【Android】_SQLiteDemo_学生管理系统
Android studio学生信息管理系统
- (一)基于SQLite的Android应用
- (二)创建SQLiteDemo教程
- 1. 效果实现图
- 2. 项目结构图
- 3. 具体的编码实现
- 3.1xml布局
- 3.2 java文件配置
- 3.3 界面美化
(一)基于SQLite的Android应用
1. 关于SQLite
SQLite 是一个软件库，实现了自给自足的、无服务器的、零配置的、事务性的 SQL 数据库引擎。SQLite 是在世界上最广泛部署的 SQL 数据库引擎。SQLite 源代码不受版权限制。
SQLite的核心引擎本身不依赖第三方的软件，在我们开发时直接使用即可。
2. SQLiteDatabase、SQLiteOpenHelper、Cursor(游标) 使用解释
-
SQLiteDatabase:
SQLiteDatabase是SQLite数据库类, 用于创建数据库. -
SQLiteOpenHelper：
SQLiteOpenHelper这个类用来管理数据库。包括创建 和更新 数据库。所以我们只要继承SQLiteOpenHelper类来就可以对数据库进行管理。 -
Cursor(游标):
SQLite查询的结果是返回一个游标（Cursor）。类似于我们在java学习数据库操作中的ResultSet类差不多, rawQuery(String sql, String[] selectionArgs)。通过移动游标来进行数据的查询。
(二)创建SQLiteDemo教程
目标：通过一个SQLite的数据库的操作实现学生信息的增删改查
1）实现多个学生信息的添加和显示
2）用EditText实现姓名、年龄的输入，并有输入校验（空校验，数字校验）
3）用AutoCompleteTextView的实现专业的输入，并有提示功能。
4）通过CheckBox实现多门课程选择
5）通过Radio实现性别
6）用下拉框选择学院
7）用日期控件实现入学时间的输入
8）点击提交按钮后，将输入的信息，用列表控件ListView显示在另一个Activity。
9）实现列表中学生信息的编辑和删除。
1. 效果实现图
增添：
查询：
删除和修改：
2. 项目结构图
2.1 项目分配：
menu.xml不是放在layout目录下，而是放在menu目录下。
- 在res下->右键新建Resource Directory->设置type为menu->命名为menu
- 在menu文件夹下->新建Resource File->命名为menu
2.2 自定义类的Java文件:
StudentDao、StudentDBHelper、Student、TableContanst
- 在MainActivity.java文件目录下右键新建StudentDao.class类：
- 重复上述步骤新建StudentDBHelper、Student、TableContanst类。
2.3美化样式文件：
2.4 其他文件:
string .xml、color.xml、styles.xml、AndroidManifest.xml(自定义的活动需要手动添加到此文件中)
2.5 完成目录：
3. 具体的编码实现
3.1xml布局
- 布局界面引入了ListView，activity_main.xml:
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout android:id="@+id/RelativeLayout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#a1afc9">
<Button
android:id="@+id/bn_search_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" 搜 索 "
android:textSize="15sp"
android:textColor="#a1afc9"
android:background="@drawable/shape_button_white"
android:gravity="center"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"/>
<Button
android:gravity="center"
android:text=" 添 加 "
android:id="@+id/btn_add_student"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/bn_search_id"
android:layout_toLeftOf="@+id/bn_select"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:textColor="#ffffff"
android:textSize="15sp"
android:background="@drawable/shape_button"/>
<Button
android:gravity="center"
android:text="选 择"
android:id="@+id/bn_select"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
android:textColor="#ffffff"
android:textSize="15sp"
android:background="@drawable/shape_button">Button>
RelativeLayout>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text=" ID 姓 名 年 龄 性 别 "
android:textSize="18sp"
android:textColor="#4b5cc4"
/>
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<LinearLayout
android:orientation="horizontal"
android:id="@+id/showLiner"
android:visibility="gone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<Button
android:id="@+id/bn_delete"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="删除"
android:enabled="false"
/>
<Button
android:id="@+id/bn_selectall"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="全选"
/>
<Button
android:id="@+id/bn_canel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="取消"
/>
LinearLayout>
LinearLayout>
- 自定义student_list_item.xml用于存放学生列表
student_list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="fill_parent"
android:layout_height="130px"
android:layout_gravity="center"
android:layout_weight="1"
android:background="@drawable/icon_man" />
<TextView
android:id="@+id/tv_stu_id"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView
android:id="@+id/tv_stu_name"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView android:id="@+id/tv_stu_age"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView
android:id="@+id/tv_stu_sex"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
<TextView
android:id="@+id/tv_stu_likes"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
<TextView android:id="@+id/tv_stu_phone"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
<TextView android:id="@+id/tv_stu_traindate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:visibility="gone"/>
<TextView
android:id="@+id/tv_stu_modifyDateTime"
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
<CheckBox
android:id="@+id/cb_box"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"
android:checked="false"
android:focusable="false"/>
LinearLayout>
- 自定义menu.xml,用于对学生信息进行操作：
menu.xml
<menu xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="40dip"
android:layout_width="80dip">
<group android:checkableBehavior="single">
<item android:id="@+id/delete" android:title="删除学员信息" />
<item android:id="@+id/look" android:title="详细信息" />
<item android:id="@+id/write" android:title="修改学员信息" />
group>
menu>
- 创建activity，命名为activity_student_info.xml，用于单条学生信息查看，相应.java文件见后文；
activity_student_info.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#a1afc9"
android:padding="5dip" >
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:layout_marginBottom="5dp"
android:gravity="center"
android:text="学生信息"
android:textColor="#4b5cc4"
android:textSize="30dp"/>
<TextView android:id="@+id/id2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:layout_marginRight="5dip"
android:layout_marginTop="50dip"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:gravity="left|center_vertical"
android:text="学员ID：" />
<TextView android:id="@+id/tv_info_id"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/id2_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/id2_text_id"
android:gravity="left|center_vertical"/>
<TextView android:id="@+id/name2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:layout_marginRight="5dip"
android:layout_marginTop="8dip"
android:layout_marginBottom="8dip"
