Code for questions

Question1/app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    namespace 'com.example.registrationapp'
+    compileSdk 36
+
+    defaultConfig {
+        applicationId "com.example.registrationapp"
+        minSdk 24
+        targetSdk 36
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.11.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+}

Question1/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AppCompat.Light.DarkActionBar"
+        tools:targetApi="31">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <activity android:name=".DisplayActivity" />
+
+    </application>
+
+</manifest>

Question1/app/src/main/java/com/example/registrationapp/DisplayActivity.java

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+package com.example.registrationapp;
+
+import android.os.Bundle;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class DisplayActivity extends AppCompatActivity {
+
+    private TextView textViewName, textViewEmail, textViewGender, textViewDOB;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_display);
+
+        // Initialize views
+        textViewName = findViewById(R.id.textViewName);
+        textViewEmail = findViewById(R.id.textViewEmail);
+        textViewGender = findViewById(R.id.textViewGender);
+        textViewDOB = findViewById(R.id.textViewDOB);
+
+        // Get data from intent
+        String name = getIntent().getStringExtra("name");
+        String email = getIntent().getStringExtra("email");
+        String gender = getIntent().getStringExtra("gender");
+        String dob = getIntent().getStringExtra("dob");
+
+        // Display the information (password is NOT shown)
+        textViewName.setText(name);
+        textViewEmail.setText(email);
+        textViewGender.setText(gender);
+        textViewDOB.setText(dob);
+    }
+}

Question1/app/src/main/java/com/example/registrationapp/MainActivity.java

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+package com.example.registrationapp;
+
+import android.app.DatePickerDialog;
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import android.widget.DatePicker;
+import android.widget.EditText;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import java.util.Calendar;
+import java.util.regex.Pattern;
+
+public class MainActivity extends AppCompatActivity {
+
+    private EditText editTextName, editTextEmail, editTextDOB, editTextPassword;
+    private RadioGroup radioGroupGender;
+    private Button buttonRegister;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // Initialize views
+        editTextName = findViewById(R.id.editTextName);
+        editTextEmail = findViewById(R.id.editTextEmail);
+        editTextDOB = findViewById(R.id.editTextDOB);
+        editTextPassword = findViewById(R.id.editTextPassword);
+        radioGroupGender = findViewById(R.id.radioGroupGender);
+        buttonRegister = findViewById(R.id.buttonRegister);
+
+        // DatePickerDialog for Date of Birth
+        editTextDOB.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                showDatePickerDialog();
+            }
+        });
+
+        // Register button click listener
+        buttonRegister.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                validateAndRegister();
+            }
+        });
+    }
+
+    private void showDatePickerDialog() {
+        final Calendar calendar = Calendar.getInstance();
+        int year = calendar.get(Calendar.YEAR);
+        int month = calendar.get(Calendar.MONTH);
+        int day = calendar.get(Calendar.DAY_OF_MONTH);
+
+        DatePickerDialog datePickerDialog = new DatePickerDialog(
+                MainActivity.this,
+                new DatePickerDialog.OnDateSetListener() {
+                    @Override
+                    public void onDateSet(DatePicker view, int selectedYear, int selectedMonth, int selectedDay) {
+                        // Month is 0-indexed, so add 1
+                        String date = selectedDay + "/" + (selectedMonth + 1) + "/" + selectedYear;
+                        editTextDOB.setText(date);
+                    }
+                },
+                year, month, day
+        );
+        datePickerDialog.show();
+    }
+
+    private void validateAndRegister() {
+        String name = editTextName.getText().toString().trim();
+        String email = editTextEmail.getText().toString().trim();
+        String dob = editTextDOB.getText().toString().trim();
+        String password = editTextPassword.getText().toString().trim();
+        int selectedGenderId = radioGroupGender.getCheckedRadioButtonId();
+
+        // Check fields from top to bottom, show only one toast at a time
+        if (name.isEmpty()) {
+            Toast.makeText(this, "Please enter your name", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (email.isEmpty()) {
+            Toast.makeText(this, "Please enter your email address", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        // Validate email format
+        if (!isValidEmail(email)) {
+            Toast.makeText(this, "Please enter a valid email address", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (selectedGenderId == -1) {
+            Toast.makeText(this, "Please select your gender", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (dob.isEmpty()) {
+            Toast.makeText(this, "Please select your date of birth", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (password.isEmpty()) {
+            Toast.makeText(this, "Password should be at least 8 characters long", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        // Validate password
+        if (password.length() < 8) {
+            Toast.makeText(this, "Password should be at least 8 characters long", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        if (!isValidPassword(password)) {
+            Toast.makeText(this, "Password should contain 1 numeric digit, 1 uppercase letter, and 1 special character", Toast.LENGTH_SHORT).show();
+            return;
+        }
+
+        // Get selected gender text
+        RadioButton selectedGenderButton = findViewById(selectedGenderId);
+        String gender = selectedGenderButton.getText().toString();
+
+        // All validations passed — open second activity
+        Intent intent = new Intent(MainActivity.this, DisplayActivity.class);
+        intent.putExtra("name", name);
+        intent.putExtra("email", email);
+        intent.putExtra("gender", gender);
+        intent.putExtra("dob", dob);
+        startActivity(intent);
+    }
+
+    private boolean isValidEmail(String email) {
+        // A valid email: username@domain.com
+        // Username: letters, numbers, underscores, periods, dashes
+        // Domain: multiple parts separated by dots
+        String emailPattern = "^[a-zA-Z0-9._-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$";
+        return Pattern.matches(emailPattern, email);
+    }
+
+    private boolean isValidPassword(String password) {
+        // Must contain at least one numeric digit
+        boolean hasDigit = false;
+        // Must contain at least one uppercase letter
+        boolean hasUppercase = false;
+        // Must contain at least one special character from @#$%^&+=!
+        boolean hasSpecialChar = false;
+
+        String specialCharacters = "@#$%^&+=!";
+
+        for (char c : password.toCharArray()) {
+            if (Character.isDigit(c)) {
+                hasDigit = true;
+            } else if (Character.isUpperCase(c)) {
+                hasUppercase = true;
+            } else if (specialCharacters.indexOf(c) != -1) {
+                hasSpecialChar = true;
+            }
+        }
+
+        return hasDigit && hasUppercase && hasSpecialChar;
+    }
+}

