Data insert in Realtimedatabase in Firebase

 Xml Code :-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="20dp"

    tools:context=".Attendance">
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <LinearLayout

            android:gravity="center"
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <CalendarView

                android:layout_width="match_parent"
                android:layout_height="wrap_content"/>
            <LinearLayout
                android:layout_marginTop="20dp"
                android:padding="10dp"

                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">
                <RelativeLayout
                    android:layout_marginTop="10dp"

                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#05D6F1"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Present:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                    <EditText
                        android:id="@+id/presentattendance"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:hint="0"
                        android:textSize="30sp"
                        android:textStyle="bold" />

                </RelativeLayout>
                <RelativeLayout
                    android:layout_marginTop="10dp"

                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#9E6F2C"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Half Day:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                    <EditText
                        android:id="@+id/halfdayattendance"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:hint="0"
                        android:textSize="30sp"
                        android:textStyle="bold" />

                </RelativeLayout>
                <RelativeLayout
                    android:layout_marginTop="10dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#F63E7D"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Absent:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                    <EditText
                        android:id="@+id/absendattendance"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:hint="0"
                        android:textSize="30sp"
                        android:textStyle="bold" />

                </RelativeLayout>
                <RelativeLayout
                    android:layout_marginTop="10dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#FFD557"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Leave:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                    <EditText
                        android:id="@+id/leaveattendance"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:text="0"
                        android:textSize="30sp"
                        android:textStyle="bold" />

                </RelativeLayout>
                <RelativeLayout
                    android:layout_marginTop="10dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#03A9F4"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Holiday:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                    <EditText
                        android:id="@+id/holidayattendance"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:layout_alignParentRight="true"
                        android:hint="0"
                        android:textSize="30sp"
                        android:textStyle="bold" />

                </RelativeLayout>
                <RelativeLayout
                    android:layout_marginTop="10dp"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content">
                    <TextView
                        android:textColor="#03A9F4"
                        android:layout_marginLeft="20dp"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Total:-"
                        android:textSize="30sp"
                        android:textStyle="bold"/>
                    <EditText
                        android:id="@+id/totalttendace"
                        android:layout_alignParentRight="true"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:hint="0"
                        android:textSize="30sp"
                        android:textStyle="bold"/>

                </RelativeLayout>
                <Button
                    android:onClick="Insert"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Insert"
                    android:id="@+id/insertattendance"/>
            </LinearLayout>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

Model :-  

package com.niranjan.schooladmin.Model;

public class Attandancemodel {
    String present,halfday,absent,leave,holiday,totalattendance;

    public Attandancemodel() {
    }

    public Attandancemodel(String present, String halfday, String absent, String leave, String holiday, String totalattendance) {
        this.present = present;
        this.halfday = halfday;
        this.absent = absent;
        this.leave = leave;
        this.holiday = holiday;
        this.totalattendance = totalattendance;
    }

    public String getPresent() {
        return present;
    }

    public void setPresent(String present) {
        this.present = present;
    }

    public String getHalfday() {
        return halfday;
    }

    public void setHalfday(String halfday) {
        this.halfday = halfday;
    }

    public String getAbsent() {
        return absent;
    }

    public void setAbsent(String absent) {
        this.absent = absent;
    }

    public String getLeave() {
        return leave;
    }

    public void setLeave(String leave) {
        this.leave = leave;
    }

    public String getHoliday() {
        return holiday;
    }

    public void setHoliday(String holiday) {
        this.holiday = holiday;
    }

    public String getTotalattendance() {
        return totalattendance;
    }

    public void setTotalattendance(String totalattendance) {
        this.totalattendance = totalattendance;
    }
}






Java Code :- 





package com.niranjan.schooladmin;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.firestore.DocumentReference;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;
import com.google.firebase.storage.FirebaseStorage;
import com.niranjan.schooladmin.Model.Attandancemodel;

import java.util.HashMap;
import java.util.Map;

public class Attendance extends AppCompatActivity {
EditText present,halfday,absent,leave,holiday,totalattendance;

Button insert;
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference databaseReference;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_attendance);
database=FirebaseDatabase.getInstance();
databaseReference = database.getReference();


        present = findViewById(R.id.presentattendance);
        halfday = findViewById(R.id.halfdayattendance);
        absent = findViewById(R.id.absendattendance);
        leave = findViewById(R.id.leaveattendance);
        holiday = findViewById(R.id.holidayattendance);
        totalattendance = findViewById(R.id.totalttendace);
        insert=findViewById(R.id.insertattendance);
insert.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Attandancemodel attandancemodel= new Attandancemodel(present.getText().toString(),(halfday.getText().toString()),(absent.getText().toString())
                ,(leave.getText().toString()),(holiday.getText().toString()),(totalattendance.getText().toString()));
        databaseReference.child("Attandance").setValue(attandancemodel);
    }
});


    }



}