ListView适配器的简单用法，优化

    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return blacknamebins.size();
        }

        @Override
        public Object getItem(int i) {
            //这个是返回当前选择条目内容
            return blacknamebins.get(i);
        }

        @Override
        public long getItemId(int i) {
            //这个是返回当前选择条目的索引值
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {

            //返回一个条目所对应的View对象 (第三个参数为是否要挂在到父控件上 一般传入null)
            View BlacknameView = View.inflate(Blackname_Activity.this, R.layout.listview_blackname, null);
            //找到控件
            tv_listView_blackname_phone = (TextView) BlacknameView.findViewById(R.id.tv_ListView_Blackname_Phone);
            tv_listView_blackname_mode = (TextView) BlacknameView.findViewById(R.id.tv_ListView_Blackname_mode);
            iv_blackname_del = (ImageView) BlacknameView.findViewById(R.id.iv_Blackname_del);
            
            return BlacknameView;
        }
    }

优化：1：ConvertView的复用
2：findViewById()的复用

1：ConvertView的复用

 if (view==null){
           //返回一个条目所对应的View对象 (第三个参数为是否要挂在到父控件上 一般传入null)
           view = View.inflate(Blackname_Activity.this, R.layout.listview_blackname, null);
}

2:findViewById()的复用
1:创建一个静态的ViewHolder类
里面创建你在ListView每个条目中想要找到的控件的名称

    static class ViewHolder{
        TextView tv_listView_blackname_phone;
        TextView tv_listView_blackname_mode;
        ImageView iv_blackname_del;
    }

2：生成ViewHolder的对象

 ViewHolder viewHolder = new ViewHolder();

3:如果是第一次

完整的

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder = new ViewHolder();
            if (convertView==null){
                convertView = View.inflate(MainActivity.this, R.layout.item, null);
                viewHolder.textView= (TextView)convertView.findViewById(R.id.te);
                convertView.setTag(viewHolder);
            }else {
                viewHolder = (ViewHolder) convertView.getTag();
            }

            viewHolder.textView.setText(object[position]);
            return convertView;
        }
    }

    static class ViewHolder{
        TextView textView;
    }