android - 错误 : The method getFilter() is undefined for the type FriendsActivity. ListAdapter

Question

尝试在搜索中遇到问题的 ListView 中实现搜索功能，这里我将代码放在出现错误的地方

 friendsearch.addTextChangedListener(new TextWatcher() {
     public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                    // When user changed the Text
                    FriendsActivity.this.adapter.getFilter().filter(cs);
                    //*in the above line i am getting error.*
       }

         public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub

        }

        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub
        }
    });

Answer 1

似乎 FriendsActivity.this.adapter 的类型是 ListAdapter。如果它实际上是数组适配器，那么尝试:

((ArrayAdapter<?>) FriendsActivity.this.adapter).getFilter().filter(cs)

编辑:

您的源代码中有以下类:class ListAdapter extends BaseAdapter。 BaseAdapter 没有实现过滤器。所以你需要手动实现它。查看本教程:http://www.survivingwithandroid.com/2012/10/android-listview-custom-filter-and.html