android:layout_below="@id/id2_text_id"
android:layout_alignLeft="@id/id2_text_id"
android:textSize="16sp"
android:gravity="left|center_vertical"
android:text="姓名：" />
<TextView android:id="@+id/tv_info_name"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/name2_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/name2_text_id"
android:gravity="left|center_vertical" />
<TextView android:id="@+id/age2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="left|center_vertical"
android:layout_marginRight="5dip"
android:layout_below="@id/name2_text_id"
android:layout_marginBottom="8dip"
android:textSize="16sp"
android:text="年龄：" />
<TextView android:id="@+id/tv_info_age"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/age2_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/age2_text_id"
android:gravity="left|center_vertical" />
<TextView android:id="@+id/sex2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="left|center_vertical"
android:layout_below="@id/age2_text_id"
android:layout_alignLeft="@id/age2_text_id"
android:layout_marginRight="5dip"
android:layout_marginBottom="8dip"
android:text="性别："
android:textSize="16sp" />
<TextView
android:id="@+id/tv_info_sex"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/sex2_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/sex2_text_id"
android:gravity="left|center_vertical" />
<TextView android:id="@+id/like2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="left|center_vertical"
android:layout_below="@id/sex2_text_id"
android:layout_alignLeft="@id/sex2_text_id"
android:layout_marginRight="5dip"
android:layout_marginBottom="8dip"
android:text="专业："
android:textSize="16sp" />
<TextView android:layout_height="40dip"
android:id="@+id/tv_info_likes"
android:layout_width="wrap_content"
android:layout_toRightOf="@id/like2_text_id"
android:layout_below="@id/sex2_text_id"
android:layout_marginRight="52dip"
android:gravity="left|center_vertical"/>
<TextView android:id="@+id/contact2_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|left"
android:layout_marginRight="5dip"
android:layout_below="@id/like2_text_id"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="联系电话：" />
<TextView android:id="@+id/tv_info_phone"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/contact2_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/contact2_text_id"
android:gravity="center_vertical|left" />
<TextView android:id="@+id/train2_time_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|left"
android:layout_marginRight="5dip"
android:layout_below="@id/contact2_text_id"
android:layout_marginBottom="8dip"
android:textSize="16sp"
android:text="入学日期:" />
<TextView android:id="@+id/tv_info_train_date"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/train2_time_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/train2_time_text_id"
android:gravity="center_vertical|left" />
<Button android:id="@+id/back_to_list_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="Go back"
android:textSize="20sp"
android:layout_below="@id/train2_time_text_id"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:onClick="goBack"
android:background="@drawable/shape_button_white"
android:textColor="#a1afc9">
Button>
RelativeLayout>
- 创建activity，命名为activity_add_student.xml，用于添加学生信息，相应.java文件见后文；
activity_add_student.xml
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"
android:scrollbarStyle="outsideInset" >
<RelativeLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:padding="5dip" >
<TextView
android:id="@+id/tv1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="student info"
android:textSize="25sp"
android:textColor="#4b5cc4"/>
<TextView android:id="@+id/tv_stu_text_id"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_marginRight="5dip"
android:layout_below="@id/tv1"
android:layout_marginTop="20dip"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="学员ID：" />
<TextView android:id="@+id/tv_stu_id"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:text="未分配ID"
android:layout_toRightOf="@id/tv_stu_text_id"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_stu_text_id"
android:gravity="center"
android:background="#ffffff"
android:textColor="#000000"
android:textSize="16sp" />
<TextView android:id="@+id/tv_name_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_marginRight="5dip"
android:layout_below="@id/tv_stu_text_id"
android:layout_alignLeft="@id/tv_stu_text_id"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="姓名：" />
<EditText android:id="@+id/et_name"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/tv_name_text"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_name_text"
android:hint="请输入姓名"
android:inputType="textPersonName"
android:paddingLeft="20dip"
android:background="@drawable/shape_edit"/>
<TextView android:id="@+id/tv_age_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_marginRight="5dip"
android:layout_below="@id/tv_name_text"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="年龄：" />
<EditText android:id="@+id/et_age"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/tv_age_text"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_age_text"
android:hint="请输入年龄"
android:paddingLeft="20dip"
android:maxLength="3"
android:inputType="number"
android:background="@drawable/shape_edit"/>
<TextView android:id="@+id/tv_sex_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_below="@id/tv_age_text"
android:layout_alignLeft="@id/tv_age_text"
android:layout_marginRight="5dip"
android:layout_marginBottom="5dip"
android:text="性别："
android:textSize="16sp" />
<RadioGroup
android:id="@+id/rg_sex"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:orientation="horizontal"
