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android使用Dialog实现复选功能与数据库结合综合实例

 
阅读更多
本示例说明:

1.使用Dialog实现复选功能并与后台数据通过Id绑定.

2.实现显示时默认选中项控制.

3.实现修改后保存,根据id保存.

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

单选按钮实例见上篇博客:http://blog.csdn.net/lk_blog/article/details/8515347

本示例效果图:



主要代码:

dialog.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="修改班级[五期提高班]内学生信息" />

    <Button
        android:id="@+id/btnModify"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="修改" />

</LinearLayout>
DialogActivity.java:
package com.tgb.lk.demo;

import java.util.List;

import com.tgb.lk.demo.R;
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.app.AlertDialog;
import android.content.DialogInterface;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class DialogActivity extends Activity {

	private StudentDaoImpl stuDao;
	private Button btnModify;

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

		btnModify = (Button) findViewById(R.id.btnModify);
		btnModify.setOnClickListener(listener);
	}

	private OnClickListener listener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.btnModify:
				stuDao = (stuDao == null ? new StudentDaoImpl(DialogActivity.this) : stuDao);
				//这个演示示例修改的班号为2的班级内学生,初始化数据中班号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.
				List<CItem> list = stuDao.getCItemStudents(2);
				showDialog(list, 1);
				break;
			default:
				break;
			}
		}
	};

	public void toastShow(String text) {
		Toast.makeText(this, text, 1000).show();
	}
	//多选对话框
	public void showDialog(List<CItem> list, final int classesId) {

		int listSize = list.size();
		String[] ids = new String[listSize];// 所有id集合
		String[] values = new String[listSize]; // 所有name集合
		boolean[] flags = new boolean[listSize]; // 定义对象是否与实体建立了关联关系.
		// 初始化关联关系
		for (int j = 0; j < listSize; j++) {
			CItem item = list.get(j);
			ids[j] = item.getId();
			values[j] = item.getValue();
			flags[j] = item.getFlag();
		}

		// 定义复选框选项
		final String[] choiceItems = values;
		// 复选框默认值：false=未选;true=选中
		final boolean[] tempStatus = new boolean[flags.length];
		System.arraycopy(flags, 0, tempStatus, 0, flags.length);// 此处必须深复制
		final boolean[] sourceStatus = new boolean[flags.length];
		System.arraycopy(flags, 0, sourceStatus, 0, flags.length);// 此处必须深复制
		final List<CItem> tempList = list;

		// 创建对话框
		new AlertDialog.Builder(this).setTitle("请选择")// 设置对话框标题
				.setMultiChoiceItems(choiceItems, tempStatus,
						new OnMultiChoiceClickListener() {
							@Override
							public void onClick(DialogInterface dialog,
									int which, boolean isChecked) {
								// 来回重复选择取消，得相应去改变item对应的bool值，点击确定时，根据这个bool[],得到选择的内容
								tempStatus[which] = isChecked;
							}
						}) // 设置对话框[肯定]按钮
				.setPositiveButton("确定", new DialogInterface.OnClickListener() {
					@Override
					public void onClick(DialogInterface dialog, int which) {
						dealRel(tempList, sourceStatus, tempStatus, classesId);//更新数据
					}
				}).setNegativeButton("取消", null)// 设置对话框[否定]按钮
				.show();

	}

	// 更新数据,判断原来的关系和现在的关系,如果发生变化则更新
	public void dealRel(List<CItem> list, boolean[] sourceStatus,
			boolean[] targetStatus, int classesId) {
		stuDao = (stuDao == null ? new StudentDaoImpl(DialogActivity.this) : stuDao);
		for (int i = 0; i < targetStatus.length; i++) {
			if (sourceStatus[i] != targetStatus[i]) {
				Student student = stuDao.get(Integer.parseInt(list.get(i).getId()));
				if (targetStatus[i] == true) {
					student.setClassesId(classesId);//如果选中了则设置新班号.
				} else {
					student.setClassesId(0);//demo中处理时把没选中班号修改为了0.
				}
				stuDao.update(student);//调用AHibernate中的方法更新.
			}
		}
		toastShow("保存成功!");
	}
}






其他代码:



