Add a new item to recyclerview programmatically

Question

I m still trying to get my head around recyclerview   I have an arraylist  that I use to initialize a recycler view with   How can I add new items to the recycler view post setting an adapter and layoutmanager   private void initData             mItems   new ArrayList lt String gt             for  int i   0  i  lt  ITEMS COUNT  i                  mItems add  Item      i   1                         private void initRecyclerView             mRecentRecyclerView    RecyclerView  findViewById R id recentrecyclerView           mRecentRecyclerView setHasFixedSize true           mRecentLayoutManager   new LinearLayoutManager this           mRecentRecyclerView setLayoutManager mRecentLayoutManager              mAdapter   new RecyclerView Adapter lt CustomViewHolder gt                   Override             public CustomViewHolder onCreateViewHolder ViewGroup viewGroup  int i                    View view   LayoutInflater from viewGroup getContext    inflate R layout notice snippet                           viewGroup  false                   return new CustomViewHolder view                               Override             public void onBindViewHolder CustomViewHolder viewHolder  int i                    viewHolder noticeSubject setText mItems get i                                Override             public int getItemCount                     return mItems size                                      mRecentRecyclerView setAdapter mAdapter        private class CustomViewHolder extends RecyclerView ViewHolder            private TextView noticeSubject           public CustomViewHolder View itemView                super itemView                noticeSubject    TextView  itemView findViewById R id notice subject                     So basically after I  initdata   and initRecyclerView    how do i add a new item to the RecyclerView

User · Answer

simply add to your data structure   mItems     and then notify your adapter about dataset change  private void addItem String item      mItems add item     mAdapter notifyDataSetChanged       addItem  New Item

User · Answer

if you are adding multiple items to the list use this   mAdapter notifyItemRangeInserted startPosition  itemcount     This notify any registered observers that the currently reflected itemCount items starting at positionStart have been newly inserted  The item previously located at positionStart and beyond can now be found starting at position positinStart itemCount  existing item in the dataset still considered up to date

User · Answer

First add your item to mItems and then use   mAdapter notifyItemInserted mItems size   - 1     this method is better than using   mAdapter notifyDataSetChanged      in performance

[android] Add a new item to recyclerview programmatically?

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