android:layout_toRightOf="@id/tv_sex_text"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_sex_text" >
<RadioButton
android:id="@+id/rb_sex_male"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="男"
android:textSize="16sp" />
<RadioButton android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"
android:id="@+id/rb_sex_female"
android:layout_weight="1"
android:textSize="16sp">
RadioButton>
RadioGroup>
<TextView android:id="@+id/tv_likes_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_below="@id/rg_sex"
android:layout_alignLeft="@id/tv_sex_text"
android:layout_marginRight="5dip"
android:layout_marginBottom="5dip"
android:text="专业："
android:textSize="16sp" />
<CheckBox android:id="@+id/box1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/tv_likes_text"
android:layout_below="@+id/rg_sex"
android:text="@string/box1" >CheckBox>
<CheckBox android:id="@+id/box2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/box1"
android:layout_below="@+id/rg_sex"
android:text="@string/box2">
CheckBox>
<CheckBox android:id="@+id/box3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/box2"
android:layout_below="@+id/rg_sex"
android:text="@string/box3" >
CheckBox>
<TextView android:id="@+id/tv_phone_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_marginRight="5dip"
android:layout_below="@id/tv_likes_text"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="联系电话：" />
<EditText android:id="@+id/et_phone"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/tv_phone_text"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_phone_text"
android:hint="请输入手机号"
android:paddingLeft="20dip"
android:inputType="phone"
android:maxLength="11"
android:background="@drawable/shape_edit"/>
<TextView android:id="@+id/tv_traindate_text"
android:layout_width="80dip"
android:layout_height="40dip"
android:gravity="center_vertical|right"
android:layout_marginRight="5dip"
android:layout_below="@id/tv_phone_text"
android:layout_marginBottom="5dip"
android:textSize="16sp"
android:text="入学日期" />
<EditText android:id="@+id/et_traindate"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@id/tv_traindate_text"
android:layout_alignParentRight="true"
android:layout_alignTop="@id/tv_traindate_text"
android:hint="点击选择日期"
android:inputType="date"
android:paddingLeft="20dip"
android:focusable="false"
android:background="@drawable/shape_edit"/>
<Button android:id="@+id/btn_save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="18dp"
android:text="保存"
android:layout_below="@id/tv_traindate_text"
android:layout_alignRight="@id/rg_sex"
android:textColor="#ffffff"
android:textSize="15sp"
android:background="@drawable/shape_button">
Button>
<Button android:id="@+id/btn_clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="重置"
android:layout_below="@id/tv_traindate_text"
android:layout_toLeftOf="@id/btn_save"
android:layout_marginRight="10dip"
android:layout_marginTop="18dp"
android:textColor="#ffffff"
android:textSize="15sp"
android:background="@drawable/shape_button">
Button>
RelativeLayout>
ScrollView>
- 创建activity，命名为activity_search.xml,用于查询学生信息，相应.java文件见后文；
activity_search.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
>
<EditText
android:id="@+id/et_srarch"
android:layout_width="300dp"
android:layout_height="50dp"
android:hint="请输入学员姓名"
android:inputType="textPersonName"
android:background="@drawable/shape_edit"/>
<Button
android:id="@+id/bn_sure_search"
android:gravity="center"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="确定"
android:textColor="#ffffff"
android:textSize="18sp"
android:background="@drawable/shape_button"/>
<Button
android:id="@+id/bn_return"
android:gravity="center"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="返回"
android:textColor="#ffffff"
android:textSize="18sp"
android:background="@drawable/shape_button"/>
<LinearLayout
android:id="@+id/linersearch"
android:orientation="vertical"
android:visibility="gone"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="ID 姓 名 年 龄 性 别 专 业 电 话 日 期"
android:textSize="15dp"
android:textColor="#ff3300"
/>
<ListView
android:id="@+id/searchListView"
android:layout_weight="1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="right"
/>
<Button
android:id="@+id/return_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="返回"
android:textSize="15dp"
android:textColor="#ffffff"
android:background="@drawable/shape_button"/>
LinearLayout>
LinearLayout>
- 自定义find_student_list_item.xml，用于查询时显示格式
find_student_list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
>
<TextView android:id="@+id/tv_stu_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_name"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_age"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_sex"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_likes"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_phone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/tv_stu_traindate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
LinearLayout>
3.2 java文件配置
1.MainActivity.java，可以查看数据库里的学生列表，通过button触发“增删改查”的操作；
package com.example.cungu.sqlitedemo;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends ListActivity implements View.OnClickListener,
AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener {
private static final String TAG = "TestSQLite";
private Button addStudent;
private Cursor cursor;
private SimpleCursorAdapter adapter;
private ListView listView;
private List<Long> list;
private RelativeLayout relativeLayout;
private Button searchButton;
private Button selectButton;
private Button deleteButton;
private Button selectAllButton;
private Button canleButton;
private LinearLayout layout;
