Author: DravitLochan

case R.id.menu_item_important:
    nSelected = getSelectedItems().size();
    if (nSelected >0)
    {
        for (int i = nSelected - 1; i >= 0; i--) 
        {
            markImportant(getSelectedItems().get(i));
        }
        if(nSelected == 1) 
        {
            Toast.makeText(context,nSelected+" message 
            marked 
            important",Toast.LENGTH_SHORT).show();
        } 
        else 
        {
            Toast.makeText(context, nSelected + " 
            messages marked important",                                                      
            Toast.LENGTH_SHORT).show();
        }
        Important = realm.where(ChatMessage.class).
        equalTo("isImportant",true)
        .findAll().sort("id");
        for(int i=0;i<important.size();++i)
            Log.i("message ","" + 
            important.get(i).getContent());
        Log.i("total ",""+important.size());
        actionMode.finish();
    }
return true;

public void markImportant(final int position) {
    realm.executeTransaction(new Realm.Transaction() {
        @Override
        public void execute(Realm realm) {
            ChatMessage chatMessage = getItem(position);
            chatMessage.setIsImportant(true);
            realm.copyToRealmOrUpdate(chatMessage);
        }
    });
}

public class ImportantMessages extends AppCompatActivity {
 
    private Realm realm;
    private RecyclerView rvChatImportant;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       realm = Realm.getDefaultInstance();
       rvChatImportant = (RecyclerView) findViewById 
                          (R.id.rv_chat_important);
       actionBar.setDisplayHomeAsUpEnabled(true);
       setChatBackground();
       setupAdapter();
 
        //call to other methods
    }
 
    private void setupAdapter() {
        rvChatImportant = (RecyclerView) findViewById 
                          (R.id.rv_chat_important);
        LinearLayoutManager linearLayoutManager = new 
                            LinearLayoutManager(this);
        linearLayoutManager.setStackFromEnd(true);
        rvChatImportant. 
        setLayoutManager(linearLayoutManager);
        rvChatImportant.setHasFixedSize(false);
        RealmResults<ChatMessage> importantMessages = 
        realm.where(ChatMessage.class). 
        equalTo("isImportant",true).findAll().sort("id");
        TextView tv_msg = (TextView) findViewById 
                          (R.id.tv_empty_list);
 
        if(importantMessages.size()!=0)
            tv_msg.setVisibility(View.INVISIBLE);
        else
            tv_msg.setVisibility(View.VISIBLE);
 
        ChatFeedRecyclerAdapter recyclerAdapter = new 
             ChatFeedRecyclerAdapter(Glide.with(this), this, 
             importantMessages, true);
        rvChatImportant.setAdapter(recyclerAdapter);
        rvChatImportant.addOnLayoutChangeListener(new 
        View.OnLayoutChangeListener() {
            @Override
            public void onLayoutChange(View view, int left, 
            int top, int right, int bottom,
            int oldLeft, int oldTop, int oldRight, int 
            oldBottom) {
                if (bottom < oldBottom) {
                    rvChatImportant.postDelayed(new 
                    Runnable() {
                        @Override
                        public void run() {
                            int scrollTo = 
                            rvChatImportant.getA 
                            dapter().getItemCount() - 1;
                            scrollTo = scrollTo >= 0 ? 
                            scrollTo : 0;                             
                            rvChatImportant. 
                            scrollToPosition(scrollTo);
                        }
                    }, 10);
                }
            }
        });
    }
}