As you can see from the picture, I got a variable called item
which is an instance of BookFavorItem
.
However, when I use condition if( item is BookFavorItem )
to control the flow, it did not work as expected behavior. (I thought this condition should be true, but it didn't)
What's wrong with me?
-> flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.17.1, on Microsoft Windows [Version 10.0.19041.264], locale zh-CN)
[!] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
X Android license status unknown.
Try re-installing or updating your Android SDK Manager.
See https://developer.android.com/studio/#downloads or visit visit
https://flutter.dev/docs/get-started/install/windows#android-setup for detailed instructions.
[!] Android Studio (version 3.6)
X Flutter plugin not installed; this adds Flutter specific functionality.
X Dart plugin not installed; this adds Dart specific functionality.
[√] VS Code (version 1.45.1)
[√] Connected device (1 available)
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