private StudentDao dao;
private Student student;
private Boolean isDeleteList = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.e(TAG, "onCreate");
list = new ArrayList<Long>();
student = new Student();
dao = new StudentDao(new StudentDBHelper(this));
addStudent = (Button) findViewById(R.id.btn_add_student);
searchButton = (Button) findViewById(R.id.bn_search_id);
selectButton = (Button) findViewById(R.id.bn_select);
deleteButton = (Button) findViewById(R.id.bn_delete);
selectAllButton = (Button) findViewById(R.id.bn_selectall);
canleButton = (Button) findViewById(R.id.bn_canel);
layout = (LinearLayout) findViewById(R.id.showLiner);
relativeLayout=(RelativeLayout) findViewById(R.id.RelativeLayout);
listView = getListView();
// 为按键设置监听
addStudent.setOnClickListener(this);
searchButton.setOnClickListener(this);
selectButton.setOnClickListener(this);
deleteButton.setOnClickListener(this);
canleButton.setOnClickListener(this);
selectAllButton.setOnClickListener(this);
listView.setOnItemClickListener(this);
listView.setOnItemLongClickListener(this);
listView.setOnCreateContextMenuListener(this);
}
// 调用load()方法将数据库中的所有记录显示在当前页面
@Override
protected void onStart() {
super.onStart();
load();
}
public void onClick(View v) {
// 跳转到添加信息的界面
if (v == addStudent) {
startActivity(new Intent(this,add_student.class));
} else if (v == searchButton) {
// 跳转到查询界面
startActivity(new Intent(this, search.class));
} else if (v == selectButton) {
// 跳转到选择界面
isDeleteList = !isDeleteList;
if (isDeleteList) {
checkOrClearAllCheckboxs(true);
} else {
showOrHiddenCheckBoxs(false);
}
} else if (v == deleteButton) {
// 删除数据
if (list.size() > 0) {
for (int i = 0; i < list.size(); i++) {
long id = list.get(i);
Log.e(TAG, "delete id=" + id);
int count = dao.deleteStudentById(id);
}
dao.closeDB();
load();
}
} else if (v == canleButton) {
// 点击取消，回到初始界面
load();
layout.setVisibility(View.GONE);
isDeleteList = !isDeleteList;
} else if (v == selectAllButton) {
// 全选，如果当前全选按钮显示是全选，则在点击后变为取消全选，如果当前为取消全选，则在点击后变为全选
selectAllMethods();
}
}
// 创建菜单
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
MenuInflater inflater = new MenuInflater(this); //getMenuInflater();
inflater.inflate(R.menu.menu, menu);
}
// 对菜单中的按钮添加响应时间
@Override
public boolean onContextItemSelected(MenuItem item) {
int item_id = item.getItemId();
student = (Student) listView.getTag();
Log.v(TAG, "TestSQLite++++student+" + listView.getTag() + "");
final long student_id = student.getId();
Intent intent = new Intent();
Log.v(TAG, "TestSQLite+++++++id"+student_id);
switch (item_id) {
/* 添加
case R.id.add:
startActivity(new Intent(this, AddStudentActivity.class));
break;*/
// 删除
case R.id.delete:
deleteStudentInformation(student_id);
break;
case R.id.look:
// 查看学生信息
Log.v(TAG, "TestSQLite+++++++look"+student+"");
intent.putExtra("student", student);
intent.setClass(this, student_info.class);
this.startActivity(intent);
break;
case R.id.write:
// 修改学生信息
intent.putExtra("student", student);
intent.setClass(this, add_student.class);
this.startActivity(intent);
break;
default:
break;
}
return super.onContextItemSelected(item);
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id)
{
Student student = (Student) dao.getStudentFromView(view, id);
listView.setTag(student);
registerForContextMenu(listView);
return false;
}
// 点击一条记录是触发的事件
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
if (!isDeleteList) {
student = dao.getStudentFromView(view, id);
Log.e(TAG, "student*****" + dao.getStudentFromView(view, id));
Intent intent = new Intent();
intent.putExtra("student", student);
intent.setClass(this, student_info.class);
this.startActivity(intent);
} else {
CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
box.setChecked(!box.isChecked());
list.add(id);
deleteButton.setEnabled(box.isChecked());
}
}
// 自定义一个加载数据库中的全部记录到当前页面的无参方法
public void load() {
StudentDBHelper studentDBHelper = new StudentDBHelper(this);
SQLiteDatabase database = studentDBHelper.getWritableDatabase();
cursor = database.query(TableContanst.STUDENT_TABLE, null, null, null,
null, null, TableContanst.StudentColumns.MODIFY_TIME + " desc");
startManagingCursor(cursor);
adapter = new SimpleCursorAdapter(this, R.layout.student_list_item,
cursor, new String[] { TableContanst.StudentColumns.ID,
TableContanst.StudentColumns.NAME,
TableContanst.StudentColumns.AGE,
TableContanst.StudentColumns.SEX,
TableContanst.StudentColumns.LIKES,
TableContanst.StudentColumns.PHONE_NUMBER,
TableContanst.StudentColumns.TRAIN_DATE }, new int[] {
R.id.tv_stu_id, R.id.tv_stu_name, R.id.tv_stu_age,
R.id.tv_stu_sex, R.id.tv_stu_likes, R.id.tv_stu_phone,
R.id.tv_stu_traindate });
listView.setAdapter(adapter);
}
// 全选或者取消全选
private void checkOrClearAllCheckboxs(boolean b) {
int childCount = listView.getChildCount();
Log.e(TAG, "list child size=" + childCount);
for (int i = 0; i < childCount; i++) {
View view = listView.getChildAt(i);
if (view != null) {
CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
box.setChecked(!b);
}
}
showOrHiddenCheckBoxs(true);
}
// 显示或者隐藏自定义菜单
private void showOrHiddenCheckBoxs(boolean b) {
int childCount = listView.getChildCount();
Log.e(TAG, "list child size=" + childCount);
for (int i = 0; i < childCount; i++) {
View view = listView.getChildAt(i);
if (view != null) {
CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
int visible = b ? View.VISIBLE : View.GONE;
box.setVisibility(visible);
layout.setVisibility(visible);
deleteButton.setEnabled(false);
}
}
}
// 自定义一个利用对话框形式进行数据的删除
private void deleteStudentInformation(final long delete_id) {
// 利用对话框的形式删除数据
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("学员信息删除")
.setMessage("确定删除所选记录?")
