和showBottomSheet相比，主要的区别在于ShowModalBottomSheet在顶部有蒙层，点击会消失，然而showBottomSheet是没有的。
showBottomSheet效果图：
ShowModalBottomSheet 先看一下效果。
下面就看一下Dart语言实现
floatingActionButton: new FloatingActionButton(
onPressed: () {
showModalBottomSheet(
context: context,
builder: (BuildContext context){
return new Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
new ListTile(
leading: new Icon(Icons.photo_camera),
title: new Text("Camera"),
onTap: () async {
imageFile = await ImagePicker.pickImage(source: ImageSource.camera);
Navigator.pop(context);
},
),
new ListTile(
leading: new Icon(Icons.photo_library),
title: new Text("Gallery"),
onTap: () async {
imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
Navigator.pop(context);
},
),
],
);
}
);
},
foregroundColor: Colors.white,
child: Text('点我'),
),
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