java.lang.ClassCastException：无法投射 android.app.Application 使我的应用程序崩溃答案

【问题标题】：java.lang.ClassCastException: android.app.Application cannot be cast make my apps crashjava.lang.ClassCastException：无法投射 android.app.Application 使我的应用程序崩溃
【发布时间】：2021-05-25 12:47:58
【问题描述】：

我在其他页面中有很多此错误，但此错误拒绝显示下一页。这是我的错误。此错误“无法投射”实际上出现在多个页面上。这是来自我的编码或数据库的错误吗？提前致谢

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.prototype, PID: 5537
    java.lang.ClassCastException: android.app.Application cannot be cast to com.example.TaskaKemasNurSurya.ApplicationContext
        at com.example.TaskaKemasNurSurya.ModifyAttandance$3.onClick(ModifyAttandance.java:58)
        at android.view.View.performClick(View.java:5610)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
        at android.view.View$PerformClick.run(View.java:22265)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6077)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

这是我的代码


            @Override
            public void onClick(View arg0) {

                DBAdapter dbAdapter = new DBAdapter(ModifyAttandance.this);
                ArrayList<AttendanceBean> attendanceBeanList=dbAdapter.getAllAttendanceByStudent();
                ((ApplicationContext)ModifyAttandance.this.getApplicationContext()).setAttendanceBeanList(attendanceBeanList);
                Intent intent = new Intent(ModifyAttandance.this,ViewAttendancePerStudentActivity.class);
                startActivity(intent);

            }
        });

这个来自数据库


import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

import androidx.annotation.Nullable;

import java.util.ArrayList;

public class DBAdapter extends SQLiteOpenHelper {

    // All Static variables
    // Database Version
    private static final int DATABASE_VERSION = 1;

    // Database Name
    private static final String DATABASE_NAME = "Attendance";

    // Contacts table name
    private static final String STUDENT_INFO_TABLE = "student_table";
    private static final String ATTENDANCE_SESSION_TABLE = "attendance_session_table";
    private static final String ATTENDANCE_TABLE = "attendance_table";

    // Contacts Table Columns names
    private static final String KEY_STUDENT_MYKID = "student_mykid";
    private static final String KEY_STUDENT_NAME = "student_name";
    private static final String KEY_STUDENT_MO_NO = "student_mobilenumber";
    private static final String KEY_STUDENT_ADDRESS = "student_address";
    private static final String KEY_STUDENT_YEAR = "student_year";

    private static final String KEY_ATTENDANCE_SESSION_ID = "attendance_session_id";
    private static final String KEY_ATTENDANCE_SESSION_DATE = "attendance_session_date";
    private static final String KEY_ATTENDANCE_SESSION_YEAR = "attendance_session_year";

    private static final String KEY_SESSION_ID = "attendance_session_id";
    private static final String KEY_ATTENDANCE_STUDENT_MYKID = "attendance_student_mykid";
    private static final String KEY_ATTENDANCE_STATUS = "attendance_status";


    public DBAdapter(@Nullable Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String queryStudent="CREATE TABLE "+ STUDENT_INFO_TABLE +" (" +
                KEY_STUDENT_MYKID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_STUDENT_NAME + " TEXT, " +
                KEY_STUDENT_MO_NO + " TEXT, " +
                KEY_STUDENT_ADDRESS + " TEXT," +
                KEY_STUDENT_YEAR + " INTEGER " + ")";
        Log.d("queryStudent",queryStudent );

        String queryAttendanceSession="CREATE TABLE "+ ATTENDANCE_SESSION_TABLE +" (" +
                KEY_ATTENDANCE_SESSION_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_ATTENDANCE_SESSION_DATE + " DATE," +
                KEY_ATTENDANCE_SESSION_YEAR + " INTEGER" + ")";
        Log.d("queryAttendanceSession",queryAttendanceSession );

        String queryAttendance="CREATE TABLE "+ ATTENDANCE_TABLE +" (" +
                KEY_SESSION_ID + " INTEGER, " +
                KEY_ATTENDANCE_STUDENT_MYKID + " INTEGER, " +
                KEY_ATTENDANCE_STATUS + " TEXT " + ")";
        Log.d("queryAttendance",queryAttendance );

        try
        {
            db.execSQL(queryStudent);
            db.execSQL(queryAttendanceSession);
            db.execSQL(queryAttendance);
        }
        catch (Exception e) {
            e.printStackTrace();
            Log.e("Exception", e.getMessage());
        }

