對象沒有從復選框的CheckedChange偵聽器的列表中刪除

Question

我有一個聯系人列表。 我有一個復選框來選擇聯系人。 我想將這些選定的聯系人添加到另一個稱為邀請數組列表的列表中。 我已經創建了一種方法，如果選中復選框，則將其添加到邀請列表中的所有聯系人，稱為toogleContactsSelection。 我在活動中使用的。

如果選中了復選框，我已經創建了另一種在邀請arraylist中添加聯系人的方法。

現在，如果未選中復選框，即復選框的onCheckChangeListener，我想從邀請數組列表中刪除對象。

但是對象沒有從邀請數組列表中刪除。

適配器：

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

        private ArrayList<Contact> contactArrayList;
        private Context mContext;
        public ArrayList<Invitation>  invitationArrayList = new ArrayList<>();

        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, final int position) {
            final Contact contact = contactArrayList.get(position);
            holder.name.setText(contact.getmFullName());

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

            holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                    if(b)
                    {
                        invite(contact);

                        Log.e("inviteList",String.valueOf(invitationArrayList.size()));
                    }
                    else {
                        invitationArrayList.remove(contact);

                        Log.e("inviteList",String.valueOf(invitationArrayList.size()));
                    }
                }
            });
        }

        @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)
        {

            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);

        }

        public void removeInvite(int position)
        {
            invitationArrayList.remove(position);
        }

        public ArrayList<Invitation> getArrayList(){
            return invitationArrayList;
        }

    }


What is going wrong?

EDIT:

This is an adpater :


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

    private ArrayList<Contact> contactArrayList;
    private Context mContext;
    public ArrayList<Invitation>  invitationArrayList = new ArrayList<>();

    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(final MyViewHolder holder, final int position) {
        final Contact contact = contactArrayList.get(holder.getAdapterPosition());
        holder.name.setText(contact.getmFullName());

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

        holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {

                if(b)
                {
                    invite(contact);

                    Log.e("inviteList",String.valueOf(invitationArrayList.size()));
                }
                else {

                    contactArrayList.get(position).setSelected(false);
                 //   holder.checkBox.setChecked(false);
                  // updateInvites();
                    Log.e("inviteList",String.valueOf(invitationArrayList.size()));
                }
            }
        });
    }

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

    }
    public void setChecked()
    {
        for( Contact contact : contactArrayList ) {


        }
    }


    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)
    {

        Invitation invitation = new Invitation();

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

            invitationArrayList.add(invitation);

    }
    public ArrayList<Invitation> getArrayList(){
        return invitationArrayList;
    }

    public void updateInvites(){
        invitationArrayList.clear();
        for(Contact contact : contactArrayList){
            if(contact.getSelected()){

                invite(contact);
            }
        }
    }
}

這是活動的代碼：

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

            mAdapter.updateInvites(); // updating list on sendInvites, 

            invitationArrayList = mAdapter.getArrayList();

            Log.e("inviteList",String.valueOf(invitationArrayList.size()));

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

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

            finish();
            Intent i = new Intent(InviteContactsActivity.this,InviteContactsActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
            startActivity(i);
        }
    });

現在，我正在更新onSendInvites的列表，但是當我選中或取消選中api時，它的行為可能不符合預期。

Answer 1

好，所以我說的愚蠢錯誤很少，

一種。 更換

final Contact contact = contactArrayList.get(position);

與

final Contact contact = contactArrayList.get(holder.getAdapterPosition());

b。 您正在添加班級Invitation對象

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);

C。 您正在嘗試刪除類Contacts對象

else {
                    invitationArrayList.remove(contact);

                    Log.e("inviteList",String.valueOf(invitationArrayList.size()));
                }

解

在onBindViewHolder中

   holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
            contactArrayList.get(holder.getAdapterPosition()).setSelected(b);
            Log.e("inviteList",String.valueOf(invitationArrayList.size()));
            }
        });

然后做一個像

private void updateInvites(){
    invitationArrayList.clear();
    for(Contacts contacts : contactsArrayList){
        if(contacts.isSelected()){
             invite(contact);
        }
    }
}

這里contact.setSeletected(boolean status)和contact.isSelected()分別是設置方法和獲取方法

編輯： 這是我在RecyclerView上的博客的鏈接，該博客解釋了Simple RecyclerView的大多數概念。

Answer 2

而不是使用對象來刪除使用索引來刪除項目：

   invitationArrayList.remove(position);

它會工作。

您的索引超出范圍，因為用戶可能會在添加項目之前將其刪除。 可能是您的InvitationArrayList中不存在的特定元素。 因此，請嘗試以下代碼：

if (invitationArrayList!=null && invitationArrayList.size() > 0 && invitationArrayList.size() > position +1){
 invitationArrayList.remove(position);
}