开发日记：占位显示

Shimmer(
                gradient: LinearGradient(colors: [
                  appcolor.black.withOpacity(0.3),
                  appcolor.gary.withOpacity(0.3)
                ]),
                child: Container(
                  decoration: BoxDecoration(
                      borderRadius: BorderRadius.circular(8),
                      color: appcolor.gary.withOpacity(0.3)),
                ),
              )