added colors

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

@@ -1,6 +1,7 @@
 package com.example.hairdryer
 
 import android.app.Activity
+import android.graphics.Color
 import android.media.AudioAttributes
 import android.media.SoundPool
 import android.os.Bundle
@@ -39,6 +40,12 @@ class MainActivity : Activity() {
 
         soundId = soundPool.load(this, R.raw.sound, 1)
 
+        // Initial: Start-Zustand (grün)
+        btn.setBackgroundColor(Color.GREEN)
+        btn.setTextColor(Color.BLACK)
+        status.setBackgroundColor(Color.LTGRAY)
+        status.setTextColor(Color.BLACK)
+
         btn.setOnClickListener {
             if (isPlaying) {
                 stopSound(btn, status)
@@ -51,18 +58,22 @@ class MainActivity : Activity() {
 
     private fun startSound(minutes: Int, btn: Button, status: TextView) {
         stopSound(btn, status) // sicherstellen, dass nichts doppelt läuft
-        streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f)  // -1 = loop unendlich
+        streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f)
         isPlaying = true
         btn.text = "Stop"
+        btn.setBackgroundColor(Color.RED)
+        btn.setTextColor(Color.BLACK)
+
+        status.setBackgroundColor(Color.GREEN)
+        status.text = if (minutes > 0) "Läuft: ${minutes} min" else "Läuft: ∞"
 
         if (minutes > 0) {
             remainingMinutes = minutes
-            updateStatus(status)
             countdownRunnable = object : Runnable {
                 override fun run() {
                     remainingMinutes--
                     if (remainingMinutes > 0) {
-                        updateStatus(status)
+                        status.text = "Läuft: ${remainingMinutes} min"
                         handler.postDelayed(this, 60_000L)
                     } else {
                         stopSound(btn, status)
@@ -70,8 +81,6 @@ class MainActivity : Activity() {
                 }
             }
             handler.postDelayed(countdownRunnable!!, 60_000L)
-        } else {
-            status.text = "Läuft: ∞"
         }
     }
 
@@ -79,15 +88,16 @@ class MainActivity : Activity() {
         if (isPlaying) {
             soundPool.stop(streamId)
             isPlaying = false
+        }
         remainingMinutes = 0
         handler.removeCallbacks(countdownRunnable ?: Runnable { })
         status.text = "Gestoppt"
-            btn.text = "Start"
+        status.setBackgroundColor(Color.RED)
-        }
+        status.setTextColor(Color.BLACK)
-    }
 
-    private fun updateStatus(status: TextView) {
+        btn.text = "Start"
-        status.text = "Läuft: ${remainingMinutes} min"
+        btn.setBackgroundColor(Color.GREEN)
+        btn.setTextColor(Color.BLACK)
     }
 
     override fun onDestroy() {

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

@@ -5,6 +5,7 @@
     android:orientation="vertical"
     android:padding="20dp">
 
+
     <TextView
         android:id="@+id/parentDeviceTitle"
         android:gravity="center_horizontal"
@@ -17,11 +18,21 @@
     <Space
         android:layout_width="match_parent"
         android:layout_height="50dp" />
+    <View
+        android:id="@+id/statusCircle"
+        android:layout_width="80dp"
+        android:layout_height="80dp"
+        android:layout_gravity="center"
+        android:background="@drawable/circle_gray" />
+
     <TextView
         android:id="@+id/statusText"
         android:gravity="center_horizontal"
         android:text="Bereit"
         android:textSize="24sp"
+        android:textColor="#000000"
+        android:padding="12dp"
+        android:background="#CCCCCC"
         android:layout_marginBottom="20dp"
         android:layout_width="match_parent"
         android:layout_height="wrap_content" />
@@ -50,7 +61,12 @@
     <Button
         android:id="@+id/mainBtn"
         android:text="Start"
+        android:textColor="#000000"
+        android:background="#00FF00"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="10dp"/>
+        android:layout_marginTop="10dp"
+        android:textSize="34sp"
+        />
+
 </LinearLayout>