unable to go from one activity to another - android-studio

Question

Whenever I try to go from any activity to this particular activity,
the application goes back to the login screen.
Activity (I could not reach) Java source file:
package com.example.studentresultmaangementsystem;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TableLayout;
import android.widget.TableRow;
importandroid.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
public class Main7Activity extends AppCompatActivity {
Button button,button1;
TableLayout layout1;
TableLayout layout2;
TableRow table1row1;
TableRow table1row2;
TableRow table1row3;
TableRow table2row1;
TableRow table2row2;
TableRow table2row3;
TableRow table2row4;
TableRow table2row5;
TableRow table2row7;
TableRow table2row6;
EditText name;
EditText rollNumber;
EditText subject1;
EditText subject2;
EditText subject3;
EditText subject4;
EditText subject5;
EditText subject6;
EditText marks1,marks2,marks3,marks4,marks5,marks6;
DatabaseReference drf;
Student stu;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.adding);
layout1 = (TableLayout) findViewById(R.id.tb);
layout2 = (TableLayout)findViewById(R.id.tb2);
table1row1 = (TableRow)findViewById(R.id.r1);
table1row2 = (TableRow)findViewById(R.id.r3);
table1row3 = (TableRow)findViewById(R.id.row);
table2row1 = (TableRow)findViewById(R.id.row1);
table2row2 = (TableRow)findViewById(R.id.row2);
table2row3 = (TableRow)findViewById(R.id.row3);
table2row4 = (TableRow)findViewById(R.id.row4);
table2row5 = (TableRow)findViewById(R.id.row5);
table2row6 = (TableRow)findViewById(R.id.row6);
table2row7 = (TableRow)findViewById(R.id.row7);
button = (Button) findViewById(R.id.bu);
button1 = (Button) findViewById(R.id.bu1);
name = (EditText) findViewById(R.id.en);
rollNumber = (EditText) findViewById(R.id.er);
subject1 = (EditText) findViewById(R.id.es1);
subject2 = (EditText) findViewById(R.id.es2);
subject3 = (EditText) findViewById(R.id.es3);
subject4 = (EditText) findViewById(R.id.es4);
subject5 = (EditText) findViewById(R.id.es5);
subject6 = (EditText) findViewById(R.id.es6);
marks1 = (EditText) findViewById(R.id.em1);
marks2 = (EditText) findViewById(R.id.em2);
marks3 = (EditText) findViewById(R.id.em3);
marks4 = (EditText) findViewById(R.id.em4);
marks5 = (EditText) findViewById(R.id.em5);
marks6 = (EditText) findViewById(R.id.em6);
stu = new Student();
drf = FirebaseDatabase.getInstance().getReference().child("student");
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String n = name.getText().toString();
int rollnumber = Integer.parseInt(rollNumber.getText().toString().trim());
String s1 = subject1.getText().toString();
String s2 = subject2.getText().toString();
String s3 = subject3.getText().toString();
String s4 = subject4.getText().toString();
String s5 = subject5.getText().toString();
String s6 = subject6.getText().toString();
float m1 = Float.parseFloat(marks1.getText().toString().trim());
float m2 = Float.parseFloat(marks2.getText().toString().trim());
float m3 = Float.parseFloat(marks3.getText().toString().trim());
float m4 = Float.parseFloat(marks4.getText().toString().trim());
float m5 = Float.parseFloat(marks5.getText().toString().trim());
float m6 = Float.parseFloat(marks6.getText().toString().trim());
stu.setSubject1(s1);
stu.setSubject2(s2);
stu.setSubject3(s3);
stu.setSubject4(s4);
stu.setSubject5(s5);
stu.setSubject6(s6);
stu.setMarks1(m1);
stu.setMarks2(m2);
stu.setMarks3(m3);
stu.setMarks4(m4);
stu.setMarks5(m5);
stu.setMarks6(m6);
drf.push().setValue(stu);
Toast.makeText(Main7Activity.this, "the data has been inserted into the database", Toast.LENGTH_SHORT).show();
}
});
}
}
XML layout file tied to the above Java file
<?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"
tools:context=".Main7Activity"
android:background="#E0314C">
<TableLayout
android:id="#+id/tb" android:layout_width="367dp"
android:layout_height="wrap_content"
android:layout_marginHorizontal="10dp"
android:layout_marginVertical="40dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:background="#f1f1f1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="MissingConstraints">
<TableRow android:id="#+id/r1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#74B7D5"
android:gravity="center"
android:text="ENTER DETAILS OF STUDENT " android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/r3">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#74B7D5"
android:gravity="center"
android:text="Name ="
android:textStyle="bold" />
<EditText android:id="#+id/en"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="5"
android:background="#ffffff"
android:gravity="center"
android:hint="enter name"
android:inputType="text"
android:maxLength="10"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#74B7D5"
android:gravity="center"
android:text="RollNo ="
android:textStyle="bold" />
<EditText
android:id="#+id/er"
android:layout_width="204dp"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="5"
android:background="#ffffff"
android:gravity="center"
android:hint="enter rollno"
android:inputType="number"
android:maxLength="6"
android:textStyle="bold" />
</TableRow>
</TableLayout>
<TableLayout
android:id="#+id/tb2"
android:layout_width="382dp"
android:layout_height="wrap_content"
android:layout_marginHorizontal="20dp"
android:layout_marginVertical="1dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
android:background="#f1f1f1"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/tb"
tools:ignore="MissingConstraints">
<TableRow android:id="#+id/row1">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#74B7D5"
android:gravity="center"
android:text="Subjects "
android:textStyle="bold" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#74B7D5"
android:gravity="center"
android:text="Marks "
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row2">
<EditText
android:id="#+id/es1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1" ----------
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number"
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row3">
<EditText
android:id="#+id/es2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number"
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row4">
<EditText
android:id="#+id/es3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em3"
android:layout_width="114dp"
android:layout_height="match_parent"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number"
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row5">
<EditText
android:id="#+id/es4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number"
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row6">
<EditText
android:id="#+id/es5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
<TableRow android:id="#+id/row7">
<EditText
android:id="#+id/es6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="subject_name"
android:inputType="text"
android:maxLength="8"
android:textStyle="bold" />
<EditText
android:id="#+id/em6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="1dp"
android:layout_weight="1"
android:background="#ffffff"
android:gravity="center"
android:hint="enter marks"
android:inputType="number"
android:maxLength="3"
android:textStyle="bold" />
</TableRow>
</TableLayout>
<Button
android:id="#+id/bu"
android:layout_width="106dp"
android:layout_height="39dp"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:onClick="addata"
android:text="Add data"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.947"
app:layout_constraintStart_toStartOf="parent"
tools:ignore="MissingConstraints"
tools:layout_editor_absoluteY="631dp"
/>
<Button
android:id="#+id/bu1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentLeft="true"
android:layout_alignParentEnd="true"
android:layout_alignParentRight="true"
android:layout_alignParentBottom="true"
android:onClick="back"
android:text="Go back"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.25"
app:layout_constraintStart_toStartOf="parent"
tools:ignore="MissingConstraints,OnClick"
tools:layout_editor_absoluteY="631dp" />
</LinearLayout>