我们经常会在Windows开发的过程中看到一个下拉菜单控件，在Android中也有相应的控件，它的名字叫Spinner，本文介绍Spinner的用法。
首先，下面的这张截图是实现的实例：
在第一行，你会看到一行说明“This is just Test！”，这个类似于标题，它的定义方法是spinner.setPrompt("This is just Test!");
下面的数据是引用资源，使用的是string数组，让我们来看下数组的定义：
<string-array name="planets_array"> <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>当用户点击选择Spinner的下拉选项时，会弹出相应的Toast说明，这就需要实现相应的监听功能
下面给出本程序的源代码：
public class Spinner_Activiy extends Activity { private Spinner spinner=null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_spinner__activiy); Spinner spinner = (Spinner) findViewById(R.id.planets_spinner); // Create an ArrayAdapter using the string array and a default spinner layout ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.planets_array, android.R.layout.simple_spinner_item); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); spinner.setPrompt("This is just Test!"); spinner.setOnItemSelectedListener(new SpinnerActivity()); } public class SpinnerActivity implements OnItemSelectedListener { public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) { // An item was selected. You can retrieve the selected item using // parent.getItemAtPosition(pos) Toast.makeText(Spinner_Activiy.this, "Your selection is "+parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show(); } public void onNothingSelected(AdapterView<?> parent) { // Another interface callback } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_spinner__activiy, menu); return true; }}再分享一下我老师大神的人工智能教程吧。零基础！通俗易懂！风趣幽默！还带黄段子！希望你也加入到我们人工智能的队伍中来！https://blog.csdn.net/jiangjunshow