我调用myAdapter.add(item),但是下拉列表是空的.
每次添加后,我添加了一个myAdapter.getCount()函数,每次都显示为零.
调用notifyDataSetChanged()没有帮助.
我甚至试图添加简单的String对象而不是我的自定义对象,没有用.
我究竟做错了什么？

编辑：我将代码改为下面提到的miette,但仍然无济于事.
一般来说,我做的是在自动完成文本视图中更改文本后,我调用一个新的AsyncTask并传入输入的文本和处理程序(参见afterTextChanged()).任务检索与文本相关的对象,并且一旦完成了处理程序的handleMessage()被调用.在handleMessage()中,我尝试填充适配器的对象.但是适配器的下拉列表仍然为空.

这是我的代码：

public class AddStockView extends Activity
        implements OnClickListener,OnItemClickListener,TextWatcher {  

    ArrayAdapter<Stock> adapter;
    AutoCompleteTextView textView;
    Vector<Stock> stocks;
    public AddStockView() {
      // TODO Auto-generated constructor stub
      stocks = new Vector<Stock>();
    }

    public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      requestWindowFeature(Window.FEATURE_NO_TITLE); 
      setContentView(R.layout.add_stock_view);

      findViewById(R.id.abort_button).setOnClickListener(this);

      adapter = new ArrayAdapter<Stock>(this,android.R.layout.simple_dropdown_item_1line,stocks);
      //adapter.setNotifyOnChange(true);
      textView = (AutoCompleteTextView)
      findViewById(R.id.search_edit_text);
      textView.setAdapter(adapter);
      textView.setOnItemClickListener(this);
      textView.addTextChangedListener(this);

    }
    @Override
    public void onClick(View v) {
      // TODO Auto-generated method stub
      switch (v.getId())
      {
        case R.id.abort_button:
        finish();
        break;
        case R.id.search_edit_text:

        break;
      }
    }
    @Override
    public void onItemClick(AdapterView<?> parent,View v,int position,long id) {
      // TODO Auto-generated method stub
      Stock stockToAdd = (Stock)parent.getAdapter().getItem(position);
      //TODO: Add the above stock to user's stocks and close this screen
      finish();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {  
      super.onCreateOptionsMenu(menu);  
      getMenuInflater().inflate(R.layout.menu,menu);  

      CategoryMenu.getInstance().populateMenu(menu);
      return true;  
    }  

    @Override  
    public boolean onOptionsItemSelected(MenuItem item) {  
      CategoryMenu.getInstance().menuItemSelected(item,this);
      return false; 
    }  

    @Override  
    public boolean onPrepareOptionsMenu(Menu menu) { 
      return true;  
    }
    @Override
    public void afterTextChanged(Editable text) {
      // TODO Auto-generated method stub
      if (text.toString().equals(""))
        return;
      new AppTask().execute(new AppTask.Payload(Consts.taskType.SEARCH_STOCK,new Object[] {text,handler},this));

    }
    @Override
    public void beforeTextChanged(CharSequence a0,int a1,int a2,int a3) {
      // TODO Auto-generated method stub
    }
    @Override
    public void onTextChanged(CharSequence a0,int a3) {
      // TODO Auto-generated method stub
    }
    private void addStockItemsToAdapter(Vector<Object> dataItems)
    {
      for (int i = 0; i <dataItems.size(); i++)
      {
        Stock stk = (Stock)dataItems.elementAt(i);
        stocks.add(stk);
      }
    }

    public void populateAdapter()
    {
      addStockItemsToAdapter(ContentReader.getInstance.getDataItems());    
      adapter.notifyDataSetChanged();
      int size = adapter.getCount(); // size == 0 STILL!!!!
      textView.showDropDown();
    }
    final Handler handler = new Handler() {
      public void handleMessage(Message msg) {
        populateAdapter();
      }
    };
}

非常感谢Rob