的ListView ArrayAdapter过滤 - 重复项目 [英] ListView ArrayAdapter filtering - duplicate items
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问题描述
我想筛选自定义列表视图适配器。当我开始的EditText列表视图上打字应该被过滤。下面是适配器的code。自定义对象已经覆盖toString方法返回其facebook的用户的名称。我没有覆盖ArrayAdapter方法的getItem，添加或删除。
I trying to filter listview with custom adapter. When I start typing on edittext the list view should be filtered. Below is the code of adapter. The custom object has overridden method toString which return the name of the facebook user. I didn't override ArrayAdapter methods getItem,add or remove.
public class FacebookFriendsAdapter extends ArrayAdapter<FacebookUser> {
private Activity activity;
public ImageLoader imageLoader;
private HashMap<String, Integer> alphaIndexer;
private String[] sections = new String[0];
private boolean enableSections;
public FacebookFriendsAdapter(Context context, int textViewResourceId,ArrayList<FacebookUser> newItems) {
super(context, textViewResourceId, newItems);
imageLoader = new ImageLoader(context.getApplicationContext());
}
public static class ViewHolder {
public TextView text;
public ImageView image;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
FacebookUser fcbu = getItem(position);
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = vi.inflate(R.layout.facebook_friendslist_row, null);
final ViewHolder holder = new ViewHolder();
holder.text = (TextView) rowView.findViewById(R.id.facebook_rowFriendName);
holder.image = (ImageView) rowView.findViewById(R.id.facebookRowUserFoto);
rowView.setTag(holder);
} else {
rowView = convertView;
}
ViewHolder holder = (ViewHolder) rowView.getTag();
String imageurl = "http://graph.facebook.com/" + fcbu.getId()+ "/picture";
holder.text.setText(fcbu.getName());
holder.image.setTag(imageurl);
imageLoader.DisplayImage(imageurl, holder.image);
return rowView;
}
}
在其持有的EditText我创建了一个TextWatcher例如活动：
On the activity which hold EditText I created a TextWatcher like:
private TextWatcher filterTextWatcher = new TextWatcher() {
public void afterTextChanged(Editable s) {
}
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
public void onTextChanged(CharSequence s, int start, int before,
int count) {
facebookAdapter.getFilter().filter(s);
}
};
一切正常预期过滤列表后，经过滤项是重复的。
Everything works fine expect that after the list is filtered the filtered items are duplicated.
A将AP preciate任何想法可能会导致此。
谢谢
A would appreciate any idea what may cause this. Thanks
推荐答案
我解决了这个问题，感谢为<一个href=\"http://stackoverflow.com/questions/2519317/how-to-write-a-custom-filter-for-listview-with-arrayadapter\">How写一个自定义过滤器与ArrayAdapter 的ListView。
I solved the problem thanks to How to write a custom filter for ListView with ArrayAdapter.
下面是改编自定义适配器
Below is the adapted custom Adapter
public class FBAdapter extends ArrayAdapter<FacebookUser> {
public ImageLoader imageLoader;
private ArrayList<FacebookUser> items;
private ArrayList<FacebookUser> originalItems = new ArrayList<FacebookUser>();
private FBAdapterFilter filter;
private final Object mLock = new Object();
public FBAdapter(Context context, int textViewResourceId,
ArrayList<FacebookUser> newItems) {
super(context, textViewResourceId, newItems);
imageLoader = new ImageLoader(context);
items = newItems;
cloneItems(newItems);
}
protected void cloneItems(ArrayList<FacebookUser> items) {
for (Iterator iterator = items.iterator(); iterator.hasNext();) {
FacebookUser gi = (FacebookUser) iterator.next();
originalItems.add(gi);
}
}
@Override
public int getCount() {
synchronized (mLock) {
return items != null ? items.size() : 0;
}
}
@Override
public FacebookUser getItem(int item) {
FacebookUser gi = null;
synchronized (mLock) {
gi = items != null ? items.get(item) : null;
}
return gi;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View rowView = convertView;
final FacebookUser fcbu = getItem(position);
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
rowView = vi.inflate(R.layout.facebook_friendslist_row, null);
final ViewHolder holder = new ViewHolder();
holder.text = (TextView) rowView
.findViewById(R.id.facebook_rowFriendName);
holder.image = (ImageView) rowView
.findViewById(R.id.facebookRowUserFoto);
holder.checkbox = (CheckBox) rowView
.findViewById(R.id.chkInviteFacebookFriend);
holder.checkbox
.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
FacebookUser element = (FacebookUser) holder.checkbox
.getTag();
element.setSelected(buttonView.isChecked());
holder.checkbox.setTag(element);
}
});
rowView.setTag(holder);
holder.checkbox.setTag(fcbu);
} else {
rowView = convertView;
((ViewHolder) rowView.getTag()).checkbox.setTag(fcbu);
}
ViewHolder holder = (ViewHolder) rowView.getTag();
String imageurl = "http://graph.facebook.com/" + fcbu.getId()
+ "/picture";
holder.text.setText(fcbu.getName());
holder.image.setTag(imageurl);
holder.checkbox.setChecked(fcbu.isSelected());
imageLoader.DisplayImage(imageurl, holder.image);
return rowView;
}
/**
* Implementing the Filterable interface.
