how can i delete messages from listview using checkbox without database from two different activities?

hey I want to delete messages from my listView using checkbox but iam unable because my delete button is in main activity and checkbox is in another activity as i have shown below...can anyone kindly help me out....!!!!

import java.util.ArrayList;
import java.util.List;

 import com.PlumCitizenSMS.R;


import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.sax.StartElementListener;
   import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.TextView;
import android.widget.Toast;



public class ListAdapter extends BaseAdapter {
TextView smsMsg;
private LayoutInflater mLayoutInflater; 
Context mContext;
Button del;
Plum1 plum;
Sms sms;
CheckBox isCheck;
// Can make custom Util class for user answer info
private List<Sms> mEntries = new ArrayList<Sms>();
public ListAdapter(Context context, LayoutInflater inflater,Plum1 plum) {
    mLayoutInflater = (LayoutInflater) inflater;
    this.plum=plum;
    mContext = context;
  }
  @Override
  public int getCount() {
    return mEntries.size();
}
@Override
public Object getItem(int position) {
    return mEntries.get(position);
}
 @Override
public long getItemId(int position) {
    return position;
}
 @Override
public View getView(final int position, View convertView, final ViewGroup      parent) {
    if(convertView == null){
  convertView =  mLayoutInflater.inflate(R.layout.sms_layout, parent, false);
    }
    smsMsg = (TextView)convertView.findViewById(R.id.textViewForSMS);
    isCheck = (CheckBox)convertView.findViewById(R.id.checkBox1);
   // isCheck.setVisibility(View.VISIBLE);
    smsMsg.setOnLongClickListener(new OnLongClickListener() {
        @Override
        public boolean onLongClick(View arg0) {
            // TODO Auto-generated method stub
Toast.makeText(mContext, "long clicked", Toast.LENGTH_LONG).show();
            //isCheck.setVisibility(View.INVISIBLE);
            return false;
        }
    });
     final Sms sms=mEntries.get(position);
     smsMsg.setText(sms.getAddress()+" :\n  "+sms.getMsg());
     smsMsg.setOnClickListener(new View.OnClickListener() {
    @Override
      public void onClick(View v) {
          // TODO Auto-generated method stub
          plum.ShowSendMsgLayout(sms.getMsg().split(":")[0]);
  }
    });
smsMsg.setOnLongClickListener(new OnLongClickListener() {
    @Override
        public boolean onLongClick(View arg0) {
            // TODO Auto-generated method stub
Toast.makeText(mContext, "deleted successfully", Toast.LENGTH_LONG).show();
            return false;
            }   
        });
return convertView;
}

public void upDateEntries(List<Sms> entries) {
   mEntries.clear();
   for(Sms sms : entries){
       if(sms.getAddress().contains("PLUMSF")){
           mEntries.add(sms);
       }
   }
   notifyDataSetChanged();
     }
 }