Question 126707 in Android Studio Question posted in
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Android Studio – ImageView.setBackgroundResource

Attempt to invoke virtual method ‘void
android.widget.ImageView.setBackgroundResource(int)’ on a null object
reference
at com.Adapter.MessageAdapter.onBindViewHolder(MessageAdapter.java:240)
at com.Adapter.MessageAdapter.onBindViewHolder(MessageAdapter.java:37)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7093)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7172)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6037)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6304)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6143)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6139)
at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next

 public class ViewHolder extends RecyclerView.ViewHolder {

        public ImageView read_chat;

}

onBindViewHolder

public void onBindViewHolder(@NonNull MessageAdapter.ViewHolder holder, int position) {

    int type = holder.getItemViewType();
    Chat chat = mChat.get(position);

    if (chat.isIsseen()) {
        holder.read_chat. setBackgroundResource(R.drawable.ic_check_double_fill_read);    
    } else {
        holder.read_chat. setBackgroundResource(R.drawable.ic_check_double_fill);
    }

}

ViewHolder view

public ViewHolder(View itemView) {
super(itemView);

  read_chat = itemView.findViewById(R.id.read_chat);

}
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2

Answers


  1. 0

    I’m not sure what you did in your onCreateViewHolder function, but generally when I see this it’s because you inflated the wrong layout. Make sure you are inflating your list_item xml layout. Hope this helps.

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  2. 0

    Try this

    imageView.setImageDrawable(getResources().getDrawable(R.drawable.your_selected_image));
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