Flutter

问题 I asked a similar question before, but I am having trouble with Google Sign-in after publishing my app to internal and closed testing on the Play store. It works perfectly well on emulators for both Android and iOS, works great on real devices when I run it from my computer in debug and release modes, but once published to the Play store, everything breaks. The error I get is MissingPluginException(No implementation found for method init on channel plugins.flutter.io/google_sign_in) Is there

问题 I want to work with some files in flutter and so I wanted to use the Android Studio Device File Explorer to check if everything works correctly. But the Device File Explorer shows a red warning "Error initializing ADB: Android Debug Bridge not found" On a "normal" Android Project with Java there is no Problem and everything is displayed correctly. I reinstalled Android Studio, changed the AVD but nothing changed. Is this a bug in Flutter or Android Studio? Thanks for helping. 回答1: Ok, I

问题 I'm writing a Flutter app and am trying to add an element to an array. I'm trying to follow the example here: https://firebase.google.com/docs/firestore/manage-data/add-data#update_elements_in_an_array - however, My DocumentReference object does not have an update object: So, how do I go about adding an element to an array in this document? For reference, I'm using the cloud_firestore: 0.12.1 dependency. 回答1: The method you should use is updateData(). You pass to it a map. Here is an example

问题 LATEST EDIT 2nd Sept: I am not getting much traction with this, even with a bounty, so I will try and ask a simpler and more specific question. So I have reorganised the database in line with Doug's suggestions below, as I cannot otherwise reference the arrays in any way in firebase. So now I have a map of arrays, rather than just arrays. Like so: ObjectsList > CarsMap (Map) - sh899873jsa (Array) 0 "Toyota" 1 "Supra" 2 "1996" 3 "$4990" - hasd823j399 (Array) 0 "Toyota" 1 "Corolla" 2 "2014" 3 "

问题 I created an iOS single view app (hostapp) and converted it to pod workspace. Runs well. Then created flutter module (clientapp), provided iOS team. Runs well, independently. Turned off Bitcode for hostapp and clientapp, as it caused other problems. Now added clientapp to hostapp via podfile, no internal code changes. After pod install in hostapp, I tried building it. Then it throws /Users/iVoIP/Library/Developer/Xcode/DerivedData/hostapp-czxdwjjefjvrnhhdvbmaqeczngbh/Build/Products/Debug

问题 I created an iOS single view app (hostapp) and converted it to pod workspace. Runs well. Then created flutter module (clientapp), provided iOS team. Runs well, independently. Turned off Bitcode for hostapp and clientapp, as it caused other problems. Now added clientapp to hostapp via podfile, no internal code changes. After pod install in hostapp, I tried building it. Then it throws /Users/iVoIP/Library/Developer/Xcode/DerivedData/hostapp-czxdwjjefjvrnhhdvbmaqeczngbh/Build/Products/Debug

问题 I created an iOS single view app (hostapp) and converted it to pod workspace. Runs well. Then created flutter module (clientapp), provided iOS team. Runs well, independently. Turned off Bitcode for hostapp and clientapp, as it caused other problems. Now added clientapp to hostapp via podfile, no internal code changes. After pod install in hostapp, I tried building it. Then it throws /Users/iVoIP/Library/Developer/Xcode/DerivedData/hostapp-czxdwjjefjvrnhhdvbmaqeczngbh/Build/Products/Debug

问题 I am trying to create a video streaming app and want shimmer effect like facebook, any suggestion how to get it? 回答1: shimmer 1.0.1 on https://pub.dev/packages/shimmer, a package provides an easy way to add shimmer effect in Flutter project import 'package:shimmer/shimmer.dart'; SizedBox( width: 200.0, height: 100.0, child: Shimmer.fromColors( baseColor: Colors.red, highlightColor: Colors.yellow, child: Text( 'Shimmer', textAlign: TextAlign.center, style: TextStyle( fontSize: 40.0, fontWeight

问题 I would like to determine if a 'scrollable' widget indeed needs to scroll. I would ultimately like to show something like 'Scroll for more'. How do I achieve this? I could use a combination of LayoutBuilder and a ScrollController. However, ScrollController gives me maxScrollExtent and minScrollExtent only after any event - like say for example user trying to scroll I would like to know during 'build' so that I can determine to show 'Scroll for more' or not depending on the screen dimensions

问题 I would like to determine if a 'scrollable' widget indeed needs to scroll. I would ultimately like to show something like 'Scroll for more'. How do I achieve this? I could use a combination of LayoutBuilder and a ScrollController. However, ScrollController gives me maxScrollExtent and minScrollExtent only after any event - like say for example user trying to scroll I would like to know during 'build' so that I can determine to show 'Scroll for more' or not depending on the screen dimensions