Merge pull request #1571 from unoplatform/dev/jela/recycler-touch

[Android] Fix java NRE handing touch events on detached view

doc/ReleaseNotes/_ReleaseNotes.md

@@ -120,6 +120,7 @@
 * [iOS(iPad)] `ComboBox` : the combobox wasn't fully expanding vertically on first opening.
 * `Popup` & `ComboBox` (and other controls using `Popup`) were not behaving properly when `IsLightDismissable` were set to `true`.
 * [Wasm] Fix unloaded UIElements are made visible if measured and arranged
+* [Android] Fix java NRE handing touch events on detached view
 
 ## Release 1.45.0
 ### Features

src/Uno.UI.BindingHelper.Android/Uno/UI/UnoViewGroup.java

@@ -951,14 +951,19 @@ private static float[] getTransformedTouchCoordinate(ViewParent view, MotionEven
 			return point;
 		}
 
-		// Non-UIElement view, walk the tree up to the next UIElement
-		// (and adjust coordinate for each layer to include its location, i.e. Top, Left, etc.)
-		final ViewParent parent = view.getParent();
-		if (parent instanceof View) {
-			// Not at root, walk upward
-			float[] coords = getTransformedTouchCoordinate(parent, e);
-			calculateTransformedPoint((View) view, coords);
-			return coords;
+		if(view != null) {
+			// The parent view may be null if the touched item is being removed
+			// from the tree while being touched.
+
+			// Non-UIElement view, walk the tree up to the next UIElement
+			// (and adjust coordinate for each layer to include its location, i.e. Top, Left, etc.)
+			final ViewParent parent = view.getParent();
+			if (parent instanceof View) {
+				// Not at root, walk upward
+				float[] coords = getTransformedTouchCoordinate(parent, e);
+				calculateTransformedPoint((View) view, coords);
+				return coords;
+			}
 		}
 
 		// We reached the top of the tree