.setCancelable(false)
.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
int raws = dao.deleteStudentById(delete_id);
layout.setVisibility(View.GONE);
isDeleteList = !isDeleteList;
load();
if (raws > 0) {
Toast.makeText(MainActivity.this, "删除成功!",Toast.LENGTH_LONG).show();
} else
Toast.makeText(MainActivity.this, "删除失败!",Toast.LENGTH_LONG).show();
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
// 点击全选事件时所触发的响应
private void selectAllMethods() {
// 全选，如果当前全选按钮显示是全选，则在点击后变为取消全选，如果当前为取消全选，则在点击后变为全选
if (selectAllButton.getText().toString().equals("全选")) {
int childCount = listView.getChildCount();
for (int i = 0; i < childCount; i++) {
View view = listView.getChildAt(i);
if (view != null) {
CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
box.setChecked(true);
deleteButton.setEnabled(true);
selectAllButton.setText("取消全选");
}
}
} else if (selectAllButton.getText().toString().equals("取消全选")) {
checkOrClearAllCheckboxs(true);
deleteButton.setEnabled(false);
selectAllButton.setText("全选");
}
}
}
- student_info.java，显示一个学生的详细信息；
package com.example.cungu.sqlitedemo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class student_info extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_info);
Intent intent = getIntent();
Student student = (Student) intent.getSerializableExtra(TableContanst.STUDENT_TABLE);
((TextView)findViewById(R.id.tv_info_id)).setText(student.getId()+"");
((TextView)findViewById(R.id.tv_info_name)).setText(student.getName());
((TextView)findViewById(R.id.tv_info_age)).setText(student.getAge()+"");
((TextView)findViewById(R.id.tv_info_sex)).setText(student.getSex());
((TextView)findViewById(R.id.tv_info_likes)).setText(student.getLike());
((TextView)findViewById(R.id.tv_info_train_date)).setText(student.getTrainDate());
((TextView)findViewById(R.id.tv_info_phone)).setText(student.getPhoneNumber());
}
public void goBack(View view) {
finish();
}
}
- add_student.java，添加学生；
package com.example.cungu.sqlitedemo;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.io.Serializable;
import java.text.SimpleDateFormat;
import java.util.Date;
public class add_student extends AppCompatActivity implements View.OnClickListener{
private static final String TAG = "AddStudentActivity";
private final static int DATE_DIALOG = 1;
private static final int DATE_PICKER_ID = 1;
private TextView idText;
private EditText nameText;
private EditText ageText;
private EditText phoneText;
private EditText dataText;
private RadioGroup group;
private RadioButton button1;
private RadioButton button2;
private CheckBox box1;
private CheckBox box2;
private CheckBox box3;
private Button restoreButton;
private String sex;
private Button resetButton;
private Long student_id;
private StudentDao dao;
private boolean isAdd = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_student);
idText = (TextView) findViewById(R.id.tv_stu_id);
nameText = (EditText) findViewById(R.id.et_name);
ageText = (EditText) findViewById(R.id.et_age);
button1 = (RadioButton) findViewById(R.id.rb_sex_female);
button2 = (RadioButton) findViewById(R.id.rb_sex_male);
phoneText = (EditText) findViewById(R.id.et_phone);
dataText = (EditText) findViewById(R.id.et_traindate);
group = (RadioGroup) findViewById(R.id.rg_sex);
box1 = (CheckBox) findViewById(R.id.box1);
box2 = (CheckBox) findViewById(R.id.box2);
box3 = (CheckBox) findViewById(R.id.box3);
restoreButton = (Button) findViewById(R.id.btn_save);
resetButton = (Button) findViewById(R.id.btn_clear);
dao = new StudentDao(new StudentDBHelper(this)); // 设置监听 78
restoreButton.setOnClickListener(this);
resetButton.setOnClickListener(this);
dataText.setOnClickListener(this);
checkIsAddStudent();
}
// 检查此时Activity是否用于添加学员信息
private void checkIsAddStudent() {
Intent intent = getIntent();
Serializable serial = intent.getSerializableExtra(TableContanst.STUDENT_TABLE);
if (serial == null) {
isAdd = true;
dataText.setText(getCurrentDate());
} else {
isAdd = false;
Student s = (Student) serial;
showEditUI(s);
}
}
//显示学员信息更新的UI104
private void showEditUI(Student student) {
// 先将Student携带的数据还原到student的每一个属性中去
student_id = student.getId();
String name = student.getName();
int age = student.getAge();
String phone = student.getPhoneNumber();
String data = student.getTrainDate();
String like = student.getLike();
String sex = student.getSex();
if (sex.toString().equals("男")) {
button2.setChecked(true);
} else if (sex.toString().equals("女")) {
button1.setChecked(true);
}
if (like != null && !"".equals(like)) {
if (box1.getText().toString().indexOf(like) >= 0) {
box1.setChecked(true);
}
if (box2.getText().toString().indexOf(like) >= 0) {
box2.setChecked(true);
}
if (box3.getText().toString().indexOf(like) >= 0) {
box3.setChecked(true);
}
}
// 还原数据
idText.setText(student_id + "");
nameText.setText(name + "");
ageText.setText(age + "");
phoneText.setText(phone + "");
dataText.setText(data + "");
