClass();
}
YourFilterClass
class YourFilterClass extends Filter {
@Override
protected FilterResults performFiltering(CharSequence constraint) {
//Here you have to implement filtering way
final FilterResults results = new FilterResults();
//logic to filtering
results.values = ...
results.count = ...
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
// here you can use result - (f.e. set in in adapter list)
}
}
public class UserListAdapter extends RecyclerView.Adapter<UserListAdapter.ViewHolder> implements Filterable {
private final List<User> userList;
private final List<User> filteredUserList;
private UserFilter userFilter;
public UserListAdapter(Context context) {
this.userList =new ArrayList<>();
this.filteredUserList = new ArrayList<>();
}
///... other methods
@Override
public Filter getFilter() {
if(userFilter == null)
userFilter = new UserFilter(this, userList);
return userFilter;
}
private static class UserFilter extends Filter {
private final UserListAdapter adapter;
private final List<User> originalList;
private final List<User> filteredList;
private UserFilter(UserListAdapter adapter, List<User> originalList) {
super();
this.adapter = adapter;
this.originalList = new LinkedList<>(originalList);
this.filteredList = new ArrayList<>();
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
filteredList.clear();
final FilterResults results = new FilterResults();
if (constraint.length() == 0) {
filteredList.addAll(originalList);
} else {
final String filterPattern = constraint.toString().toLowerCase().trim();
for (final User user : originalList) {
if (user.getName().contains(filterPattern)) {
filteredList.add(user);
}
}
}
results.values = filteredList;
results.count = filteredList.size();
return results;
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
adapter.filteredUserList.clear();
adapter.filteredUserList.addAll((ArrayList<User>) results.values);
adapter.notifyDataSetChanged();
}
}
}
After that in the place when you want to filtering call:
userListAdapter.getFilter().filter(text)