AppCompatDrawableManager.java 文件源码

private static boolean tintDrawableUsingColorFilter(@NonNull Context context, @DrawableRes int resId, @NonNull Drawable drawable) {
    Mode tintMode = DEFAULT_MODE;
    boolean colorAttrSet = false;
    int colorAttr = 0;
    int alpha = -1;
    if (arrayContains(COLORFILTER_TINT_COLOR_CONTROL_NORMAL, resId)) {
        colorAttr = R.attr.colorControlNormal;
        colorAttrSet = true;
    } else if (arrayContains(COLORFILTER_COLOR_CONTROL_ACTIVATED, resId)) {
        colorAttr = R.attr.colorControlActivated;
        colorAttrSet = true;
    } else if (arrayContains(COLORFILTER_COLOR_BACKGROUND_MULTIPLY, resId)) {
        colorAttr = 16842801;
        colorAttrSet = true;
        tintMode = Mode.MULTIPLY;
    } else if (resId == R.drawable.abc_list_divider_mtrl_alpha) {
        colorAttr = 16842800;
        colorAttrSet = true;
        alpha = Math.round(40.8f);
    }
    if (!colorAttrSet) {
        return false;
    }
    if (DrawableUtils.canSafelyMutateDrawable(drawable)) {
        drawable = drawable.mutate();
    }
    drawable.setColorFilter(getPorterDuffColorFilter(ThemeUtils.getThemeAttrColor(context, colorAttr), tintMode));
    if (alpha != -1) {
        drawable.setAlpha(alpha);
    }
    return true;
}