feat: add calculator to app

app/src/main/AndroidManifest.xml

@@ -129,6 +129,8 @@
                 <data android:scheme="file" />
             </intent-filter>
         </activity>
+        <activity android:name=".others.calc.CalcActivity"
+            android:parentActivityName=".MainActivity" />
         <activity android:name=".settings.FAQActivity" />
         <activity android:name=".settings.ReaderSettingsActivity" />
         <activity android:name=".settings.UserInterfaceSettingsActivity" />

app/src/main/java/ani/dantotsu/MainActivity.kt

@@ -48,6 +48,7 @@ import ani.dantotsu.home.NoInternet
 import ani.dantotsu.media.MediaDetailsActivity
 import ani.dantotsu.notifications.TaskScheduler
 import ani.dantotsu.others.CustomBottomDialog
+import ani.dantotsu.others.calc.CalcActivity
 import ani.dantotsu.profile.ProfileActivity
 import ani.dantotsu.profile.activity.FeedActivity
 import ani.dantotsu.profile.activity.NotificationActivity
@@ -100,6 +101,20 @@ class MainActivity : AppCompatActivity() {
         setContentView(binding.root)
 
         TaskScheduler.scheduleSingleWork(this)
+        if (!CalcActivity.hasPermission) {
+            val pin: String = PrefManager.getVal(PrefName.AppPassword)
+            if (pin.isNotEmpty()) {
+                ContextCompat.startActivity(
+                    this@MainActivity,
+                    Intent(this@MainActivity, CalcActivity::class.java)
+                        .putExtra("code", pin)
+                        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK),
+                    null
+                )
+                finish()
+                return
+            }
+        }
 
         val action = intent.action
         val type = intent.type

app/src/main/java/ani/dantotsu/notifications/subscription/SubscriptionHelper.kt

@@ -148,7 +148,11 @@ class SubscriptionHelper {
             val name: String,
             val image: String?,
             val banner: String? = null
-        ) : java.io.Serializable
+        ) : java.io.Serializable {
+            companion object {
+                private const val serialVersionUID = 1L
+            }
+        }
 
         private const val SUBSCRIPTIONS = "subscriptions"
 

app/src/main/java/ani/dantotsu/others/calc/CalcActivity.kt

@@ -0,0 +1,120 @@
+package ani.dantotsu.others.calc
+
+import android.content.Intent
+import android.os.Bundle
+import android.text.Spannable
+import android.text.SpannableString
+import android.text.style.ForegroundColorSpan
+import android.view.ViewGroup
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.core.view.updateLayoutParams
+import ani.dantotsu.MainActivity
+import ani.dantotsu.R
+import ani.dantotsu.databinding.ActivityCalcBinding
+import ani.dantotsu.getThemeColor
+import ani.dantotsu.initActivity
+import ani.dantotsu.navBarHeight
+import ani.dantotsu.statusBarHeight
+import ani.dantotsu.themes.ThemeManager
+import ani.dantotsu.util.NumberConverter.Companion.toBinary
+import ani.dantotsu.util.NumberConverter.Companion.toHex
+
+class CalcActivity : AppCompatActivity() {
+    private lateinit var binding: ActivityCalcBinding
+    private lateinit var code: String
+    private val stack = CalcStack()
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        ThemeManager(this).applyTheme()
+        initActivity(this)
+        binding = ActivityCalcBinding.inflate(layoutInflater)
+        binding.mainContainer.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+            topMargin += statusBarHeight
+            bottomMargin = navBarHeight
+        }
+        setContentView(binding.root)
+        code = intent.getStringExtra("code") ?: "0"
+
+        binding.apply {
+            button0.setOnClickListener { stack.add('0'); updateDisplay() }
+            button1.setOnClickListener { stack.add('1'); updateDisplay() }
+            button2.setOnClickListener { stack.add('2'); updateDisplay() }
+            button3.setOnClickListener { stack.add('3'); updateDisplay() }
+            button4.setOnClickListener { stack.add('4'); updateDisplay() }
+            button5.setOnClickListener { stack.add('5'); updateDisplay() }
+            button6.setOnClickListener { stack.add('6'); updateDisplay() }
+            button7.setOnClickListener { stack.add('7'); updateDisplay() }
+            button8.setOnClickListener { stack.add('8'); updateDisplay() }
+            button9.setOnClickListener { stack.add('9'); updateDisplay() }
+            buttonDot.setOnClickListener { stack.add('.'); updateDisplay() }
+            buttonAdd.setOnClickListener { stack.add('+'); updateDisplay() }
+            buttonSubtract.setOnClickListener { stack.add('-'); updateDisplay() }
+            buttonMultiply.setOnClickListener { stack.add('*'); updateDisplay() }
+            buttonDivide.setOnClickListener { stack.add('/'); updateDisplay() }
+            buttonEquals.setOnClickListener {
+                try {
+                    val ans = stack.evaluate()
+                    updateDisplay()
+                    binding.displayBinary.text = ans.toBinary()
+                    binding.displayHex.text = ans.toHex()
+                } catch (e: Exception) {
+                    display.text = getString(R.string.error)
+                }
+            }
+            buttonClear.setOnClickListener {
+                stack.clear()
+                binding.displayBinary.text = ""
+                binding.displayHex.text = ""
+                binding.display.text = "0"
+            }
+            buttonBackspace.setOnClickListener {
+                stack.remove()
+                updateDisplay()
+            }
+            display.text = "0"
+        }
+    }
+
+    private fun success() {
+        hasPermission = true
+        ContextCompat.startActivity(
+            this,
+            Intent(this, MainActivity::class.java)
+                .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK),
+            null
+        )
+    }
+
+    private fun updateDisplay() {
+        if (stack.getExpression().isEmpty()) {
+            binding.display.text = "0"
+            return
+        }
+        val expression = stack.getExpression().replace("*", "×").replace("/", "÷")
+        val spannable = SpannableString(expression)
+
+        val operators = arrayOf('+', '-', '×', '÷')
+
+        expression.forEachIndexed { index, char ->
+            if (char in operators) {
+                val color = getThemeColor(com.google.android.material.R.attr.colorSecondary)
+                spannable.setSpan(
+                    ForegroundColorSpan(color),
+                    index,
+                    index + 1,
+                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
+                )
+            }
+        }
+        binding.display.text = spannable
+        val text = binding.display.text.toString()
+        if (text == code) {
+            success()
+        }
+    }
+
+    companion object {
+        var hasPermission = false
+    }
+}

app/src/main/java/ani/dantotsu/others/calc/CalcStack.kt

@@ -0,0 +1,103 @@
+package ani.dantotsu.others.calc
+
+import java.util.Stack
+
+class CalcStack {
+    private var expression: String = ""
+    private val maxExpressionLength = 256
+
+    fun evaluate(): Double {
+        val ops = Stack<Char>()
+        val values = Stack<Double>()
+
+        var i = 0
+        while (i < expression.length) {
+            when {
+                expression[i] == ' ' -> i++
+                expression[i].isDigit() || expression[i] == '.' -> {
+                    var value = 0.0
+                    var isDecimal = false
+                    var decimalFactor = 0.1
+                    while (i < expression.length && (expression[i].isDigit() || expression[i] == '.' && !isDecimal)) {
+                        if (expression[i] == '.') {
+                            isDecimal = true
+                        } else if (!isDecimal) {
+                            value = value * 10 + (expression[i] - '0')
+                        } else {
+                            value += (expression[i] - '0') * decimalFactor
+                            decimalFactor *= 0.1
+                        }
+                        i++
+                    }
+                    values.push(value)
+                    i-- // to compensate the additional i++ in the loop
+                }
+
+                else -> {
+                    while (!ops.isEmpty() && precedence(ops.peek()) >= precedence(expression[i])) {
+                        val val2 = values.pop()
+                        val val1 = values.pop()
+                        val op = ops.pop()
+                        values.push(applyOp(val1, val2, op))
+                    }
+                    ops.push(expression[i])
+                }
+            }
+            i++
+        }
+
+        while (!ops.isEmpty()) {
+            val val2 = values.pop()
+            val val1 = values.pop()
+            val op = ops.pop()
+            values.push(applyOp(val1, val2, op))
+        }
+
+
+        val ans = values.pop()
+        expression = ans.toString()
+        return ans
+    }
+
+    fun add(c: Char) {
+        if (expression.length >= maxExpressionLength) return
+        expression += c
+    }
+
+    fun clear() {
+        expression = ""
+    }
+
+    fun remove() {
+        if (expression.isNotEmpty()) {
+            expression = expression.substring(0, expression.length - 1)
+        }
+    }
+
+    fun getExpression(): String {
+        return expression
+    }
+
+
+    private fun precedence(op: Char): Int {
+        return when (op) {
+            '+', '-' -> 1
+            '*', '/' -> 2
+            else -> -1
+        }
+    }
+
+    private fun applyOp(a: Double, b: Double, op: Char): Double {
+        return when (op) {
+            '+' -> a + b
+            '-' -> a - b
+            '*' -> a * b
+            '/' -> {
+                if (b == 0.0) throw UnsupportedOperationException("Cannot divide by zero.")
+                a / b
+            }
+
+            else -> 0.0
+        }
+    }
+}

