C#•13mo ago

❔ MvvmCross - MvxRecyclerView GetChildAt(position) returns null

i have a problem where GetChildAt returns null for all elements out of view ( i have a MvxRecyclerView with many elements and they don't all fit in the screen - have a scroll component) GetChildAt work only on all elements that are visible (fit in the screen) when i click a certain button. There are solution for java/javascript apps but they don't work with xamarin. Anybody has any idea how to make it work?

c#
[Activity()]
public class MyView : MvxActivity<MyViewModel>
{
    protected override void OnCreate(Bundle bundle)
      {
        base.OnCreate(bundle);
        ///...some code
        Button btnSave = FindViewById<Button>(Resource.Id.SaveButton);
        btnSave.Click += async delegate {
          var signatoryList = FindViewById<MvxRecyclerView>(Resource.Id.signatoryList);
    
          int position = 0;
          bool signaturesSaved = false;
    
          foreach (Signatory signatory in signatoryList.ItemsSource)
          {
              try
                {
                    RecyclerView.ViewHolder holder = signatoryList.FindViewHolderForItemId(Resource.Id.signatoryList);
                    View signatoryView = signatoryList.GetChildAt(position);
                    signaturePad = signatoryView.FindViewById<SignaturePadView>(Resource.Id.signatureImage);
                    
                    ///... save the signature byte array

c#
[Activity()]
public class MyView : MvxActivity<MyViewModel>
{
    protected override void OnCreate(Bundle bundle)
      {
        base.OnCreate(bundle);
        ///...some code
        Button btnSave = FindViewById<Button>(Resource.Id.SaveButton);
        btnSave.Click += async delegate {
          var signatoryList = FindViewById<MvxRecyclerView>(Resource.Id.signatoryList);
    
          int position = 0;
          bool signaturesSaved = false;
    
          foreach (Signatory signatory in signatoryList.ItemsSource)
          {
              try
                {
                    RecyclerView.ViewHolder holder = signatoryList.FindViewHolderForItemId(Resource.Id.signatoryList);
                    View signatoryView = signatoryList.GetChildAt(position);
                    signaturePad = signatoryView.FindViewById<SignaturePadView>(Resource.Id.signatureImage);
                    
                    ///... save the signature byte array

1 Reply

Accord•13mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ MvvmCross - MvxRecyclerView GetChildAt(position) returns null