CODEWITHSUNDEEP
javaandroidandroid-studioandroid-recyclerview
Matan Shalel
Matan Shalel

Reputation: 32

How to run a method only after recycler View is loaded?

I have a recyclerView. I need to fill with different types of input types so I tried putting this line after the recyclerView is made:

((EditText)recyclerView.findViewHolderForAdapterPosition(6)
.itemView.findViewById(R.id.editText))
.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);

Works fine if it's done after a button click, but if just put on the onStart() method like below:

loadrecyclerView();  //(fills the recyclerView with items)
        ((EditText)recyclerView.findViewHolderForAdapterPosition(6)
.itemView.findViewById(R.id.editText))
.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);

It doesn't work and sends the error code:

Attempt to read from field 'android.view.View androidx.recyclerview.widget.RecyclerView$ViewHolder.itemView' on a null object reference

Upvotes: 0

Views: 631

Answers (1)

snachmsm
snachmsm

Reputation: 19263

RecyclerView takes some time to draw items, they aren't ready one line after setting adapter or calling notifyDataSetChanged (or similar)

one of the ways is to wait until RecyclerView draw all its children, using post

recyclerView.post(
    new Runnable(){
        // code in here will fire when recyclerView finishes all its jobs
        // e.g. redrawing
    }
);

but its kind of hack, should be used only at least. in your case setInputType should be used inside adapter in onCreateViewHolder or maybe in onBindViewHolder, or even straight inside list item XML

Upvotes: 2

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