    }


    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {

        String queryStudent="CREATE TABLE "+ STUDENT_INFO_TABLE +" (" +
                KEY_STUDENT_MYKID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_STUDENT_NAME + " TEXT, " +
                KEY_STUDENT_MO_NO + " TEXT, " +
                KEY_STUDENT_ADDRESS + " TEXT," +
                KEY_STUDENT_YEAR + " TEXT " + ")";
        Log.d("queryStudent",queryStudent );

        String queryAttendanceSession="CREATE TABLE "+ ATTENDANCE_SESSION_TABLE +" (" +
                KEY_ATTENDANCE_SESSION_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                KEY_ATTENDANCE_SESSION_DATE + " TEXT," +
                KEY_ATTENDANCE_SESSION_YEAR + " INTEGER" +")";
        Log.d("queryAttendanceSession",queryAttendanceSession );

        String queryAttendance="CREATE TABLE "+ ATTENDANCE_TABLE +" (" +
                KEY_SESSION_ID + " INTEGER, " +
                KEY_ATTENDANCE_STUDENT_MYKID + " INTEGER, " +
                KEY_ATTENDANCE_STATUS + " TEXT " + ")";
        Log.d("queryAttendance",queryAttendance );

        try
        {
            db.execSQL(queryStudent);
            db.execSQL(queryAttendanceSession);
            db.execSQL(queryAttendance);
        }
        catch (Exception e) {
            e.printStackTrace();
            Log.e("Exception", e.getMessage());
        }
    }

    public void addStudent(StudentBean studentBean) {
        SQLiteDatabase db = this.getWritableDatabase();

        String query = "INSERT INTO student_table (student_name,student_mobilenumber,student_address,student_year) values ('"+
                studentBean.getStudent_name()+"', '"+
                studentBean.getStudent_mobilenumber()+"', '"+
                studentBean.getStudent_address()+"', '"+
                studentBean.getStudent_year()+"')";
        Log.d("query", query);
        db.execSQL(query);
        db.close();
    }
    public ArrayList<StudentBean> getAllStudent()
    {
        ArrayList<StudentBean> list = new ArrayList<StudentBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM student_table";
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{
                StudentBean studentBean = new StudentBean();
                studentBean.setStudent_mykid(Integer.parseInt(cursor.getString(0)));
                studentBean.setStudent_name(cursor.getString(1));
                studentBean.setStudent_mobilenumber(cursor.getString(2));
                studentBean.setStudent_address(cursor.getString(3));
                studentBean.setStudent_year(cursor.getString(4));
                list.add(studentBean);
            }while(cursor.moveToNext());
        }
        return list;
    }
    public ArrayList<StudentBean> getAllStudentByBranchYear(String branch,String year)
    {
        ArrayList<StudentBean> list = new ArrayList<StudentBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM student_table where student_year='"+year+"'";
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{
                StudentBean studentBean = new StudentBean();
                studentBean.setStudent_mykid(Integer.parseInt(cursor.getString(0)));
                studentBean.setStudent_name(cursor.getString(1));
                studentBean.setStudent_mobilenumber(cursor.getString(2));
                studentBean.setStudent_address(cursor.getString(3));
                studentBean.setStudent_year(cursor.getString(4));
                list.add(studentBean);
            }while(cursor.moveToNext());
        }
        return list;
    }
    public StudentBean getStudentByMykid(int studentMykid)
    {
        StudentBean studentBean = new StudentBean();
        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM student_table where student_id="+studentMykid;
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{

                studentBean.setStudent_mykid(Integer.parseInt(cursor.getString(0)));
                studentBean.setStudent_name(cursor.getString(1));
                studentBean.setStudent_mobilenumber(cursor.getString(2));
                studentBean.setStudent_address(cursor.getString(3));
                studentBean.setStudent_year(cursor.getString(4));

            }while(cursor.moveToNext());
        }
        return studentBean;
    }
    public void deleteStudent(int studentMykid) {
        SQLiteDatabase db = this.getWritableDatabase();

        String query = "DELETE FROM student_table WHERE student_id="+studentMykid ;

        Log.d("query", query);
        db.execSQL(query);
        db.close();
    }

    //attendance session Table crud
    public int addAttendanceSession(AttendanceSessionBean attendanceSessionBean) {
        SQLiteDatabase db = this.getWritableDatabase();

        String query = "INSERT INTO attendance_session_table (attendance_session_year,attendance_session_date) values ('"+
                attendanceSessionBean.getAttendance_session_date()+"', '"+
                attendanceSessionBean.getAttendance_session_year()+"')";
        Log.d("query", query);
        db.execSQL(query);

