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我有一个联系人列表。我有一个复选框来选择联系人。我想将这些选定的联系人添加到另一个称为邀请数组列表的列表中。如果复选框被选中，我创建了一个方法来添加邀请列表中的所有联系人，称为 toogleContactsSelection。这是我在活动中使用的。

如果选中复选框，我创建了另一种方法来在邀请数组列表中添加联系人。

现在，如果未选中复选框，即复选框的 onCheckChangeListener，我想从邀请数组列表中删除对象。

但是对象没有从invitationArrayList 中删除。

适配器：

     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);
            }
        }
    }
}

这是一个活动的代码：

  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);
        }
    });

现在我正在更新 onSendInvites 列表，但是当我选中或取消选中 api 时，它的行为并不像预期的那样。

4

2 回答 2

1

OK, so there are few silly mistakes I say,

a. Replace 

final Contact contact = contactArrayList.get(position);

with

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

b. You are adding Object of Class Invitation 

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. You are trying to remove object of Class Contacts

else {
                    invitationArrayList.remove(contact);

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

Solution

in onBindViewHolder

   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()));
            }
        });

then make a method like

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

here contact.setSeletected(boolean status) and contact.isSelected() are setters and getters respectively

EDIT: Here is the link to my blog on RecyclerView which explains most of the concepts of Simple RecyclerView.

于 2016-10-04T13:05:30.793 回答
-1

instead of using object to remove use index to remove item:

   invitationArrayList.remove(position);

it will work.

You are getting index out of bound because there may be possibility user is removing the item before adding it. may be particular element in not present in your invitationArrayList. So for this try this code:

if (invitationArrayList!=null && invitationArrayList.size() > 0 && invitationArrayList.size() > position +1){
 invitationArrayList.remove(position);
}
于 2016-10-04T12:22:05.793 回答