我试过的方法如下。取一个按钮并将单击事件赋予它。通过改变按钮背景，它似乎是一个旋转器。

声明为全局变量alertdialog和默认值..

AlertDialog d;
static int default_value = 0;
final Button btn = (Button) findViewById(R.id.button1);
btn .setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v)
{
    //c.show();
    final CharSequence str[] = {"Android","Black Berry","Iphone"};
        AlertDialog.Builder builder =
          new AlertDialog.Builder(TestGalleryActivity.this).setSingleChoiceItems(
            str, default_value,new  DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int position)
            {
                Toast.makeText(TestGalleryActivity.this,
                               "" + position,
                               Toast.LENGTH_SHORT).show();
                default_value = position;
                btn.setText(str[position]);
                if(d.isShowing())
                    d.dismiss();
            }
        }).setTitle("Select Any");
        d = builder.create();
        d.show();
    }
});

String[] listAges = getResources().getStringArray(R.array.ages);

        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter =
                new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, listAges);

        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

        // attaching data adapter to spinner
        spinner_age.getBackground().setColorFilter(ContextCompat.getColor(this, R.color.spinner_icon), PorterDuff.Mode.SRC_ATOP);
        spinner_age.setAdapter(dataAdapter);
        spinner_age.setSelection(0);
        spinner_age.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                String item = parent.getItemAtPosition(position).toString();

                if(position > 0){
                    // get spinner value
                    Toast.makeText(parent.getContext(), "Age..." + item, Toast.LENGTH_SHORT).show();
                }else{
                    // show toast select gender
                    Toast.makeText(parent.getContext(), "none" + item, Toast.LENGTH_SHORT).show();
                }
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });

 ArrayList<String> sizes = new ArrayList<>();

 spinner = (Spinner) findViewById(R.id.spinner_size);

    if (sizes != null && !sizes.isEmpty()) {

        //SORT ArrayList If You Want Data in ASC or DSC Order

        sizes.add("28");
        sizes.add("29");
        sizes.add("31");

        sizes.add("Choose Size"); //adding String at the end of ArrayList
        Collections.reverse(sizes); //Last Item Will Be Shown As A Spinner Title

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, sizes);
        spinner.setAdapter(adapter);

简单地使用数组列表。add("Your Data")方法在数组列表的末尾添加项，然后使用Collection.reverse(arrayList)反转它，以便标题是Spinner中的第一个项。还可以在最后添加数据之前对项目进行排序。

之前提交的答案都没有真正按照我想要的方式解决这个问题。对我来说，理想的解决方案是在旋转器第一次显示时提供“Select One”(或任何初始文本)。当用户点击转轮时，初始文本不应该是显示的下拉框的一部分。

为了使我的特定情况更加复杂，我的旋转器数据来自通过LoaderManager回调加载的游标。

经过大量的实验，我想出了以下解决方案:

public class MyFragment extends Fragment implements
LoaderManager.LoaderCallbacks<Cursor>{

private static final String SPINNER_INIT_VALUE = "Select A Widget";
private Spinner mSpinner;
private int mSpinnerPosition;
private boolean mSpinnerDropDownShowing = false;
private View mSpinnerDropDown;

private MyCursorAdapter mCursorAdapter;

...

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
...

mCursorAdapter = new MyCursorAdapter(getActivity());

mSpinner = (Spinner) rootView.findViewById(R.id.theSpinner);
mSpinner.setOnTouchListener(mSpinnerTouchListener);
mSpinner.setAdapter(mCursorAdapter);

...
}

//Capture the touch events to toggle the spinner's dropdown visibility
private OnTouchListener mSpinnerTouchListener = new View.OnTouchListener() {
    @Override
    public boolean onTouch(View view, MotionEvent motionEvent) {
        if(mSpinnerDropDown != null && mSpinnerDropDownShowing == false){
            mSpinnerDropDownShowing = true;
            mSpinnerDropDown.setVisibility(View.VISIBLE);
        }
        return false;
    }
};

//Capture the click event on the spinner drop down items
protected OnClickListener spinnerItemClick = new OnClickListener(){

    @Override
    public void onClick(View view) {
        String widget = ((TextView) view.findViewById(android.R.id.text1)).getText().toString();

        if(!widget.equals(SPINNER_INIT_VALUE)){
            if(mCursorAdapter != null){
                Cursor cursor = mCursorAdapter.getCursor();
                if(cursor.moveToFirst()){
                    while(!cursor.isAfterLast()){
                        if(widget.equals(cursor.getString(WidgetQuery.WIDGET_NAME))){

                            ...

