xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
  tools:context=".MainActivity">
  <TextView
    android:id="@+id/tv0"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:text="LOGIN FORM "
    android:textColor="@color/black"
    android:textSize="40dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.497"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.041" />
  <TextView
    android:id="@+id/tv1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="32dp"
    android:layout_marginRight="40dp"
    android:text="USERNAME"
    android:textColor="@color/black"
    android:textSize="30dp"
    app:layout_constraintHorizontal_bias="0.075"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@id/tv0" />
  <TextView
    android:id="@+id/tv2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="50dp"
    android:layout_marginRight="40dp"
    android:text="PASSWORD"
    android:textColor="@color/black"
    android:textSize="30dp"
    app:layout_constraintHorizontal_bias="0.075"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@id/tv1" />
  <EditText
    android:id="@+id/edu"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="24dp"
    android:layout_marginEnd="16dp"
    android:hint="USERNAME"
    android:textSize="20dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintLeft_toRightOf="@id/tv1"
    app:layout_constraintTop_toBottomOf="@id/tv0" />
  <EditText
    android:id="@+id/edp"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="48dp"
    android:layout_marginEnd="16dp"
    android:textSize="20dp"
    android:hint="PASSWORD"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintLeft_toRightOf="@id/tv2"
    app:layout_constraintTop_toBottomOf="@id/edu" />
  <Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/bus"
    app:layout_constraintTop_toBottomOf="@id/edp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:text="LOGIN"
    android:layout_marginTop="50dp"/>
</androidx.constraintlayout.widget.ConstraintLayout>
java:
package com.example.lpogon;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
  EditText e1, e2;
  Button b;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
        e1 = findViewById(R.id.edu);
        e2 = findViewById(R.id.edp);
        b = findViewById(R.id.bus);
        b.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
             if (e1.getText().toString().equals("admin")&&e2.getText().toString().equals("admin123")){
                 Toast.makeText(MainActivity.this, "Login Successfully", Toast.LENGTH_SHORT).show();
             }
             else {
                 Toast.makeText(MainActivity.this, "Login Unsuccessfulladmin", Toast.LENGTH_SHORT).show();
             }
           }
        });
    }
}
output: