当我滚动列表时，我的编辑文本值会在android上删除吗？

Question

 @Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final ViewHolder viewHolder;
    final Item item = getItem(position);

    View view = null;
    convertView = null;

                if (convertView == null) {
                    convertView = LayoutInflater.from(getContext()).inflate(R.layout.godown_list_iemname_activity, parent, false);

                    viewHolder = new ViewHolder();
                    viewHolder.text = (TextView) convertView
                            .findViewById(R.id.list_label_name);
                    viewHolder.edit = (EditText) convertView
                            .findViewById(R.id.qty_editText);
                    viewHolder.text_id = (TextView) convertView
                            .findViewById(R.id.list_label_qty);
                    convertView.setTag(viewHolder);
                } else {
                    viewHolder = (ViewHolder) convertView.getTag();
                }

                // Populate the data into the template view using the data object
                viewHolder.text.setText(itemlist.get(position).getId());
                viewHolder.edit.setText(itemlist.get(position).getQty());
                viewHolder.text_id.setText(itemlist.get(position).getItemcode());


                viewHolder.edit.addTextChangedListener(new TextWatcher() {
                    @Override
                    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                    }

                    @Override
                    public void onTextChanged(CharSequence s, int start, int before, int count) {
                        sb = new StringBuilder(s.length());
                        sb.append(s);


                        viewHolder.edit.setTextColor(Color.RED);
                        String ts =String.valueOf(viewHolder.text.getText()) +"_"+sb.toString();
                        value.add(ts);
                        System.out.println("array list size1"+value.size());
                        System.out.println("array list size1"+value);

                        SharedPreferences pref = getContext().getSharedPreferences("MyPref", MODE_PRIVATE);
                        SharedPreferences.Editor editor = pref.edit();
                        editor.putString("Value", String.valueOf(value));
                        editor.clear();
                        editor.commit();

                    }

                    @Override
                    public void afterTextChanged(Editable s) {

                    }
                });
                value.clear();
                System.out.println("array list size"+ value);

                return convertView;


            }

当我滚动列表时，我的编辑文本值被删除..实际上我从数据库中获取所有值，如果我想更改编辑文本值，在我滚动列表后，我的更改值被删除....我尝试了很多方法....我得到任何答案....如果有人知道，你能解决我的问题...我想将我编辑的值存储在单独的数组中，并在按下更新按钮时再次发送到后端。 ....