                            //Set the spinner to the correct item
                            mSpinnerPosition = cursor.getPosition() + 1;
                            mSpinner.setSelection(mSpinnerPosition);
                            break;
                        }
                        cursor.moveToNext();
                    }
                }
            }
        }

        //Hide the drop down. Not the most elegent solution but it is the only way I could hide/dismiss the drop down
        mSpinnerDropDown = view.getRootView();
        mSpinnerDropDownShowing = false;
        mSpinnerDropDown.setVisibility(View.GONE);
    }
};

private class MyCursorAdapter extends CursorAdapter {

    private final int DISPLACEMENT = 1;
    private final int DEFAULT_ITEM_ID = Integer.MAX_VALUE;

    private Activity mActivity;

    public MyCursorAdapter(Activity activity) {
            super(activity, null, false);
            mActivity = activity;
    }

    //When loading the regular views, inject the defualt item
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(position == 0){
            if(convertView == null){
                convertView = mActivity.getLayoutInflater().inflate(R.layout.list_item_widget, parent, false);
            }
            return getDefaultItem(convertView);
        }
        return super.getView(position - DISPLACEMENT, convertView, parent);
    }

    //When loading the drop down views, set the onClickListener for each view
    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent){
        View view = super.getDropDownView(position, convertView, parent);
        view.setOnClickListener(spinnerItemClick);
        return view;
    }

    //The special default item that is being injected
    private View getDefaultItem(View convertView){
        TextView text = (TextView) convertView.findViewById(android.R.id.text1);
        text.setText(SPINNER_INIT_VALUE);
        return convertView;
    }

    @Override
    public long getItemId(int position) {
        if (position == 0) {
            return DEFAULT_ITEM_ID;
        }
        return super.getItemId(position - DISPLACEMENT);
    }

    @Override
    public boolean isEnabled(int position) {
        return position == 0 ? true : super.isEnabled(position - DISPLACEMENT);
    }

    @Override
    public int getViewTypeCount() {
        return super.getViewTypeCount() + DISPLACEMENT;
    }

    @Override
    public int getItemViewType(int position) {
        if (position == 0) {
            return super.getViewTypeCount();
        }

        return super.getItemViewType(position - DISPLACEMENT);
    }

    @Override
    public View newView(Context context, Cursor cursor, ViewGroup parent) {
        return mActivity.getLayoutInflater().inflate(R.layout.list_item_widget, parent, false);
    }

    @Override
    public void bindView(View view, Context context, Cursor cursor){

        if(cursor.isAfterLast()){
            return;
        }

        TextView text = (TextView) view.findViewById(android.R.id.text1);
        String WidgetName = cursor.getString(WidgetQuery.WIDGET_NAME);
        text.setText(WidgetName);
    }
}
}

此外，还有一个简单的技巧来显示默认值:

你可以在列表中添加一个默认值，然后使用list. addall (yourCollection)添加所有的集合;

下面是可操作的示例代码:

List<FuelName> fuelList = new ArrayList<FuelName>();
                    fuelList.add(new FuelName(0,"Select One"));
                    fuelList.addAll(response.body());
                    ArrayAdapter adapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_spinner_item, fuelList);
                    //fuelName.setPrompt("Select Fuel");
                    fuelName.setAdapter(adapter);

我最终使用了Button。虽然Button不是旋转器，但其行为很容易自定义。

首先像往常一样创建适配器:

String[] items = new String[] {"One", "Two", "Three"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_spinner_dropdown_item, items);

注意，我使用simple_spinner_dropdown_item作为布局id。这将有助于创建一个更好的外观时，创建警报对话框。

在onClick处理我的按钮，我有:

public void onClick(View w) {
  new AlertDialog.Builder(this)
  .setTitle("the prompt")
  .setAdapter(adapter, new DialogInterface.OnClickListener() {

    @Override
    public void onClick(DialogInterface dialog, int which) {

      // TODO: user specific action

      dialog.dismiss();
    }
  }).create().show();
}

就是这样!