Coloring.java 文件源码

/**
 * Creates a new {@link RippleDrawable} introduced in Lollipop.
 *
 * @param normalColor  Color for the idle/normal state
 * @param rippleColor  Color for the ripple effect
 * @param bounds       Clipping bounds for the ripple state. Set to {@code null} to get a borderless ripple
 * @param cornerRadius Set to round the corners on rectangular drawables, 0 to disable
 * @return A fully colored RippleDrawable, new instance each time
 */
@NonNull
@RequiresApi(Build.VERSION_CODES.LOLLIPOP)
public static RippleDrawable createRippleDrawable(@ColorInt final int normalColor, @ColorInt final int rippleColor, @Nullable final Rect bounds,
                                                  @IntRange(from = 0) final int cornerRadius) {
    Drawable maskDrawable = null;
    if (bounds != null) {
        // clip color is white
        maskDrawable = createColoredDrawable(Color.WHITE, bounds);
        if (maskDrawable instanceof GradientDrawable) {
            ((GradientDrawable) maskDrawable).setCornerRadius(cornerRadius);
        }
        maskDrawable.setBounds(bounds);
    }

    Drawable normalStateDrawable = null;
    // transparent has no idle state
    if (normalColor != Color.TRANSPARENT) {
        normalStateDrawable = createColoredDrawable(normalColor, bounds);
        if (normalStateDrawable instanceof GradientDrawable) {
            ((GradientDrawable) normalStateDrawable).setCornerRadius(cornerRadius);
        }
    }

    return new RippleDrawable(ColorStateList.valueOf(rippleColor), normalStateDrawable, maskDrawable);
}