ListView实现点赞功能并用okHttp更新点赞数量

主类：
1，继承OnItemClickListener
2，listview实现监听器：

listView.setOnItemClickListener(this);

@Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(attention_main.this, "listview的item被点击了！，点击的位置是-->" + position,
                Toast.LENGTH_SHORT).show();
    }

3，

自定义适配器：
1，继承BaseAdapter
2，重写方法：
//私有成员

 private LinkedList<Attention_listBean> aData;
 private Context mContext;

//构造器

public Attention_listAdapter(LinkedList<Attention_listBean> aData, Context mContext) {
    this.aData = aData;
    this.mContext = mContext;
    }

//重写的方法

 @Override
public int getCount() {
    return aData.size();
}
@Override
public Object getItem(int position) {
    return null;
}

@Override
public long getItemId(int position) {
    return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {

	    //设置item项的值
	    ViewHolder holder = null;
        if (convertView == null) {
        //获取item项的组件
            convertView = LayoutInflater.from(mContext).inflate(R.layout.layout_attention_main, parent, false);
            holder = new ViewHolder();
            holder.user_name = (TextView) convertView.findViewById(R.id.user_name);
            holder.user_pic = (ImageView) convertView.findViewById(R.id.user_pic);
            holder.create_time = (TextView) convertView.findViewById(R.id.create_time);
            holder.content_text = (TextView) convertView.findViewById(R.id.content_text);
            holder.place_name = (TextView) convertView.findViewById(R.id.place_name);
            holder.comment_num = (TextView) convertView.findViewById(R.id.comment_num);
            holder.like_num = (TextView) convertView.findViewById(R.id.like_num);
            holder.like = (ImageButton)convertView.findViewById(R.id.like);
            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();

        }

        //设置item项组件的值
        holder.user_name.setText(aData.get(position).getUser_name());
        Glide.with(mContext).load(aData.get(position).getUser_pic()).into(holder.user_pic);
        holder.create_time.setText(aData.get(position).getCreate_time());
        holder.content_text.setText(aData.get(position).getContent_text());
        holder.place_name.setText(aData.get(position).getPlace_name());
        holder.comment_num.setText(aData.get(position).getComment_num());
        holder.like_num.setText(aData.get(position).getLike_num());
        holder.like.setOnClickListener(new MyClickListener(position,convertView));//点赞实现监听器类
        holder.like.setTag(position);
        holder.like_num.setTag(position);

        return convertView;
    }

//定义ViewHolder类

static class ViewHolder{
            TextView user_name;
            ImageView user_pic;
            TextView create_time;
            TextView content_text;
            TextView place_name;
            TextView comment_num;
            TextView like_num;
            ImageButton like;
        }

//实现监听器类

    public class MyClickListener implements OnClickListener {
    private int position;
    private View convertView;
    ImageButton like;
    TextView likes_num;
    //改造方法，获取position和convertView
    public MyClickListener(int position,View convertView) {
        this.position = position;
        this.convertView = convertView;
    }

    /**
     * 基类的onClick方法
     */
    @Override
    public void onClick(View v) {
    //通过convertView获取组件id
        likes_num =(TextView)convertView.findViewById(R.id.like_num);
        like = (ImageButton)v;
        //通过position获取组件值
        note_id = aData.get(position).getNotes_id();


        //使用handler实现消息传递，由于OkHttp回调不能在子线程更新UI
        final Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                switch (msg.what){
                    case 1:
                        String like = msg.getData().getString("like");
                        likes_num.setText(like);
                        break;
                    case 2:
                        String not_like = msg.getData().getString("not_like");
                        likes_num.setText(not_like);
                        break;
                }
            }
        };




        if(v.getId() == like.getId()) {
            if (aData.get(position).getLike_TF().equals("0")) { //判断是否点击，0为未点击

                like.setBackground(convertView.getResources().getDrawable(R.drawable.choose_like));//更新点赞图片
                //使用Okhttp获取点赞数量，消息传递到handler
                OkHttpClient okHttpClient = new OkHttpClient();
                //2.创建Request对象，设置一个url地址,设置请求方式。
                Request request = new Request.Builder()
                        .url("http://192.168.43.243:9000/like/" + note_id)
                        .get()
                        .build();

                //3.创建一个call对象,参数就是Request请求对象
                Call call = okHttpClient.newCall(request);
                call.enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        String err = e.getMessage().toString();
                        System.out.println("----------------------------sbsbsbs+err" + err);
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        String rtn = response.body().string();
                        System.out.println("----------------------------sbsbsbs+success" + rtn);

                        Message message = new Message();
                        message.what = 1;
                        //携带参数
                        Bundle bundle = new Bundle();
                        bundle.putString("like",rtn);
                        message.setData(bundle);
                        handler.sendMessage(message);


                    }
                });
                aData.get(position).setLike_TF("1");
            }else {


                like.setBackground(convertView.getResources().getDrawable(R.drawable.dz));

                OkHttpClient okHttpClient = new OkHttpClient();
                //2.创建Request对象，设置一个url地址,设置请求方式。
                Request request = new Request.Builder()
                        .url("http://192.168.43.243:9000/dont_like/" + note_id)
                        .get()
                        .build();

                //3.创建一个call对象,参数就是Request请求对象
                Call call = okHttpClient.newCall(request);
                call.enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        String err = e.getMessage().toString();
                        System.out.println("----------------------------sbsbsbs+err" + err);
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        String rtn = response.body().string();
                        System.out.println("----------------------------sbsbsbs+success" + rtn);

                        Message message = new Message();
                        message.what = 2;
                        Bundle bundle = new Bundle();
                        bundle.putString("not_like",rtn);
                        message.setData(bundle);
                        handler.sendMessage(message);
                    }
                });

                aData.get(position).setLike_TF("0");

            }
        }


    }

}