Some optimizations for view inflation.

    @Override

    public void setAlpha(int alpha) {

        if (mPaint == null && alpha == 0xFF) {

            // Fast common case -- leave at normal alpha.

            return;

        }

        getPaint().setAlpha(alpha);

        invalidateSelf();

    }

    @Override

    public void setColorFilter(ColorFilter cf) {

        if (mPaint == null && cf == null) {

            // Fast common case -- leave at no color filter.

            return;

        }

        getPaint().setColorFilter(cf);

        invalidateSelf();

    }

    @Override

    public void setDither(boolean dither) {

        if (mPaint == null && dither == DEFAULT_DITHER) {

            // Fast common case -- leave at default dither.

            return;

        }

        getPaint().setDither(dither);

        invalidateSelf();

    }