Method setAlpha

shared/java/Paint.java:288–291

Replaces alpha, leaving RGB unchanged. An out of range value triggers an assert in the debug build. a is a value from 0 to 255. a set to zero makes color fully transparent; a set to 255 makes color fully opaque. @param a alpha component of color @return this

(int a)

     * @return   this
     */
    @NotNull @Contract("_ -> this")
    public Paint setAlpha(int a) {
        return setAlphaf(a / 255f);
    }

    /**
     * Sets color used when drawing solid fills. The color components range from 0 to 255.