小编Cod*_*24h的帖子

Flutter项目中如何获取本地视频文件的第一帧？这是我的代码：

ImagePicker.pickVideo(source: ImageSource.camera).then((File file) {
  if (file != null && mounted) {
    //I got the video file here, but I want to get the first frame of the video.
  }
 });
},

如何获取文本行数在Flutter项目中，我们需要确定文本行数是否超过3，然后将显示提示消息。我们如何使用代码来实现它？

    final List<Tab> myTabs = <Tab>[
    new Tab(text: 'a'),
    new Tab(text: 'b'),
    new Tab(text: 'c'),
    new Tab(text: 'd'),
    new Tab(text: 'e'),
  ];

然后

    appBar: new AppBar(
          elevation: 0,
          title: _barSearch(),
          backgroundColor: Colors.white,
          bottom: TabBar(
            isScrollable: true,
            tabs: myTabs,
            labelColor: Color(0xffFF645C),
            labelStyle:TextStyle(fontSize: 14.0),
            unselectedLabelStyle:TextStyle(fontSize: 14.0),
            unselectedLabelColor: Color(0xff343434),
            indicatorColor: Color(0xffFF645C),
            indicatorSize: TabBarIndicatorSize.label,
            indicatorPadding: EdgeInsets.only(bottom: 8.0),
          ),
        ),

它显示了我如何使用标签栏。但现在，我发现我的 Tabbar 布局类似于 spaceAround 的布局。

但我们的项目经理要求我使用 spaceBetween。

我使用 image_picker 开发了视频录制。我们需要限制视频录制时间。

pubspec.yaml 依赖项：image_picker：^0.4.10

[flutter] flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[?] Flutter (Channel beta, v1.0.1-pre.2, on Mac OS X 10.14.2 18C54, locale zh-Hans-CN)
[?] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[?] iOS toolchain - develop for iOS devices (Xcode 10.1)
[?] Android Studio (version 3.0)
[?] IntelliJ IDEA Ultimate Edition (version 2018.1.7)
[?] VS Code (version 1.31.1)
[?] Connected device (2 available)

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