似乎是一个平庸的解决方案，但我通常把简单的TextView在纺纱器的前面。整个Xml是这样的。(嘿，伙计们，别朝我开枪，我知道你们有些人不喜欢这种婚姻):

<FrameLayout
    android:id="@+id/selectTypesLinear"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

    <Spinner
        android:id="@+id/spinnerExercises"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:entries="@array/exercise_spinner_entries"
        android:prompt="@string/exercise_spinner_prompt"
     />                         
    <TextView
        android:id="@+id/spinnerSelectText"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Hey! Select this guy!"
        android:gravity="center"
        android:background="#FF000000" />


</FrameLayout>

然后我隐藏TextView时，一个项目被选中。显然，TextView的背景颜色应该与旋转器相同。适用于Android 4.0。不知道旧版本。

是的。因为Spinner在开始时调用setOnItemSelectedListener，隐藏textview可能有点棘手，但可以这样做:

    Boolean controlTouched;

    exerciseSpinner.setOnTouchListener(new OnTouchListener() {


        @Override
        public boolean onTouch(View v, MotionEvent event) {
            controlTouched = true; // I touched it but but not yet selected an Item.
            return false;
        }

    });
    exerciseSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int arg2, long arg3) {
            if (controlTouched) { // Are you sure that I touched it with my fingers and not someone else  ?
                spinnerSelText.setVisibility(View.GONE);
            }
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
        }

    });

如果你只有三个选择，我只会使用带有RadioButtons的RadioGroup，你可以在一开始让它们都未选中。

我有一个旋转器在我的main.xml和它的id是@+id/spinner1

这是我在OnCreate函数中写的:

spinner1 = (Spinner)this.findViewById(R.id.spinner1);
final String[] groupes = new String[] {"A", "B", "C", "D", "E", "F", "G", "H"};
ArrayAdapter<CharSequence> featuresAdapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, new ArrayList<CharSequence>());
featuresAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(featuresAdapter);
for (String s : groupes) featuresAdapter.add(s);

spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
     public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
         // Here go your instructions when the user chose something
         Toast.makeText(getBaseContext(), groupes[position], 0).show();
     }
     public void onNothingSelected(AdapterView<?> arg0) { }
});

它不需要类中的任何实现。

 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。

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) {
            }
        });

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>