docs: public void showHint() {
      final int[] screenPos = new int[2];
      final Rect displayFrame = new Rect();
      getLocationOnScreen(screenPos);
      getWindowVisibleDisplayFrame(displayFrame);
      final Context context = getContext();
      final int width = getWidth();
      final int height = getHeight();
      final int midy = screenPos[1] + height / 2;
      int referenceX = screenPos[0] + width / 2;
      if (ViewCompat.getLayoutDirection(this) == ViewCompat.LAYOUT_DIRECTION_LTR) {
        final int screenWidth = context.getResources().getDisplayMetrics().widthPixels;
        referenceX = screenWidth - referenceX; // mirror
      }
      StringBuilder hint = new StringBuilder("#");
      if (Color.alpha(color) != 255) {
        hint.append(Integer.toHexString(color).toUpperCase(Locale.ENGLISH));
      } else {
        hint.append(String.format("%06X", 0xFFFFFF & color).toUpperCase(Locale.ENGLISH));
      }
      Toast cheatSheet = Toast.makeText(context, hint.toString(), Toast.LENGTH_SHORT);
      if (midy < displayFrame.height()) {
        // Show along the top; follow action buttons
        cheatSheet.setGravity(Gravity.TOP | GravityCompat.END, referenceX, screenPos[1] + height - displayFrame.top);
      } else {
        // Show along the bottom center
        cheatSheet.setGravity(Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, height);
      }
      cheatSheet.show();
    }