小巫CSDN博客客户端之获取评论列表
最后更新于:2022-04-01 09:39:45
## Android应用开发-小巫CSDN博客客户端之获取评论列表
上一篇博客介绍了博文详细内容的业务逻辑实现,本篇博客介绍小巫CSDN博客客户端的最后一项功能,获取评论列表,这个功能的实现跟前面获取文章列表和文章详细的内容不一样,CSDN博客获取评论是通过js来请求服务器加载评论列表的,返回数据为json数据,我们这里要做的事情就是找到这样的一个js文件,再找到请求url的拼接字符串,然后根据我们的需求,请求文章的评论列表获取到当前文章的评论json数据,然后进行解析工作,最后展示到我们的界面当中。
如果没有仔细分析html代码的童鞋,可能发现不了这一点,小巫在开发这个客户端的时候,一时也获取不到评论列表,后来通过与CSDN技术的交流之后,我再仔细查看才找到了关于博客的请求方式,这里使用jsoup无法模拟javascript的加载,所以只能通过自己查看js代码,找到请求的url,下面笔者会告诉大家怎么来做这件事。
小巫这里找一篇有评论的博文,比如以下这篇:
[http://blog.csdn.net/wwj_748/article/details/39726051](http://blog.csdn.net/wwj_748/article/details/39726051)
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-02-24_56cd63d2a8a34.jpg)
我们可以看到这篇文章的底部是我们的文章评论列表,有别人评论的也有自己回复的。用同样的方式,F12查看源代码,或者查看元素定位到评论内容,如下所示:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-02-24_56cd63d2f1f2d.jpg)
这时我们点击进去查看相应的js文件,去看看能不能找到我们想要的东西:
哎呀,很不小心就被我发现了我想要的东西:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-02-24_56cd63d8c7122.jpg)
从上面我们可以分析出,获取文章的评论列表需要请求类似以下的地址:
"http://blog.csdn.net/wwj_748/comment/list/39726051?page=1,刚开始小巫并不知道这样的请求地址,是通过以上的方式才得知的。我们请求一篇文章需要知道对应文章的filename和pageIndex,然后以下面这种形式拼接:
~~~
/**
* 返回博文评论列表链接
*
* @param filename
* 文件名
* @param pageIndex
* 页数
* @return
*/
public static String getCommentListURL(String filename, String pageIndex) {
return "http://blog.csdn.net/wwj_748/comment/list/" + filename
+ "?page=" + pageIndex;
}
~~~
到了这一步基本上解决了最麻烦的事情,下面是业务逻辑的实现:
/BlogClient/src/com/xiaowu/blogclient/BlogCommentActivity.java
~~~
package com.xiaowu.blogclient;
import java.util.List;
import me.maxwin.view.IXListViewLoadMore;
import me.maxwin.view.IXListViewRefreshListener;
import me.maxwin.view.XListView;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.xiaowu.blogclient.adapter.CommentAdapter;
import com.xiaowu.blogclient.model.Comment;
import com.xiaowu.blogclient.model.Page;
import com.xiaowu.blogclient.util.Constants;
import com.xiaowu.blogclient.util.DateUtil;
import com.xiaowu.blogclient.util.HttpUtil;
import com.xiaowu.blogclient.util.JsoupUtil;
import com.xiaowu.blogclient.util.URLUtil;
/**
* 2014/8/13
*
* 博客评论列表
*
* @author wwj_748
*
*/
public class BlogCommentActivity extends Activity implements
IXListViewRefreshListener, IXListViewLoadMore {
private XListView listView;
private CommentAdapter adapter;
private ProgressBar progressBar;
private ImageView reLoadImageView;
private ImageView backBtn;
private TextView commentTV;
public static String commentCount = "";
private Page page;
private String filename;
private int pageIndex = 1;
private int pageSize = 20;
@Override
protected void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_NO_TITLE);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_comment);
init();
initComponent();
listView.setRefreshTime(DateUtil.getDate()); // 设置刷新时间
listView.startRefresh(); // 开始刷新
}
// 初始化
private void init() {
filename = getIntent().getExtras().getString("filename"); // 获得文件名
page = new Page();
adapter = new CommentAdapter(this);
}
// 初始化组件
private void initComponent() {
progressBar = (ProgressBar) findViewById(R.id.newsContentPro);
reLoadImageView = (ImageView) findViewById(R.id.reLoadImage);
reLoadImageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
System.out.println("click");
reLoadImageView.setVisibility(View.INVISIBLE);
progressBar.setVisibility(View.VISIBLE);
new MainTask().execute(Constants.DEF_TASK_TYPE.REFRESH);
}
});
backBtn = (ImageView) findViewById(R.id.backBtn);
backBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
commentTV = (TextView) findViewById(R.id.comment);
listView = (XListView) findViewById(R.id.listview);
listView.setAdapter(adapter);
listView.setPullRefreshEnable(this);
listView.setPullLoadEnable(this);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
}
});
}
@Override
public void finish() {
super.finish();
// 退出动画
overridePendingTransition(R.anim.push_no, R.anim.push_right_out);
}
private class MainTask extends AsyncTask<String, Void, Integer> {
@Override
protected Integer doInBackground(String... params) {
// 获得返回json字符串
String temp = HttpUtil.httpGet(URLUtil.getCommentListURL(filename,
page.getCurrentPage()));
if (temp == null) {
return Constants.DEF_RESULT_CODE.ERROR;
}
// 获得评论列表
List<Comment> list = JsoupUtil.getBlogCommentList(temp,
Integer.valueOf(page.getCurrentPage()), pageSize);
if (list.size() == 0) {
return Constants.DEF_RESULT_CODE.NO_DATA;
}
if (params[0].equals(Constants.DEF_TASK_TYPE.LOAD)) {
adapter.addList(list);
return Constants.DEF_RESULT_CODE.LOAD;
} else {
adapter.setList(list);
return Constants.DEF_RESULT_CODE.REFRESH;
}
}
@Override
protected void onPostExecute(Integer result) {
if (result == Constants.DEF_RESULT_CODE.ERROR) {
Toast.makeText(getApplicationContext(), "网络信号不佳",
Toast.LENGTH_SHORT).show();
listView.stopRefresh(DateUtil.getDate());
listView.stopLoadMore();
reLoadImageView.setVisibility(View.VISIBLE);
} else if (result == Constants.DEF_RESULT_CODE.NO_DATA) {
Toast.makeText(getApplicationContext(), "无更多评论",
Toast.LENGTH_SHORT).show();
listView.stopLoadMore();
listView.stopRefresh(DateUtil.getDate());
commentTV.setText("共有评论:" + commentCount);
} else if (result == Constants.DEF_RESULT_CODE.LOAD) {
page.addPage();
pageIndex++;
adapter.notifyDataSetChanged();
listView.stopLoadMore();
} else if (result == Constants.DEF_RESULT_CODE.REFRESH) {
adapter.notifyDataSetChanged();
listView.stopRefresh(DateUtil.getDate());
page.setPage(2);
commentTV.setText("共有评论:" + commentCount); // 显示评论数
}
progressBar.setVisibility(View.INVISIBLE);
super.onPostExecute(result);
}
}
// 加载更多
@Override
public void onLoadMore() {
new MainTask().execute(Constants.DEF_TASK_TYPE.LOAD);
}
// 刷新评论
@Override
public void onRefresh() {
page.setPage(1);
new MainTask().execute(Constants.DEF_TASK_TYPE.REFRESH);
}
}
~~~
/BlogClient/src/com/xiaowu/blogclient/adapter/CommentAdapter.java
~~~
package com.xiaowu.blogclient.adapter;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.graphics.Bitmap;
import android.text.Html;
import android.text.SpannableStringBuilder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import com.xiaowu.blogclient.R;
import com.xiaowu.blogclient.model.Comment;
import com.xiaowu.blogclient.util.Constants;
/**
* 评论列表适配器
*
* @author wwj_748
*
*/
public class CommentAdapter extends BaseAdapter {
private ViewHolder holder;
private LayoutInflater layoutInflater;
private Context context;
private List<Comment> list;
private SpannableStringBuilder htmlSpannable;
private ImageLoader imageLoader = ImageLoader.getInstance();
private DisplayImageOptions options;
