Android 中自定义 Adapter

悠悠 2022-08-26 13:28 345阅读 0赞

public classMyListViewAdapter extends BaseAdapter {
       
        private Context mContext= null;
        private LayoutInflater mLayoutInflater= null;
        private List<Map<String, Object>> mList= null;
       
        //构造方法，参数list传递的就是这一组数据的信息
        public MyListViewAdapter(Context context, List<Map<String, Object>> list) {
           this.mList= list;
           this.mContext= context;
           this.mLayoutInflater= LayoutInflater.from(mContext);
        }
     
        //得到总的数量
        @Override
        public int getCount() {
           // TODOAuto-generated method stub
           return this.mList!= null? this.mList.size() : 0;
        }
     
        //根据位置得到View对象
        @Override
        public Object getItem(intposition) {
           // TODOAuto-generated method stub
           return this.mList.get(position);
        }
     
         //根据ListView位置得到List中的ID
        @Override
        public long getItemId(intposition) {
           // TODOAuto-generated method stub
           returnposition;
        }
     
        //根据位置得到View对象
        @Override
        public View getView(intposition, View convertView, ViewGroup parent) {
           // TODOAuto-generated method stub
           //得到条目中的子组件
           ViewHolder holder = null;
           if(convertView == null) {
               holder = newViewHolder();
               convertView = mLayoutInflater.inflate(R.layout.activity_main_item, null);
               holder.imageHead= (ImageView) convertView.findViewById(R.id.imageHead);
               holder.name= (TextView) convertView.findViewById(R.id.name);
               holder.time= (TextView) convertView.findViewById(R.id.time);
               holder.content= (TextView) convertView.findViewById(R.id.content);
               holder.imageContent= (ImageView) convertView.findViewById(R.id.imageContent);
               holder.transmit= (TextView) convertView.findViewById(R.id.transmit);
               holder.comment= (TextView) convertView.findViewById(R.id.comment);
               convertView.setTag(holder);
           } else{
               holder = (ViewHolder) convertView.getTag();
           }
          
           //对ListView的Item中的控件的操作
           holder.imageHead.setImageResource((Integer) mList.get(position).get("imageHead"));
           holder.name.setText(mList.get(position).get("name").toString());
           holder.time.setText(mList.get(position).get("time").toString());
           holder.content.setText(mList.get(position).get("content").toString());
           holder.imageContent.setImageResource((Integer) mList.get(position).get("imageContent"));
           holder.transmit.setText(mList.get(position).get("transmit").toString());
           holder.comment.setText(mList.get(position).get("comment").toString());
          
           return convertView;
        }
       
       // 定义一个内部类来管理条目中的子组件
        public final classViewHolder {
           public ImageView imageHead= null;
           public ImageView imageContent= null;
           public TextView time= null;
           public TextView name= null;
           public TextView content= null;
           public TextView comment= null;
           public TextView transmit= null;
        }
     
    }