你用代码表示不行吗

抱歉我的回答没有直接给出代码，我可以为你提供一些代码示例，但是由于学生点名系统的具体需求、功能和界面设计可能会有所不同，因此这些示例只能作为参考。

1. 学生信息的存储和管理

public class StudentDatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "students.db";
    private static final int DATABASE_VERSION = 1;

    public StudentDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE students (_id INTEGER PRIMARY KEY AUTOINCREMENT, "
            + "number TEXT, "
            + "name TEXT, "
            + "gender TEXT);");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS students");
        onCreate(db);
    }
}

public class Student {

    private int id;
    private String number;
    private String name;
    private String gender;

    public Student(int id, String number, String name, String gender) {
        this.id = id;
        this.number = number;
        this.name = name;
        this.gender = gender;
    }

    public int getId() {
        return id;
    }

    public String getNumber() {
        return number;
    }

    public String getName() {
        return name;
    }

    public String getGender() {
        return gender;
    }
}

2. 点名记录的存储和管理

public class RollCallDatabaseHelper extends SQLiteOpenHelper {

    private static final String DATABASE_NAME = "rollcall.db";
    private static final int DATABASE_VERSION = 1;

    public RollCallDatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE rollcall (_id INTEGER PRIMARY KEY AUTOINCREMENT, "
            + "class TEXT, "
            + "subject TEXT, "
            + "time TEXT, "
            + "student_id INTEGER);");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS rollcall");
        onCreate(db);
    }
}

public class RollCall {

    private int id;
    private String className;
    private String subject;
    private String time;
    private int studentId;

    public RollCall(int id, String className, String subject, String time, int studentId) {
        this.id = id;
        this.className = className;
        this.subject = subject;
        this.time = time;
        this.studentId = studentId;
    }

    public int getId() {
        return id;
    }

    public String getClassName() {
        return className;
    }

    public String getSubject() {
        return subject;
    }

    public String getTime() {
        return time;
    }

    public int getStudentId() {
        return studentId;
    }
}

3. 点名功能的实现

public class RollCallActivity extends AppCompatActivity {

    private TextView mStudentNameView;
    private Button mRollCallButton;

    private StudentDatabaseHelper mStudentDbHelper;
    private RollCallDatabaseHelper mRollCallDbHelper;
    private SQLiteDatabase mStudentDb;
    private SQLiteDatabase mRollCallDb;
    private Cursor mStudentCursor;

    private int mSelectedStudentId;

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

        mStudentNameView = findViewById(R.id.student_name_view);
        mRollCallButton = findViewById(R.id.roll_call_button);

        mStudentDbHelper = new StudentDatabaseHelper(this);
        mRollCallDbHelper = new RollCallDatabaseHelper(this);

        mStudentDb = mStudentDbHelper.getReadableDatabase();
        mRollCallDb = mRollCallDbHelper.getWritableDatabase();

        mStudentCursor = mStudentDb.rawQuery("SELECT * FROM students", null);
        mStudentCursor.moveToFirst();

        mSelectedStudentId = mStudentCursor.getInt(mStudentCursor.getColumnIndex("_id"));
        mStudentNameView.setText(mStudentCursor.getString(mStudentCursor.getColumnIndex("name")));

        mRollCallButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ContentValues values = new ContentValues();
                values.put("class", "1班");
                values.put("subject", "语文");
                values.put("time", new Date().toString());
                values.put("student_id", mSelectedStudentId);
                mRollCallDb.insert("rollcall", null, values);

                mStudentCursor.moveToNext();
                if (mStudentCursor.isAfterLast()) {
                    mStudentCursor.moveToFirst();
                }
                mSelectedStudentId = mStudentCursor.getInt(mStudentCursor.getColumnIndex("_id"));
                mStudentNameView.setText(mStudentCursor.getString(mStudentCursor.getColumnIndex("name")));
            }
        });
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mStudentDbHelper.close();
        mRollCallDbHelper.close();
        mStudentCursor.close();
    }
}

4. 界面的设计和实现

参考以下的XML布局文件：

activity_roll_call.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/student_name_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="24sp" />

    <Button
        android:id="@+id/roll_call_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="开始点名" />

</LinearLayout>

这些示例代码只是一个简单的演示，你需要根据具体需求进行修改和完善。希望对你有所帮助。