Android 12 (API 31) deprecation error fix when building appbundle (#662)

* BluetoothAdapter deprecation fix

* Updated the CHANGELOG.md and the pubspec.yaml

* Changes to the build.gradle

* Update permission_handler/android/src/main/java/com/baseflow/permissionhandler/ServiceManager.java

Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

* Added the documentation for public members

Co-authored-by: floris smit <florissmit@floriss-Air.localdomain>
Co-authored-by: Maurits van Beusekom <maurits@vnbskm.nl>

permission_handler/CHANGELOG.md

+## 8.1.5
+* Android: Fixed deprecation warnings/errors when `compileSdkVersion` was set to 31 (Android S/12).
+
 ## 8.1.4+2
 
 * iOS: fixed memory error that occurred on iOS 12.2 and below (see issue [#638](https://github.com/Baseflow/flutter-permission-handler/issues/638)).

permission_handler/android/src/main/java/com/baseflow/permissionhandler/ServiceManager.java

 package com.baseflow.permissionhandler;
 
+import static android.content.Context.BLUETOOTH_SERVICE;
+
 import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothManager;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ -45,7 +48,7 @@ final class ServiceManager {
             return;
         }
         if(permission == PermissionConstants.PERMISSION_GROUP_BLUETOOTH){
-            final int serviceStatus = isBluetoothServiceEnabled()
+            final int serviceStatus = isBluetoothServiceEnabled(context)
                     ? PermissionConstants.SERVICE_STATUS_ENABLED
                     : PermissionConstants.SERVICE_STATUS_DISABLED;
 
@@ -147,9 +150,16 @@ final class ServiceManager {
                 Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
         return !TextUtils.isEmpty(locationProviders);
     }
-
-    private boolean isBluetoothServiceEnabled() {
-        final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
-        return bluetoothAdapter.isEnabled();
+    // Suppress deprecation warnings since its purpose is to support to be backwards compatible with
+    // pre S versions of Android
+    @SuppressWarnings("deprecation")
+    private boolean isBluetoothServiceEnabled(Context context) {
+        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.JELLY_BEAN_MR2) {
+            return BluetoothAdapter.getDefaultAdapter().isEnabled();
+        } 
+        
+        BluetoothManager manager = (BluetoothManager) context.getSystemService(BLUETOOTH_SERVICE);
+        final BluetoothAdapter adapter = manager.getAdapter();
+        return adapter.isEnabled();
     }
 }

permission_handler/example/lib/main.dart

@@ -18,6 +18,7 @@ final MaterialColor themeMaterialColor =
 
 /// A Flutter application demonstrating the functionality of this plugin
 class PermissionHandlerWidget extends StatefulWidget {
+  /// Create a page containing the functionality of this plugin
   static ExamplePage createPage() {
     return ExamplePage(
         Icons.location_on, (context) => PermissionHandlerWidget());
@@ -62,8 +63,9 @@ class _PermissionHandlerWidgetState extends State<PermissionHandlerWidget> {
   }
 }
 
+/// Permission widget containing information about the passed [Permission]
 class PermissionWidget extends StatefulWidget {
-  /// Constructs a [PermissionWidget] for the supplied [Permission].
+  /// Constructs a [PermissionWidget] for the supplied [Permission]
   const PermissionWidget(this._permission);
 
   final Permission _permission;

permission_handler/pubspec.yaml

 name: permission_handler
 description: Permission plugin for Flutter. This plugin provides a cross-platform (iOS, Android) API to request and check permissions.
-version: 8.1.4+2
+version: 8.1.5
 homepage: https://github.com/baseflowit/flutter-permission-handler
 
 flutter: