initial works with ugly design

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

@@ -0,0 +1,57 @@
+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()
+    }
+}