Modified onAccessibilityEvent method to reset highlight bounds to "parent" window at TYPE_WINDOW_STATE_CHANGED.
Modified touch event to get and highlight parent node on touching top left quadrant.
Modified code to show the relationship of root, parent, and scan node.
Modified code to get and highlight child node on touching top right quadrant.
Modified code to get and highlight the preceding sibling on touching bottom left quadrant.
Modified code to get and highlight the succeeding sibling on touching bottom right quadrant.