app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
-
+    <uses-permission android:name="android.permission.VIBRATE" />
     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_timer"
@@ -9,6 +9,7 @@
         android:theme="@style/Theme.CountdownTimer">
         <activity
             android:name=".MainActivity"
+            android:configChanges="orientation|screenSize"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -16,5 +17,4 @@
             </intent-filter>
         </activity>
     </application>
-
 </manifest>

app/src/main/java/com/example/countdowntimer/CountdownCanvasView.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.graphics.Canvas
 import android.graphics.Color
 import android.graphics.Paint
+import android.graphics.RectF
 import android.util.AttributeSet
 import android.view.View
 
@@ -14,12 +15,24 @@ class CountdownCanvasView @JvmOverloads constructor(
 ) : View(context, attrs, defStyleAttr) {
 
     private var textToDraw: String = ""
+    private var progressFraction: Float = 1.0f
     private val paint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
-        color = Color.parseColor("#6750A4") // Using the same primary purple
-        textSize = 180f // Roughly equivalent to 72sp depending on density
+        color = Color.parseColor("#6750A4")
+        textSize = 180f
         textAlign = Paint.Align.CENTER
         isFakeBoldText = false
     }
+    private val ringPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#6750A4")
+        style = Paint.Style.STROKE
+        strokeWidth = 16f
+    }
+    private val ringBgPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.parseColor("#D0BCFF")
+        style = Paint.Style.STROKE
+        strokeWidth = 16f
+    }
+    private val rectF = RectF()
 
     fun setText(text: String) {
         if (textToDraw != text) {
@@ -28,15 +41,34 @@ class CountdownCanvasView @JvmOverloads constructor(
         }
     }
 
+    fun setProgress(fraction: Float) {
+        progressFraction = fraction.coerceIn(0f, 1f)
+        invalidate()
+    }
+
+    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
+        super.onSizeChanged(w, h, oldw, oldh)
+        val inset = ringPaint.strokeWidth / 2f + 12f
+        rectF.set(inset, inset, w - inset, h - inset)
+    }
+
     override fun onDraw(canvas: Canvas) {
         super.onDraw(canvas)
 
-        if (textToDraw.isEmpty()) return
+        if (textToDraw.isEmpty() || rectF.width() <= 0f) return
 
+        val cx = rectF.centerX()
+        val cy = rectF.centerY()
+
+        // Draw full background ring (always visible track)
+        val bgRect = RectF(rectF.left, rectF.top, rectF.right, rectF.bottom)
+        canvas.drawArc(bgRect, -90f, 360f, false, ringBgPaint)
+        // Draw progress arc on top (remaining time, starts at 12 o'clock)
+        canvas.drawArc(rectF, -90f, 360f * progressFraction, false, ringPaint)
+
+        // Draw text
         val fontMetrics = paint.fontMetrics
-        val x = width / 2f
-        val y = (height / 2f) - ((fontMetrics.descent + fontMetrics.ascent) / 2f)
-
-        canvas.drawText(textToDraw, x, y, paint)
+        val textY = (cy - (fontMetrics.descent + fontMetrics.ascent) / 2f)
+        canvas.drawText(textToDraw, cx, textY, paint)
     }
 }

app/src/main/java/com/example/countdowntimer/CountdownDialog.kt

@@ -2,21 +2,28 @@ package com.example.countdowntimer
 
 import android.app.Dialog
 import android.content.Context
+import android.content.SharedPreferences
 import android.media.AudioManager
 import android.media.ToneGenerator
 import android.os.Bundle
 import android.os.CountDownTimer
+import android.os.Vibrator
 import android.view.View
 import android.view.WindowManager
 import android.widget.Button
 
-class CountdownDialog(private val context: Context, private val durationMillis: Long) : Dialog(context) {
+class CountdownDialog(
+    private val context: Context,
+    private val durationMillis: Long,
+    private val prefs: SharedPreferences
+) : Dialog(context) {
     private lateinit var cvCountdown: CountdownCanvasView
     private lateinit var btnStop: Button
     private lateinit var btnRestart: Button
     private lateinit var btnDismiss: Button
     private var timer: CountDownTimer? = null
     private var toneGenerator: ToneGenerator? = null
+    private var vibrator: Vibrator? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -38,6 +45,7 @@ class CountdownDialog(private val context: Context, private val durationMillis:
         btnRestart = findViewById(R.id.btnRestart)
         btnDismiss = findViewById(R.id.btnDismiss)
         toneGenerator = ToneGenerator(AudioManager.STREAM_ALARM, 100)
+        vibrator = context.getSystemService(Context.VIBRATOR_SERVICE) as Vibrator
 
