范例HelloSpinner
Android docs中的范例，简单翻译整理如下。注：范例过程及相关代码有部分调整，请知晓。
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1、创建新项目，名称HelloSpinner；
2、修改res/layout/strings.xml，内容如下：
<?xml version="1.0" encoding="utf-8"?><resources> <string name="planet_prompt">Choose a planet</string> <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></resources>
3、修改res/layout/main.xml，内容如下：
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:padding="10dip" android:layout_width="fill_parent" android:layout_height="wrap_content"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginTop="10dip" android:text="@string/planet_prompt" /> <Spinner android:id="@+id/spinner" android:layout_width="fill_parent" android:layout_height="wrap_content" android:prompt="@string/planet_prompt" /></LinearLayout>
3、增加类MyOnItemSelectedListener.java，类代码如下：
public class MyOnItemSelectedListener implements OnItemSelectedListener {public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {Toast.makeText(parent.getContext(), "The planet is " + parent.getItemAtPosition(pos).toString(),Toast.LENGTH_LONG).show();}public void onNothingSelected(AdapterView<?> parent) {// Do nothing.}}
4、修改HelloSpinner.java的onCreate方法，内容如下：
public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);Spinner spinner = (Spinner) findViewById(R.id.spinner);ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.planets_array,android.R.layout.simple_spinner_item);adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);spinner.setAdapter(adapter);spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());}
5、运行项目，即可看到运行效果，如下图所示：
http://dl.iteye.com/upload/attachment/424658/683e8901-1b38-37a6-9565-320ec52e65aa.png
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