initial works with ugly design

app/src/androidTest/java/com/example/hairdryer/ExampleInstrumentedTest.kt

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+package com.example.hairdryer
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.example.hairdryer", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.hairdryer">
+
+    <application
+        android:label="Hairdryer/Dunstabzugshaube"
+        android:allowBackup="true"
+        android:supportsRtl="true"
+        android:theme="@android:style/Theme.Light.NoTitleBar">
+
+
+        <activity android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+
+    </application>
+</manifest>

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

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+package com.example.hairdryer
+
+import android.app.Activity
+import android.media.AudioAttributes
+import android.media.SoundPool
+import android.os.Bundle
+import android.os.Handler
+import android.widget.Button
+import android.widget.EditText
+class MainActivity : Activity() {
+
+    private lateinit var soundPool: SoundPool
+    private var soundId = 0
+    private var streamId = 0
+    private val handler = Handler()
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val input = findViewById<EditText>(R.id.timerInput)
+        val btn = findViewById<Button>(R.id.startBtn)
+
+        val attrs = AudioAttributes.Builder()
+            .setUsage(AudioAttributes.USAGE_MEDIA)
+            .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+            .build()
+
+        soundPool = SoundPool.Builder()
+            .setMaxStreams(1)
+            .setAudioAttributes(attrs)
+            .build()
+
+        soundId = soundPool.load(this, R.raw.sound, 1)
+
+        btn.setOnClickListener {
+            val min = input.text.toString().toIntOrNull() ?: 0
+            startLoopingSound(min)
+        }
+    }
+
+    private fun startLoopingSound(minutes: Int) {
+        // Starte Sound in Schleife
+        streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f) // -1 = loop unendlich
+
+        if (minutes > 0) {
+            handler.postDelayed({
+                soundPool.stop(streamId)
+            }, minutes * 60_000L)
+        }
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        soundPool.release()
+    }
+}

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

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+<?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="match_parent"
+    android:gravity="center"
+    android:orientation="vertical"
+    android:padding="20dp">
+
+    <EditText
+        android:id="@+id/timerInput"
+        android:hint="Sleep Timer (Minuten)"
+        android:inputType="number"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
+    <Button
+        android:id="@+id/startBtn"
+        android:text="Start"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
+</LinearLayout>

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

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+<resources xmlns:tools="http://schemas.android.com/tools">
+    <style name="Theme.AppCompat.Light.NoActionBar" parent="Theme.AppCompat.Light.NoActionBar" />
+</resources>

app/src/test/java/com/example/hairdryer/ExampleUnitTest.kt

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+package com.example.hairdryer
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}