android – 如何设置当前微调文本而不更改关联的选择列表项

| Monday       | 
| Thuesday     |
| Wednesday    |
| Thursday     |
| Friday       |
| Saturday     |
| USER DEFINED |

实现这一点的关键细节是Spinner使用的 SpinnerAdapter界面有两种不同但相关的方法：

> getView() – 创建Spinner本身显示的视图.
> getDropDownView() – 创建下拉弹出窗口中显示的视图.

因此,要使一个在弹出窗口本身不同弹出窗口中显示的项目,您只需要以不同的方式实现这两种方法.根据您的代码的细节,细节可能会有所不同,但一个简单的例子就是：

public class AdapterWithCustomItem extends ArrayAdapter<String>
{
    private final static int position_user_DEFINED = 6;
    private final static String[] OPTIONS = new String[] {
        "Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Custom..." };

    private String mCustomText = "";

    public AdapterWithCustomItem(Context context){
        super(context,android.R.layout.simple_spinner_dropdown_item,OPTIONS);
    }

    @Override
    public View getView(int position,View convertView,ViewGroup parent) {
        View view = super.getView(position,convertView,parent);
        if (position == POSITION_user_DEFINED) {
            TextView tv = (TextView)view.findViewById(android.R.id.text1);
            tv.setText(mCustomText);
        }

        return view;
    }

    public void setCustomText(String customText) {
        // Call to set the text that must be shown in the spinner for the custom option.
        mCustomText = customText;
        notifyDataSetChanged();
    }

    @Override
    public View getDropDownView(int position,ViewGroup parent) {
        // No need for this override,actually. It's just to clarify the difference.
        return super.getDropDownView(position,parent);
    }
}

然后,当用户输入自定义值时,您只需要使用要显示的文本调用适配器上的setCustomText()方法即可.

@H_912_2@mAdapter.setCustomText("This is displayed for the custom option");

产生以下结果：

由于您只是覆盖了getView()方法,所以下拉列表仍然显示与选项本身中定义的文本相同的文本.