app/src/main/java/ani/dantotsu/settings/SettingsCommonActivity.kt

@@ -4,12 +4,11 @@ import android.app.AlertDialog
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
-import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.inputmethod.EditorInfo
 import android.widget.ArrayAdapter
-import android.widget.TextView
+import android.widget.EditText
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.updateLayoutParams
@@ -41,6 +40,7 @@ import kotlinx.coroutines.launch
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 
+
 class SettingsCommonActivity : AppCompatActivity() {
     private lateinit var binding: ActivitySettingsCommonBinding
     private lateinit var launcher: LauncherWrapper
@@ -169,6 +169,51 @@ class SettingsCommonActivity : AppCompatActivity() {
                             dialog.window?.setDimAmount(0.8f)
                         }
                     ),
+                    Settings(
+                        type = 1,
+                        name = getString(R.string.app_lock),
+                        desc = getString(R.string.app_lock_desc),
+                        icon = R.drawable.ic_round_lock_open_24,
+                        onClick = {
+                            val passwordDialog = AlertDialog.Builder(context, R.style.MyPopup)
+                                .setTitle(R.string.download_manager)
+                                .setView(R.layout.dialog_set_password)
+                                .setPositiveButton(R.string.ok) { dialog, _ ->
+                                    val passwordInput =
+                                        (dialog as AlertDialog).findViewById<EditText>(R.id.passwordInput)
+                                    val confirmPasswordInput =
+                                        dialog.findViewById<EditText>(R.id.confirmPasswordInput)
+
+                                    val password = passwordInput?.text.toString()
+                                    val confirmPassword = confirmPasswordInput?.text.toString()
+
+                                    if (password == confirmPassword && password.isNotEmpty()) {
+                                        PrefManager.setVal(PrefName.AppPassword, password)
+                                        toast(R.string.success)
+                                        dialog.dismiss()
+                                    } else {
+                                        toast(R.string.password_mismatch)
+                                    }
+                                }
+                                .setNegativeButton(R.string.cancel) { dialog, _ ->
+                                    dialog.dismiss()
+                                }
+                                .setNeutralButton(R.string.remove) { dialog, _ ->
+                                    PrefManager.setVal(PrefName.AppPassword, "")
+                                    toast(R.string.success)
+                                    dialog.dismiss()
+                                }
+                                .create()
+
+                            passwordDialog.window?.setDimAmount(0.8f)
+                            passwordDialog.setOnShowListener {
+                                passwordDialog.findViewById<EditText>(R.id.passwordInput)
+                                    ?.requestFocus()
+                            }
+                            passwordDialog.show()
+                        }
+
+                    ),
                     Settings(
                         type = 1,
                         name = getString(R.string.backup_restore),

app/src/main/java/ani/dantotsu/settings/saving/Preferences.kt

@@ -201,4 +201,5 @@ enum class PrefName(val data: Pref) {  //TODO: Split this into multiple files
     AnilistUserId(Pref(Location.Protected, String::class, "")),
     MALCodeChallenge(Pref(Location.Protected, String::class, "")),
     MALToken(Pref(Location.Protected, MAL.ResponseToken::class, "")),
+    AppPassword(Pref(Location.Protected, String::class, "")),
 }

app/src/main/java/ani/dantotsu/util/NumberConverter.kt

@@ -0,0 +1,51 @@
+package ani.dantotsu.util
+
+import java.util.Locale
+
+class NumberConverter {
+    companion object {
+        fun Number.toBinary(): String {
+            return when (this) {
+                is Int -> Integer.toBinaryString(this)
+                is Long -> java.lang.Long.toBinaryString(this)
+                is Short -> Integer.toBinaryString(this.toInt())
+                is Byte -> Integer.toBinaryString(this.toInt())
+                is Double -> doubleToBinary(this)
+                is Float -> floatToBinary(this)
+                else -> throw IllegalArgumentException("Unsupported number type")
+            }
+        }
+
+        fun Number.toHex(): String {
+            return when (this) {
+                is Int -> Integer.toHexString(this)
+                is Long -> java.lang.Long.toHexString(this)
+                is Short -> Integer.toHexString(this.toInt())
+                is Byte -> Integer.toHexString(this.toInt())
+                is Double -> doubleToHex(this)
+                is Float -> floatToHex(this)
+                else -> throw IllegalArgumentException("Unsupported number type")
+            }
+        }
+
+        private fun doubleToHex(number: Double): String {
+            val longBits = java.lang.Double.doubleToLongBits(number)
+            return "0x" + java.lang.Long.toHexString(longBits).uppercase(Locale.ROOT)
+        }
+
+        private fun floatToHex(number: Float): String {
+            val intBits = java.lang.Float.floatToIntBits(number)
+            return "0x" + Integer.toHexString(intBits).uppercase(Locale.ROOT)
+        }
+
+        private fun doubleToBinary(number: Double): String {
+            val longBits = java.lang.Double.doubleToLongBits(number)
+            return java.lang.Long.toBinaryString(longBits)
+        }
+
+        private fun floatToBinary(number: Float): String {
+            val intBits = java.lang.Float.floatToIntBits(number)
+            return Integer.toBinaryString(intBits)
+        }
+    }
+}

app/src/main/res/drawable/rounded_bottom_corners.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="?attr/colorSurfaceVariant" />
+    <corners
+        android:topLeftRadius="0dp"
+        android:topRightRadius="0dp"
+        android:bottomLeftRadius="16dp"
+        android:bottomRightRadius="16dp" />
+</shape>

app/src/main/res/drawable/rounded_top_corners.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <solid android:color="?attr/colorSurfaceVariant" />
+    <corners
+        android:topLeftRadius="16dp"
+        android:topRightRadius="16dp"
+        android:bottomLeftRadius="0dp"
+        android:bottomRightRadius="0dp" />
+</shape>

