2.实现显示时默认选中项控制.

4.数据库处理使用AHibernate1.1,详见: http://blog.csdn.net/lk_blog/article/details/8201449 

android使用Dialog实现复选功能与数据库结合综合实例见下篇博客: http://blog.csdn.net/lk_blog/article/details/8515403 

本示例效果图:

主要代码:spinner.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="修改学生[李坤]所在班级" />

    <Spinner
        android:id="@+id/sprClass"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    
    <Button
        android:id="@+id/btnSave"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="保存"/>

</LinearLayout>

package com.tgb.lk.demo;

import java.util.List;

import com.tgb.lk.demo.R;
import com.tgb.lk.demo.dao.impl.ClassesDaoImpl;
import com.tgb.lk.demo.dao.impl.StudentDaoImpl;
import com.tgb.lk.demo.model.Student;
import com.tgb.lk.demo.util.CItem;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class SpinnerActivity extends Activity {
	private Spinner sprClass;
	private Button btnSave;

	private ClassesDaoImpl clsDao;
	private StudentDaoImpl stuDao;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.spinner);
		clsDao = (clsDao == null ? new ClassesDaoImpl(this) : clsDao);
		stuDao = (stuDao == null ? new StudentDaoImpl(this) : stuDao);

		sprClass = (Spinner) findViewById(R.id.sprClass);
		btnSave = (Button) findViewById(R.id.btnSave);
		btnSave.setOnClickListener(listener);

		List<CItem> items = clsDao.getCItemClasses();
		sprClass.setAdapter(buildSpinnerAdpater(this, items));
		sprClass.setPrompt("请选择");
		// 这个演示示例修改的学号为1的学生的信息,初始化数据中学号1没有自动生成主键,实际项目中可以根据查询的结果来传入id.
		int classesId = stuDao.get(1).getClassesId();
		setSpinnerInitId(sprClass, classesId, items);// 设置Spinner默认的选中项
	}

	// 得到spinner的选中的Id
	public int getSpinnerSelectId(Spinner spinner) {
		CItem item = (CItem) spinner.getSelectedItem();
		if (item != null) {
			return Integer.parseInt(item.getId());
		}
		return 0;
	}

	// 设置Spinner打开时默认的选中项
	public void setSpinnerInitId(Spinner spinner, int initId, List<CItem> items) {
		// 初始化默认选项
		if (initId != 0) {
			String id = String.valueOf(initId);
			for (int i = 0; i < items.size(); i++) {
				i