setTitle("学员信息更新");
restoreButton.setText("更新");
}
public void onClick(View v) {
// 收集数据
if (v == restoreButton) {
if (!checkUIInput()) {// 界面输入验证
return;
}
Student student = getStudentFromUI();
if (isAdd) {
long id = dao.addStudent(student);
dao.closeDB();
if (id > 0) {
Toast.makeText(this, "保存成功， ID=" + id,Toast.LENGTH_SHORT).show();
finish();
} else {
Toast.makeText(this, "保存失败，请重新输入！", Toast.LENGTH_SHORT).show();
}
} else if (!isAdd) {
long id = dao.addStudent(student);
dao.closeDB();
if (id > 0) {
Toast.makeText(this, "更新成功",Toast.LENGTH_SHORT).show();
finish();
} else {
Toast.makeText(this, "更新失败，请重新输入！",Toast.LENGTH_SHORT).show();
}
}
} else if (v == resetButton) {
clearUIData();
} else if (v == dataText) {
showDialog(DATE_PICKER_ID);
}
}
// 清空界面的数据176
private void clearUIData() {
nameText.setText("");
ageText.setText("");
phoneText.setText("");
dataText.setText("");
box1.setChecked(false);
box2.setChecked(false);
group.clearCheck();
}
// 收集界面输入的数据，并将封装成Student对象
private Student getStudentFromUI() {
String name = nameText.getText().toString();
int age = Integer.parseInt(ageText.getText().toString());
String sex = ((RadioButton) findViewById(group.getCheckedRadioButtonId())).getText().toString();
String likes = "";
if (box1.isChecked()) { // basketball, football football
likes += box1.getText();
}
if (box2.isChecked()) {
if (likes.equals("")) {
likes += box2.getText();
} else {
likes += "," + box2.getText();
}
if (likes.equals("")) {
likes += box3.getText();
} else {
likes += "," + box3.getText();
}
}
String trainDate = dataText.getText().toString();
String phoneNumber = phoneText.getText().toString();
String modifyDateTime = getCurrentDateTime();
Student s=new Student(name, age, sex, likes, phoneNumber, trainDate,
modifyDateTime);
if (!isAdd) {
s.setId(Integer.parseInt(idText.getText().toString()));
dao.deleteStudentById(student_id);
}
return s;
}
// * 得到当前的日期时间
private String getCurrentDateTime() {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
return format.format(new Date());
}
// * 得到当前的日期
private String getCurrentDate() {
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
return format.format(new Date());
}
//验证用户是否按要求输入了数据
private boolean checkUIInput() { // name, age, sex
String name = nameText.getText().toString();
String age = ageText.getText().toString();
int id = group.getCheckedRadioButtonId();
String message = null;
View invadView = null;
if (name.trim().length() == 0) {
message = "请输入姓名！";
invadView = nameText;
} else if (age.trim().length() == 0) {
message = "请输入年龄！";
invadView = ageText;
} else if (id == -1) {
message = "请选择性别！";
}
if (message != null) {
Toast.makeText(this, message, Toast.LENGTH_SHORT).show();
if (invadView != null)
invadView.requestFocus();
return false;
} return true; }
//时间的监听与事件
private DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener()
{
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
dataText.setText(year + "-" + (monthOfYear + 1) + "-" + dayOfMonth);
}
};
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_PICKER_ID:
return new DatePickerDialog(this, onDateSetListener, 2016, 9, 10);
}
return null;
}
}
- search.java，从数据库获取学生信息；
package com.example.cungu.sqlitedemo;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
public class search extends AppCompatActivity implements View.OnClickListener{
private EditText nameText;
private Button button;
private Button reButton;
private Cursor cursor;
private SimpleCursorAdapter adapter;
private ListView listView;
private StudentDao dao;
private Button returnButton;
private LinearLayout layout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
nameText = (EditText) findViewById(R.id.et_srarch);
layout=(LinearLayout) findViewById(R.id.linersearch);
button = (Button) findViewById(R.id.bn_sure_search);
reButton = (Button) findViewById(R.id.bn_return);
listView = (ListView) findViewById(R.id.searchListView);
returnButton = (Button) findViewById(R.id.return_id);
dao = new StudentDao(new StudentDBHelper(this));
reButton.setOnClickListener(this);
returnButton.setOnClickListener(this);
button.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v == button) {
reButton.setVisibility(View.GONE);
button.setVisibility(View.GONE);
nameText.setVisibility(View.GONE);
layout.setVisibility(View.VISIBLE);
String name = nameText.getText().toString();
cursor = dao.findStudent(name);
if (!cursor.moveToFirst()) {
Toast.makeText(this, "没有所查学员信息！", Toast.LENGTH_SHORT).show();
} else
//如果有所查询的信息，则将查询结果显示出来
adapter = new SimpleCursorAdapter(this, R.layout.find_student_list_item,
cursor, new String[] { TableContanst.StudentColumns.ID,
TableContanst.StudentColumns.NAME,
TableContanst.StudentColumns.AGE,
TableContanst.StudentColumns.SEX,
TableContanst.StudentColumns.LIKES,
TableContanst.StudentColumns.PHONE_NUMBER,
TableContanst.StudentColumns.TRAIN_DATE },
new int[] {
R.id.tv_stu_id,
