From 1b7e3699a73b823e4818da6a88d06bf6d054f0a0 Mon Sep 17 00:00:00 2001
From: blackspherefollower <darktech@black-sphere.co.uk>
Date: Wed, 2 Oct 2024 15:25:37 +0100
Subject: [PATCH] fix: Correct an Android bug where stopping a scan when
 there's no longer a Bluetooth adapter/scanner can cause an NPE

---
 .../com/nonpolynomial/btleplug/android/impl/Adapter.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/droidplug/java/src/main/java/com/nonpolynomial/btleplug/android/impl/Adapter.java b/src/droidplug/java/src/main/java/com/nonpolynomial/btleplug/android/impl/Adapter.java
index 9f04d180..e2a4332b 100644
--- a/src/droidplug/java/src/main/java/com/nonpolynomial/btleplug/android/impl/Adapter.java
+++ b/src/droidplug/java/src/main/java/com/nonpolynomial/btleplug/android/impl/Adapter.java
@@ -47,7 +47,13 @@ public void startScan(ScanFilter filter) {
 
     @SuppressLint("MissingPermission")
     public void stopScan() {
-        BluetoothAdapter.getAdapter().getBluetoothLeScanner().stopScan(this.callback);
+        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+        if (bluetoothAdapter != null) {
+            BluetoothLeScanner scanner = bluetoothAdapter.getBluetoothLeScanner();
+            if (scanner != null) {
+                scanner.stopScan(this.callback);
+            }
+        }
     }
 
     private native void reportScanResult(ScanResult result);