android.support.v4.view.ViewCompat#MEASURED_SIZE_MASK源码实例Demo

private void dimChildView(View v, float mag, int fadeColor) {
    LayoutParams lp = (LayoutParams) v.getLayoutParams();
    if (mag > 0.0f && fadeColor != 0) {
        int color = (((int) (((float) ((-16777216 & fadeColor) >>> 24)) * mag)) << 24) | (ViewCompat.MEASURED_SIZE_MASK & fadeColor);
        if (lp.dimPaint == null) {
            lp.dimPaint = new Paint();
        }
        lp.dimPaint.setColorFilter(new PorterDuffColorFilter(color, Mode.SRC_OVER));
        if (ViewCompat.getLayerType(v) != 2) {
            ViewCompat.setLayerType(v, 2, lp.dimPaint);
        }
        invalidateChildRegion(v);
    } else if (ViewCompat.getLayerType(v) != 0) {
        if (lp.dimPaint != null) {
            lp.dimPaint.setColorFilter(null);
        }
        DisableLayerRunnable dlr = new DisableLayerRunnable(v);
        this.mPostedRunnables.add(dlr);
        ViewCompat.postOnAnimation(this, dlr);
    }
}
 

public static int mixColors(int fromColor, int toColor, float toAlpha) {
    float[] fromCmyk = cmykFromRgb(fromColor);
    float[] toCmyk = cmykFromRgb(toColor);
    float[] result = new float[4];
    for (int i = 0; i < 4; i++) {
        result[i] = Math.min(1.0f, (fromCmyk[i] * (1.0f - toAlpha)) + (toCmyk[i] * toAlpha));
    }
    return -16777216 + (ViewCompat.MEASURED_SIZE_MASK & rgbFromCmyk(result));
}
 

@ColorInt
public static int setAlphaComponent(@ColorInt int color, @IntRange(from = 0, to = 255) int alpha) {
    if (alpha >= 0 && alpha <= 255) {
        return (ViewCompat.MEASURED_SIZE_MASK & color) | (alpha << 24);
    }
    throw new IllegalArgumentException("alpha must be between 0 and 255.");
}
 

public static int getColorWithAlpha(float alpha, int baseColor) {
    return (Math.min(255, Math.max(0, (int) (255.0f * alpha))) << 24) + (ViewCompat.MEASURED_SIZE_MASK & baseColor);
}