p3

 acitivity_main.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/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Password:"
        android:textAllCaps="true"
        android:textColor="#3949AB"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.423" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SIGN UP ACTIVITY"
        android:textAlignment="center"
        android:textColor="#8E24AA"
        android:textSize="34sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.074" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="User Name:"
        android:textAllCaps="true"
        android:textColor="#3949AB"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.102"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.271" />

    <EditText
        android:id="@+id/txt_login_username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.92"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.256" />

    <EditText
        android:id="@+id/txt_login_password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.91"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.412" />

    <Button
        android:id="@+id/btn_login_signup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#1E88E5"
        android:backgroundTint="#1E88E5"
        android:text="Sign Up"
        android:textColorLink="#1E88E5"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.423"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.628" />
</androidx.constraintlayout.widget.ConstraintLayout>

mainactivity.java
package com.example.signup;

import androidx.appcompat.app.AppCompatActivity;

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

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MainActivity extends AppCompatActivity implements
        View.OnClickListener {
    EditText txtUsername;
    EditText txtPassword;
    Button btnSignup;
    String regularExpression = "^(?=.*[A-Z])(?=.*[a-z])(?=.*\\d)(?=.*[@$!])[A-Za-z\\d@$!]{8,}$";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtUsername = (EditText)
                findViewById(R.id.txt_login_username);
        txtPassword = (EditText)
                findViewById(R.id.txt_login_password);
        btnSignup = (Button)
                findViewById(R.id.btn_login_signup);
        btnSignup.setOnClickListener(this);
    }
    public void onClick(View v) {
        String username = txtUsername.getText().toString();
        String password = txtPassword.getText().toString();
        if (validatePassword(password)) {
            Bundle bundle = new Bundle();
            bundle.putString("user", username);
            bundle.putString("pass", password);
            Intent it = new Intent(this, Login.class);
            it.putExtra("data", bundle);
            startActivity(it);
        } else {
            Toast.makeText(getBaseContext(), "Invalid Password",
                    Toast.LENGTH_LONG).show();
        }
    }
    private boolean validatePassword(String password) {
        Pattern pattern = Pattern.compile(regularExpression);
        Matcher matcher = pattern.matcher(password);
        return matcher.matches();
    }
}

activity_login.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/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Password:"
        android:textAllCaps="true"
        android:textColor="#3949AB"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.1"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.423" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="LOGIN ACTIVITY"
        android:textAlignment="center"
        android:textColor="#8E24AA"
        android:textSize="34sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.074" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="User Name:"
        android:textAllCaps="true"
        android:textColor="#3949AB"
        android:textSize="24sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.102"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.271" />

    <EditText
        android:id="@+id/txt_login_username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.905"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.256" />

    <EditText
        android:id="@+id/txt_login_password"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="text"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.91"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.412" />

    <Button
        android:id="@+id/btn_login_signup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#1E88E5"
        android:backgroundTint="#1E88E5"
        android:text="Sign In"
        android:textColorLink="#1E88E5"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.423"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.628" />
</androidx.constraintlayout.widget.ConstraintLayout>

login.java
package com.example.signup;


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;

public class Login extends AppCompatActivity implements View.OnClickListener {

    EditText txtLoginUsername,txtLoginPassword;
    Button btnLogin;

    String user,pass;
    int count = 0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        txtLoginUsername = (EditText)
                findViewById(R.id.txt_login_username);
        txtLoginPassword = (EditText)
                findViewById(R.id.txt_login_password);
        btnLogin = (Button) findViewById(R.id.btn_login_signup);
        btnLogin.setOnClickListener(this);

        Bundle bundle = getIntent().getBundleExtra("data");
        user = bundle.getString("user");
        pass = bundle.getString("pass");

    }
    @Override
    public void onClick(View v) {
        String user1 = txtLoginUsername.getText().toString();
        String pass1 = txtLoginPassword.getText().toString();

        if(user.equals(user1)&&pass.equals(pass1)) {
            Toast.makeText(this,"Login Successful",Toast.LENGTH_LONG).show();
        }
        else {
            count++;
            if(count == 3)
            {
                btnLogin.setEnabled(false);
                Toast.makeText(this,"Failed Login Attempts",Toast.LENGTH_LONG).show();
            }
            else {
                Toast.makeText(this,"Login Failed"+count,Toast.LENGTH_LONG).show();
            }
        }

    }
}

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