diff --git a/android/app/src/main/java/nl/eddydevink/sylda/MainActivity.kt b/android/app/src/main/java/nl/eddydevink/sylda/MainActivity.kt
index e18839c..8f73a52 100644
--- a/android/app/src/main/java/nl/eddydevink/sylda/MainActivity.kt
+++ b/android/app/src/main/java/nl/eddydevink/sylda/MainActivity.kt
@@ -2,6 +2,7 @@
 package nl.eddydevink.sylda
 
 import android.content.Intent
+import android.content.pm.PackageManager
 import android.graphics.Color
 import android.net.Uri
 import android.os.Bundle
@@ -12,13 +13,14 @@ import android.widget.Button
 import android.widget.ImageButton
 import android.widget.TextView
 import android.widget.Toast
-import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 
 class MainActivity : AppCompatActivity(), BleCallbacks {
 
     companion object {
+        private const val REQUEST_SETTINGS = 1
         private const val POST_SETTINGS_RESCAN_MS = 500L
         private const val ON_RESUME_SCAN_DELAY_MS = 300L
     }
@@ -32,25 +34,6 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
     private var lastTheme: String? = null
     private var triedPermissions = false
 
-    private val settingsLauncher = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
-        if (result.resultCode == SettingsActivity.RESULT_SCAN) {
-            triedPermissions = false
-            manager.disconnect()
-            manager.resetTriedAddresses()
-            manager.updateKeys()
-            handler.postDelayed({ manager.startScan() }, POST_SETTINGS_RESCAN_MS)
-        }
-    }
-
-    private val permissionLauncher = registerForActivityResult(ActivityResultContracts.RequestMultiplePermissions()) { grants ->
-        if (grants.values.all { it }) {
-            manager.startScan()
-        } else {
-            triedPermissions = false
-            onStatusChanged(BleStatus.PermissionsDenied)
-        }
-    }
-
     override fun onStatusChanged(status: BleStatus) {
         when (status) {
             BleStatus.Connected -> {
@@ -116,10 +99,10 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
         val settingsContainer = findViewById<android.view.View>(R.id.settingsContainer)
 
         settingsContainer.setOnClickListener {
-            settingsLauncher.launch(Intent(this, SettingsActivity::class.java))
+            startActivityForResult(Intent(this, SettingsActivity::class.java), REQUEST_SETTINGS)
         }
         findViewById<ImageButton>(R.id.settingsButton).setOnClickListener {
-            settingsLauncher.launch(Intent(this, SettingsActivity::class.java))
+            startActivityForResult(Intent(this, SettingsActivity::class.java), REQUEST_SETTINGS)
         }
         setupRelayButton()
         setupRelay2Button()
@@ -127,6 +110,18 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
         relay2Button.isEnabled = true
     }
 
+    @Deprecated("Deprecated in Java")
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        super.onActivityResult(requestCode, resultCode, data)
+        if (requestCode == REQUEST_SETTINGS && resultCode == SettingsActivity.RESULT_SCAN) {
+            triedPermissions = false
+            manager.disconnect()
+            manager.resetTriedAddresses()
+            manager.updateKeys()
+            handler.postDelayed({ manager.startScan() }, POST_SETTINGS_RESCAN_MS)
+        }
+    }
+
     override fun onResume() {
         super.onResume()
         val current = PrefsHelper.getPrefs(this).getString(PrefsHelper.PREF_THEME, "system") ?: "system"
@@ -140,7 +135,7 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
         if (!manager.hasPermissions()) {
             if (!triedPermissions) {
                 triedPermissions = true
-                permissionLauncher.launch(manager.getRequiredPermissions())
+                ActivityCompat.requestPermissions(this, manager.getRequiredPermissions(), 1)
             }
             return
         }
@@ -155,6 +150,19 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
         manager.stopScan()
     }
 
+    @Deprecated("Deprecated in Java")
+    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
+        if (requestCode == 1) {
+            if (grantResults.all { it == PackageManager.PERMISSION_GRANTED }) {
+                manager.startScan()
+            } else {
+                triedPermissions = false
+                onStatusChanged(BleStatus.PermissionsDenied)
+            }
+        }
+    }
+
     private fun setupRelayButton() {
         relay1Button.setOnClickListener(null)
         loadButtonLabel(relay1Button, PrefsHelper.PREF_LABEL1, R.string.button_hold)
@@ -222,7 +230,7 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
             if (isFinishing || isDestroyed || !lifecycle.currentState.isAtLeast(androidx.lifecycle.Lifecycle.State.RESUMED)) return@runOnUiThread
             if (espVersion.isNotEmpty() && espVersion != appVersion) {
                 Toast.makeText(this, getString(R.string.ota_update_available), Toast.LENGTH_SHORT).show()
-                settingsLauncher.launch(Intent(this, SettingsActivity::class.java))
+                startActivityForResult(Intent(this, SettingsActivity::class.java), REQUEST_SETTINGS)
             }
         }
     }