Avoiding RecyclerView ViewHolder Events During Notify

Question

I have a RecyclerView whose ViewHolder contains elements with events (such as the TextChanged event of EditText). I have a point in my code in which I want to clear the item list & add new items (sort of start over). However, during this process the TextChanged event is being triggered for EditText(s) in ViewHolder I no longer need (that should just be used after being recycled). When I override OnViewRecycled, I detach these event handlers, but that doesn't seem to be helping. How can I prevent or detach events when calling NotifyDataSetChanged()?

Answer 1

Hello,​

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However, during this process the TextChanged event is being triggered for EditText(s) in ViewHolder

Hi, njsokalski. I created a basic demo to test the function, the TextChanged event will not be triggered when clearing and adding new items. Here is the code of my project, please check it. If it doesn't work on your side, please share the related code to reproduce the issue.

   private async void MainActivity_Click(object sender, EventArgs e)  
   {  
       list.Clear();  
       list.Add(new model { ... });  
       ...  
       myadapter.NotifyDataSetChanged();  
   }  

Custom ViewHolder class

   public class CustomViewHolder : RecyclerView.ViewHolder  
   {  
       public EditText Edit { get; private set; }  
     
       public _ViewHolder(View itemView) : base(itemView)  
       {  
           Edit = itemView.FindViewById<EditText>(Resource.Id.edit);  
           Edit.TextChanged += delegate  
           {  
               //  
           };  
       }  
   }  

Best Regards,

Jarvan Zhang

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