DrawableUtils.java 文件源码

static boolean setContainerConstantState(DrawableContainer drawable,
        Drawable.ConstantState constantState) {
    if (Build.VERSION.SDK_INT >= 9) {
        // We can use getDeclaredMethod() on v9+
        return setContainerConstantStateV9(drawable, constantState);
    } else {
        // Else we'll just have to set the field directly
        return setContainerConstantStateV7(drawable, constantState);
    }
}