listview

问题 I have a very simple Firebase Database which looks like this: This is my model: public class ShoppingListModel { private String shoppingListName; private Map<String, String> usersMap; public ShoppingListModel() {} public void setShoppingListName(String shoppingListName) {this.shoppingListName = shoppingListName;} public String getShoppingListName() {return shoppingListName;} public void setUsersMap(Map<String, String> usersMap) {this.usersMap = usersMap;} public Map<String, String>

问题 When clicking the add button, the same widget is replicated. The widget contains the list of checkboxes that are multi selectable. I am able to replicate the widget but I got problem to handle the checkboxes according to the index of the widget. In image below the checkbox checked state is replicated along with the new add widget. I have implemented as follows: Build the widget according to the addbutton click ListView.builder( itemCount: counting, shrinkWrap: true, physics: const

问题 I have checkboxes in my custom listview, I'm using a boolean array to save the state of these checkboxes. I want to make the state of checkboxes persistent through out the lifetime of the app.I know that this can be achieved through sharedpreferences, but I don't exactly know how this can be done. 回答1: I know that this can be achieved through sharedpreferences, but I don't exactly know how this can be done. There is no option to push serializable objects into sharedpreferences. Because of

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/

问题 With the new ListView add two or more children. Scroll down the list to the point where the first child is entirely off the screen. Scroll all the way back up to the initial position. The ListView shows nothing on screen (just white empty space). Currently I'm facing this problem after upgrading the flutter to the latest version. Please help me fixing this issue. https://github.com/flutter/flutter/issues/8155 My error and issue is exactly same as provided in this case. 来源： https:/

问题 I am trying to build a news reader app using Flutter. However, the challenge I am facing is that I need to show different layouts based on the dimensions of the network image. I researched around this and couldn't find a solution. Please help. 回答1: I somehow made a workaround not using the listview and using the singlechildscrollview in horizontal direction and list of row widgets. Just check out the example that I have made : I have taken the JSON data locally using the list of network

问题 Show day for ex:- today, tommorow, 28 Dec 2020 etc after comparing date from sqlite db in a list tile with present date. And also delete a particular item from list on app start if the day was yesterday. In present it is showing like 21-11-2020 and if the date has expired also it still continues to show. This is my Code List<Note2> items2 = new List(); DatabaseHelper2 db2 = new DatabaseHelper2(); db2.getAllNotes2().then((notes2) { setState(() { notes2.forEach((note2) { items2.add(Note2

问题 Show day for ex:- today, tommorow, 28 Dec 2020 etc after comparing date from sqlite db in a list tile with present date. And also delete a particular item from list on app start if the day was yesterday. In present it is showing like 21-11-2020 and if the date has expired also it still continues to show. This is my Code List<Note2> items2 = new List(); DatabaseHelper2 db2 = new DatabaseHelper2(); db2.getAllNotes2().then((notes2) { setState(() { notes2.forEach((note2) { items2.add(Note2

问题 This question already has answers here : What is a NullPointerException, and how do I fix it? (12 answers) Closed 2 years ago . I try to create a ListView which showes my Pojos called "Baustelle". I wrote a Adapter and a ViewHolder as I learned it in school but the difference is that we only did it for the MainActivity in my school. Now i tried to use a Fragment for it but I always get this Error: "Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' on a