ExpandIconView.java 文件源码

private void updateColor(@NonNull ArgbEvaluator colorEvaluator) {
    float fraction;
    int colorFrom;
    int colorTo;
    if (colorIntermediate != -1) {
        colorFrom = alpha <= 0f ? colorMore : colorIntermediate;
        colorTo = alpha <= 0f ? colorIntermediate : colorLess;
        fraction = alpha <= 0 ? (1 + alpha / 45f) : alpha / 45f;
    } else {
        colorFrom = colorMore;
        colorTo = colorLess;
        fraction = (alpha + 45f) / 90f;
    }
    color = (int) colorEvaluator.evaluate(fraction, colorFrom, colorTo);
    paint.setColor(color);
}