fade out now exponential and optional when minutes set

.idea/gradle.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>

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

@@ -1,25 +1,38 @@
 package com.example.hairdryer
 
 import android.app.Activity
+import android.graphics.Color
 import android.media.AudioAttributes
 import android.media.SoundPool
 import android.os.Bundle
 import android.os.Handler
-import android.widget.Button
 import android.widget.EditText
+import android.widget.ProgressBar
+import android.widget.TextView
+import kotlin.math.pow
+import kotlin.math.max
+
 class MainActivity : Activity() {
 
     private lateinit var soundPool: SoundPool
     private var soundId = 0
     private var streamId = 0
     private val handler = Handler()
+    private var isPlaying = false
+    private var fadeEnabled = false
+    private var totalMillis: Long = 0
+    private var startTime: Long = 0
+    private var fadeRunnable: Runnable? = null
+    private var countdownRunnable: Runnable? = null
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        val status = findViewById<TextView>(R.id.statusText)
         val input = findViewById<EditText>(R.id.timerInput)
-        val btn = findViewById<Button>(R.id.startBtn)
+        val fadeToggle = findViewById<TextView>(R.id.fadeToggle)
+        val volumeBar = findViewById<ProgressBar>(R.id.volumeBar)
 
         val attrs = AudioAttributes.Builder()
             .setUsage(AudioAttributes.USAGE_MEDIA)
@@ -33,22 +46,97 @@ class MainActivity : Activity() {
 
         soundId = soundPool.load(this, R.raw.sound, 1)
 
-        btn.setOnClickListener {
+        updateUI(status, volumeBar, "Bereit", Color.LTGRAY, 1f)
-            val min = input.text.toString().toIntOrNull() ?: 0
+        fadeToggle.setOnClickListener {
-            startLoopingSound(min)
+            fadeEnabled = !fadeEnabled
+            fadeToggle.text = "Fade-Out: " + if (fadeEnabled) "ON" else "OFF"
+        }
+
+        status.setOnClickListener {
+            if (isPlaying) {
+                stopSound(status, volumeBar)
+            } else {
+                val minutes = input.text.toString().toIntOrNull() ?: 0
+                startSound(minutes, status, volumeBar)
+            }
         }
     }
 
-    private fun startLoopingSound(minutes: Int) {
+    private fun startSound(minutes: Int, status: TextView, volumeBar: ProgressBar) {
-        // Starte Sound in Schleife
+        stopSound(status, volumeBar)
-        streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f) // -1 = loop unendlich
+        streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f)
+        isPlaying = true
+        startTime = System.currentTimeMillis()
 
         if (minutes > 0) {
-            handler.postDelayed({
+            totalMillis = minutes * 60_000L
-                soundPool.stop(streamId)
+            updateCountdown(minutes * 60, status)
-            }, minutes * 60_000L)
+            // Countdown jede Sekunde
+            countdownRunnable = object : Runnable {
+                override fun run() {
+                    val elapsedSec = ((System.currentTimeMillis() - startTime) / 1000).toInt()
+                    val remainingSec = max(minutes * 60 - elapsedSec, 0)
+                    updateCountdown(remainingSec, status)
+                    if (remainingSec > 0) {
+                        handler.postDelayed(this, 1000L)
+                    } else {
+                        stopSound(status, volumeBar)
                     }
                 }
+            }
+            handler.postDelayed(countdownRunnable!!, 1000L)
+
+            // Fade-Out (optional)
+            if (fadeEnabled) {
+                fadeRunnable = object : Runnable {
+                    override fun run() {
+                        if (!isPlaying) return
+                        val elapsed = System.currentTimeMillis() - startTime
+                        val progress = (elapsed.toFloat() / totalMillis).coerceIn(0f, 1f)
+                        val volume = (1 - progress).pow(2) // exponentielles Fade
+                        soundPool.setVolume(streamId, volume, volume)
+                        volumeBar.progress = (volume * 100).toInt()
+                        if (progress < 1f) {
+                            handler.postDelayed(this, 200L)
+                        }
+                    }
+                }
+                handler.postDelayed(fadeRunnable!!, 200L)
+            } else {
+                volumeBar.progress = 100
+            }
+        } else {
+            // unendlich
+            updateUI(status, volumeBar, "Läuft: ∞", Color.GREEN, 1f)
+            volumeBar.progress = 100
+        }
+    }
+
+    private fun updateCountdown(remainingSec: Int, status: TextView) {
+        val minutes = remainingSec / 60
+        val seconds = remainingSec % 60
+        status.text = String.format("Läuft: %02d:%02d", minutes, seconds)
+        status.setBackgroundColor(Color.GREEN)
+        status.setTextColor(Color.BLACK)
+    }
+
+    private fun stopSound(status: TextView, volumeBar: ProgressBar) {
+        if (isPlaying) {
+            soundPool.stop(streamId)
+            isPlaying = false
+        }
+        handler.removeCallbacks(countdownRunnable ?: Runnable {})
+        handler.removeCallbacks(fadeRunnable ?: Runnable {})
+        updateUI(status, volumeBar, "Gestoppt", Color.RED, 0f)
+        volumeBar.progress = 0
+    }
+
+    private fun updateUI(view: TextView, bar: ProgressBar, text: String, color: Int, volume: Float) {
+        view.text = text
+        view.setBackgroundColor(color)
+        view.setTextColor(Color.BLACK)
+        bar.progress = (volume * 100).toInt()
+    }
 
     override fun onDestroy() {
         super.onDestroy()

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

@@ -6,17 +6,55 @@
     android:orientation="vertical"
     android:padding="20dp">
 
+
+    <TextView
+        android:id="@+id/parentDeviceTitle"
+        android:gravity="center_horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="top|center_vertical"
+        android:text="Dunstabzugshaube/Hairdryer"
+        android:textSize="25dp" />
+
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="50dp" />
+    <TextView
+        android:id="@+id/statusText"
+        android:text="Bereit"
+        android:textSize="26sp"
+        android:gravity="center"
+        android:textColor="#000000"
+        android:padding="24dp"
+        android:background="#CCCCCC"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
     <EditText
         android:id="@+id/timerInput"
         android:hint="Sleep Timer (Minuten)"
         android:inputType="number"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"/>
+        android:layout_height="wrap_content"
+        android:layout_marginTop="20dp"/>
 
-    <Button
+    <TextView
-        android:id="@+id/startBtn"
+        android:id="@+id/fadeToggle"
-        android:text="Start"
+        android:text="Fade-Out: OFF"
+        android:gravity="center"
+        android:padding="12dp"
+        android:layout_marginTop="20dp"
+        android:background="#AAAAAA"
+        android:textColor="#000000"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
 
+    <ProgressBar
+        android:id="@+id/volumeBar"
+        style="@android:style/Widget.ProgressBar.Horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="24dp"
+        android:layout_marginTop="20dp"
+        android:max="100"
+        android:progress="100"/>
 </LinearLayout>