        String query1= "select max(attendance_session_id) from attendance_session_table";
        Cursor cursor = db.rawQuery(query1, null);

        if(cursor.moveToFirst())
        {
            int sessionId = Integer.parseInt(cursor.getString(0));

            return sessionId;
        }


        db.close();
        return 0;
    }

    public ArrayList<AttendanceSessionBean> getAllAttendanceSession()
    {
        ArrayList<AttendanceSessionBean> list = new ArrayList<AttendanceSessionBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM attendance_session_table";
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{
                AttendanceSessionBean attendanceSessionBean = new AttendanceSessionBean();
                attendanceSessionBean.setAttendance_session_id(Integer.parseInt(cursor.getString(0)));
                attendanceSessionBean.setAttendance_session_date(cursor.getString(1));
                attendanceSessionBean.setAttendance_session_year(cursor.getString(2));
                list.add(attendanceSessionBean);
            }while(cursor.moveToNext());
        }
        return list;
    }

    public void deleteAttendanceSession(int attendanceSessionId) {
        SQLiteDatabase db = this.getWritableDatabase();

        String query = "DELETE FROM attendance_session_table WHERE attendance_session_id="+attendanceSessionId ;

        Log.d("query", query);
        db.execSQL(query);
        db.close();
    }
    //attendance crud
    public void addNewAttendance(AttendanceBean attendanceBean) {
        SQLiteDatabase db = this.getWritableDatabase();

        String query = "INSERT INTO attendance_table values ("+
                attendanceBean.getAttendance_session_id()+", "+
                attendanceBean.getAttendance_student_mykid()+", '"+
                attendanceBean.getAttendance_status()+"')";
        Log.d("query", query);
        db.execSQL(query);
        db.close();
    }

    public ArrayList<AttendanceBean> getAttendanceBySessionID(AttendanceSessionBean attendanceSessionBean)
    {
        int attendanceSessionId=0;
        ArrayList<AttendanceBean> list = new ArrayList<AttendanceBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM attendance_session_table where attendance_session_year='"+attendanceSessionBean.getAttendance_session_year()+"'" +
                " AND attendance_session_date='"+attendanceSessionBean.getAttendance_session_date();
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{
                attendanceSessionId=(Integer.parseInt(cursor.getString(0)));
            }while(cursor.moveToNext());
        }

        String query1="SELECT * FROM attendance_table where attendance_session_id=" + attendanceSessionId+" order by attendance_student_id";
        Cursor cursor1 = db.rawQuery(query1, null);
        if(cursor1.moveToFirst())
        {
            do{
                AttendanceBean attendanceBean = new AttendanceBean();
                attendanceBean.setAttendance_session_id(Integer.parseInt(cursor1.getString(0)));
                attendanceBean.setAttendance_student_mykid(Integer.parseInt(cursor1.getString(1)));
                attendanceBean.setAttendance_status(cursor1.getString(2));
                list.add(attendanceBean);

            }while(cursor1.moveToNext());
        }
        return list;
    }

    public ArrayList<AttendanceBean> getTotalAttendanceBySessionID(AttendanceSessionBean attendanceSessionBean)
    {
        int attendanceSessionId=0;
        ArrayList<AttendanceBean> list = new ArrayList<AttendanceBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM attendance_session_table where attendance_session_year='"+"'";
        Cursor cursor = db.rawQuery(query, null);

        if(cursor.moveToFirst())
        {
            do{
                attendanceSessionId=(Integer.parseInt(cursor.getString(0)));

                String query1="SELECT * FROM attendance_table where attendance_session_id=" + attendanceSessionId+" order by attendance_student_id";
                Cursor cursor1 = db.rawQuery(query1, null);
                if(cursor1.moveToFirst())
                {
                    do{
                        AttendanceBean attendanceBean = new AttendanceBean();
                        attendanceBean.setAttendance_session_id(Integer.parseInt(cursor1.getString(0)));
                        attendanceBean.setAttendance_student_mykid(Integer.parseInt(cursor1.getString(1)));
                        attendanceBean.setAttendance_status(cursor1.getString(2));
                        list.add(attendanceBean);

                    }while(cursor1.moveToNext());
                }

                AttendanceBean attendanceBean = new AttendanceBean();
                attendanceBean.setAttendance_session_id(0);
                attendanceBean.setAttendance_status("Date : " + cursor.getString(4));
                list.add(attendanceBean);