R.id.tv_stu_name,
R.id.tv_stu_age,
R.id.tv_stu_sex,
R.id.tv_stu_likes,
R.id.tv_stu_phone,
R.id.tv_stu_traindate });
listView.setAdapter(adapter);
}else if(v==reButton|v==returnButton){
finish();
}
}
}
- 自定义类StudentDao.java，用于封装对数据库增删改查操作函数；
package com.example.cungu.sqlitedemo;
import com.example.cungu.sqlitedemo.StudentDBHelper;
import com.example.cungu.sqlitedemo.TableContanst;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.view.View;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import com.example.cungu.sqlitedemo.Student;
public class StudentDao {
private StudentDBHelper dbHelper;
private Cursor cursor;
public StudentDao(StudentDBHelper dbHelper) {
this.dbHelper = dbHelper;
}
// 添加一个Student对象数据到数据库表
public long addStudent(Student s) {
ContentValues values = new ContentValues();
values.put(TableContanst.StudentColumns.NAME, s.getName());
values.put(TableContanst.StudentColumns.AGE, s.getAge());
values.put(TableContanst.StudentColumns.SEX, s.getSex());
values.put(TableContanst.StudentColumns.LIKES, s.getLike());
values.put(TableContanst.StudentColumns.PHONE_NUMBER, s.getPhoneNumber());
values.put(TableContanst.StudentColumns.TRAIN_DATE, s.getTrainDate());
values.put(TableContanst.StudentColumns.MODIFY_TIME, s.getModifyDateTime());
return dbHelper.getWritableDatabase().insert(TableContanst.STUDENT_TABLE, null, values);
}
// 删除一个id所对应的数据库表student的记录
public int deleteStudentById(long id) {
return dbHelper.getWritableDatabase().delete(TableContanst.STUDENT_TABLE,
TableContanst.StudentColumns.ID + "=?", new String[] { id + "" });
}
// 更新一个id所对应数据库表student的记录
public int updateStudent(Student s) {
ContentValues values = new ContentValues();
values.put(TableContanst.StudentColumns.NAME, s.getName());
values.put(TableContanst.StudentColumns.AGE, s.getAge());
values.put(TableContanst.StudentColumns.SEX, s.getSex());
values.put(TableContanst.StudentColumns.LIKES, s.getLike());
values.put(TableContanst.StudentColumns.PHONE_NUMBER, s.getPhoneNumber());
values.put(TableContanst.StudentColumns.TRAIN_DATE, s.getTrainDate());
values.put(TableContanst.StudentColumns.MODIFY_TIME, s.getModifyDateTime());
return dbHelper.getWritableDatabase().update(TableContanst.STUDENT_TABLE, values,
TableContanst.StudentColumns.ID + "=?", new String[] { s.getId() + "" });
}
// 查询所有的记录
public List<Map<String,Object>> getAllStudents() {
//modify_time desc
List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null, null, null,
null, null, TableContanst.StudentColumns.MODIFY_TIME+" desc");
while(cursor.moveToNext()) {
Map<String, Object> map = new HashMap<String, Object>(8);
long id = cursor.getInt(cursor.getColumnIndex(TableContanst.StudentColumns.ID));
map.put(TableContanst.StudentColumns.ID, id);
String name = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.NAME));
map.put(TableContanst.StudentColumns.NAME, name);
int age = cursor.getInt(cursor.getColumnIndex(TableContanst.StudentColumns.AGE));
map.put(TableContanst.StudentColumns.AGE, age);
String sex = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.SEX));
map.put(TableContanst.StudentColumns.SEX, sex);
String likes = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.LIKES));
map.put(TableContanst.StudentColumns.LIKES, likes);
String phone_number = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.PHONE_NUMBER));
map.put(TableContanst.StudentColumns.PHONE_NUMBER, phone_number);
String train_date = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.TRAIN_DATE));
map.put(TableContanst.StudentColumns.TRAIN_DATE, train_date);
String modify_time = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.MODIFY_TIME));
map.put(TableContanst.StudentColumns.MODIFY_TIME, modify_time);
data.add(map);
}
return data;
}
//模糊查询一条记录
public Cursor findStudent(String name){
Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null, "name like ?",
new String[] { "%" + name + "%" }, null, null, null,null);
return cursor; }
//按姓名进行排序
public Cursor sortByName(){
Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
null, null, null,TableContanst.StudentColumns.NAME);
return cursor; }
//按入学日期进行排序
public Cursor sortByTrainDate(){
Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
null, null, null,TableContanst.StudentColumns.TRAIN_DATE);
return cursor;
}
//按学号进行排序
public Cursor sortByID(){
Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
null, null, null,TableContanst.StudentColumns.ID);
return cursor; }
public void closeDB() {
dbHelper.close(); } //自定义的方法通过View和Id得到一个student对象
public Student getStudentFromView(View view, long id) {
TextView nameView = (TextView) view.findViewById(R.id.tv_stu_name);
TextView ageView = (TextView) view.findViewById(R.id.tv_stu_age);
TextView sexView = (TextView) view.findViewById(R.id.tv_stu_sex);
TextView likeView = (TextView) view.findViewById(R.id.tv_stu_likes);
TextView phoneView = (TextView) view.findViewById(R.id.tv_stu_phone);