ClassesDaoImpl.java:




package com.tgb.lk.demo.dao.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import android.content.Context;

import com.tgb.lk.ahibernate.dao.impl.BaseDaoImpl;
import com.tgb.lk.demo.model.Classes;
import com.tgb.lk.demo.util.CItem;
import com.tgb.lk.demo.util.DBHelper;
//本文数据库处理引用jar包AHibernate1.1处理.
//AHibernate的详细使用教程示例地址: http://blog.csdn.net/lk_blog/article/details/7455992
//AHibernate源码交流地址: http://blog.csdn.net/lk_blog/article/details/7456125
//AHibernate jar包下载及源代码下载地址: http://download.csdn.net/detail/lk_blog/4222048
public class ClassesDaoImpl extends BaseDaoImpl<Classes> {
	public ClassesDaoImpl(Context context) {
		super(new DBHelper(context),Classes.class);
	}
	
	public void deleteAll() {
		super.execSql("delete from t_classes", null);
	}
	//查询所有班级保存到List<CItem>.
	public List<CItem> getCItemClasses(){
		String sql = "select _id,name from t_classes";
		List<Map<String, String>> list = super.query2MapList(sql, null);
		List<CItem> retList = new ArrayList<CItem>();
		for (Map<String, String> map : list) {
			CItem item= new CItem();
			item.setId(map.get("_id"));
			item.setValue(map.get("name"));
			retList.add(item);
		}
		return retList;
	}
}




CItem.java:





package com.tgb.lk.demo.util;
//处理单选和多选框的工具实体类
public class CItem implements Cloneable{

	private String id = "";
	private String value = "";
	private boolean flag = false;//控制多选框默认是否选中状态.

	public CItem() {
	}

	public CItem(String _ID, String _Value) {
		id = _ID;
		value = _Value;
	}

	@Override
	public String toString() {
		// 这个必须重写才能保证显示正常,因为适配器在显示数据的时候，如果传入适配器的对象不是字符串的情况下，直接就使用对象.toString()
		return value;
	}

	public String getId() {
		return id;
	}

	public String getValue() {
		return value;
	}

	public void setId(String id) {
		this.id = id;
	}

	public void setValue(String value) {
		this.value = value;
	}

	public boolean getFlag() {
		return flag;
	}

	public void setFlag(boolean flag) {
		this.flag = flag;
	}

}



DBHelper.java:





package com.tgb.lk.demo.util;

import com.tgb.lk.ahibernate.util.MyDBHelper;
import com.tgb.lk.demo.model.Classes;
import com.tgb.lk.demo.model.Student;
import android.content.Context;

public class DBHelper extends MyDBHelper {
	private static final String DBNAME = "school.db";// 数据库名
	private static final int DBVERSION = 1;
	private static final Class<?>[] clazz = { Student.class, Classes.class };// 要初始化的表

	public DBHelper(Context context) {
		super(context, DBNAME, null, DBVERSION, clazz);
	}
}
Classes.java:





package com.tgb.lk.demo.model;

import com.tgb.lk.ahibernate.annotation.Column;
import com.tgb.lk.ahibernate.annotation.Id;
import com.tgb.lk.ahibernate.annotation.Table;

@Table(name = "t_classes")
public class Classes {
	@Id
	@Column(name = "_id")
	private int id;

	@Column(name = "name")
	private String name;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "Classes [id=" + id + ", name=" + name + "]";
	}

}

Student.java:





package com.tgb.lk.demo.model;

import com.tgb.lk.ahibernate.annotation.Column;
import com.tgb.lk.ahibernate.annotation.Id;
import com.tgb.lk.ahibernate.annotation.Table;

//自动生成的建表语句:
//CREATE TABLE t_student (id INTEGER primary key autoincrement, classes TEXT, teacher_id INTEGER, name TEXT(20))

@Table(name = "t_student")
public class Student {
	@Id
	@Column(name = "_id")
	private int id; // 主键,int类型,数据库建表时此字段会设为自增长

	@Column(name = "name", length = 20)
	private String name; // 名字长度一般不会超过20个字符吧,length=20数据字段的长度是20

	@Column(name = "classesid")
	private int classesId;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getClassesId() {
		return classesId;
	}

	public void setClassesId(int classesId) {
		this.classesId = classesId;
	}

	@Override
	public String toString() {
		return "Student [classesId=" + classesId + ", id=" + id + ", name="
				+ name + "]";
	}

}


源代码下载地址:http://download.csdn.net/detail/lk_blog/5005962

限于本人水平有限,很多地方写的并不完美,希望大家不吝赐教.如果觉得本文对您有帮助请顶支持一下,如果有不足之处欢迎留言交流,希望在和大家的交流中得到提高.









  


  

    
    
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