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When Response from Server is code < 200 || code >= 300 in those cases onError() will be invoked. and other cases onNext() will invoke.

Also, If your code from onNext() throws any exception, that will be catch in onError()

You have found the correct documentation. Always one writer at a time. E.g. only a single runInTx (or put etc.) in progress at any time.

Update: Note that you do not have to worry about making write transactions sequential yourself. If multiple threads want to write at the same time (e.g. via put or runInTx), one of the treads will be selected to go first, while the other threads have to wait. It works just like a lock or synchronized in Java.

I think what you need to do is listen for text change in each of your EditText fields for all ViewHolder objects. You can set the listeners either in onBindViewHolder() or in the constructor of ViewHolder class, in your case EventViewHolder. Then you need to have to ArrayList, one for title and one for description and set them with the initial values that you put into these fields. On any text change, you can update the value in the ArrayList by using TextWatcher's onTextChanged(). When you need to pass all the values, you just need to pass the two ArrayList objects I mentioned above.

This is how your onBindViewHolder() should look like after the line where you have used setText() for your fields. titleData and descriptionData are two ArrayList objects and assumed to be initialized.

This is a bug only on Windows https://youtrack.jetbrains.com/issue/KT-17438