TextView dataView = (TextView) view.findViewById(R.id.tv_stu_traindate);
String name = nameView.getText().toString();
int age = Integer.parseInt(ageView.getText().toString());
String sex = sexView.getText().toString();
String like = likeView.getText().toString();
String phone = phoneView.getText().toString();
String data = dataView.getText().toString();
Student student = new Student(id, name, age, sex, like, phone, data,null);
return student;
}
}
- StudentDBHelper.java
package com.example.cungu.sqlitedemo;
import com.example.cungu.sqlitedemo.TableContanst;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class StudentDBHelper extends SQLiteOpenHelper {
private static final String TAG = "StudentDBHelper";
public static final String DB_NAME = "student_manager.db";
public static final int VERSION = 1; //构造方法
public StudentDBHelper(Context context, String name, CursorFactory factory, int version)
{
super(context, name, factory, version);
}
public StudentDBHelper(Context context) {
this(context, DB_NAME, null, VERSION); }
//创建数据库
@Override
public void onCreate(SQLiteDatabase db) {
Log.v(TAG, "onCreate");
db.execSQL("create table "
+ TableContanst.STUDENT_TABLE + "(_id Integer primary key AUTOINCREMENT,"
+ "name char,age integer, sex char, likes char, phone_number char,train_date date, "
+ "modify_time DATETIME)"); }
//更新数据库
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.v(TAG, "onUpgrade");
}
}
- 自定义类Student.java，用于封装student对象，从数据库中获得值；
package com.example.cungu.sqlitedemo;
import java.io.Serializable;
import android.view.View;
import android.widget.TextView;
public class Student implements Serializable{
private long id;
private String name;
private int age;
private String sex;
private String like;
private String phoneNumber;
private String trainDate;
private String modifyDateTime;
public Student() {
super();
}
public Student(long id, String name, int age, String sex, String like, String phoneNumber,
String trainDate, String modifyDateTime) {
super();
this.id = id;
this.name = name;
this.age = age;
this.sex = sex;
this.like = like;
this.phoneNumber = phoneNumber;
this.trainDate = trainDate;
this.modifyDateTime = modifyDateTime;
}
public Student(String name, int age, String sex, String like, String phoneNumber,
String trainDate, String modifyDateTime) {
super();
this.name = name;
this.age = age;
this.sex = sex;
this.like = like;
this.phoneNumber = phoneNumber;
this.trainDate = trainDate;
this.modifyDateTime = modifyDateTime;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex; }
public void setSex(String sex) {
this.sex = sex;
}
public String getLike() {
return like;
}
public void setLike(String like) {
this.like = like;
}
public String getPhoneNumber() {
return phoneNumber;
}
public void setPhoneNumber(String phoneNumber) {
this.phoneNumber = phoneNumber; }
public String getTrainDate() {
return trainDate;
}
public void setTrainDate(String trainDate) {
this.trainDate = trainDate;
}
public String getModifyDateTime() {
return modifyDateTime;
}
public void setModifyDateTime(String modifyDateTime) {
this.modifyDateTime = modifyDateTime;
}
}
8.自定义类 TableContanst.java，用于连接表：
package com.example.cungu.sqlitedemo;
public final class TableContanst {
public static final String STUDENT_TABLE = "student";
public static final class StudentColumns {
public static final String ID = "_id";
public static final String NAME = "name";
public static final String AGE = "age";
public static final String SEX = "sex";
public static final String LIKES = "likes";
public static final String PHONE_NUMBER = "phone_number";
public static final String TRAIN_DATE = "train_date";
public static final String MODIFY_TIME = "modify_time";
}
}
3.3 界面美化
引入图片和3种样式：
可以根据自己想法，自定义，下面给出我残次的参考样式：
- shape_button.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:shape="rectangle"
tools:ignore="MissingDefaultResource">
<solid android:color="#a1afc9" />
<stroke
android:width="1dip"
android:color="#ffffff" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<corners android:radius="200dp" />
shape>
- shape_button_white.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:shape="rectangle"
tools:ignore="MissingDefaultResource">
<solid android:color="#ffffff" />
<stroke
android:width="1dip"
android:color="#a1afc9" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<corners android:radius="200dp" />
shape>
- shape_edit.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<solid android:color="#ffffff" />
<stroke
android:width="1dip"
android:color="#ffffff" />
<padding
android:bottom="10dp"
android:left="10dp"
android:right="10dp"
android:top="10dp" />
<corners android:radius="6dp" />
shape>
项目大致如此~
总结：
- 这残次的UI真是分分钟想我想停掉手中的项目，强迫症星人一定要给自己
美化哦~- 项目中全选部分和给学生分配序号有待完善。
温馨提示：
如果每次调试安装没有手动卸载APP，数据库中的内容不会自动删除哦！好比如：之前创建了3个学生，即使全选删除了；未卸载之前的APP，直接第二次调试程序重装之后，创建学生，学生编号不会从1开始。所以，最好是手动卸载之前的APP、再重新安装哦！