How to access an arrayList from an adapter to an activity?

Question

I have created one method in an adapter. In this method I have an arraylist. I want to access this arrayList in an activity. How can I do this?

Adapter:

   public class InviteAdapter extends RecyclerView.Adapter<InviteAdapter.MyViewHolder> {

    private ArrayList<Contact> contactArrayList;
    private Context mContext;

    public class MyViewHolder extends RecyclerView.ViewHolder {
        public TextView name;
        private CheckBox checkBox;

        public MyViewHolder(View view) {
            super(view);
            name = (TextView) view.findViewById(R.id.textContactName);
            checkBox = (CheckBox) view.findViewById(R.id.checkBox);

        }
    }

    public InviteAdapter(Context context, ArrayList<Contact> contactArrayList) {
        this.contactArrayList = contactArrayList;
        this.mContext = context;

    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.invite_contact_item, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        Contact contact = contactArrayList.get(position);
        holder.name.setText(contact.getmFullName());

        holder.checkBox.setChecked(contact.getSelected());
    }

    @Override
    public int getItemCount() {
        return contactArrayList.size();
    }



    public void toggleContactsSelection( boolean isSelected ) {
        for( Contact contact : contactArrayList ) {
            contact.setSelected(isSelected);

            invite(contact);
        }
        notifyDataSetChanged(); // OR you can use notifyItemRangeChanged - which ever suits your needs
    }

    public void invite(Contact contact)
    {

        ArrayList<Invitation>  invitationArrayList = new ArrayList<>();

        SharedPreferences sharedpreferences = mContext.getSharedPreferences("UserId", Context.MODE_PRIVATE);

        String mUserId = sharedpreferences.getString("userId","");

        DateFormat df = new SimpleDateFormat("EEE, d MMM yyyy, HH:mm", Locale.ENGLISH);
        String date = df.format(Calendar.getInstance().getTime());

        Invitation invitation = new Invitation();

        invitation.setSender_id(mUserId);
        invitation.setDate(date);
        invitation.setInvitee_no(contact.getmMobileNo());
        invitation.setStatus("0");
        invitation.setUser_name(contact.getmUserName());

        invitationArrayList.add(invitation);
    }
}

I want to access invitation array list from invite method of an adapter.

Activity:

public class InviteContactsActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private InviteAdapter mAdapter;
    private ArrayList<Contact> mContactList;
    private ContactTableHelper mContactDb;
    private ArrayList<Invitation> invitationArrayList;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_invite_contacts);


        final ImageView selectAll = (ImageView)findViewById(R.id.imageMenu);

        selectAll.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                PopupMenu popup = new PopupMenu(InviteContactsActivity.this,selectAll);

                popup.getMenuInflater().inflate(R.menu.pop_up_menu, popup.getMenu());

                popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                    public boolean onMenuItemClick(MenuItem item) {

                      mAdapter.toggleContactsSelection(true); //Selects all contacts
                        return true;
                    }
                });

                popup.show();
            }
        });


        ImageView sendInvites = (ImageView)findViewById(R.id.imageSelect);

        sendInvites.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Gson gson=new Gson();
                String toServer = gson.toJson(
                        Collections.singletonMap("invitations", invitationArrayList)
                );

                new SendMultipleInvitesAsyncTask(InviteContactsActivity.this).execute(toServer);

            }
        });

        mContactDb = new ContactTableHelper(InviteContactsActivity.this);

        mContactList = mContactDb.getAllContacts();

        mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);

        mRecyclerView.setHasFixedSize(true);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(InviteContactsActivity.this);
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());

        mAdapter = new InviteAdapter(InviteContactsActivity.this, mContactList);
        mRecyclerView.setAdapter(mAdapter);
    }
}

I want to get invitation arraylist from an adapter to onClickListener of sendInvite image view.

How can I do this? Thank you..

make arraylist public inside adapter and simply access arraylist by adapter object while performing onclick — Aditi, Oct 04 '16 at 06:59
`In this method I have an arraylist`. No. That arraylist is in your adapter class. Like the method is. — greenapps, Oct 04 '16 at 07:02

score 12 · Accepted Answer · answered Oct 04 '16 at 07:03

12

Write a get method inside your adapter then call it from your activity.

    public ArrayList<Object> getArrayList(){
    return yourArrayList;
  }

Inside your activity you can get this like, yourAdapterObject.getArrayList();

answered Oct 04 '16 at 07:03

Alex Chengalan

8,211
4
42
56

score 1 · Answer 2 · edited May 23 '17 at 12:19

1

You can also use interface to send data from adpater class to activity. It is described beautifully in the link below.

Pass Data from adapter to activity using interface

edited May 23 '17 at 12:19

Community

1
1

answered Oct 04 '16 at 07:15

iamabhaykmr

1,803
3
24
49

score 0 · Answer 3 · answered Oct 04 '16 at 07:05

create ivitearraylist as a public and access in activity via adpater .

 ArrayList<Invitation>  invitationArrayList = new ArrayList<>();

public void invite(Contact contact)
    {



        SharedPreferences sharedpreferences = mContext.getSharedPreferences("UserId", Context.MODE_PRIVATE);

        String mUserId = sharedpreferences.getString("userId","");

        DateFormat df = new SimpleDateFormat("EEE, d MMM yyyy, HH:mm", Locale.ENGLISH);
        String date = df.format(Calendar.getInstance().getTime());

        Invitation invitation = new Invitation();

        invitation.setSender_id(mUserId);
        invitation.setDate(date);
        invitation.setInvitee_no(contact.getmMobileNo());
        invitation.setStatus("0");
        invitation.setUser_name(contact.getmUserName());

        invitationArrayList.add(invitation);
    }

activity code: Access invitationArrayList as adapter.invitationArrayList.

 ImageView sendInvites = (ImageView)findViewById(R.id.imageSelect);

        sendInvites.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Gson gson=new Gson();
                String toServer = gson.toJson(
                        Collections.singletonMap("invitations", mAdpater.invitationArrayList)
                );

                new SendMultipleInvitesAsyncTask(InviteContactsActivity.this).execute(toServer);

            }
        });

It might be helpful to you:)

Happy Coding:)

How to access an arrayList from an adapter to an activity?

3 Answers3