changed to start/stopp

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
+import android.widget.TextView
 
 class MainActivity : Activity() {
 
@@ -14,14 +15,17 @@ class MainActivity : Activity() {
     private var soundId = 0
     private var streamId = 0
     private val handler = Handler()
+    private var isPlaying = false
+    private var remainingMinutes = 0
+    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 btnStart = findViewById<Button>(R.id.startBtn)
+        val btn = findViewById<Button>(R.id.mainBtn)
-        val btnStop = findViewById<Button>(R.id.stopBtn)
 
         val attrs = AudioAttributes.Builder()
             .setUsage(AudioAttributes.USAGE_MEDIA)
@@ -35,32 +39,57 @@ class MainActivity : Activity() {
 
         soundId = soundPool.load(this, R.raw.sound, 1)
 
-        btnStart.setOnClickListener {
+        btn.setOnClickListener {
+            if (isPlaying) {
+                stopSound(btn, status)
+            } else {
                 val min = input.text.toString().toIntOrNull() ?: 0
-            startLoopingSound(min)
+                startSound(min, btn, status)
             }
-
-        btnStop.setOnClickListener {
-            stopSound()
         }
     }
 
-    private fun startLoopingSound(minutes: Int) {
+    private fun startSound(minutes: Int, btn: Button, status: TextView) {
-        stopSound() // sicherstellen, dass kein alter Loop läuft
+        stopSound(btn, status) // sicherstellen, dass nichts doppelt läuft
         streamId = soundPool.play(soundId, 1f, 1f, 1, -1, 1f)  // -1 = loop unendlich
+        isPlaying = true
+        btn.text = "Stop"
 
         if (minutes > 0) {
-            handler.postDelayed({ stopSound() }, minutes * 60_000L)
+            remainingMinutes = minutes
+            updateStatus(status)
+            countdownRunnable = object : Runnable {
+                override fun run() {
+                    remainingMinutes--
+                    if (remainingMinutes > 0) {
+                        updateStatus(status)
+                        handler.postDelayed(this, 60_000L)
+                    } else {
+                        stopSound(btn, status)
+                    }
+                }
+            }
+            handler.postDelayed(countdownRunnable!!, 60_000L)
+        } else {
+            status.text = "Läuft: ∞"
         }
     }
 
-    private fun stopSound() {
+    private fun stopSound(btn: Button, status: TextView) {
-        if (streamId != 0) {
+        if (isPlaying) {
             soundPool.stop(streamId)
-            streamId = 0
+            isPlaying = false
+            remainingMinutes = 0
+            handler.removeCallbacks(countdownRunnable ?: Runnable { })
+            status.text = "Gestoppt"
+            btn.text = "Start"
         }
     }
 
+    private fun updateStatus(status: TextView) {
+        status.text = "Läuft: ${remainingMinutes} min"
+    }
+
     override fun onDestroy() {
         super.onDestroy()
         soundPool.release()

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

@@ -2,12 +2,32 @@
 <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">
 
     <TextView
-        android:id="@+id/childDescription"
+        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:gravity="center_horizontal"
+        android:text="Bereit"
+        android:textSize="24sp"
+        android:layout_marginBottom="20dp"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
+    <TextView
+        android:id="@+id/Info"
         android:gravity="center"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
@@ -28,19 +48,9 @@
         android:layout_height="30dip" />
 
     <Button
-        android:id="@+id/startBtn"
+        android:id="@+id/mainBtn"
         android:text="Start"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"/>
+        android:layout_height="wrap_content"
-
+        android:layout_marginTop="10dp"/>
-    <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>