Made node recycling approach a bit more surgical to appease older versions of Android, and adjusted anchor position offset for older versions of Android (#711)

src/Android/Accessibility/AccessibilityHelpers.cs

@@ -253,6 +253,7 @@ namespace Bit.Droid.Accessibility
             if(dispose)
             {
                 n?.Recycle();
+                n?.Dispose();
             }
             return nodes;
         }
@@ -291,7 +292,6 @@ namespace Bit.Droid.Accessibility
             if(usernameEditText != null)
             {
                 isUsernameEditText = IsSameNode(usernameEditText, e.Source);
-                usernameEditText.Recycle();
             }
             allEditTexts.Dispose();
 
@@ -370,7 +370,12 @@ namespace Bit.Droid.Accessibility
             var anchorViewRectTop = anchorViewRect.Top;
             anchorViewRect.Dispose();
 
-            var calculatedTop = rootRectHeight - anchorViewRectTop - GetNavigationBarHeight();
+            int calculatedTop = rootRectHeight - anchorViewRectTop;
+            if((int)Build.VERSION.SdkInt >= 24)
+            {
+                calculatedTop -= GetNavigationBarHeight();
+            }
+
             return new Point(anchorViewRectLeft, calculatedTop);
         }
 
@@ -385,6 +390,10 @@ namespace Bit.Droid.Accessibility
                 {
                     return new Point(-1, -1);
                 }
+                if(!anchorNode.Focused)
+                {
+                    return null;
+                }
 
                 // node.VisibleToUser doesn't always give us exactly what we want, so attempt to tighten up the range
                 // of visibility

src/Android/Accessibility/AccessibilityService.cs

@@ -75,32 +75,27 @@ namespace Bit.Droid.Accessibility
                         if(e.Source == null || e.PackageName == BitwardenPackage)
                         {
                             CancelOverlayPrompt();
-                            e.Recycle();
                             break;
                         }
 
                         root = RootInActiveWindow;
                         if(root == null || root.PackageName != e.PackageName)
                         {
-                            e.Recycle();
                             break;
                         }
                         var isKnownBroswer = AccessibilityHelpers.SupportedBrowsers.ContainsKey(root.PackageName);
                         if(e.EventType == EventTypes.ViewClicked && isKnownBroswer)
                         {
-                            e.Recycle();
                             break;
                         }
                         if(!(e.Source?.Password ?? false) && !AccessibilityHelpers.IsUsernameEditText(root, e))
                         {
                             CancelOverlayPrompt();
-                            e.Recycle();
                             break;
                         }
                         if(ScanAndAutofill(root, e))
                         {
                             CancelOverlayPrompt();
-                            e.Recycle();
                         }
                         else
                         {
@@ -111,36 +106,27 @@ namespace Bit.Droid.Accessibility
                     case EventTypes.WindowStateChanged:
                         if(AccessibilityHelpers.LastCredentials == null)
                         {
-                            e.Recycle();
                             break;
                         }
                         if(e.PackageName == BitwardenPackage)
                         {
                             CancelOverlayPrompt();
-                            e.Recycle();
                             break;
                         }
 
                         root = RootInActiveWindow;
                         if(root == null || root.PackageName != e.PackageName)
                         {
-                            e.Recycle();
                             break;
                         }
                         if(ScanAndAutofill(root, e))
                         {
                             CancelOverlayPrompt();
                         }
-                        e.Recycle();
                         break;
                     default:
                         break;
                 }
-
-                if(root != null)
-                {
-                    root.Recycle();
-                }
             }
             // Suppress exceptions so that service doesn't crash.
             catch(Exception ex)
@@ -211,7 +197,6 @@ namespace Bit.Droid.Accessibility
             {
                 System.Diagnostics.Debug.WriteLine(">>> Overlay Permission not granted");
                 Toast.MakeText(this, AppResources.AccessibilityOverlayPermissionAlert, ToastLength.Long).Show();
-                e.Recycle();
                 return;
             }
 
@@ -222,14 +207,12 @@ namespace Bit.Droid.Accessibility
 
             if(Java.Lang.JavaSystem.CurrentTimeMillis() - _lastAutoFillTime < 1000)
             {
-                e.Recycle();
                 return;
             }
 
             var uri = AccessibilityHelpers.GetUri(root);
             if(string.IsNullOrWhiteSpace(uri))
             {
-                e.Recycle();
                 return;
             }
 
@@ -301,7 +284,6 @@ namespace Bit.Droid.Accessibility
                 windows = Windows;
             }
             var anchorPosition = AccessibilityHelpers.GetOverlayAnchorPosition(_anchorNode, root, windows);
-            root.Recycle();
 
             if(anchorPosition == null)
             {

src/Android/Accessibility/NodeList.cs

@@ -10,8 +10,9 @@ namespace Bit.Droid.Accessibility
         {
             foreach(var item in this)
             {
+                item.Recycle();
                 item.Dispose();
             }
         }
     }
-}
+}