         btnStop.setOnClickListener { cancelTimer() }
         btnRestart.setOnClickListener { restartTimer() }
@@ -47,22 +55,34 @@ class CountdownDialog(private val context: Context, private val durationMillis:
     }
 
     private fun startTimer() {
+        cvCountdown.setProgress(1f)
         timer = object : CountDownTimer(durationMillis, 1000) {
             override fun onTick(millisUntilFinished: Long) {
-                val secondsLeft = (millisUntilFinished / 1000).toInt() + 1
-                if (secondsLeft < 10) { 
-                    cvCountdown.setText(secondsLeft.toString())
-                } else {
+                val progress = millisUntilFinished.toFloat() / durationMillis
+                cvCountdown.setProgress(progress)
+
+                if (millisUntilFinished >= durationMillis) {
                     cvCountdown.setText(context.getString(R.string.countdown_text))
+                } else {
+                    val secondsLeft = (millisUntilFinished / 1000).toInt() + 1
+                    cvCountdown.setText(secondsLeft.toString())
                 }
-                if (secondsLeft in 1..3) {
+
+                if (millisUntilFinished <= 3000 && millisUntilFinished > 1000) {
                     playTone(ToneGenerator.TONE_PROP_BEEP)
+                    if (prefs.getBoolean("vibration", true)) {
+                        vibrator?.vibrate(50)
+                    }
                 }
             }
 
             override fun onFinish() {
                 cvCountdown.setText(context.getString(R.string.timer_zero))
+                cvCountdown.setProgress(0f)
                 playTone(ToneGenerator.TONE_SUP_CONFIRM, 500)
+                if (prefs.getBoolean("vibration", true)) {
+                    vibrator?.vibrate(200)
+                }
                 btnStop.visibility = View.GONE
                 btnRestart.visibility = View.GONE
                 btnDismiss.visibility = View.VISIBLE

app/src/main/java/com/example/countdowntimer/MainActivity.kt

@@ -1,18 +1,88 @@
 package com.example.countdowntimer
 
+import android.content.Context
+import android.content.SharedPreferences
 import android.os.Bundle
+import android.view.View
+import android.view.inputmethod.InputMethodManager
 import android.widget.Button
 import androidx.appcompat.app.AppCompatActivity
+import com.google.android.material.chip.ChipGroup
 
 class MainActivity : AppCompatActivity() {
-    private val TIMER_DURATION_MS = 10000L
+
+    companion object {
+        private const val PREFS_NAME = "timer_prefs"
+        private const val KEY_SELECTED_DURATION = "selected_duration"
+        private const val DEFAULT_DURATION = 10000L
+    }
+
+    private lateinit var prefs: SharedPreferences
+    private lateinit var btnDurationLabel: Button
+    private lateinit var hsvDurationOptions: View
+    private lateinit var chipGroup: ChipGroup
+    private var selectedDuration: Long = DEFAULT_DURATION
+
+    private fun durationToChipId(duration: Long): Int = when (duration) {
+        5000L -> R.id.chip5s
+        15000L -> R.id.chip15s
+        30000L -> R.id.chip30s
+        else -> R.id.chip10s
+    }
+
+    private fun chipIdToDuration(chipId: Int): Long = when (chipId) {
+        R.id.chip5s -> 5000L
+        R.id.chip10s -> 10000L
+        R.id.chip15s -> 15000L
+        R.id.chip30s -> 30000L
+        else -> DEFAULT_DURATION
+    }
+
+    private fun updateDurationLabel() {
+        btnDurationLabel.text = "${selectedDuration / 1000}s"
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+        selectedDuration = prefs.getLong(KEY_SELECTED_DURATION, DEFAULT_DURATION)
+
+        btnDurationLabel = findViewById(R.id.btnDurationLabel)
+        hsvDurationOptions = findViewById(R.id.hsvDurationOptions)
+        chipGroup = findViewById(R.id.chipGroup)
+
+        updateDurationLabel()
+
+        // Restore selected chip
+        val chipId = durationToChipId(selectedDuration)
+        chipGroup.check(chipId)
+
+        btnDurationLabel.setOnClickListener {
+            if (hsvDurationOptions.visibility == View.GONE) {
+                hsvDurationOptions.visibility = View.VISIBLE
+            } else {
+                hsvDurationOptions.visibility = View.GONE
+                (currentFocus ?: btnDurationLabel).let { focused ->
+                    focused.clearFocus()
+                    val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+                    imm.hideSoftInputFromWindow(hsvDurationOptions.windowToken, 0)
+                }
+            }
+        }
+
+        chipGroup.setOnCheckedChangeListener { _, checkedId ->
+            if (checkedId != -1) {
+                selectedDuration = chipIdToDuration(checkedId)
+                prefs.edit().putLong(KEY_SELECTED_DURATION, selectedDuration).apply()
+                updateDurationLabel()
+                hsvDurationOptions.visibility = View.GONE
+            }
+        }
+
         findViewById<Button>(R.id.btnStart).setOnClickListener {
-            CountdownDialog(this, TIMER_DURATION_MS).show()
+            CountdownDialog(this, selectedDuration, prefs).show()
         }
     }
 }