            }while(cursor.moveToNext());
        }


        return list;
    }

    public ArrayList<AttendanceBean> getAllAttendanceByStudent()
    {
        ArrayList<AttendanceBean> list = new ArrayList<AttendanceBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT attendance_student_mykid,count(*) FROM attendance_table where attendance_status='P' group by attendance_student_mykid";

        Log.d("query", query);

        Cursor cursor = db.rawQuery(query, null);



        if(cursor.moveToFirst())
        {
            do{
                Log.d("studentId","studentId:"+cursor.getString(0)+", Count:"+cursor.getString(1));
                AttendanceBean attendanceBean = new AttendanceBean();
                attendanceBean.setAttendance_student_mykid(Integer.parseInt(cursor.getString(0)));
                attendanceBean.setAttendance_session_id(Integer.parseInt(cursor.getString(1)));
                list.add(attendanceBean);

            }while(cursor.moveToNext());
        }
        return list;
    }

    /*public ArrayList<AttendanceBean> getAllAttendanceBySessionID(int sessionId)
    {
        ArrayList<AttendanceBean> list = new ArrayList<AttendanceBean>();

        SQLiteDatabase db = this.getWritableDatabase();
        String query = "SELECT * FROM attendance_table where attendance_session_id=" + sessionId;
        Cursor cursor = db.rawQuery(query, null);

        if(!cursor.moveToFirst())
        {
            do{
                AttendanceBean attendanceBean = new AttendanceBean();
                attendanceBean.setAttendance_session_id(Integer.parseInt(cursor.getString(0)));
                attendanceBean.setAttendance_student_id(Integer.parseInt(cursor.getString(1)));
                attendanceBean.setAttendance_status(cursor.getString(2));
                list.add(attendanceBean);

            }while(cursor.moveToNext());
        }
        return list;
    }*/




    // Creating Tables
    /*@Override
    public void onCreate(SQLiteDatabase db) {
        String CREATE_User_Info_TABLE = "CREATE TABLE " + TABLE_INFO_USER + "("
                + KEY_ID + " INTEGER PRIMARY KEY, " + KEY_NAME + " TEXT, "+ " +KEY_MO_NO +" TEXT, "
                +KEY_EMAIL +" TEXT, " +KEY_USERNAME +" TEXT, " + KEY_PASSWORD +" TEXT " + ")";

        Log.d("rupali",CREATE_User_Info_TABLE );
        db.execSQL(CREATE_User_Info_TABLE);
    }

    // Upgrading database
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // Drop older table if existed
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_INFO_USER);

        // Create tables again
        onCreate(db);
    }

     *//**
     * All CRUD(Create, Read, Update, Delete) Operations
     *//*



    void addUserInfo(UserInfo userinfo) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_FIRSTNAME, userinfo.getUser_Firstname()); //  Name
        values.put(KEY_LASTNAME, userinfo.getUser_Lastname()); //  Name
        values.put(KEY_MO_NO, userinfo.getUser_MobileNo()); // Contact Phone
        values.put(KEY_EMAIL, userinfo.getUser_EmailId());
        values.put(KEY_USERNAME, userinfo.getUser_Username());
        values.put(KEY_PASSWORD, userinfo.getUser_Password());

        // Inserting Row
        db.insert(TABLE_INFO_USER, null, values);
        //2nd argument is String containing nullColumnHack
        db.close(); // Closing database connection
    }


    // Getting single contact
    UserInfo getUserInfo(int id) {
        SQLiteDatabase db = this.getReadableDatabase();

        Cursor cursor = db.query(TABLE_INFO_USER, new String[] { KEY_ID,
                KEY_FIRSTNAME, KEY_LASTNAME,KEY_MO_NO,  KEY_EMAIL, KEY_USERNAME, KEY_PASSWORD }, KEY_ID + "=?",
                new String[] { String.valueOf(id) }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        UserInfo userinfo = new UserInfo(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4),cursor.getString(5),cursor.getString(6));
        // return contact
                return userinfo;
    }

    public UserInfo validateUser(String username, String password)
    {
        SQLiteDatabase db = this.getReadableDatabase();
        String query = "Select * from User_Info_Table WHERE User_Username='"+ username +"' AND User_Password='"+password+"'";
        Log.d("Rupali", "Login QUERY:" + query);

        Cursor cursor = db.rawQuery(query, null);


        if(!cursor.moveToFirst())
        {
            Log.d("Rupali", "cursor is null.. returing NULL");
            return null;
        }
        Log.d("Rupali", "cursor is NOT null.. we got user data...");


