BubbleDrawableBuilder.java 文件源码

public Drawable create(Context context) {
  final GradientDrawable bubble = new GradientDrawable();
  final int              radius = context.getResources().getDimensionPixelSize(R.dimen.message_bubble_corner_radius);
  final float[]          radii  = cornerBooleansToRadii(corners, radius);

  bubble.setColor(color);
  bubble.setCornerRadii(radii);

  if (!hasShadow) {
    return bubble;
  } else {
    final GradientDrawable shadow   = new GradientDrawable();
    final int              distance = context.getResources().getDimensionPixelSize(R.dimen.message_bubble_shadow_distance);

    shadow.setColor(shadowColor);
    shadow.setCornerRadii(radii);

    final LayerDrawable layers = new LayerDrawable(new Drawable[]{shadow, bubble});
    layers.setLayerInset(1, 0, 0, 0, distance);
    return layers;
  }
}