相关疑难解决方法(0)

我想过滤一个SimpleCursorAdapter驱动的ListView,它上面有一个EditText框.我有以下代码,但当我输入框时,没有任何反应; 完整列表继续显示.我究竟做错了什么？

    mCursor = getDirectoryList(null);

    adapter = new SimpleCursorAdapter(this,
            R.layout.directory_people_item, mCursor,
            new String[]{
                directoryPeople.LAST_NAME,
                directoryPeople.FIRST_NAME,
                directoryPeople.MIDDLE_NAME,
                directoryPeople.JOB_TITLE},
            new int[]{
                R.id.txtLastName,
                R.id.txtFirstName,
                R.id.txtMiddle,
                R.id.txtTitle} 
    ); 

    ListView av = (ListView)findViewById(R.id.listPeople);
    av.setAdapter(adapter);
    av.setFastScrollEnabled(true);
    av.setTextFilterEnabled(true);

    EditText etext=(EditText)findViewById(R.id.search_box);
    etext.addTextChangedListener(new TextWatcher() {
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        public void afterTextChanged(Editable s) {
            ListView av = (ListView)findViewById(R.id.listPeople);
            SimpleCursorAdapter filterAdapter = (SimpleCursorAdapter)av.getAdapter();
            filterAdapter.getFilter().filter(s.toString());
        }
    });

    adapter.setFilterQueryProvider(new FilterQueryProvider() {
        public …