Android 课程设计
基于Android平台的学生信息管理系统 1
一、系统需求分析 1
二、 系统设计 2
2.1系统模块设计 2
2.2 系统总体设计 2
2.3 系统数据库设计 2
（学生信息表） 2
（课程信息表） 2
（成绩信息表） 3
三、 系统详细设计与实现 3
3.1 主界面 3
3.2学生信息界面 5
3.3 课程信息界面 10
3.4 成绩信息界面 14
四、 系统测试 17
4.1 测试 17
4.2 测试结果 17
五、 体验心得 18
附件 Java主要源代码 19
基于Android平台的学生信息管理系统
一、系统需求分析
随着学校的规模不断扩大，学生数量急剧增加，有关学生的各种信息量也成倍增长。面对庞大的信息量需要有学生管理系统来提高学生管理工作的效率。通过这样的系统可以做到信息的规范管理、科学统计和快速查询、修改、增加、删除等，从而减少管理方面的工作量。
本系统主要用于学校学生信息管理，总体任务是实现学生信息关系的系统化、规范化和自动化，其主要任务是用计算机对学生各种信息进行日常管理，如查询、修改 、增加、删除。
开发学生信息管理系统手机客户端旨在方便管理学生信息，使同学android智能手机就可以管理学生信息，真正做到互联网的全方位覆盖。管理学生信息系统适用于具有android智能手机的用户，在使用本软件后，学生信息管理将更加方便快捷。
1.2用例分析
1.3数据逻辑模型
二、系统设计
2.1系统模块设计
根据对系统的需求分析，本系统将分为3个模块：
l 学生信息：
管理学生的基本信息，包括个人信息的添加、修改、删除。
l 课程信息：
管理课程的基本信息，包括课程信息的添加、修改和删除。
l 成绩信息：
管理学生的选课的成绩信息，包括成绩的登记与修改。
2.2 系统总体设计
学生信息管理系统E-R图
2.3 系统数据库设计
（学生信息表）
|
字段名 |
数据类型 |
长度 |
主键 |
索引 |
外键 |
可空 |
说明 |
|
sncm |
int |
9 |
是 |
|
否 |
否 |
学 号 |
|
sname |
Varchar |
20 |
否 |
|
否 |
否 |
学生姓名 |
|
ssex |
Vachar |
10 |
否 |
|
否 |
否 |
性 别 |
|
sage |
varchar |
10 |
否 |
|
否 |
否 |
年 龄 |
|
sphone |
Varchar |
11 |
否 |
|
否 |
否 |
手机号 |
（课程信息表）
|
字段名 |
数据类型 |
长度 |
主键 |
索引 |
外键 |
可空 |
说明 |
|
cnum |
varchar(10) |
10 |
是 |
|
否 |
否 |
课程编码 |
|
cname |
Varchar |
20 |
否 |
|
否 |
否 |
课程名称 |
|
credit |
Smallint |
10 |
否 |
|
否 |
否 |
学 分 |
（成绩信息表）
|
字段名 |
数据类型 |
长度 |
主键 |
索引 |
外键 |
可空 |
说明 |
|
sncm |
int |
9 |
是 |
|
否 |
否 |
学 号 |
|
cnum |
varchar(10) |
10 |
否 |
|
否 |
否 |
课程编码 |
|
score |
int |
10 |
否 |
|
否 |
否 |
分 数 |
三、系统详细设计与实现
3.1 主界面
运行程序后会进入主界面，主界面可以选择进入学生信息模块、课程信息模块以及成绩信息模块（直接点击进行跳转），方便操作，程序的主要功能一目了然。
主要代码
<Button
android:id="@+id/students"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="115dp"
android:text="学 生 信 息" />
<TextView
android:id="@+id/home_xinxi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="40dp"
android:text="学生成绩管理系统"
android:textAppearance="?android:attr/textAppearanceLarge" />
<Button
android:id="@+id/cs"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/courses"
android:layout_below="@+id/courses"
android:layout_marginTop="36dp"
android:text="成 绩 信 息" />
<Button
android:id="@+id/courses"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/students"
android:layout_below="@+id/students"
android:layout_marginTop="30dp"
android:text="课 程 信 息" />
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.student_layout);
setTitle("学生信息管理");
search = (Button) this.findViewById(R.id.search_student_button);
search_text = (EditText) this.findViewById(R.id.to_search_student);
listView = (ListView) findViewById(R.id.student_listview);
add_student = (Button) this.findViewById(R.id.add_student);
delete_student = (Button) this.findViewById(R.id.delete_student);
db = new MyDB(StudentsActivity.this);
updatelistview();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
ListView myListView=(ListView)parent;
HashMap<String, Object> item=(HashMap<String, Object>)myListView.getItemAtPosition(position);
popview(item,"modify");//添加弹出窗口
}
});
search.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
updatelistview();
}
});
3.2学生信息界面
学生信息界面主要显示学生的信息，可以在此界面对学生的信息进行查询、添加、删除和修改。
添加时直接点击添加，会弹出添加界面，进行添加即可
查询时搜索学号即可查询信息
删除时输入学号进行删除
修改时点击信息会弹出界面，直接进行修改即可
主要代码
<LinearLayout
android:id="@+id/nono"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/lll"
android:layout_width="100dp"
android:layout_height="40dp"
android:text="搜 索 学 号:" />
<EditText
android:id="@+id/to_search_student"
android:layout_width="160dp"
android:layout_height="40dp"
android:ems="10"
android:inputType="number" />
<Button
android:id="@+id/search_student_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/delete_student"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="删 除" />
<Button
android:id="@+id/add_student"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="添 加" />
</LinearLayout>
<LinearLayout
android:id="@+id/stu_head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/student_view_snum"
android:layout_width="80dp"
android:layout_height="30dp"
android:text="学 号" />
<TextView
android:id="@+id/student_view_sname"
android:layout_width="50dp"
android:layout_height="30dp"
android:text="姓名"/>
<TextView
android:id="@+id/student_view_ssex"
android:layout_width="30dp"
android:layout_height="30dp"
android:text="性别" />
<TextView
android:id="@+id/student_view_sage"
android:layout_width="50dp"
android:layout_height="30dp"
android:text="年 龄" />
<TextView
android:id="@+id/student_view_sphone"
android:layout_width="100dp"
android:layout_height="30dp"
android:text="电 话" />
</LinearLayout>
public void AddStudent(Student student) {
String sql ="insert into Students (Snum, Sname, Ssex, Sage, Sphone) values (?, ?, ?, ?, ?)";
Object[] bindArgs = { student.getSnum(), student.getSname(), student.getSsex(), student.getSage(), student.getSphone()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void delStudents(String snumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Students where Snum = ?";//删students表中的某个学生
Object[] bindArgs = {snumber};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS where Snum = ?";//删CS成绩表中该学生的全部成绩
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delALLStudents(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Students ";//删students表中的某个学生
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS ";//删CS成绩表中该学生的全部成绩
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void updateStudent(Student student){
String sql = "update Students set Sname = ?, Ssex = ?, Sage = ?, Sphone = ? where Snum = ?";
Object[] bindArgs = {student.getSname(),
student.getSsex(),student.getSage(),student.getSphone(), student.getSnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
public List<Student> findALLStudent(){
String sql = "select * from Students order by Snum asc";
String[] selectionArgs = {};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<Student> students =new ArrayList<Student>();
while(cursor.moveToNext()){
Student student = new Student(cursor.getString(0), cursor.getString(1),
cursor.getString(2), cursor.getInt(3), cursor.getString(4));
students.add(student);
}
return students;
}
public Student findStudent(String snumber){
String sql = "select * from Students where Snum = ?";
String[] selectionArgs = {snumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
if(cursor.moveToFirst()){
return new Student(cursor.getString(0), cursor.getString(1),
cursor.getString(2), cursor.getInt(3), cursor.getString(4));
}
return null;
3.3 课程信息界面
课程信息界面可以查看课程信息，进行课程编码、课程名称、课程学分的增删改查。
添加课程信息：过程和学生信息的一样
删除课程信息
修改课程信息
主要代码
<LinearLayout
android:id="@+id/nono"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/ccc"
android:layout_width="100dp"
android:layout_height="40dp"
android:text="搜索课程编码:" />
<EditText
android:id="@+id/to_search_Course"
android:layout_width="160dp"
android:layout_height="40dp"
android:ems="10"/>
<Button
android:id="@+id/search_course_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/delete_course"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="删 除" />
<Button
android:id="@+id/add_course"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="添 加" />
</LinearLayout>
<LinearLayout
android:id="@+id/stu_head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/course_view_cnum"
android:layout_width="108dp"
android:layout_height="30dp"
android:text="课程编码" />
<TextView
android:id="@+id/course_view_cname"
android:layout_width="112dp"
android:layout_height="30dp"
android:text="课程名称" />
<TextView
android:id="@+id/course_view_credit"
android:layout_width="56dp"
android:layout_height="30dp"
android:text="学 分" />
</LinearLayout>
public void AddCourse(Course course) {
String sql ="insert into Courses (Cnum, Cname, Ccredit) values (?, ?, ?)";
Object[] bindArgs = {course.getCnum(),course.getCname(),course.getCcredit()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void delCourse(String cnumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Courses where Cnum = ?";
Object[] bindArgs = {cnumber};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS where Cnum = ?";
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delALLCourse(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Courses";
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS";
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void updateCourse(Course course){
String sql = "update Courses set Cname = ?, Ccredit = ? where Cnum = ? ";
Object[] bindArgs = {course.getCname(), course.getCcredit(), course.getCnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
3.4 成绩信息界面
成绩界面可以查看学生的成绩，学生的成绩以学号＋课程编码＋分数的形式显示。同样的，在这个界面同样可以对学生的成绩信息进行增删改查。
增加学生成绩信息；
删除学生成绩信息；
修改学生成绩信息；
主要代码
<LinearLayout
android:id="@+id/llllbn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/bfgbfd"
android:layout_width="100dp"
android:layout_height="40dp"
android:text="学号+课程编码:" />
<EditText
android:id="@+id/to_search_CS_S"
android:layout_width="80dp"
android:layout_height="40dp"
android:ems="5"
android:inputType="number" />
<EditText
android:id="@+id/to_search_CS_C"
android:layout_width="80dp"
android:layout_height="40dp"
android:ems="5"/>
<Button
android:id="@+id/search_cs_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="查询" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/delete_cs"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="删 除" />
<Button
android:id="@+id/add_cs"
android:layout_width="160dp"
android:layout_height="wrap_content"
android:layout_weight="0.79"
android:text="添 加" />
</LinearLayout>
<LinearLayout
android:id="@+id/cs_head"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:id="@+id/cs_view_snum"
android:layout_width="108dp"
android:layout_height="30dp"
android:text="学号" />
<TextView
android:id="@+id/cs_view_cnum"
android:layout_width="112dp"
android:layout_height="30dp"
android:text="课程编码" />
<TextView
android:id="@+id/cs_view_score"
android:layout_width="56dp"
android:layout_height="30dp"
android:text="分数" />
public void AddCS(CS cs) throws Exception {
if(findStudent(cs.getSnum()) != null && findCourse(cs.getCnum()) != null){
String sql ="insert into CS (Snum, Cnum, Score) values (?, ?, ?)";
Object[] bindArgs = {cs.getSnum(),cs.getCnum(),cs.getScore()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
else{
throw new Exception("can't add this score");
}
}
public void delCS(String snumber,String cnumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from CS where Snum = ? and Cnum = ?";
Object[] bindArgs = {snumber,cnumber};
db.execSQL(sql, bindArgs);
}
public void delALLCS(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from CS";
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
}
public void updateCS(CS cs){
String sql = "update CS set Score = ? where Snum = ? and Cnum = ?";
Object[] bindArgs = {cs.getScore(), cs.getSnum(),cs.getCnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
四、系统测试
4.1 测试
1.测试系统能否正常运行
2.测试数据库能否顺利连接
3.测试系统各个页面能否正常跳转
4.测试增删改查功能能否正常使用
5.测试学生信息是否正常显示
4.2 测试结果
系统能够正常运行；数据库顺利连接；页面跳转正常；增删改查能够正常使用；学生信息显示正常。
五、体验心得
通过这次的程序设计，我学到了很多，首先就是能够更加熟练的使用和深入的了解Java语言这门通用的计算机语言，还有就是可以自己编写程序了，还是很有成就感的。还有就是光靠书本的知识的确不行，还是要理论联系实践才行。因此不断的练习是必要的，上机实践更重要。通过这次的程序编写让我对编程产生了更大的兴趣，我相信以后我们都会越来越好的。
我从一开始的懵懂到现在的有点理解可以说和老师的教导分不开的。虽然俗语说师傅领进门，修行靠个人，所以师傅的作用还是不可取代的，以前上课时老师教的代码给了我很大的帮助，非常感谢老师！
附件 Java主要源代码
StudentActivity.java(对学生信息界面的操作)：
public class StudentsActivity extends Activity{
private Button search = null;
private EditText search_text = null;
private ListView listView = null;
private MyDB db = null;
private Button add_student = null;
private Button delete_student = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.student_layout);
setTitle("学生信息管理");
search = (Button) this.findViewById(R.id.search_student_button);
search_text = (EditText) this.findViewById(R.id.to_search_student);
listView = (ListView) findViewById(R.id.student_listview);
add_student = (Button) this.findViewById(R.id.add_student);
delete_student = (Button) this.findViewById(R.id.delete_student);
db = new MyDB(StudentsActivity.this);
updatelistview();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
ListView myListView=(ListView)parent;
HashMap<String, Object> item=(HashMap<String, Object>)myListView.getItemAtPosition(position);
popview(item,"modify");//添加弹出窗口
}
});
search.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
updatelistview();
}
});
add_student.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
HashMap<String, Object> item = null;
popview(item, "add");
}
});
delete_student.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if(search_text.getText().toString().equals("0000")){
db.delALLStudents();
}
else{
db.delStudents(search_text.getText().toString());
}
search_text.setText("");
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(StudentsActivity.this, "delete student error!" , Toast.LENGTH_SHORT).show();
}
}
});
}
private void popview(HashMap<String, Object> item,final String mode) {
// 取得自定义View
try {
LayoutInflater layoutInflater = LayoutInflater.from(StudentsActivity.this);
View myLoginView = layoutInflater.inflate(R.layout.student_edit, null);
final EditText modify_snum = (EditText) myLoginView.findViewById(R.id.modify_snum_txt);
final EditText modify_sname = (EditText) myLoginView.findViewById(R.id.modify_sname_txt);
final EditText modify_sage = (EditText) myLoginView.findViewById(R.id.modify_sage_txt);
final EditText modify_sphone = (EditText) myLoginView.findViewById(R.id.modify_sphone_txt);
final RadioButton maleButton = (RadioButton) myLoginView.findViewById(R.id.radio_button_male);
final RadioButton femaleButton = (RadioButton) myLoginView.findViewById(R.id.radio_button_female);
modify_snum.setText("");
modify_sname.setText("");
modify_sage.setText("0");
modify_sphone.setText("");
modify_snum.setEnabled(true);
if(mode.equals("modify")){
modify_snum.setText(item.get("Snum").toString());
modify_snum.setEnabled(false);
modify_sname.setText(item.get("Sname").toString());
modify_sage.setText(item.get("Sage").toString());
modify_sphone.setText(item.get("Sphone").toString());
if(item.get("Ssex").toString().equals("男")){
maleButton.setChecked(true);
}
else{
femaleButton.setChecked(true);
}
}
Dialog alertDialog = new AlertDialog.Builder(StudentsActivity.this).
setView(myLoginView).
setPositiveButton("确认", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
try {
String snum = modify_snum.getText().toString() ;
String sname = modify_sname.getText().toString();
String sphone = modify_sphone.getText().toString();
int sage = Integer.valueOf(modify_sage.getText().toString());
String ssex = "女";
if(maleButton.isChecked()){
ssex = "男";
}
if(snum.equals("")){
Toast.makeText(StudentsActivity.this, "can't add a student without Snum!", Toast.LENGTH_SHORT).show();
return;
}
Student student = new Student(snum, sname , ssex , sage, sphone);
if(mode.equals("modify")){
db.updateStudent(student);
updatelistview();
}
else{
try {
db.AddStudent(student);
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(StudentsActivity.this, "add student error", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(StudentsActivity.this, "update student error", Toast.LENGTH_SHORT).show();
}
}
}).
setNegativeButton("撤销", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(StudentsActivity.this, "", Toast.LENGTH_SHORT).show();
}
}).
create();
alertDialog.show();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(StudentsActivity.this, "runing wrong!", Toast.LENGTH_SHORT).show();
}
}
private void updatelistview() {
try {
String string = search_text.getText().toString();
List<Student> students = new ArrayList<Student>();
List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
if(!string.equals("")){
Student student = db.findStudent(string);
students.add(student);
}
else {
students = db.findALLStudent();
}
Iterator<Student> it = students.iterator();
while(it.hasNext()){
HashMap<String, Object> hashMap=new HashMap<String, Object>();
Student student = it.next();
hashMap.put("Snum",student.getSnum() );
hashMap.put("Sname",student.getSname() );
hashMap.put("Ssex",student.getSsex() );
hashMap.put("Sage",student.getSage() );
hashMap.put("Sphone",student.getSphone() );
data.add(hashMap);
}
SimpleAdapter adapter=
new SimpleAdapter(StudentsActivity.this, data, R.layout.student_view,
new String[]{"Snum","Sname","Ssex","Sage","Sphone"},
new int[]{R.id.student_view_snum,R.id.student_view_sname,R.id.student_view_ssex,R.id.student_view_sage,R.id.student_view_sphone});
listView.setAdapter(adapter);
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(StudentsActivity.this, "can't find this student!" , Toast.LENGTH_SHORT).show();
}
}
}
CourseActivity.java（对学生信息界面的操作）：
public class CourseActivity extends Activity {
private Button search = null;
private EditText search_text = null;
private ListView listView = null;
private MyDB db = null;
private Button add_course = null;
private Button delete_course = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.course_layout);
setTitle("课程信息管理");
search = (Button) this.findViewById(R.id.search_course_button);
search_text = (EditText) this.findViewById(R.id.to_search_Course);
listView = (ListView) findViewById(R.id.course_listview);
add_course = (Button) this.findViewById(R.id.add_course);
delete_course = (Button) this.findViewById(R.id.delete_course);
db = new MyDB(CourseActivity.this);
updatelistview();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
ListView myListView=(ListView)parent;
HashMap<String, Object> item=(HashMap<String, Object>)myListView.getItemAtPosition(position);
popview(item,"modify");//添加弹出窗口
}
});
search.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
updatelistview();
}
});
add_course.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
HashMap<String, Object> item = null;
popview(item, "add");
}
});
delete_course.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if(search_text.getText().toString().equals("0000")){
db.delALLCourse();
}
else{
db.delCourse(search_text.getText().toString());
}
search_text.setText("");
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CourseActivity.this, "delete course error!" , Toast.LENGTH_SHORT).show();
}
}
});
}
private void popview(HashMap<String, Object> item,final String mode) {
// 取得自定义View
try {
LayoutInflater layoutInflater = LayoutInflater.from(CourseActivity.this);
View myLoginView = layoutInflater.inflate(R.layout.course_edit, null);
final EditText modify_cnum = (EditText) myLoginView.findViewById(R.id.modify_cnum_txt);
final EditText modify_cname = (EditText) myLoginView.findViewById(R.id.modify_cname_txt);
final EditText modify_credit = (EditText) myLoginView.findViewById(R.id.modify_credit_txt);
modify_cnum.setText("");
modify_cname.setText("");
modify_credit.setText("0");
modify_cnum.setEnabled(true);
if(mode.equals("modify")){
modify_cnum.setText(item.get("Cnum").toString());
modify_cnum.setEnabled(false);
modify_cname.setText(item.get("Cname").toString());
modify_credit.setText(item.get("Ccredit").toString());
}
Dialog alertDialog = new AlertDialog.Builder(CourseActivity.this).
setView(myLoginView).
setPositiveButton("确认", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
try {
String cnum = modify_cnum.getText().toString() ;
String cname = modify_cname.getText().toString();
float credit = Float.valueOf(modify_credit.getText().toString());
if(cnum.equals("")){
Toast.makeText(CourseActivity.this, "can't add a course without Cnum!", Toast.LENGTH_SHORT).show();
return;
}
Course course = new Course(cnum, cname, credit);
if(mode.equals("modify")){
db.updateCourse(course);
updatelistview();
}
else{
try {
db.AddCourse(course);
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CourseActivity.this, "add course error", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CourseActivity.this, "update course error", Toast.LENGTH_SHORT).show();
}
}
}).
setNegativeButton("撤销", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(CourseActivity.this, "", Toast.LENGTH_SHORT).show();
}
}).
create();
alertDialog.show();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CourseActivity.this, "runing wrong!", Toast.LENGTH_SHORT).show();
}
}
private void updatelistview() {
try {
String string = search_text.getText().toString();
List<Course> courses = new ArrayList<Course>();
List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
if(!string.equals("")){
Course course = db.findCourse(string);
courses.add(course);
}
else {
courses = db.findALLCourse();
}
Iterator<Course> it = courses.iterator();
while(it.hasNext()){
HashMap<String, Object> hashMap=new HashMap<String, Object>();
Course course = it.next();
hashMap.put("Cnum",course.getCnum());
hashMap.put("Cname",course.getCname());
hashMap.put("Ccredit",course.getCcredit());
data.add(hashMap);
}
SimpleAdapter adapter=
new SimpleAdapter(CourseActivity.this, data, R.layout.course_view,
new String[]{"Cnum","Cname","Ccredit"},
new int[]{R.id.course_view_cnum,R.id.course_view_cname,R.id.course_view_credit});
listView.setAdapter(adapter);
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CourseActivity.this, "can't find this course!" , Toast.LENGTH_SHORT).show();
}
}
}
CSActivity.java（对成绩信息界面的操作）：
public class CSActivity extends Activity {
private Button search = null;
private EditText search_s = null;
private EditText search_c = null;
private ListView listView = null;
private MyDB db = null;
private Button add_cs = null;
private Button delete_cs = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.cs_layout);
setTitle("成绩信息管理");
search = (Button) this.findViewById(R.id.search_cs_button);
search_s = (EditText) this.findViewById(R.id.to_search_CS_S);
search_c = (EditText) this.findViewById(R.id.to_search_CS_C);
listView = (ListView) findViewById(R.id.cs_listview);
add_cs = (Button) this.findViewById(R.id.add_cs);
delete_cs = (Button) this.findViewById(R.id.delete_cs);
db = new MyDB(CSActivity.this);
updatelistview();
listView.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
ListView myListView=(ListView)parent;
HashMap<String, Object> item=(HashMap<String, Object>)myListView.getItemAtPosition(position);
popview(item,"modify");//添加弹出窗口
}
});
search.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
updatelistview();
}
});
add_cs.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
HashMap<String, Object> item = null;
popview(item, "add");
}
});
delete_cs.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if(search_s.getText().toString().equals("0000")){
db.delALLCourse();
}
else{
db.delCS(search_s.getText().toString(), search_c.getText().toString());
//(search_text.getText().toString());
}
search_s.setText("");
search_c.setText("");
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CSActivity.this, "delete score error!" , Toast.LENGTH_SHORT).show();
}
}
});
}
private void popview(HashMap<String, Object> item,final String mode) {
// 取得自定义View
try {
LayoutInflater layoutInflater = LayoutInflater.from(CSActivity.this);
View myLoginView = layoutInflater.inflate(R.layout.cs_edit, null);
final EditText modify_snum = (EditText) myLoginView.findViewById(R.id.modify_snum_txt);
final EditText modify_cnum = (EditText) myLoginView.findViewById(R.id.modify_cnum_txt);
final EditText modify_score = (EditText) myLoginView.findViewById(R.id.modify_score_txt);
modify_snum.setText("");
modify_cnum.setText("");
modify_score.setText("0");
modify_snum.setEnabled(true);
modify_cnum.setEnabled(true);
if(mode.equals("modify")){
modify_snum.setText(item.get("Snum").toString());
modify_snum.setEnabled(false);
modify_cnum.setEnabled(false);
modify_cnum.setText(item.get("Cnum").toString());
modify_score.setText(item.get("Score").toString());
}
Dialog alertDialog = new AlertDialog.Builder(CSActivity.this).
setView(myLoginView).
setPositiveButton("确认", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
try {
String snum = modify_snum.getText().toString() ;
String cnum = modify_cnum.getText().toString();
float score = Float.valueOf(modify_score.getText().toString());
if(snum.equals("") || cnum.equals("")){
Toast.makeText(CSActivity.this, "can't add a score without Snum & Cnum!", Toast.LENGTH_SHORT).show();
return;
}
// Student student = new Student(snum, sname , ssex , sage, sphone);
CS cs = new CS(snum, cnum, score);
if(mode.equals("modify")){
db.updateCS(cs);
updatelistview();
}
else{
try {
db.AddCS(cs);
updatelistview();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CSActivity.this, "add score error", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CSActivity.this, "update score error", Toast.LENGTH_SHORT).show();
}
}
}).
setNegativeButton("撤销", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(CSActivity.this, "", Toast.LENGTH_SHORT).show();
}
}).
create();
alertDialog.show();
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CSActivity.this, "runing wrong!", Toast.LENGTH_SHORT).show();
}
}
private void updatelistview() {
try {
String s = search_s.getText().toString();
String c = search_c.getText().toString();
List<CS> Css = new ArrayList<CS>();
List<HashMap<String, Object>> data1 = new ArrayList<HashMap<String,Object>>();
if(s.equals("") && c.equals("")){
Css = db.findALLCS();
}
else if(s.equals("") && (!c.equals(""))){
Css = db.findCSbyCnum(c);
}
else if((!s.equals("")) && c.equals("")){
Css = db.findCSbySnum(s);
}else{
CS cs = db.findCS(c, s);
Css.add(cs);
}
Iterator<CS> it = Css.iterator();
int i = 0;
while(it.hasNext()){
HashMap<String, Object> hashMap=new HashMap<String, Object>();
CS cs = it.next();
hashMap.put("Snum",cs.getSnum() );
hashMap.put("Cnum",cs.getCnum() );
hashMap.put("Score",cs.getScore() );
data1.add(hashMap);
i = i+1;
}
Toast.makeText(CSActivity.this, "一共："+i , Toast.LENGTH_SHORT).show();
SimpleAdapter adapter=
new SimpleAdapter(CSActivity.this, data1, R.layout.cs_view,
new String[]{"Snum","Cnum","Score"},
new int[]{R.id.cs_view_snum,R.id.cs_view_cnum,R.id.cs_view_score});
listView.setAdapter(adapter);
} catch (Exception e) {
// TODO: handle exception
Toast.makeText(CSActivity.this, "can't find this score!" , Toast.LENGTH_SHORT).show();
}
}
}
MyDBhelper.java（创建数据库）：
public class MyDBhelper extends SQLiteOpenHelper{
private static final String name="contants";//数据库名称
private static final int version= 1;//数据库版本
public MyDBhelper(Context context) {
super(context, name, null, version);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
String students = "create table if not exists Students (Snum varchar(10) primary key, Sname varchar(6), Ssex varchar(2), Sage integer(3), Sphone varchar(12))";
String courses = "create table if not exists Courses (Cnum varchar(4) primary key, Cname varchar(10), Ccredit real(3))";
String cs = "create table if not exists CS (Snum varchar(10) , Cnum varchar(4), Score real(3), primary key (Snum,Cnum)) ";
Object[] bindArgs = {};
db.execSQL(students, bindArgs);
db.execSQL(courses, bindArgs);
db.execSQL(cs, bindArgs);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS Students");
db.execSQL("DROP TABLE IF EXISTS Courses");
db.execSQL("DROP TABLE IF EXISTS CS");
this.onCreate(db);
}
}
MyDB.java（对数据库进行增删改查）：
public class MyDB{
private MyDBhelper dBhelper;
private SQLiteDatabase mydb;
public MyDB(Context context) {
// TODO Auto-generated constructor stub
this.dBhelper = new MyDBhelper(context);
}
/*增*/
public void AddStudent(Student student) {
String sql ="insert into Students (Snum, Sname, Ssex, Sage, Sphone) values (?, ?, ?, ?, ?)";
Object[] bindArgs = { student.getSnum(), student.getSname(), student.getSsex(), student.getSage(), student.getSphone()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void AddCourse(Course course) {
String sql ="insert into Courses (Cnum, Cname, Ccredit) values (?, ?, ?)";
Object[] bindArgs = {course.getCnum(),course.getCname(),course.getCcredit()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void AddCS(CS cs) throws Exception {
if(findStudent(cs.getSnum()) != null && findCourse(cs.getCnum()) != null){
String sql ="insert into CS (Snum, Cnum, Score) values (?, ?, ?)";
Object[] bindArgs = {cs.getSnum(),cs.getCnum(),cs.getScore()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
else{
throw new Exception("can't add this score");
}
}
/*删*/
public void delStudents(String snumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Students where Snum = ?";//删students表中的某个学生
Object[] bindArgs = {snumber};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS where Snum = ?";//删CS成绩表中该学生的全部成绩
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delALLStudents(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Students ";//删students表中的某个学生
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS ";//删CS成绩表中该学生的全部成绩
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delCourse(String cnumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Courses where Cnum = ?";
Object[] bindArgs = {cnumber};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS where Cnum = ?";
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delALLCourse(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from Courses";
