(WIP) Scribe hover icon

shell/platform/android/io/flutter/embedding/android/FlutterView.java

@@ -24,6 +24,7 @@
 import android.util.SparseArray;
 import android.view.Display;
 import android.view.DisplayCutout;
+import android.view.InputDevice;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.PointerIcon;
@@ -846,6 +847,20 @@ public InputConnection onCreateInputConnection(@NonNull EditorInfo outAttrs) {
     return textInputPlugin.createInputConnection(this, keyboardManager, outAttrs);
   }
 
+  @Override
+  public PointerIcon onResolvePointerIcon(MotionEvent event, int pointerIndex) {
+    // TODO(justinmc): Also need to check if over a valid field and if stylus
+    // input is supported.
+    // Maybe have to do this in the framework and show a Flutter icon?
+    final int toolType = event.getToolType(pointerIndex);
+    if (!event.isFromSource(InputDevice.SOURCE_MOUSE)
+        && event.isFromSource(InputDevice.SOURCE_STYLUS)
+        && toolType == MotionEvent.TOOL_TYPE_STYLUS) {
+      return PointerIcon.getSystemIcon(getContext(), PointerIcon.TYPE_HANDWRITING);
+    }
+    return super.onResolvePointerIcon(event, pointerIndex);
+  }
+
   /**
    * Allows a {@code View} that is not currently the input connection target to invoke commands on
    * the {@link android.view.inputmethod.InputMethodManager}, which is otherwise disallowed.