动态向spinner添加数据但不更新微调器上的数据

Question

 public class testAddSpiner extends Activity {
private Spinner m_myDynamicSpinner;
private EditText m_addItemText;
private ArrayAdapter<CharSequence> m_adapterForSpinner;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    m_myDynamicSpinner = (Spinner)findViewById(R.id.dynamicSpinner);        
    m_addItemText = (EditText)findViewById(R.id.newSpinnerItemText);
    Button addButton = (Button)findViewById(R.id.AddBtn);
    Button clearButton = (Button)findViewById(R.id.ClearBtn);


    m_adapterForSpinner = new ArrayAdapter(this, android.R.layout.simple_spinner_item);
    m_adapterForSpinner.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);        
    m_myDynamicSpinner.setAdapter(m_adapterForSpinner);
    m_adapterForSpinner.add("gr");        


    addButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {               
            addNewSpinnerItem();
        }                   
    });


    clearButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {
            clearSpinnerItems();
        }           
    });  
}

private void addNewSpinnerItem() {
    CharSequence textHolder = "" + m_addItemText.getText();
    m_adapterForSpinner.add(textHolder);

}

private void clearSpinnerItems() {
    m_adapterForSpinner.clear();
    m_adapterForSpinner.add("dummy item");
}       

 }

我的微调器m_adapterForSpinner更新非常好，如果我从m_adapterForSpinner中选择一个，它可以在spinner上显示。我想做的是我添加一个数据，它不仅显示在m_adapterForSpinner上，还显示在微调器上。

Answer 1

您是否尝试过选择第一项？ spinner.setSelection(0);？

Answer 2

addButton.setOnClickListener(new OnClickListener(){

        @Override
        public void onClick(View v) {               
            addNewSpinnerItem();
          int a=  m_adapterForSpinner.getCount();
            m_myDynamicSpinner.setSelection(a-1);

           // m_adapterForSpinner.notifyDataSetChanged();
        }                   
    });

Answer 3

尝试在向适配器添加项目后调用notifyDataSetChanged（）：

private void addNewSpinnerItem() {
    CharSequence textHolder = "" + m_addItemText.getText();
    m_adapterForSpinner.add(textHolder);
    m_adapterForSpinner.notifyDataSetChanged();

}