8
這是我自定義適配器從BaseAdapter繼承:如何使用ListView實現自定義BaseAdapter的過濾器?
public class LocationItemAdapter extends BaseAdapter implements Filterable {
private Activity context;
private String[] names;
private Bitmap[] iconBitmaps;
private String[] categories;
private String[] ratings;
private boolean notifyChanged = true;
public LocationItemAdapter(Activity activityContext, String[] names, Bitmap[] iconBitmaps, String[] categories, String[] ratings) {
super();
this.context = activityContext;
this.names = names;
this.iconBitmaps = iconBitmaps;
this.categories = categories;
this.ratings = ratings;
}
public int getCount() {
return names.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public static class ItemViewHolder {
TextView nameTextView;
TextView categoryTextView;
TextView ratingTextView;
ImageView mapIconImageView;
}
public View getView(int position, View convertView, ViewGroup parent) {
ItemViewHolder holder;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.location_item, null);
holder = new ItemViewHolder();
holder.nameTextView = (TextView) convertView.findViewById(R.id.location_item_xml_textview_name);
holder.categoryTextView = (TextView) convertView.findViewById(R.id.location_item_xml_textview_category);
holder.ratingTextView = (TextView) convertView.findViewById(R.id.location_item_xml_textview_rating);
holder.mapIconImageView = (ImageView) convertView.findViewById(R.id.location_item_xml_imageview_location_icon);
convertView.setTag(holder);
}
else {
holder = (ItemViewHolder) convertView.getTag();
}
holder.nameTextView.setText(names[position]);
holder.categoryTextView.setText(categories[position]);
holder.ratingTextView.setText(ratings[position]);
holder.mapIconImageView.setImageBitmap(iconBitmaps[position]);
return convertView;
}
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
notifyChanged = true;
}
public android.widget.Filter getFilter() {
return new android.widget.Filter() {
@SuppressWarnings("unchecked")
@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
}
@Override
protected FilterResults performFiltering(CharSequence constraint) {
FilterResults results = new FilterResults();
if (constraint != null && constraint.toString() > 0) {
}
else {
}
results.values = filteredResults;
return results;
}
};
}
}
我搜索,發現,我需要實現兩個功能是:
protected void publishResults(CharSequence constraint, FilterResults results)
protected FilterResults performFiltering(CharSequence constraint)
我的過濾器約束是「名稱」字符串數組,我猜performFiltering
會執行基於文本「約束」的搜索。令我困惑的是results.value
的類型是object
。因此,在name
上執行搜索後,我應該將什麼類型的數據分配給results.values
?那功能publishResults
是做什麼的?任何人都可以給我一個關於這兩個函數的例子嗎?在此先感謝,
下面你驗證下面的答案。它對我來說非常合適。 – blganesh101 2013-07-04 17:21:50