缩放BottomTabBar

Question

我有3个具有不同屏幕尺寸的模拟器。我的应用程序中的TabBar小部件包含5个元素，其中包含64x64 png的png项目，并且每个屏幕尺寸都变得变形，因此我无法更改其尺寸。

static var tabBar = new TabBar(
    tabs: [

      Tab(
        child: new Container(
          width: 64.0,
          height: 32.0,
          alignment: Alignment.center,
          decoration: new BoxDecoration(
            image: DecorationImage(
                image: AssetImage("assets/BottomBar1.png"),
              //  fit: BoxFit.fill,

            ),
          ),
        ),
      ),
      Tab(
        icon: new Container(
          width: 64.0,
          height: 64.0,
          alignment: Alignment.center,
          decoration: new BoxDecoration(
            image: DecorationImage(
                image: AssetImage("assets/BottomBar2.png"),
                fit: BoxFit.fill),
          ),
        ),
      ),
      Tab(
        icon: new Container(
          width: 64.0,
          height: 64.0,
          alignment: Alignment.center,
          decoration: new BoxDecoration(
            image: DecorationImage(
                image: AssetImage("assets/BottomBar3.png"), fit: BoxFit.fill),
          ),
        ),
      ),
      Tab(
        icon: new Container(
          width: 64.0,
          height: 64.0,
          alignment: Alignment.center,
          decoration: new BoxDecoration(
            image: DecorationImage(
                image: AssetImage(
                    "assets/BottomBar1.png",
                ),
                fit: BoxFit.fill),
          ),
        ),
      ),
      Tab(
          child: Image.asset(
            "assets/BottomBar1.png",
            width: 64.0,
            height: 64.0,
          )),
    ],
    //           labelStyle: ,
    labelColor: Colors.white,
    unselectedLabelColor: Colors.white,
  ); 

我也尝试使用此方法，但是无法干预元素的大小。

Image.asset('assets/BottomBar1.png',scale: 1,width: 32,height: 32,),

我尝试删除

fit: BoxFit.fill,