Android AutoCompleteTextView作为ListView标头

Question

我正在尝试将AutoCompleteTextView设置为ListView标头,但如果我这样做,则自动完成框永远不会出现.用于创建自动完成视图的代码直接来自googles docs中的Hello,AutoComplete教程.COUNTRIES阵列也来自那里.

protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ListView myList = (ListView) findViewById(R.id.ResultList);

LayoutInflater layoutInflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
TableLayout searchHeader = (TableLayout) layoutInflater.inflate(R.layout.search_header, null); 
myList.addHeaderView(searchHeader, null, false);

final AutoCompleteTextView textView = (AutoCompleteTextView) myList.findViewById(R.id.edit);
ArrayAdapter<String> searchAdapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_dropdown_item_1line, COUNTRIES);
textView.setAdapter(searchAdapter);
textView.setThreshold(1);

        //Dummy data for listview.

String[] listContent = {
        "test", "test", "test", "test",
        "test", "test", "test", "test"
};
ArrayAdapter<String> adapter = new SearchResultAdapter(this, listContent);
myList.setAdapter(adapter);

}

作为测试,我添加了一个TextChangedListener来尝试强制显示对话框

    textView.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
        }

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

        @Override
        public void afterTextChanged(Editable s) {
            textView.showDropDown();
        }
    });

对话框出现但几乎立即关闭.我想知道列表视图中某种事件是否会导致这种情况？

Answer 1

这个问题有关的一个ListView与该AutoCompleteTextView源的一些阅读中的EditText意见重点帮助我找到答案.将ListView上的焦点顺序设置为afterDescendants可以正常显示对话框.

<ListView
    android:id="@+id/ResultList"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_marginBottom="50dip"
    android:descendantFocusability="afterDescendants"
    android:fadingEdge="none" >
</ListView>