Spinner的功能和用法

Gallery和Spinner的共同父类是： AbsSpinner。他们都是列表框，区别有二：

1、Spinner显示的是垂直的列表框，而Gallery显示的是水平的列表框；

2、Spinner的作用是供用户选择，Gallery是用户拖动来查看上一个下一个列表项；

举个例子来分别说明Spinner的用法；Galler是不推荐的控件！

sample1(Spinner):

activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.hct.spinner.MainActivity" >

<Spinner
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:entries="@array/books" />

<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java：

public class MainActivity extends Activity {

private Spinner m_spinner;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
m_spinner = (Spinner) findViewById(R.id.spinner);
String[] arr = new String[] { "孙悟空", "猪八戒", "唐僧" };

ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice, arr);
m_spinner.setAdapter(adapter);
}

@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;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}