Androd listView之BaseAdapter的基本使用模式

 private class BussinessDetailAdapter extends BaseAdapter{
        private Context ct;
        private ArrayList<Business> mdata=new ArrayList<>();
        private LayoutInflater inflater;
        public void BusinessDetailAdapter(Context ct,ArrayList<Business> data){
            this.ct=ct;
            this.mdata=data;
            this.inflater= LayoutInflater.from(ct);
        }

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

        @Override
        public Object getItem(int position) {
            return mdata.get(position);
        }

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

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            ViewHolder holder=null;
           if (convertView==null){
               convertView= inflater.inflate(R.layout.item_business_detail,null);
               holder = new ViewHolder();
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (TextView) convertView.findViewById(R.id.tv_crm_business_num);
               holder.tv_num= (Button) convertView.findViewById(R.id.bt_business_qiang);
               convertView.setTag(convertView);
           }else{
              holder= (ViewHolder) convertView.getTag();
           }
            holder.tv_num.setText(mdata.get(position).getNum());
            holder.tv_name.setText(mdata.get(position).getName());
            holder.tv_date.setText(mdata.get(position).getDate());
            holder.tv_datetv.setText("");
            holder.tv_leader.setText(mdata.get(position).getLeader());
            holder.tv_note.setText(mdata.get(position).getNote());
            holder.tv_phone.setText(mdata.get(position).getPhone());
            holder.tv_source.setText(mdata.get(position).getSource());
            if (mdata.get(position).getType()==0){
                holder.bt_event.setVisibility(View.GONE);
            }else if (mdata.get(position).getType()==1){
                holder.bt_event.setVisibility(View.VISIBLE);
                holder.bt_event.setText("抢");
            }else if(mdata.get(position).getType()==2){
                holder.bt_event.setVisibility(View.VISIBLE);
                holder.bt_event.setText("分配");
            }
            holder.bt_event.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (mdata.get(position).getType()==1){
     
                    }else if(mdata.get(position).getType()==2){
              
                    }
                }
            });
            return convertView;
        }


        class ViewHolder{
            TextView tv_num;
            TextView tv_name;
            TextView tv_leader;
            TextView tv_source;
            TextView tv_phone;
            TextView tv_note;
            TextView tv_datetv;
            TextView tv_date;
            Button bt_event;
        }
    }