Flutter

问题 So I've looked several places for how this is supposed to be implemented and I'm sure I'm missing something trivial, but I have a flutter app with a Scaffold who's body is a PageView. I need to have a different FAB for some pages and the way it's currently set up is the floatingActionButton attribute of the scaffold is set to access an array of FloatingActionButtons with the index being the _currentPageIndex (private variable shared by bottomNavBar and _pageController. This changes the FAB

问题 i have gridview from local list now i want to populate that gridview from api any idea how to do it, this is how my api response look like { "status": "SUCCESS", "data": [ { "img": "http://3.127.255.230/rest_ci/assets/uploads/products/1589784928__food12.jpg", "name": "Fruit Salad" }, { "img": "http://3.127.255.230/rest_ci/assets/uploads/products/1589784733__food12.jpg", "name": "Fruit Salad" }, { "img": "assets/food3.jpeg", "name": "Hamburger" }, ] } this is my static (local list) code for

问题 I'm creating an app using flutter, in this I'm creating a post request then reading the response as string (later to convert into json). Future<String> post([String url = "https://example.com/get-new"]) async { return await http.post(Uri.encodeFull(url), headers: {"Accept": "application/json"}).then((http.Response response) { final int statusCode = response.statusCode; if (statusCode < 200 || statusCode > 400) { throw new Exception("Error while fetching data"); } return response.body; }); }

问题 Without stopping the service, my app sometimes needs to remove the notification when the music stops playing (of course, the notification needs to be displayed again when some other music playing). Is there a soluation? Because the service switch consumes too much 来源： https://stackoverflow.com/questions/64712447/flutter-package-audio-service-is-there-a-way-to-remove-the-notification-from-th

问题 List results; setState(() { var resBody = json.decode(res.body); print('Response body: ${resBody}'); results = resBody; }); Navigator.push( context, MaterialPageRoute( builder: (context) => SecondScreen(jsondata: results,), )); results is a jsondata and pass it to the second screen as jsondata In secondscreen how to retrieve jsondata ? 回答1: This may help you. Let me know class SecondScreen extends StatefulWidget { final List jsondata; SecondScreen({Key key, this.jsondata}) : super(key: key);

问题 I am making an app which loads the CSV file and show it as a list view But I can't see my data I don't know why it is doing like this. Here is the csv link a link! When I run my app I see only this Instead, I want to fill the empty space like this Here is the code import 'package:flutter/material.dart'; import 'package:csv/csv.dart'; import 'dart:async' show Future; import 'package:flutter/services.dart' show rootBundle; class TableLayout extends StatefulWidget { @override _TableLayoutState

问题 I'm quite new about flutter and kotlin. I'm doing flutter version up(from 1.0.0 to 1.7.8+hotfix4) recently. After I upgrade kotlin version to 1.3.10, my flutter app came into crash when I try to start it. And the error shows like this : [ +521 ms] E/AndroidRuntime( 2726): FATAL EXCEPTION: DefaultDispatcher-worker-2 [+1 ms] E/AndroidRuntime( 2726): Process: XXXXXXXXXXXX, PID: 2726 [ ] E/AndroidRuntime( 2726): java.lang.RuntimeException: Methods marked with @UiThread must be executed on the

问题 From the run terminal of android studio: FAILURE: Build failed with an exception. Where: Script 'C:\Flutter\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 362 What went wrong: A problem occurred configuring project ':cloud_firestore_web'. Could not find method implementation() for arguments [project ':firebase_core'] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler. Try: Run with --stacktrace option to get the stack trace. Run with

问题 I have this code that I can't get to work properly. I have a Food class and I have initialized the name, price, and unique ID strings on it. I made the unique ID to be Uuid().v4(), which would give each food item a random string. FOOD CLASS class Food { String name; String price; String uniqueID = Uuid().v4(); Food({this.name, this.price, this.uniqueID})} On another page I have a Provider function that would add items in the cart, it is a list of string items (this may not be the best option)

问题 So I am currently trying to create an Appbundle so I can upload my app to the google play store. Unfortunately, I encountered a problem with the signature release portion of the project. Below is the copy of the error from the terminal: FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:packageRelease'. > com.android.ide.common.signing.KeytoolException: Failed to read key key from store "/Users/herb/Downloads/morningly/android/app/key.jks": keystore