Flutter

问题 I have an alertDialog containing a DropdownButton widget. Whenever I click on an option within the dropDown I want it to display the selected value. I have listed the code below along with 2 screenshots. I believe this may be an issue with how flutter builds widget because when I placed the DropdownButton widget outside of the dialog it worked, however placing it within an alertDialog causes it to fail. I also noticed that if I clicked on an option in the DropdownButton and then exited and

问题 I am using a stream builder to detect if user logged in or not. return StreamBuilder<User>( stream: AuthService().user, builder: (context, snapshot) { if (snapshot.hasData) return SectionWrapper(); else return Authentication(); }); and this is the stream I am using Stream<User> get user { return _auth.onAuthStateChanged.map(_userFromFirebaseUser); } //create user object based on firebase user User _userFromFirebaseUser(FirebaseUser user) { return user != null ? User(uid: user.uid, email: user

问题 I am using a stream builder to detect if user logged in or not. return StreamBuilder<User>( stream: AuthService().user, builder: (context, snapshot) { if (snapshot.hasData) return SectionWrapper(); else return Authentication(); }); and this is the stream I am using Stream<User> get user { return _auth.onAuthStateChanged.map(_userFromFirebaseUser); } //create user object based on firebase user User _userFromFirebaseUser(FirebaseUser user) { return user != null ? User(uid: user.uid, email: user

问题 I had a flutter app which was working fine with firebase core (version 0.4.0 ). I upgraded the firebase_core to version 0.5.0 and did all changes as per the migration. After that ios build is giving following error Launching lib/main.dart on iPhone SE (2nd generation) in debug mode... Running Xcode build... Xcode build done. 95.9s Failed to build iOS app Error output from Xcode build: ↳ AssertMacros: amdErr = AMDeviceConnect(tmpDevice) == 0 , file: /BuildRoot/Library/Caches/com.apple.xbs

问题 I'm trying to use color , fontWeight and fontFamily with style: style.copyWith , the custom font I'm trying to use is Vonique , I've imported it like so into pubspec.yaml fonts: - family: Vonique fonts: - assets: fonts/Vonique-64-Bold-Italic.ttf - assets: fonts/Vonique-64-Italic.ttf - assets: fonts/Vonique-64-Bold.ttf - assets: fonts/Vonique-64.ttf Is this the correct way to import it? I've tried it both was with '' and without '', still doesn't change the text font. Text('Login', style:

问题 I'm trying to use color , fontWeight and fontFamily with style: style.copyWith , the custom font I'm trying to use is Vonique , I've imported it like so into pubspec.yaml fonts: - family: Vonique fonts: - assets: fonts/Vonique-64-Bold-Italic.ttf - assets: fonts/Vonique-64-Italic.ttf - assets: fonts/Vonique-64-Bold.ttf - assets: fonts/Vonique-64.ttf Is this the correct way to import it? I've tried it both was with '' and without '', still doesn't change the text font. Text('Login', style:

问题 I would like to store the camera function in a separate container as the title already says. that means, if the camera starts it is only displayed in the red container, how could i achieve this at this point? Picture of my Screen: https://imgur.com/a/0qFvHto I use the following dependency for Scanning: barcode_scan: ^1.0.0 My Code for scanning looks like this: Future _scanQR() async { try { String qrResult = await BarcodeScanner.scan(); setState(() { result = qrResult; Future.delayed(const

问题 I'm trying to use color , fontWeight and fontFamily with style: style.copyWith , the custom font I'm trying to use is Vonique , I've imported it like so into pubspec.yaml fonts: - family: Vonique fonts: - assets: fonts/Vonique-64-Bold-Italic.ttf - assets: fonts/Vonique-64-Italic.ttf - assets: fonts/Vonique-64-Bold.ttf - assets: fonts/Vonique-64.ttf Is this the correct way to import it? I've tried it both was with '' and without '', still doesn't change the text font. Text('Login', style:

问题 I'm trying to use color , fontWeight and fontFamily with style: style.copyWith , the custom font I'm trying to use is Vonique , I've imported it like so into pubspec.yaml fonts: - family: Vonique fonts: - assets: fonts/Vonique-64-Bold-Italic.ttf - assets: fonts/Vonique-64-Italic.ttf - assets: fonts/Vonique-64-Bold.ttf - assets: fonts/Vonique-64.ttf Is this the correct way to import it? I've tried it both was with '' and without '', still doesn't change the text font. Text('Login', style:

问题 I am trying to create a BLOC which depends on two other time based bloc and a non-time based bloc. What i mean with time based is, for example they are connecting a remote server so it takes time. It's working just like this: Login (It's of course taking some time) If login is successful Do another process (This is something takes time also. It returns a future.) After login and another process finishes, let the page know it. My BLOC depends on these three: final UserBloc _userBloc; final