app/src/main/res/layout/activity_calc.xml

@@ -0,0 +1,383 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout 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:background="@color/bg">
+
+    <LinearLayout
+        android:id="@+id/mainContainer"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_marginTop="32dp"
+        android:layout_gravity="bottom|center_horizontal"
+        android:background="@color/bg"
+        android:orientation="vertical"
+        tools:context=".MainActivity">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginHorizontal="8dp"
+            android:layout_marginBottom="32dp"
+            android:orientation="vertical">
+
+            <TextView
+                android:id="@+id/display"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="32dp"
+                android:layout_marginEnd="32dp"
+                android:background="@drawable/rounded_top_corners"
+                android:gravity="end"
+                android:maxLines="1"
+                android:textColor="?attr/colorOnSurfaceVariant"
+                android:textSize="48sp"
+                tools:ignore="ButtonStyle,HardcodedText" />
+
+            <TextView
+                android:id="@+id/displayBinary"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="32dp"
+                android:layout_marginTop="2dp"
+                android:layout_marginEnd="32dp"
+                android:background="?attr/colorSurfaceVariant"
+                android:gravity="end"
+                android:maxLines="1"
+                android:textColor="?attr/colorOnSurfaceVariant"
+                android:textSize="28sp"
+                tools:ignore="ButtonStyle,HardcodedText" />
+
+            <TextView
+                android:id="@+id/displayHex"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="32dp"
+                android:layout_marginTop="2dp"
+                android:layout_marginEnd="32dp"
+                android:background="@drawable/rounded_bottom_corners"
+                android:gravity="end"
+                android:maxLines="1"
+                android:textColor="?attr/colorOnSurfaceVariant"
+                android:textSize="28sp"
+                tools:ignore="ButtonStyle,HardcodedText" />
+        </LinearLayout>
+
+        <FrameLayout
+            android:id="@+id/fillerLayout"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1" />
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal|bottom"
+            android:orientation="vertical">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:orientation="horizontal">
+
+                <Button
+                    android:id="@+id/button7"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="7"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button8"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:layout_marginEnd="16dp"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="8"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button9"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="9"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonDivide"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="÷"
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:orientation="horizontal">
+
+                <Button
+                    android:id="@+id/button4"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="4"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button5"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:layout_marginEnd="16dp"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="5"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button6"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="6"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonMultiply"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="×"
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:orientation="horizontal">
+
+                <Button
+                    android:id="@+id/button1"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="1"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button2"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:layout_marginEnd="16dp"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="2"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/button3"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="3"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonSubtract"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="−"
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:orientation="horizontal">
+
+                <Button
+                    android:id="@+id/button0"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="0"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonDot"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:layout_marginEnd="16dp"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="."
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonBackspace"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:backgroundTint="?attr/colorSurfaceVariant"
+                    android:elegantTextHeight="true"
+                    android:text="⌫"
+                    android:textColor="?attr/colorOnSurfaceVariant"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonAdd"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginStart="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="+"
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+            </LinearLayout>
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:layout_marginTop="16dp"
+                android:orientation="horizontal">
+
+                <Button
+                    android:id="@+id/buttonClear"
+                    android:layout_width="70dp"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginTop="16dp"
+                    android:layout_marginEnd="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="C"
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+
+                <Button
+                    android:id="@+id/buttonEquals"
+                    android:layout_width="match_parent"
+                    android:layout_height="64dp"
+                    android:layout_gravity="bottom|end"
+                    android:layout_marginTop="16dp"
+                    android:backgroundTint="?attr/colorPrimary"
+                    android:elegantTextHeight="true"
+                    android:text="="
+                    android:textColor="?attr/colorOnPrimary"
+                    app:cornerRadius="16dp"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    tools:ignore="ButtonStyle,HardcodedText" />
+            </LinearLayout>
+        </LinearLayout>
+    </LinearLayout>
+</FrameLayout>

app/src/main/res/layout/dialog_set_password.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <EditText
+        android:id="@+id/passwordInput"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="@string/enter_password"
+        android:maxLength="32"
+        android:inputType="numberPassword" />
+
+    <EditText
+        android:id="@+id/confirmPasswordInput"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="@string/confirm_password"
+        android:inputType="numberPassword"
+        android:maxLength="32"
+        android:layout_marginTop="16dp" />
+
+</LinearLayout>

app/src/main/res/values/colors.xml

@@ -557,7 +557,7 @@
     <!-- theme 9 -->
     <color name="seed_9">#c9000b</color>
     <color name="md_theme_light_9_primary">#FF9800</color>
-    <color name="md_theme_light_9_onPrimary">#FFFFFF</color>
+    <color name="md_theme_light_9_onPrimary">#201A19</color>
     <color name="md_theme_light_9_primaryContainer">#FFCF87</color>
     <color name="md_theme_light_9_onPrimaryContainer">#410001</color>
     <color name="md_theme_light_9_secondary">#FF5722</color>
@@ -587,7 +587,7 @@
     <color name="md_theme_light_9_outlineVariant">#D8C2BE</color>
     <color name="md_theme_light_9_scrim">#000000</color>
     <color name="md_theme_dark_9_primary">#FFB343</color>
-    <color name="md_theme_dark_9_onPrimary">#FAE965</color>
+    <color name="md_theme_dark_9_onPrimary">#322E0A</color>
     <color name="md_theme_dark_9_primaryContainer">#FF6600</color>
     <color name="md_theme_dark_9_onPrimaryContainer">#FFDAD5</color>
     <color name="md_theme_dark_9_secondary">#FF7700</color>

app/src/main/res/values/strings.xml

@@ -1020,4 +1020,8 @@ Non quae tempore quo provident laudantium qui illo dolor vel quia dolor et exerc
     <string name="failed_to_fix">Failed to fix</string>
     <string name="running_fixes">Running Fixes…</string>
     <string name="test_search">Test Search</string>
+    <string name="app_lock">App Lock</string>
+    <string name="app_lock_desc">Lock the app with a password\n( ͡° ͜ʖ ͡°)</string>
+    <string name="confirm_password">Confirm Password</string>
+    <string name="password_mismatch">Passwords do not match or are empty!</string>
 </resources>