added stop button and info to put in minutes

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

@@ -7,6 +7,7 @@ import android.os.Bundle
 import android.os.Handler
 import android.widget.Button
 import android.widget.EditText
+
 class MainActivity : Activity() {
 
     private lateinit var soundPool: SoundPool
@@ -19,7 +20,8 @@ class MainActivity : Activity() {
         setContentView(R.layout.activity_main)
 
         val input = findViewById<EditText>(R.id.timerInput)
-        val btn = findViewById<Button>(R.id.startBtn)
+        val btnStart = findViewById<Button>(R.id.startBtn)
+        val btnStop = findViewById<Button>(R.id.stopBtn)
 
         val attrs = AudioAttributes.Builder()
             .setUsage(AudioAttributes.USAGE_MEDIA)
@@ -33,20 +35,29 @@ class MainActivity : Activity() {
 
         soundId = soundPool.load(this, R.raw.sound, 1)
 
-        btn.setOnClickListener {
+        btnStart.setOnClickListener {
             val min = input.text.toString().toIntOrNull() ?: 0
             startLoopingSound(min)
         }
+
+        btnStop.setOnClickListener {
+            stopSound()
+        }
     }
 
     private fun startLoopingSound(minutes: Int) {
-        // Starte Sound in Schleife
+        stopSound() // sicherstellen, dass kein alter Loop läuft
         streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f) // -1 = loop unendlich
 
         if (minutes > 0) {
-            handler.postDelayed({
+            handler.postDelayed({ stopSound() }, minutes * 60_000L)
+        }
+    }
+
+    private fun stopSound() {
+        if (streamId != 0) {
             soundPool.stop(streamId)
-            }, minutes * 60_000L)
+            streamId = 0
         }
     }
 

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

@@ -6,12 +6,26 @@
     android:orientation="vertical"
     android:padding="20dp">
 
+    <TextView
+        android:id="@+id/childDescription"
+        android:gravity="center"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="Timer in Minutes:"
+        android:textSize="14sp" />
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="15dip" />
+
     <EditText
         android:id="@+id/timerInput"
-        android:hint="Sleep Timer (Minuten)"
+        android:hint="empty means endless"
         android:inputType="number"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="30dip" />
 
     <Button
         android:id="@+id/startBtn"
@@ -19,4 +33,14 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"/>
 
+    <Space
+        android:layout_width="match_parent"
+        android:layout_height="5dip" />
+
+    <Button
+        android:id="@+id/stopBtn"
+        android:text="Stop"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
 </LinearLayout>