listview

问题 Sorry I am now in programming, but I an learning do please help me. I am stuck at this issue. This is one of my first app, and allmost done so need at likke help to get it done. I am getting this error: type '_InternalLinkedHashMap' is not a subtype of type 'DocumentSnapshot' The code looks like this: import 'package:flutter/material.dart'; import 'package:brew_app/services/auth.dart'; import 'package:cloud_firestore/cloud_firestore.dart'; class Home extends StatelessWidget { final

问题 I'm trying to build a horizontal slider (ListView) of widgets, and want to add a button at the end of the ListView (so that you could add another card). So far if I try to add it via the list of widgets that is being pulled from to generate the ListView.builder, it doesn't allow me because the widget is different than the widgets I specify the list is being made off. I don't know how to add it at the end of the list another way. I have been able to put it next to the list, but that takes up

问题 I'm trying to build a horizontal slider (ListView) of widgets, and want to add a button at the end of the ListView (so that you could add another card). So far if I try to add it via the list of widgets that is being pulled from to generate the ListView.builder, it doesn't allow me because the widget is different than the widgets I specify the list is being made off. I don't know how to add it at the end of the list another way. I have been able to put it next to the list, but that takes up

问题 I'm trying to build a horizontal slider (ListView) of widgets, and want to add a button at the end of the ListView (so that you could add another card). So far if I try to add it via the list of widgets that is being pulled from to generate the ListView.builder, it doesn't allow me because the widget is different than the widgets I specify the list is being made off. I don't know how to add it at the end of the list another way. I have been able to put it next to the list, but that takes up

问题 I have the following example (tested on an iPhone X, iOS 11): import 'package:flutter/material.dart'; void main() => runApp(new MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String

问题 I have the following example (tested on an iPhone X, iOS 11): import 'package:flutter/material.dart'; void main() => runApp(new MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( title: 'Flutter Demo', theme: new ThemeData( primarySwatch: Colors.blue, ), home: new MyHomePage(title: 'Flutter Demo Home Page'), ); } } class MyHomePage extends StatefulWidget { MyHomePage({Key key, this.title}) : super(key: key); final String

问题 I created a simple Android ListView with an ArrayAdapter as shown below ListView lView; ArrayList<String> listItems; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lView = findViewById(R.id.mainListView); listItems = new ArrayList<>(); updateView(42); lView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> p1, View p2, int p3, long p4) { View v = lView.getChildAt(p3 -

问题 I created a simple Android ListView with an ArrayAdapter as shown below ListView lView; ArrayList<String> listItems; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); lView = findViewById(R.id.mainListView); listItems = new ArrayList<>(); updateView(42); lView.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> p1, View p2, int p3, long p4) { View v = lView.getChildAt(p3 -

问题 I have been searching for hours , to no vail. I have a ListView that is built with this constructor ListView.builder( itemCount: 5, itemBuilder: (context, int index) { return ServiceCard(index: index,); }, ), now in the ServiceCard widget I have a button to delete the current widget in the ListView tree for example the 3rd ServiceCard widget. Tried many methods that didn't work. I am surprised that even the flutter documentation doesn't show how to implement such a common functionality. I

问题 I have a ListView and I would like to change the color of the selected item in the list. I can change the color of the selected item below, but how do I revert (or change) the color of all the other items back to their original color? @Override public void onListItemClick(ListView parent, View v, int position, long id) v.setBackgroundColor(Color.CYAN); } I tried changing the color of the parent but it doesn't change the color of the items: @Override public void onListItemClick(ListView parent