我已经从this tutorial实现了一个CustomArrayAdapter，以便为列表视图的每个条目添加一个缩略图和2行。除了过滤之外，它的工作原理完美。我一直在尝试在this，this和this问题后实施过滤， 但列表视图永远不会更新。
这是我的多行布局代码：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip">
<ImageView
android:id="@+id/thumb"
android:background="@drawable/thumb"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_marginRight="6dip"
android:layout_marginTop="2dip"
android:layout_marginBottom="2dip"/>
<LinearLayout
android:orientation="vertical"
android:layout_width="0dip"
android:layout_weight="1"
android:layout_height="fill_parent">
<TextView
android:id="@+id/custom_title"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:textColor="@color/black"
android:gravity="center_vertical"
/>
<TextView
android:id="@+id/desc"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
android:textColor="@color/darkgray"
android:textStyle="italic"
android:singleLine="true"
android:ellipsize="marquee"
/>
</LinearLayout>
这是我的customListAdapter的代码（在first link之后）
public class CustomListAdapter extends ArrayAdapter implements Filterable{
private static ArrayList<CustomListItem> searchArrayList;
private static ArrayList<CustomListItem> subItems;
private PTypeFilter filter;
private LayoutInflater mInflater;
public CustomListAdapter(Context context, int textViewResourceId, ArrayList<CustomListItem> results) {
super(context,textViewResourceId, results);
searchArrayList = results;
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return searchArrayList.size();
}
public Object getItem(int position) {
return searchArrayList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.custom_row, null);
holder = new ViewHolder();
holder.txtTitle = (TextView) convertView.findViewById(R.id.custom_title);
holder.txtDesc = (TextView) convertView.findViewById(R.id.desc);
holder.thumb = (ImageView) convertView.findViewById(R.id.thumb);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txtTitle.setText(searchArrayList.get(position).getTitle());
holder.txtDesc.setText(searchArrayList.get(position).getDesc());
holder.thumb.setImageBitmap(searchArrayList.get(position).getThumb());
//holder.thumb.setBackgroundColor(Color.BLACK);
return convertView;
}
static class ViewHolder {
TextView txtTitle;
TextView txtDesc;
ImageView thumb;
}
@Override
public Filter getFilter() {
Log.i("CustomListAdapter", "testing filter");
if (filter == null){
filter = new PTypeFilter();
}
return filter;
}
private class PTypeFilter extends Filter{
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence prefix,
FilterResults results) {
// NOTE: this function is *always* called from the UI thread.
subItems = (ArrayList<CustomListItem>)results.values;
notifyDataSetChanged();
}
@SuppressWarnings("unchecked")
protected FilterResults performFiltering(CharSequence prefix) {
// NOTE: this function is *always* called from a background thread, and
// not the UI thread.
FilterResults results = new FilterResults();
ArrayList<CustomListItem> i = new ArrayList<CustomListItem>();
if (prefix!= null && prefix.toString().length() > 0) {
for (int index = 0; index < searchArrayList.size(); index++) {
CustomListItem si = searchArrayList.get(index);
if(si.toString().compareTo(prefix.toString()) == 0){
i.add(si);
}
}
results.values = i;
results.count = i.size();
}
else{
synchronized (searchArrayList){
results.values = searchArrayList;
results.count = searchArrayList.size();
}
}
return results;
}
}
}
从我的主要活动中，我称之为自定义基础适配器：
adapter = new CustomListAdapter(this, R.id.custom_title, DATA);
setListAdapter(adapter);
（不是100％确定R.id.custom_title是我应该放在那里的身份。
我添加了调试消息，并且正在调用TextChange作为getFilter（）方法。 所以我不知道我做错了什么。在我从ListAdapter切换到CustomListAdapter之前，过滤工作正常：（
谢谢你的帮助
答案 0 :(得分：2)
ListView未过滤，因为您在subItems上设置了过滤器的结果，但未在适配器类中使用，因此对notifyDataSetChanged的调用将不起作用适配器的观点数据是完整的。你使用另一个列表保存旧值是正确的，它们将是必需的，因此你可以拥有所有旧值。要解决问题，请添加以下行：
subItems = new ArrayList<CustomListItem>(searchArrayList);
在适配器的构造函数中，这样您就可以获得稍后要使用的完整值的副本。然后在publishResults方法中使用searchArrayList列表，因为这是支持适配器的列表：
searchArrayList = (ArrayList<CustomListItem>)results.values;
notifyDataSetChanged();
然后在performFiltering方法中：
if (prefix!= null && prefix.toString().length() > 0) {
// use the initial values !!!
for (int index = 0; index < subItems.size(); index++) {
CustomListItem si = subItems.get(index);
final int length = prefix.length();
// if you compare the Strings like you did it will never work as you compare the full item string(you'll have a match only when you write the EXACT word)
// keep in mind that you take in consideration capital letters!
if(si.toString().substring(0, prefixLength).compareTo(prefix.toString()) == 0){
i.add(si);
}
}
results.values = i;
results.count = i.size();
}
else{
// revert to the old values
synchronized (searchArrayList){
results.values = subItems;
results.count = subItems.size();
}
}
我希望它有效。
（不是100％确定R.id.custom_title是我应该放的ID 那里。
使用自己的自定义适配器无关紧要。