SPinner

public class MainActivity extends Activity {

private static final String[] bloodType = {"O型","A型","B型","AB型","其他",};
private TextView textView;
private Spinner spinner;
private ArrayAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

textView = (TextView) findViewById(R.id.text);
spinner = (Spinner) findViewById(R.id.spinner);
//將可選內容和ArrayAdapter連接
adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,bloodType);
//將adapter添加到spinner中
spinner.setAdapter(adapter);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
textView.setText("您的血型是"+bloodType[arg2]);
arg0.setVisibility(View.VISIBLE);
}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
//沒有選中
}

});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

XML文件：

<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="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />

<Spinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"/>
</LinearLayout>

}