        UserInfo userinfo = new UserInfo(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4),cursor.getString(5),cursor.getString(6));

        return userinfo;
    }

    // Updating single contact
    public int updateUserPassword(UserInfo userinfo) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_PASSWORD, userinfo.getUser_Password());


        // updating row
        return db.update(TABLE_INFO_USER, values, KEY_ID + " = ?",
                new String[] { String.valueOf(userinfo.getUser_id()) });
    }

    public int updateUserContact(UserInfo userinfo) {
        SQLiteDatabase db = this.getWritableDatabase();

        ContentValues values = new ContentValues();
        values.put(KEY_MO_NO, userinfo.getUser_MobileNo());
        values.put(KEY_EMAIL, userinfo.getUser_EmailId());


        // updating row
        return db.update(TABLE_INFO_USER, values, KEY_ID + " = ?",
                new String[] { String.valueOf(userinfo.getUser_id()) });
    }


    //veiw details

    public UserInfo viewUserInfo(String id) {
        SQLiteDatabase db = this.getReadableDatabase();

        String query = "Select * from User_Info_Table WHERE id='"+id+"'";
        Cursor cursor = db.rawQuery(query, null);
        if(!cursor.moveToFirst())
        {
            Log.d("Rupali", "cursor is null.. returing NULL");
            return null;
        }
        Log.d("Rupali", "cursor is NOT null.. we got user data...");

        UserInfo userinfo = new UserInfo(Integer.parseInt(cursor.getString(0)),
                cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4),cursor.getString(5),cursor.getString(6));
        // return contact
        return userinfo;
    }



     // Getting All users
    public List<UserInfo> getAllUserInfo() {
        List<UserInfo> userinfolist = new ArrayList<UserInfo>();
        // Select All Query
        String selectQuery = "SELECT  * FROM " + TABLE_INFO_USER;

        SQLiteDatabase db = this.getWritableDatabase();
        Cursor cursor = db.rawQuery(selectQuery, null);

        // looping through all rows and adding to list
        if (cursor.moveToFirst()) {
            do {

                UserInfo userinfo=new UserInfo();

                userinfo.setUser_id(Integer.parseInt(cursor.getString(0)));
                userinfo.setUser_Lastname(cursor.getString(2));
                userinfo.setUser_Username(cursor.getString(5));
                userinfo.setUser_Firstname(cursor.getString(1));



                // Adding contact to list
                userinfolist.add(userinfo);
            } while (cursor.moveToNext());
        }

        // return contact list
        return userinfolist;
    }

    // Deleting single contact
    public void deleteUser(UserInfo userinfo) {
        SQLiteDatabase db = this.getWritableDatabase();
        db.delete(TABLE_INFO_USER, KEY_ID + " = ?",
                new String[] { String.valueOf(userinfo.getUser_id()) });
        db.close();
    }
      */
}

这个来自出席豆


public class AttendanceBean {

    private int attendance_session_id;
    private int attendance_student_mykid;
    private String attendance_status;

    public int getAttendance_session_id() {
        return attendance_session_id;
    }
    public void setAttendance_session_id(int attendance_session_id) {
        this.attendance_session_id = attendance_session_id;
    }
    public int getAttendance_student_mykid() {
        return attendance_student_mykid;
    }
    public void setAttendance_student_mykid(int attendance_student_id) {
        this.attendance_student_mykid = attendance_student_id;
    }
    public String getAttendance_status() {
        return attendance_status;
    }
    public void setAttendance_status(String attendance_status) {
        this.attendance_status = attendance_status;
    }



}

【问题讨论】：

标签： android-studio

【解决方案1】：

我假设您的 onClick() 方法在 ModifyAttandance 类中。问题在于你的选角：

((ApplicationContext)ModifyAttandance.this.getApplicationContext()).setAttendanceBeanList(attendanceBeanList);

像这样试一试。

@Override
    public void onClick(View arg0) {

    DBAdapter dbAdapter = new DBAdapter(this);
    ArrayList<AttendanceBean> attendanceBeanList=dbAdapter.getAllAttendanceByStudent();
    setAttendanceBeanList(attendanceBeanList);
    Intent intent = new Intent(ModifyAttandance.this,ViewAttendancePerStudentActivity.class);
    startActivity(intent);
}
});

【讨论】：

我试过但它说“无法解析方法'setAttendanceBeanList(java.util.ArrayList)'”
你在哪里找到你的setAttendanceBeanList 方法？您可以使用此方法编辑您的帖子并添加课程吗？
你可以参考考勤豆