bug fixes

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

@@ -3,6 +3,9 @@ package com.example.countdowntimer
 import android.content.Context
 import android.content.SharedPreferences
 import android.os.Bundle
+import android.os.VibrationEffect
+import android.os.Vibrator
+import android.os.VibratorManager
 import android.view.View
 import android.view.inputmethod.InputMethodManager
 import android.widget.Button
@@ -21,7 +24,9 @@ class MainActivity : AppCompatActivity() {
     private lateinit var btnDurationLabel: Button
     private lateinit var hsvDurationOptions: View
     private lateinit var chipGroup: ChipGroup
+    private lateinit var vibrator: Vibrator
     private var selectedDuration: Long = DEFAULT_DURATION
+    private var lastSelectedChipId: Int = -1
 
     private fun durationToChipId(duration: Long): Int = when (duration) {
         5000L -> R.id.chip5s
@@ -42,6 +47,16 @@ class MainActivity : AppCompatActivity() {
         btnDurationLabel.text = "${selectedDuration / 1000}s"
     }
 
+    private fun onChipClicked(chipId: Int) {
+        if (chipId == lastSelectedChipId) {
+            // Re-selection: provide feedback so user knows the selection is registered
+            vibrator.vibrate(VibrationEffect.createOneShot(15, VibrationEffect.DEFAULT_AMPLITUDE))
+            val originalText = btnDurationLabel.text
+            btnDurationLabel.text = "${selectedDuration / 1000}s!"
+            btnDurationLabel.postDelayed({ btnDurationLabel.text = originalText }, 300)
+        }
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
@@ -52,6 +67,8 @@ class MainActivity : AppCompatActivity() {
         btnDurationLabel = findViewById(R.id.btnDurationLabel)
         hsvDurationOptions = findViewById(R.id.hsvDurationOptions)
         chipGroup = findViewById(R.id.chipGroup)
+        val vibratorManager = getSystemService(Context.VIBRATOR_MANAGER_SERVICE) as VibratorManager
+        vibrator = vibratorManager.defaultVibrator
 
         updateDurationLabel()
 
@@ -72,15 +89,27 @@ class MainActivity : AppCompatActivity() {
             }
         }
 
-        chipGroup.setOnCheckedChangeListener { _, checkedId ->
+        chipGroup.setOnCheckedStateChangeListener { _, checkedIds ->
+            val checkedId = if (checkedIds.size > 0) checkedIds[0].toInt() else -1
             if (checkedId != -1) {
+                if (checkedId != lastSelectedChipId) {
+                    // New selection: update duration, save, and refresh label
                     selectedDuration = chipIdToDuration(checkedId)
                     prefs.edit().putLong(KEY_SELECTED_DURATION, selectedDuration).apply()
                     updateDurationLabel()
+                    lastSelectedChipId = checkedId
+                }
+                // Always close the panel on any selection
                 hsvDurationOptions.visibility = View.GONE
             }
         }
 
+        // Set individual click listeners to detect re-selection
+        findViewById<View>(R.id.chip5s).setOnClickListener { onChipClicked(R.id.chip5s) }
+        findViewById<View>(R.id.chip10s).setOnClickListener { onChipClicked(R.id.chip10s) }
+        findViewById<View>(R.id.chip15s).setOnClickListener { onChipClicked(R.id.chip15s) }
+        findViewById<View>(R.id.chip30s).setOnClickListener { onChipClicked(R.id.chip30s) }
+
         findViewById<View>(R.id.btnStart).setOnClickListener {
             CountdownDialog(this, selectedDuration, prefs).show()
         }

app/src/main/res/color/chip_duration_bg.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:state_checked="true" android:color="#81C784" />
+    <item android:state_checked="true" android:color="#2E7D32" />
-    <item android:color="#E8E8E8" />
+    <item android:color="#233024" />
 </selector>

app/src/main/res/color/chip_duration_stroke.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="true" android:color="#C8E6C9" />
+    <item android:color="#2E7D32" />
+</selector>

app/src/main/res/color/chip_duration_text.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:state_checked="true" android:color="#FFFFFF" />
+    <item android:color="#C8E6C9" />
+</selector>

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

@@ -170,17 +170,22 @@
                                 android:layout_height="wrap_content"
                                 android:minWidth="56dp"
                                 android:text="5s"
-                                app:chipBackgroundColor="@color/chip_duration_bg" />
+                                app:chipBackgroundColor="@color/chip_duration_bg"
+                                app:chipStrokeColor="@color/chip_duration_stroke"
+                                app:chipStrokeWidth="2dp"
+                                android:textColor="@color/chip_duration_text" />
 
                             <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:minWidth="56dp"
                                 android:text="10s"
-                                app:chipBackgroundColor="@color/chip_duration_bg" />
+                                app:chipBackgroundColor="@color/chip_duration_bg"
+                                app:chipStrokeColor="@color/chip_duration_stroke"
+                                app:chipStrokeWidth="2dp"
+                                android:textColor="@color/chip_duration_text" />
 
                             <com.google.android.material.chip.Chip
                                 android:id="@+id/chip15s"
@@ -189,7 +194,10 @@
                                 android:layout_height="wrap_content"
                                 android:minWidth="56dp"
                                 android:text="15s"
-                                app:chipBackgroundColor="@color/chip_duration_bg" />
+                                app:chipBackgroundColor="@color/chip_duration_bg"
+                                app:chipStrokeColor="@color/chip_duration_stroke"
+                                app:chipStrokeWidth="2dp"
+                                android:textColor="@color/chip_duration_text" />
 
                             <com.google.android.material.chip.Chip
                                 android:id="@+id/chip30s"
@@ -198,7 +206,10 @@
                                 android:layout_height="wrap_content"
                                 android:minWidth="56dp"
                                 android:text="30s"
-                                app:chipBackgroundColor="@color/chip_duration_bg" />
+                                app:chipBackgroundColor="@color/chip_duration_bg"
+                                app:chipStrokeColor="@color/chip_duration_stroke"
+                                app:chipStrokeWidth="2dp"
+                                android:textColor="@color/chip_duration_text" />
                         </com.google.android.material.chip.ChipGroup>
                     </HorizontalScrollView>