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

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#6750A4"
+        android:pathData="M7.41,8.59L12,13.17l4.59,-4.58L18,10l-6,6 -6,-6z"/>
+</vector>

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

@@ -110,12 +110,67 @@
                         </LinearLayout>
                     </LinearLayout>
 
+                    <com.google.android.material.button.MaterialButton
+                        android:id="@+id/btnDurationLabel"
+                        style="@style/Widget.Material3.Button.OutlinedButton"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="32dp"
+                        android:text="@string/start_timer"
+                        android:drawableEnd="@drawable/ic_keyboard_arrow_down"
+                        app:cornerRadius="20dp" />
+
+                    <HorizontalScrollView
+                        android:id="@+id/hsvDurationOptions"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginTop="8dp"
+                        android:scrollbars="none"
+                        android:visibility="gone">
+
+                        <com.google.android.material.chip.ChipGroup
+                            android:id="@+id/chipGroup"
+                            android:layout_width="wrap_content"
+                            android:layout_height="wrap_content"
+                            app:singleSelection="true">
+
+                            <com.google.android.material.chip.Chip
+                                android:id="@+id/chip5s"
+                                style="@style/Widget.Material3.Chip.Suggestion.Elevated"
+                                android:layout_width="wrap_content"
+                                android:layout_height="wrap_content"
+                                android:text="5s" />
+
+                            <com.google.android.material.chip.Chip
+                                android:id="@+id/chip10s"
+                                style="@style/Widget.Material3.Chip.Suggestion.Elevated"
+                                android:layout_width="wrap_content"
+                                android:layout_height="wrap_content"
+                                android:checked="true"
+                                android:text="10s" />
+
+                            <com.google.android.material.chip.Chip
+                                android:id="@+id/chip15s"
+                                style="@style/Widget.Material3.Chip.Suggestion.Elevated"
+                                android:layout_width="wrap_content"
+                                android:layout_height="wrap_content"
+                                android:text="15s" />
+
+                            <com.google.android.material.chip.Chip
+                                android:id="@+id/chip30s"
+                                style="@style/Widget.Material3.Chip.Suggestion.Elevated"
+                                android:layout_width="wrap_content"
+                                android:layout_height="wrap_content"
+                                android:text="30s" />
+                        </com.google.android.material.chip.ChipGroup>
+                    </HorizontalScrollView>
+
                     <com.google.android.material.button.MaterialButton
                         android:id="@+id/btnStart"
                         style="@style/Widget.Material3.Button"
                         android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:layout_marginTop="32dp"
+                        android:layout_marginTop="16dp"
                         android:text="@string/start_timer"
                         app:cornerRadius="20dp"
                         app:icon="@drawable/ic_play_arrow" />

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

@@ -18,16 +18,14 @@
 
     <com.example.countdowntimer.CountdownCanvasView
         android:id="@+id/cvCountdown"
-        android:layout_width="wrap_content"
+        android:layout_width="0dp"
         android:layout_height="0dp"
-        app:layout_constraintHeight_default="wrap"
-        app:layout_constrainedHeight="true"
         app:layout_constraintBottom_toTopOf="@id/btnStop"
+        app:layout_constraintDimensionRatio="1:1"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        android:minWidth="120dp"
-        android:minHeight="120dp" />
+        android:layout_margin="16dp" />
 
     <Button
         android:id="@+id/btnStop"

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

@@ -7,4 +7,8 @@
     <string name="instruction_volume">Ensure your bong is loaded</string>
     <string name="instruction_position">Find a comfortable position</string>
     <string name="instruction_distractions">Light your bowl and take your hit before you press the Start Timer button. HOLD YOUR HIT IN!</string>
+    <string name="pick_duration">Pick Duration</string>
+    <string name="settings">Settings</string>
+    <string name="vibration">Vibration</string>
+    <string name="sounds">Sounds</string>
 </resources>