问从自定义listView安卓系统中的项目更新textView

EN

    public EfficientAdapter(Context context) {
        mInflater = LayoutInflater.from(context);
        myContext = context;
    }

    public int getCount() {
        return nameList.length;
    }

    public Object getItem(int position) {
        return position;
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(final int position, View convertView,
            ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.travelpassengers_item,
                    null);
            holder = new ViewHolder();              
            holder.ratingTv = (TextView) convertView
                    .findViewById(R.id.tvTPRating);             

            holder.rateBtn = (Button) convertView
                    .findViewById(R.id.btnTPRate);
            holder.plusBtn = (Button) convertView
                    .findViewById(R.id.btnPlus);
            holder.minusBtn = (Button) convertView
                    .findViewById(R.id.btnMinus);
            holder.rateEt = (EditText) convertView
                    .findViewById(R.id.etTPRating); 
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        holder.ratingTv.setText(rating[position] + "/10");

        holder.callBtn.setTag(phoneList[position]);

        holder.ratingBtn.setTag(ids[position]);
        holder.ratingDisableBtn.setTag(numberRates[position]);
        holder.ratingTv.setTag(rating[position]);
        holder.rateEt.setTag(position);         

        holder.rateBtn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub                  
                        String id = holder.ratingBtn.getTag().toString();
                        int position = Integer.parseInt(holder.rateEt
                                .getTag().toString());
                        double oldRate = Double
                                .parseDouble(rating[position]);
                        int number = numberRates[position];
                        double newRate = Double.parseDouble(holder.rateEt
                                .getText().toString());

                        DecimalFormat oneDigit = new DecimalFormat(
                                "#,##0.0");
                        number++;
                        double avg = (oldRate + newRate) / number;
                        newRate = Double.valueOf(oneDigit.format(avg));
                    // I want to put the value from newRate in the holder.ratingTv on right position without updating entire listView.                  

                }
            }
        });

        holder.plusBtn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                int rate = Integer.parseInt(holder.rateEt.getText()
                        .toString());
                if (rate < 10) {
                    rate++;     
            holder.rateEt.setText(Integer.toString(rate));
                }
            }
        });

        holder.minusBtn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                int rate = Integer.parseInt(holder.rateEt.getText()
                        .toString());
                if (rate > 0) {
                    rate--;         
        holder.rateEt.setText(Integer.toString(rate));
                }
            }
        });

        return convertView;
    }

    static class ViewHolder {           
        public TextView  ratingTv;      
        public Button minusBtn, plusBtn;
        public EditText rateEt;
        public Button rateBtn;          
    }
}