ArrayAdapter的机器人，add（）函数不工作 [英] Android, add() function of ArrayAdapter not working

问题描述

我有连接到AutoCompleteTextView（TextView的）组件ArrayAdapter（myAdapter）。
一旦用户presses一个角色，我想填充AutoCompleteTextView的下拉列表中包含这个角色的物品。
我检索使用的AsyncTask（使用Web服务）的项目。

I have an ArrayAdapter (myAdapter) attached to an AutoCompleteTextView (textView) component.
Once the user presses a character I would like to populate AutoCompleteTextView's drop down list with items containing this character.
I retrieve the items using AsyncTask (which uses a web service).

我叫myAdapter.add（项目），但是下拉列表是空的。照片 我添加了一个电话myAdapter.getCount（）每次加入后，它显示了零每次。 调用notifyDataSetChanged（）并没有帮助。
我甚至尝试添加，而不是我的自定义对象的简单的String对象，都无济于事。
我究竟做错了什么？

I call myAdapter.add(item) but the drop down list is empty.
I added a call myAdapter.getCount() after each addition and it shows zero every time. Calling notifyDataSetChanged() didn't help.
I even tried to add simple String objects instead of my custom objects, to no avail.
What am I doing wrong?

编辑：我改变了code以下，但仍miette建议无济于事
。 一般情况下，后文是我的自动完成文本视图改变什么，我做的是，我所说的新的AsyncTask，并通过它输入的文本和处理程序（见afterTextChanged（））。任务检索相关的文本对象，一旦做了处理程序的handleMessage（）函数被调用。在handleMessage（）函数我试图填充适配器的对象。不过还是适配器的下拉列表中结束了空。

I changed the code as miette suggested below but still to no avail.
Generally, what I do is after text is changed in my auto complete text view, I call a new AsyncTask and pass it the entered text and a Handler (see afterTextChanged()). The task retrieves objects relevant to the text and once done the Handler's handleMessage() is called. In handleMessage() I attempt to populate the adapter's objects. But still the adapter's drop down list ends up empty.

下面是我的code：

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 a1, int a2, 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，罗布

Thanks a lot, Rob

推荐答案

你在哪里调用addItemsToAdapter（）？ 你能告诉我们，你如何试图简单的字符串添加到您的适配器？

Where do you call addItemsToAdapter()? Can you show us, how you have tried to add simple Strings to your Adapter?

编辑：出意见的有益code样品：<​​/ P>

out of the comments the helpful code sample:

adapter = new ArrayAdapter<Stock>(this, android.R.layout.simple_dropdown_item_1line, stocks);
adapter.notifyDataSetChanged();
textView.setAdapter(adapter);

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