Question

我正在尝试在SimpleAdapter上运行自定义过滤器，似乎在最后一道障碍。在调试代码时，我可以在publishResults方法的itemsFiltered中看到生成的过滤的ArrayList，但始终显示完整的列表。

如何让适配器使用过滤结果列表而不是完整的未过滤列表？

代码是：

private class TextCharFilter extends Filter{

    @Override
    protected FilterResults performFiltering(CharSequence constraint) {

        // convert search string to lower case - the filtering is not case sensitive
        constraint = constraint.toString().toLowerCase();

        // define the result object
        FilterResults result = new FilterResults();
        // define a place to hole the items that pass filtering         
        List<HashMap<String, String>> filteredItems = new ArrayList<HashMap<String,String>>();

        // loop through the original list and any items that pass filtering are added to the "filtered" list
        if(constraint != null && constraint.toString().length() > 0) {

            for(int i = 0; i < items.size(); i++) {
                HashMap<String, String> tmp = items.get(i);
                String candidate = tmp.get("PT").toLowerCase();

                if(candidate.contains(constraint) ) {
                    filteredItems.add(tmp);
                }
            }

            // set the result to the "filtered" list.
            result.count = filteredItems.size();
            result.values = filteredItems;

        }    
        else
        {
            // if nothing to filter on -  then the result is the complete input set
            synchronized(this)
            {
             result.values = items;
             result.count = items.size();
            }
        }
        return result;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected void publishResults(CharSequence constraint, FilterResults results) {

        ArrayList<HashMap<String, String>> tmp = (ArrayList<HashMap<String, String>>)results.values;

        itemsFiltered = new ArrayList<HashMap<String,String>>();

        for (int i = 0; i < tmp.size(); i++){
            itemsFiltered.add(tmp.get(i));
        }

        notifyDataSetChanged();

        notifyDataSetInvalidated();
    }

}

Answer 1

看起来您正在向在publishResults（）中创建的arraylist中添加项目。这些项永远不会添加到实际的适配器中。你应该在publishResults（）中清除适配器，然后重新添加项目。或者只是从过滤器列表中创建一个新的适配器，并将其设置为listview的适配器。

Answer 2

我遇到了同样的问题。

此代码适用于我。

protected void publishResults(CharSequence constraint, FilterResults results) {
        arrayList.clear();
        arrayList.addAll((Collection<? extends HashMap<String, String>>) results.values);
        if (results.count > 0) {
            notifyDataSetChanged();
        } else {
            notifyDataSetInvalidated();
        }       
}

SimpleAdapter自定义过滤器

2 个答案: