老师用户的功能实现:更改密码,更改个人信息,还有事给自己班级对于课程名称的学生录入成绩
之前一篇分享过学生的更改密码和个人信息,老师的操作与它相似,这里不重复。
对于录入成绩。需要显示的有那个学生,他的学号是什么,还有他的成绩,因为这些都是不定的,而且是从数据库中读取的,所以需要使用到一个ListVIew来显示这些数据,ListView的显示需要使用到相关条目和适配器,我的是自定义的适配器,当然大家可以使用SimpleAdapter,这样更简单,不过我只是想试一下自己能否自定义适配器使用而已。
TeacherMainActivity的代码:
public class TeacherMainFrame extends Activity { private Intent intent; private ListView teachet_listview; private DataBaSEOpenHelper helper; private Button sure_score; private LinearLayout showStudentPartMessage; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.teacher_main_frame); teachet_listview = (ListView) findViewById(R.id.teachet_listview); helper = new DataBaSEOpenHelper(this); sure_score = (Button)findViewById(R.id.sure_score); showStudentPartMessage = (LinearLayout)findViewById(R.id.showStudentPartMessage); } /** * 统一使用这个点击事件名称管理在老师主界面的各个点击事件按,学生和管理员中也是类似 * @param v */ public void check_message_teacher(View v) { switch (v.getId()) { case R.id.change_password_teacher://切换至更改老师密码界面 Intent intentFromTeacher = getIntent(); String teacherName = intentFromTeacher .getStringExtra("teacherName");//教师号是外码,传递之后用于查询密码表中对于教师号的密码 intent = new Intent(TeacherMainFrame.this,TeacherChangePassword.class); intent.putExtra("teacherName",teacherName); startActivityForResult(intent,1); break; case R.id.chekSelfMessage_teacher://切换至更改老师个人信息界面 Intent intentFromTeacher2 = getIntent(); String teacherName2 = intentFromTeacher2 .getStringExtra("teacherName");//教师号是外码,不能够改变,所以需要在在个人信息中使用一个TextView来显示 intent = new Intent(TeacherMainFrame.this,TeacherMessageActivity.class); intent.putExtra("name",teacherName2); startActivity(intent); break; case R.id.change_green_teacher://给自己班级所教科目的学生入炉成绩 teachet_listview.setVisibility(View.VISIBLE); sure_score.setVisibility(View.VISIBLE); showStudentPartMessage.setVisibility(View.VISIBLE); change_score_teacher(); break; } } /** * 录入成绩 */ private void change_score_teacher() { Intent intentFromTeacher = getIntent(); String teacherName = intentFromTeacher.getStringExtra("teacherName"); sqliteDatabase db = helper.getWritableDatabase(); Cursor cursor = db.rawQuery( "select T_Class_name from allteachermessage where Tno=?",new String[] { teacherName });//查询教师的个人信息 if (cursor.moveToFirst()) { String T_Class_name = cursor.getString(cursor .getColumnIndex("T_Class_name")); Cursor cursorscore = db .rawQuery( "select allstudentmessage.name,allstudentmessage.Sno " + "from allstudentmessage,allteachermessage,dbS_C " + "where allstudentmessage.[classIn]=allteachermessage.T_Class " + "AND dbS_C.s_name=allstudentmessage.Sno " + "AND dbS_C.c_name=allteachermessage.T_Class_name" + " AND allteachermessage.[T_Class_name]=?",new String[] { T_Class_name });//查询老师所教班级对于自己所教科目的学生的学号,姓名两类信息 cursor.close(); List<Map<String,Object>> items = new ArrayList<Map<String,Object>>();//存放自己所教学生的信息的集合 while (cursorscore.moveToNext()) { String S_no = cursorscore.getString(cursorscore .getColumnIndex("allstudentmessage.Sno")); String name = cursorscore.getString(cursorscore .getColumnIndex("allstudentmessage.name")); Map<String,Object> item = new HashMap<String,Object>(); item.put("name",name);//学生的姓名 item.put("S_no",S_no);//学生的学号 item.put("score",0 + "");//学生默认成绩0 items.add(item);//添加到集合汇总 }<pre name="code" class="java">
//SimpleAdapter adapter = new SimpleAdapter(this,items,R.layout.itm_teacher_for_score,new String[]{"name","S_no","score"},new int[]{R.id.teacher_Sname,R.id.teacher_Sno,R.id.teacher_score});<span style="font-family: Arial,Helvetica,sans-serif;">//使用系统的适配器</span>TeacherBaseAdapter adapter = new TeacherBaseAdapter(this,R.layout.itm_teacher_for_score);teachet_listview.setAdapter(adapter);//绑定适配器}}/** * 点击确认按钮的时候发生的事件处理 * @param v */@SuppressLint("ShowToast")public void sure_score_teacher(View v){Intent intentFromTeacher = getIntent();String teacherName = intentFromTeacher.getStringExtra("teacherName");String class_name = null;sqliteDatabase db = helper.getReadableDatabase();Cursor cursor = db.rawQuery("select T_Class_name from allteachermessage where Tno=?",new String[]{ teacherName });if (cursor.moveToFirst()){class_name = cursor.getString(cursor.getColumnIndex("T_Class_name"));}cursor.close();
<span style="white-space:pre"> </span>//遍历listview,把其中排在item第一二三个位置的textview,edittext的值获得,从而插入数据库中for (int i = 0; i < teachet_listview.getChildCount(); i++){LinearLayout layout = (LinearLayout) teachet_listview.getChildAt(i);// 获得子item的layout// EditText et = (EditText) layout.findViewById(R.id.et);//// 从layout中获得控件,根据其id// TextView textView01 = (TextView) layout.getChildAt(0);TextView textView02 = (TextView) layout.getChildAt(1);EditText et = (EditText) layout.getChildAt(2);// String name = textView01.getText().toString();String S_no = textView02.getText().toString();String score = et.getText().toString();Log.i("TeacherMainFrame",S_no + score);db.execsql("UPDATE dbS_C SET score=? WHERE s_name=? AND c_name=?",new Object[]{ score,S_no,class_name });//更新数据库,因为学生之前选课的时候是插入数据库,这里把对应的学生的数据插入到学生--课程表中Toast.makeText(getApplicationContext(),"录入成功",0).show();sure_score.setVisibility(View.GONE);teachet_listview.setVisibility(View.GONE);showStudentPartMessage.setVisibility(View.GONE);}}protected void onActivityResult(int requestCode,int resultCode,Intent data){if (1 == requestCode)if (2 == resultCode){String teacherName = data.getStringExtra("teacherName");intent.putExtra("teacherName",teacherName);}}private AlertDialog builder = null;public boolean onKeyUp(int keyCode,KeyEvent event){if (keyCode == KeyEvent.KEYCODE_BACK){builder = new AlertDialog.Builder(TeacherMainFrame.this).setTitle("温馨提示:").setMessage("退出本程序?").setPositiveButton("确定",new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialog,int whichButton){TeacherMainFrame.this.finish();}}).setNegativeButton("取消",int whichButton){builder.dismiss();}}).show();}return true;}}
教师的布局文件代码:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:orientation="vertical"> <span style="white-space:pre"> </span><!--更改密码 --> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="200dp" android:layout_height="wrap_content" android:text="@string/change_password" android:textColor="#000000" android:textSize="18sp" /> <Button android:id="@+id/change_password_teacher" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="check_message_teacher" android:text="@string/check_self_message" /> </LinearLayout><pre name="code" class="java"><span style="white-space:pre"> </span><!--更改个人信息 --><LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="200dp" android:layout_height="wrap_content" android:text="@string/check_self_message_01" android:textColor="#000000" android:textSize="18sp" /> <Button android:id="@+id/chekSelfMessage_teacher" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="check_message_teacher" android:text="@string/check_self_message" /> </LinearLayout>
<span style="white-space:pre"> </span><!--录入成绩 --><LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" >
<span style="white-space:pre"> </span><!--显示所有的学生部分信息 --><TextView android:layout_width="200dp" android:layout_height="wrap_content" android:text="@string/change_green_teacher_01" android:textColor="#000000" android:textSize="18sp" />
<span style="white-space:pre"> </span><!--去而录入 --><Button android:id="@+id/change_green_teacher" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="check_message_teacher" android:text="@string/check_self_message" /> </LinearLayout> <LinearLayout android:id="@+id/showStudentPartMessage" android:layout_gravity="left" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:visibility="gone" > <TextView android:text="名字" android:layout_width="80dp" android:layout_height="wrap_content" android:layout_marginLeft="30dp"/> <TextView android:text="学号" android:layout_width="80dp" android:layout_height="wrap_content" android:layout_marginLeft="30dp"/> <TextView android:text="成绩" android:layout_width="80dp" android:layout_height="wrap_content"/></LinearLayout> <ListView android:id="@+id/teachet_listview" android:focusable="true" android:layout_width="wrap_content" android:layout_height="wrap_content" > </ListView> <Button android:id="@+id/sure_score" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="sure_score_teacher" android:text="确定" android:visibility="gone" /></LinearLayout> 自定义的适配器
public class TeacherBaseAdapter extends BaseAdapter { List<Map<String,Object>> items;//绑定放入数据 private int resouce;//绑定的数据 private LayoutInflater inflater;//布局填充器 public TeacherBaseAdapter (Context context,List<Map<String,Object>> items,int resouce) { super(); this.items = items; this.resouce = resouce; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } /** * 得到数据的总数 */ public int getCount() { return items.size(); } /** * */ public Object getItem(int position) { return items.get(position); } public long getItemId(int position) { return position; } @SuppressLint("InflateParams") public View getView(int position,View convertView,ViewGroup parent) { if(convertView == null) { convertView = inflater.inflate(resouce,null); } TextView name = (TextView) convertView.findViewById(R.id.teacher_Sname); TextView S_no = (TextView) convertView.findViewById(R.id.teacher_Sno); final EditText score = (EditText) convertView.findViewById(R.id.teacher_score); Map<String,Object> item = items.get(position); name.setText((CharSequence) item.get("name")); S_no.setText((CharSequence) item.get("S_no")); score.setText((CharSequence) item.get("score")); return convertView; } }关于老师更改个人信息,需要我们注意的是老师身为一个用户他需要有哪一些信息,我这里定义的有教师号,名字,年龄,性别(使用RadioGroup),所在学院,所教科目,所教班级,然后所教科目使用一个单选的对话框实现,从数据库查询有哪些课程。其他的雨学生用户的操作类似。还有最后一次是关于管理员用户的。下一篇再与大家分享。 原文链接:https://www.f2er.com/sqlite/199874.html