对此，我找到了很多好的解决方案。大多数是通过在适配器的末尾添加一个项来工作的，并且不在下拉列表中显示最后一个项。 对我来说最大的问题是旋转器下拉列表将从列表的底部开始。所以用户看到的最后一个项目，而不是第一个项目(在情况下有许多项目显示)，触摸转轮后，第一次。

所以我把提示项放在列表的开头。并在下拉列表中隐藏第一项。

private void loadSpinner(){

    HintArrayAdapter hintAdapter = new HintArrayAdapter<String>(context, 0);

    hintAdapter.add("Hint to be displayed");
    hintAdapter.add("Item 1");
    hintAdapter.add("Item 2");
            .
            .
    hintAdapter.add("Item 30");

    spinner1.setAdapter(hintAdapter);

    //spinner1.setSelection(0); //display hint. Actually you can ignore it, because the default is already 0
    //spinner1.setSelection(0, false); //use this if don't want to onItemClick called for the hint

    spinner1.setOnItemSelectedListener(yourListener);
}

private class HintArrayAdapter<T> extends ArrayAdapter<T> {

    Context mContext;

    public HintArrayAdapter(Context context, int resource) {
        super(context, resource);
        this.mContext = context
    }

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(android.R.layout.simple_spinner_item, parent, false);
        TextView texview = (TextView) view.findViewById(android.R.id.text1);

        if(position == 0) {
            texview.setText("");
            texview.setHint(getItem(position).toString()); //"Hint to be displayed"
        } else {
            texview.setText(getItem(position).toString());
        }

        return view;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
        View view;

        if(position == 0){
            view = inflater.inflate(R.layout.spinner_hint_list_item_layout, parent, false); // Hide first row
        } else {
            view = inflater.inflate(android.R.layout.simple_spinner_dropdown_item, parent, false);
            TextView texview = (TextView) view.findViewById(android.R.id.text1);
            texview.setText(getItem(position).toString());
        } 

        return view;
    }
}

在@Override getDropDownView()中设置下面的布局，当position为0时，隐藏第一个提示行。

R.layout.spinner_hint_list_item_layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

</LinearLayout>

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!

我得到了同样的问题旋转，与一个空的选择，我找到了一个更好的解决方案。看看这段简单的代码。

Spinner lCreditOrDebit = (Spinner)lCardPayView.findViewById(R.id.CARD_TYPE);
spinneradapter lAdapter = 
  new spinneradapter(
    BillPayScreen.this, 
    ndroid.R.layout.simple_spinner_item,getResources().getStringArray(R.array.creditordebit));
lAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
lCreditOrDebit.setAdapter(lAdapter);

这里spinneradapter是对arrayadapter的一个小定制。它是这样的:

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;

public class spinneradapter extends ArrayAdapter<String>{
    private Context m_cContext;
    public spinneradapter(Context context,int textViewResourceId, String[] objects) {
        super(context, textViewResourceId, objects);
        this.m_cContext = context;
    }

    boolean firsttime = true;
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if(firsttime){
            firsttime = false;
            //Just return some empty view
            return new ImageView(m_cContext);
        }
        //Let the array adapter take care of it this time.
        return super.getView(position, convertView, parent);
    }
}

此代码已经过测试，在Android 4.4上工作

Spinner spinner = (Spinner) activity.findViewById(R.id.spinner);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(activity, android.R.layout.simple_spinner_dropdown_item) {

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {

                View v = super.getView(position, convertView, parent);
                if (position == getCount()) {
                    ((TextView)v.findViewById(android.R.id.text1)).setText("");
                    ((TextView)v.findViewById(android.R.id.text1)).setHint(getItem(getCount())); //"Hint to be displayed"
                }

                return v;
            }       

            @Override
            public int getCount() {
                return super.getCount()-1; // you dont display last item. It is used as hint.
            }

        };

        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        adapter.add("Daily");
        adapter.add("Two Days");
        adapter.add("Weekly");
        adapter.add("Monthly");
        adapter.add("Three Months");
        adapter.add("HINT_TEXT_HERE"); //This is the text that will be displayed as hint.


        spinner.setAdapter(adapter);
        spinner.setSelection(adapter.getCount()); //set the hint the default selection so it appears on launch.
        spinner.setOnItemSelectedListener(this);

When extending SpinnerAdapter, you override two View-producing methods, getView(int, View, ViewGroup) and getDropDownView(int, View, ViewGroup). The first one supplies the View inserted into the Spinner itself; the second supplies the View in the drop-down list (as the name suggests). You can override the getView(...) so that, until an item has been selected, it displays a TextView containing a prompt; then, when you detect an item has been selected, you change it to display a TextView corresponding to that.

public class PromptingAdapter extends SpinnerAdapter {

    //... various code ...

    private boolean selectionmade = false;

    //call this method from the OnItemSelectedListener for your Spinner
    public setSelectionState(boolean b) {
        selectionmade = b;
    }

    @Override
    public View getView(int position, View recycle, ViewGroup container) {
        if(selectionmade) {
            //your existing code to supply a View for the Spinner
            //you could even put "return getDropDownView(position, recycle, container);"
        }
        else {
            View output;
            if(recycle instanceof TextView) {
                 output = recycle;
            }
            else {
                 output = new TextView();
                 //and layout stuff
            }
            output.setText(R.string.please_select_one);
            //put a string "please_select_one" in res/values/strings.xml
            return output;
        }
    }

//...
}

这是我最后一个“all in”按钮旋转器的例子

在activity_my_form.xml

    <Button
        android:id="@+id/btnSpinnerPlanets"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="left|center_vertical"
        android:singleLine="true"
        android:text="@string/selectAPlanet"
        android:textSize="10sp"
        android:background="@android:drawable/btn_dropdown">
    </Button>

在strings.xml

<string name="selectAPlanet">Select planet&#8230;</string>

<string-array name="planets__entries">
    <item>The Sun with a name very long so long long long long longThe Sun with a name very long so long long long long longThe Sun with a name very long so long long long long long</item>
    <item>Mercury</item>
    <item>Venus</item>
    <item>Earth</item>
    <item>Mars</item>
    <item>Jupiter</item>
    <item>Saturn</item>
    <item>Uranus</item>
    <item>Neptune</item>
</string-array>

在MyFormActivity.java

public class MyFormActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        ((Button) findViewById(R.id.btnSpinnerPlanets)).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final String[] items = view.getResources().getStringArray(R.array.planets__entries);
                ArrayAdapter<String> adapter = new ArrayAdapter<String>(MyFormActivity.this, android.R.layout.simple_spinner_dropdown_item, items);
                new AlertDialog.Builder(MyFormActivity.this).setTitle("the prompt").setAdapter(adapter, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ((Button) findViewById(R.id.btnSpinnerPlanets)).setText(items[which]);
                        dialog.dismiss();
                    }
                }).create().show();
            }
        });     

    }

}   

最后我获得了一个字体大小可配置无第一项可选择的按钮旋转器!! 感谢HRJ