private String replyText;
public CommentAdapter(Context c) {
super();
layoutInflater = (LayoutInflater) LayoutInflater.from(c);
list = new ArrayList<Comment>();
imageLoader.init(ImageLoaderConfiguration.createDefault(c));
options = new DisplayImageOptions.Builder()
.showStubImage(R.drawable.csdn)
.showImageForEmptyUri(R.drawable.csdn)
.showImageOnFail(R.drawable.csdn)
.cacheInMemory().cacheOnDisc()
.imageScaleType(ImageScaleType.EXACTLY)
.bitmapConfig(Bitmap.Config.RGB_565)
.displayer(new FadeInBitmapDisplayer(300)).build();
}
public void setList(List<Comment> list) {
this.list = list;
}
public void addList(List<Comment> list) {
this.list.addAll(list);
}
public void clearList() {
this.list.clear();
}
public List<Comment> getList() {
return list;
}
public void removeItem(int position) {
if (list.size() > 0) {
list.remove(position);
}
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Comment item = list.get(position); // 获取评论项
if (null == convertView) {
holder = new ViewHolder();
switch (item.getType()) {
case Constants.DEF_COMMENT_TYPE.PARENT: // 父项
convertView = layoutInflater.inflate(R.layout.comment_item,
null);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.content = (TextView) convertView
.findViewById(R.id.content);
holder.date = (TextView) convertView.findViewById(R.id.date);
holder.reply = (TextView) convertView
.findViewById(R.id.replyCount);
holder.userface = (ImageView) convertView.findViewById(R.id.userface);
break;
case Constants.DEF_COMMENT_TYPE.CHILD: // 子项
convertView = layoutInflater.inflate(
R.layout.comment_child_item, null);
holder.name = (TextView) convertView.findViewById(R.id.name);
holder.content = (TextView) convertView
.findViewById(R.id.content);
holder.date = (TextView) convertView.findViewById(R.id.date);
break;
}
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if (null != item) {
switch (item.getType()) {
case Constants.DEF_COMMENT_TYPE.PARENT: // 主题项
holder.name.setText(item.getUsername());
holder.content.setText(Html.fromHtml(item.getContent())); // 显示评论内容
holder.date.setText(item.getPostTime());
// holder.reply.setText(item.getReplyCount());
imageLoader.displayImage(item.getUserface(), holder.userface, options);// 显示头像
break;
case Constants.DEF_COMMENT_TYPE.CHILD: // 回复项
holder.name.setText(item.getUsername());
replyText = item.getContent().replace("[reply]", "【");
replyText = replyText.replace("[/reply]", "】");
holder.content.setText(Html.fromHtml(replyText));
holder.date.setText(item.getPostTime());
break;
default:
break;
}
}
return convertView;
}
@Override
public int getViewTypeCount() {
return 2;
}
@Override
public int getItemViewType(int position) {
switch (list.get(position).getType()) {
case Constants.DEF_COMMENT_TYPE.PARENT: // 父节点
return 0;
case Constants.DEF_COMMENT_TYPE.CHILD: // 子节点
return 1;
}
return 1;
}
@Override
public boolean isEnabled(int position) {
return true;
}
private class ViewHolder {
TextView id;
TextView date;
TextView name;
TextView content;
ImageView userface;
TextView reply;
}
}
~~~
最终效果图如下:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-02-24_56cd63d93b627.jpg)
最后:
关于小巫CSDN博客客户端的开发基本上都介绍完了,更多详细的实现请到以下链接下载源码查看:
[http://download.csdn.net/detail/wwj_748/7912513](http://download.csdn.net/detail/wwj_748/7912513)