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
try {
sql = "delete from CS";
db.execSQL(sql, bindArgs);
} catch (Exception e) {
// TODO: handle exception
}
}
public void delCS(String snumber,String cnumber){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from CS where Snum = ? and Cnum = ?";
Object[] bindArgs = {snumber,cnumber};
db.execSQL(sql, bindArgs);
}
public void delALLCS(){
SQLiteDatabase db = this.dBhelper.getWritableDatabase();
String sql = "delete from CS";
Object[] bindArgs = {};
db.execSQL(sql, bindArgs);
}
/*改*/
public void updateStudent(Student student){
String sql = "update Students set Sname = ?, Ssex = ?, Sage = ?, Sphone = ? where Snum = ?";
Object[] bindArgs = {student.getSname(),
student.getSsex(),student.getSage(),student.getSphone(), student.getSnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void updateCourse(Course course){
String sql = "update Courses set Cname = ?, Ccredit = ? where Cnum = ? ";
Object[] bindArgs = {course.getCname(), course.getCcredit(), course.getCnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
public void updateCS(CS cs){
String sql = "update CS set Score = ? where Snum = ? and Cnum = ?";
Object[] bindArgs = {cs.getScore(), cs.getSnum(),cs.getCnum()};
mydb = this.dBhelper.getWritableDatabase();
mydb.execSQL(sql, bindArgs);
}
/*查*/
public Student findStudent(String snumber){
String sql = "select * from Students where Snum = ?";
String[] selectionArgs = {snumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
if(cursor.moveToFirst()){
return new Student(cursor.getString(0), cursor.getString(1),
cursor.getString(2), cursor.getInt(3), cursor.getString(4));
}
return null;
}
public Course findCourse(String cnumber){
String sql = "select * from Courses where Cnum = ?";
String[] selectionArgs = {cnumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
if(cursor.moveToFirst()){
return new Course(cursor.getString(0),cursor.getString(1), cursor.getFloat(2));
}
return null;
}
public CS findCS(String cnumber,String snumber){
String sql = "select * from CS where Snum = ? and Cnum = ?";
String[] selectionArgs = {snumber ,cnumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
if(cursor.moveToFirst()){
return new CS(cursor.getString(0), cursor.getString(1), cursor.getFloat(2));
}
return null;
}
public List<CS> findCSbyCnum(String cnumber){
String sql = "select * from CS where Cnum = ?";
String[] selectionArgs = {cnumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<CS> css = new ArrayList<CS>();
while(cursor.moveToNext()){
CS cs1 = new CS(cursor.getString(0),cursor.getString(1), cursor.getFloat(2));
css.add(cs1);
}
return css;
}
public List<CS> findCSbySnum(String snumber){
String sql = "select * from CS where Snum = ?";
String[] selectionArgs = {snumber};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<CS> css = new ArrayList<CS>();
while(cursor.moveToNext()){
CS cs1 = new CS(cursor.getString(0),cursor.getString(1), cursor.getFloat(2));
css.add(cs1);
}
return css;
}
/*findALL函数*/
public List<Student> findALLStudent(){
String sql = "select * from Students order by Snum asc";
String[] selectionArgs = {};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<Student> students =new ArrayList<Student>();
while(cursor.moveToNext()){
Student student = new Student(cursor.getString(0), cursor.getString(1),
cursor.getString(2), cursor.getInt(3), cursor.getString(4));
students.add(student);
}
return students;
}
public List<Course> findALLCourse(){
String sql = "select * from Courses order by Cnum asc";
String[] selectionArgs = {};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<Course> courses = new ArrayList<Course>();
while(cursor.moveToNext()){
Course course = new Course(cursor.getString(0),cursor.getString(1), cursor.getFloat(2));
courses.add(course);
}
return courses;
}
public List<CS> findALLCS(){
String sql = "select * from CS order by Snum asc";
String[] selectionArgs = {};
mydb = this.dBhelper.getReadableDatabase();
Cursor cursor = mydb.rawQuery(sql, selectionArgs);
List<CS> css = new ArrayList<CS>();
while(cursor.moveToNext()){
CS cs1 = new CS(cursor.getString(0),cursor.getString(1), cursor.getFloat(2));
css.add(cs1);
}
return css；