Question1/app/src/main/res/drawable/app_logo.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="150dp"
+    android:height="150dp"
+    android:viewportWidth="150"
+    android:viewportHeight="150">
+    <!-- Background circle -->
+    <path
+        android:fillColor="#6200EE"
+        android:pathData="M75,75m-70,0a70,70 0,1 1,140 0a70,70 0,1 1,-140 0" />
+    <!-- Person icon -->
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M75,50c8.28,0 15,-6.72 15,-15s-6.72,-15 -15,-15 -15,6.72 -15,15 6.72,15 15,15z" />
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M75,60c-20,0 -40,10 -40,20v10h80v-10c0,-10 -20,-20 -40,-20z" />
+</vector>

Question1/app/src/main/res/drawable/ic_calendar.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#757575">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M19,3h-1V1h-2v2H8V1H6v2H5C3.89,3 3.01,3.9 3.01,5L3,19c0,1.1 0.89,2 2,2h14c1.1,0 2,-0.9 2,-2V5c0,-1.1 -0.9,-2 -2,-2zM19,19H5V8h14v11zM9,10H7v2h2v-2zM13,10h-2v2h2v-2zM17,10h-2v2h2v-2z" />
+</vector>

Question1/app/src/main/res/drawable/ic_email.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#757575">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M20,4H4C2.9,4 2.01,4.9 2.01,6L2,18c0,1.1 0.9,2 2,2h16c1.1,0 2,-0.9 2,-2V6c0,-1.1 -0.9,-2 -2,-2zM20,8l-8,5 -8,-5V6l8,5 8,-5v2z" />
+</vector>

Question1/app/src/main/res/drawable/ic_lock.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#757575">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M18,8h-1V6c0,-2.76 -2.24,-5 -5,-5S7,3.24 7,6v2H6c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V10c0,-1.1 -0.9,-2 -2,-2zM12,17c-1.1,0 -2,-0.9 -2,-2s0.9,-2 2,-2 2,0.9 2,2 -0.9,2 -2,2zM15.1,8H8.9V6c0,-1.71 1.39,-3.1 3.1,-3.1 1.71,0 3.1,1.39 3.1,3.1v2z" />
+</vector>

Question1/app/src/main/res/drawable/ic_person.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#757575">
+    <path
+        android:fillColor="#000000"
+        android:pathData="M12,12c2.21,0 4,-1.79 4,-4s-1.79,-4 -4,-4 -4,1.79 -4,4 1.79,4 4,4zM12,14c-2.67,0 -8,1.34 -8,4v2h16v-2c0,-2.66 -5.33,-4 -8,-4z" />
+</vector>