Android學習筆記之viewholder

標籤：

在adapter中通過使用靜態內部類（viewholder）緩衝組件的引用來防止ListView重新整理時重新LayoutInflater跟findViewById從而達到最佳化的目的。樣本如下：

 

 

@Override    public View getView(final int position, View convertView, ViewGroup parent) {        ViewHolder viewHolder = null;        if(convertView == null) {            convertView = LayoutInflater.from(context).inflate(R.layout.menu_item_layout, null);            viewHolder = new ViewHolder();            viewHolder.btn_menu = (Button) convertView.findViewById(R.id.btn_menu);            viewHolder.tv_title = (TextView)convertView.findViewById(R.id.tv_title);            convertView.setTag(viewHolder);        } else {            viewHolder = (ViewHolder)convertView.getTag();        }        final int[] d= data.get(position);        viewHolder.btn_menu.setBackgroundResource(d[0]);        viewHolder.btn_menu.setFocusable(false);        viewHolder.btn_menu.setFocusableInTouchMode(false);        viewHolder.tv_title.setText(d[1]);        viewHolder.tv_title.setTextSize(12);        viewHolder.tv_title.setTextColor(Color.WHITE);        final View t_View = convertView;        viewHolder.btn_menu.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                if(mItemListener != null) {                    mItemListener.onClickListener(position, t_View);                }            }        });                return convertView;    }        public static class ViewHolder {        public Button btn_menu;        public TextView tv_title;    }

 

Android學習筆記之viewholder