RecyclerView.ViewHolder goes null outside onBindViewHolder method

Question

i am creating a custom adapter where i am using two view holders, if the list is at position 0 holder object is casted to first view holder otherwise to second. the issue is when i am using that first view holder object outside onBindViewHolder it throws null pointer exception. here is my code

 @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) { if (position == 0) { firstholder = (FirstHolder) holder; } else { secondholder = (SecondHolder) holder; } } public void runnable(final int size) { handler = new Handler(); runnable = new Runnable() { @Override public void run() { if (firstholder.ViewPager.getCurrentItem() == size - 1) { firstholder.ViewPager.setCurrentItem(0); } else { firstholder.ViewPager.setCurrentItem(firstholder.ViewPager.getCurrentItem() + 1, true); } handler.removeCallbacks(Runnable); handler.postDelayed(Runnable, 1000); } } }; }

its throwing exception when called in runnable. Note that: both viewholder objects are global

Can you post the stack trace? which line is throwing NullPointer? Also post the code for the remainder of the adapter, specifically onCreateViewHolder and getItemViewType methods — Zain
– Zain, Commented Jan 4, 2017 at 12:28
in run method where i am calling viewpager through firstholder — User
– User, Commented Jan 4, 2017 at 12:30
"Runnable = new Runnable()"? , you should have some variable "Runnable runs=new Runnable()" — Ali Asheer
– Ali Asheer, Commented Jan 4, 2017 at 12:30
I think he means here: firstholder.ViewPager.getCurrentItem() — Leonardo
– Leonardo, Commented Jan 4, 2017 at 12:32

Malik Abu Qaoud · Accepted Answer · 2017-01-04 12:37:29Z

try to use this

final int itemType = getItemViewType(position); if (itemType == 0) { firstholder = (FirstHolder) holder; }else { secondholder = (SecondHolder) holder; }

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