*/
public Filter getFilter() {
if (filter == null) {
filter = new FBAdapterFilter();
}
return filter;
}
/**
* Custom Filter implementation for the items adapter.
*
*/
private class FBAdapterFilter extends Filter {
protected FilterResults performFiltering(CharSequence prefix) {
// Initiate our results object
FilterResults results = new FilterResults();
// No prefix is sent to filter by so we're going to send back the
// original array
if (prefix == null || prefix.length() == 0) {
synchronized (mLock) {
results.values = originalItems;
results.count = originalItems.size();
}
} else {
synchronized (mLock) {
// Compare lower case strings
String prefixString = prefix.toString().toLowerCase();
final ArrayList<FacebookUser> filteredItems = new ArrayList<FacebookUser>();
// Local to here so we're not changing actual array
final ArrayList<FacebookUser> localItems = new ArrayList<FacebookUser>();
localItems.addAll(originalItems);
final int count = localItems.size();
for (int i = 0; i < count; i++) {
final FacebookUser item = localItems.get(i);
final String itemName = item.getName().toString()
.toLowerCase();
// First match against the whole, non-splitted value
if (itemName.startsWith(prefixString)) {
filteredItems.add(item);
} else {
} /*
* This is option and taken from the source of
* ArrayAdapter final String[] words =
* itemName.split(" "); final int wordCount =
* words.length;
*
* for (int k = 0; k < wordCount; k++) { if
* (words[k].startsWith(prefixString)) {
* newItems.add(item); break; } } }
*/
}
// Set and return
results.values = filteredItems;
results.count = filteredItems.size();
}// end synchronized
}
return results;
}
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence prefix, FilterResults results) {
// noinspection unchecked
synchronized (mLock) {
final ArrayList<FacebookUser> localItems = (ArrayList<FacebookUser>) results.values;
notifyDataSetChanged();
clear();
// Add the items back in
for (Iterator iterator = localItems.iterator(); iterator
.hasNext();) {
FacebookUser gi = (FacebookUser) iterator.next();
add(gi);
}
}// end synchronized
}
}
public ArrayList<FacebookUser> getSelectedItems() {
ArrayList<FacebookUser> result = new ArrayList<FacebookUser>();
for (FacebookUser friend : items) {
if (friend.isSelected())
result.add(friend);
}
return result;
}
}
在AsyncTask的
我也装Facebook上的朋友，所以我改变了这种方式，以便适配器在postExecute填充：
I also loaded facebook friends on AsyncTask so I changed that way so adapter is populated in postExecute:
@Override
protected void onPostExecute(ArrayList<FacebookUser> result) {
if (result != null && result.size() > 0) {
facebookAdapter = new FBAdapter(
InviteFriendsFromFacebookActivity.this,
R.layout.facebook_friendslist_row, result);
facebookListView.setAdapter(facebookAdapter);
facebookListView.setVisibility(View.VISIBLE);
facebookAdapter.notifyDataSetChanged();
}
}
现在这个问题已经一去不复返了。谢谢
Now the issue is gone. Thanks
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