CODEWITHSUNDEEP
mvvmdata-bindingandroid-listviewxamarinmvvmcross
thedigitalsean
thedigitalsean

Reputation: 299

MvvmCross DataBinding To Modify Individual Item in Android ListView

I am trying to dynamically modify the items in a List (ObservableCollection) of a ViewModel and have those changes get updated in the View via MvvmCross bindings. My eventual goal is that when a user clicks on a list item, I will pop up a dialog asking them to edit that item. When the dialog is dimissed, the viewmodel will get updated (through an ICommand I assume) and that modified value will be now be in the list.

I haven't looked into dialogs yet, so for now I am just trying to toggle a boolean value each time a list item is clicked and have that value changed in the MvxListView. I have the MxvListView in my View bound to an ObservableCollection in my ViewModel and have an MvxCommand that is getting called when an item is selected. All this is working and I can see the value getting changed in the debugger, however, the new values are not being displayed in the MvxListView. So my question is: How do I get modified data in individual items in an ObservableCollection to bind to an MvxListView?

All of the examples I have seen online use ObservableCollection for dynamic binding but they only ever Add or Delete items. I haven't found any examples of modifying the items. If I change the code in my MvxCommand from modifying the data to adding or deleting an item, the list will get updated. So that tells me I'm close I think.

Rather than copy paste the code in here, I created a sample project on github here to look at: https://github.com/smulrich/breaktimer

I appreciate the help.

Upvotes: 1

Views: 818

Answers (1)

RyanWang
RyanWang

Reputation: 178

You can simply replace
Breaks[index] = b;
with
Breaks[index] = new DailyBreak() { Reason = b.Reason, TimeOfDay = b.TimeOfDay, Enabled = b.Enabled };

or more reasonable, you should realize INotifyPropertyChanged for class DailyBreak Diffrent among List, ObservationCollection and INotifyPropertyChanged, please refer to enter link description here

Upvotes: 2

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