android-studio - flutter 应用栏中不需要的操作按钮

Question

我正在构建一个屏幕，它有一个底部导航栏，我在其中放置了一个汉堡操作按钮和一个 float 按钮，还有一个应用栏，我想在其中放置我的应用程序 Logo 。

即使我没有对应用栏进行任何操作，汉堡图标仍然出现在标题的左侧。

我只想在应用栏中显示标题。

这是我的代码:

   appBar: new AppBar(
    title: new Image.asset('assets/logo/logo-home.png', fit: BoxFit.fitHeight),
    actions: null,
    backgroundColor: Colors.black,
    elevation: 0.0,
  ),


  key: _scaffoldKey,
  floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
  floatingActionButton: FloatingActionButton(
    child: ImageIcon(new AssetImage("assets/icons/star.png"), color: Colors.black),
    backgroundColor: Colors.white,
    onPressed: scan,
  ),
bottomNavigationBar: BottomAppBar(
    color: Color.black,
    child: new Row(
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: <Widget>[
        IconButton(icon: Icon(Icons.menu), color: Colors.white, onPressed: ()=> _scaffoldKey.currentState.openDrawer(),),
      ],
    ),
  ),

Answer 1

如果脚手架有一个抽屉并且应用栏不包含“leading”属性(或具有空值)，应用栏将在其操作中附加一个菜单图标。

它在 documents 中提到:

If the leading widget is omitted, but the AppBar is in a Scaffold with a Drawer, then a button will be inserted to open the drawer. Otherwise, if the nearest Navigator has any previous routes, a BackButton is inserted instead. This behavior can be turned off by setting the automaticallyImplyLeading to false. In that case a null leading widget will result in the middle/title widget stretching to start.

解决方案很简单，只需将应用栏中的 title 属性替换为 leading

  appBar: new AppBar(
        leading: new Image.asset('assets/logo/logo-home.png', fit: BoxFit.fitHeight),
        actions: null,
        backgroundColor: Colors.black,
        elevation: 0.0,
  ),