Android Open Source - HNdroid Comments

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License

The source code is released under:

This is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a co...

Java Source Code

package com.gluegadget.hndroid;
/*from  ww w. ja va  2  s.c o  m*/
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.htmlcleaner.HtmlCleaner;
import org.htmlcleaner.TagNode;
import org.htmlcleaner.XPatherException;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.MenuItem.OnMenuItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.AdapterContextMenuInfo;

public class Comments extends Activity {
  
  static final private int MENU_UPDATE = Menu.FIRST;
  static final private int MENU_COMMENT = Menu.FIRST + 1;
  
  static final private int NOTIFY_DATASET_CHANGED = 1;
  static final private int NOTIFY_COMMENT_ADDED = 2;
  
  static final private int CONTEXT_REPLY = 1;
  static final private int CONTEXT_UPVOTE = 2;
  
  ProgressDialog dialog;
  
  ListView newsListView;
  
  CommentsAdapter aa;
  
  ArrayList<Comment> commentsList = new ArrayList<Comment>();
  
  String extrasCommentsUrl;
  
  String fnId = "";
  
  Boolean loggedIn = false;
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        newsListView = (ListView)this.findViewById(R.id.hnListView);
        registerForContextMenu(newsListView);
        int layoutID = R.layout.comments_list_item;
        aa = new CommentsAdapter(this, layoutID , commentsList);
        newsListView.setAdapter(aa);
        
      final Bundle extras = getIntent().getExtras();
      extrasCommentsUrl = extras.getString("url");
      TextView hnTopDesc = (TextView)this.findViewById(R.id.hnTopDesc);
      hnTopDesc.setText(extras.getString("title"));
      dialog = ProgressDialog.show(Comments.this, "", "Loading. Please wait...", true);
      new Thread(new Runnable(){
        public void run() {
          refreshComments(extrasCommentsUrl);
          dialog.dismiss();
          handler.sendEmptyMessage(NOTIFY_DATASET_CHANGED);
        }
      }).start();
        
    }
    
    Handler handler = new Handler(){
      @Override
      public void handleMessage(Message msg) {
        switch(msg.what) {
        case NOTIFY_DATASET_CHANGED:
          aa.notifyDataSetChanged();
          break;
        case NOTIFY_COMMENT_ADDED:
          dialog = ProgressDialog.show(Comments.this, "", "Reloading. Please wait...", true);
            new Thread(new Runnable(){
              public void run() {
                refreshComments(extrasCommentsUrl);
                dialog.dismiss();
                handler.sendEmptyMessage(NOTIFY_DATASET_CHANGED);
              }
            }).start();
          break;
        default:
          break;
        }
      }
    };
    
    private class OnCommentListener implements CommentDialog.ReadyListener {
      @Override
      public void ready(final String text) {
        try {
          dialog = ProgressDialog.show(Comments.this, "", "Trying to comment. Please wait...", true);
          new Thread(new Runnable(){
            public void run() {
              try {
                DefaultHttpClient httpclient = new DefaultHttpClient();
                HttpPost httpost = new HttpPost("http://news.ycombinator.com/r");
                List <NameValuePair> nvps = new ArrayList <NameValuePair>();
                nvps.add(new BasicNameValuePair("text", text));
                nvps.add(new BasicNameValuePair("fnid", fnId));
                httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
                SharedPreferences settings = getSharedPreferences(Main.PREFS_NAME, 0);
                  String cookie = settings.getString("cookie", "");
                  httpost.addHeader("Cookie", "user=" + cookie);
                httpclient.execute(httpost);
                httpclient.getConnectionManager().shutdown();
                dialog.dismiss();
                handler.sendEmptyMessage(NOTIFY_COMMENT_ADDED);
              } catch (Exception e) {
                dialog.dismiss();
                handler.sendEmptyMessage(0);
                e.printStackTrace();
              }
            }
          }).start();
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
      public void ready(final String text, String url) {}
    }
    
    private class OnReplyListener implements CommentDialog.ReadyListener {
      @Override
      public void ready(final String text, final String replyUrl) {
        try {
          dialog = ProgressDialog.show(Comments.this, "", "Trying to reply. Please wait...", true);
          new Thread(new Runnable(){
            public void run() {
              try {
                DefaultHttpClient httpclient = new DefaultHttpClient();
                SharedPreferences settings = getSharedPreferences(Main.PREFS_NAME, 0);
                  String cookie = settings.getString("cookie", "");
                HttpGet httpget = new HttpGet(replyUrl);
                  httpget.addHeader("Cookie", "user=" + cookie);
                  ResponseHandler<String> responseHandler = new BasicResponseHandler();
                  String responseBody = httpclient.execute(httpget, responseHandler);
                  HtmlCleaner cleaner = new HtmlCleaner();
                  TagNode node = cleaner.clean(responseBody);
                  Object[] forms = node.evaluateXPath("//form[@method='post']/input[@name='fnid']");
                  if (forms.length == 1) {
                    TagNode formNode = (TagNode)forms[0];
                    String replyToFnId = formNode.getAttributeByName("value").toString().trim();
                    HttpPost httpost = new HttpPost("http://news.ycombinator.com/r");
                    List <NameValuePair> nvps = new ArrayList <NameValuePair>();
                    nvps.add(new BasicNameValuePair("text", text));
                    nvps.add(new BasicNameValuePair("fnid", replyToFnId));
                    httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
                      httpost.addHeader("Cookie", "user=" + cookie);
                    httpclient.execute(httpost);
                    httpclient.getConnectionManager().shutdown();
                  }
                dialog.dismiss();
                handler.sendEmptyMessage(NOTIFY_COMMENT_ADDED);
              } catch (Exception e) {
                dialog.dismiss();
                handler.sendEmptyMessage(0);
                e.printStackTrace();
              }
            }
          }).start();
        } catch (Exception e) {
          e.printStackTrace();
        }
      }
      public void ready(final String text) {}
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
      super.onCreateOptionsMenu(menu);

      MenuItem itemRefresh = menu.add(0, MENU_UPDATE, Menu.NONE, R.string.menu_refresh);
      itemRefresh.setIcon(R.drawable.ic_menu_refresh);
      itemRefresh.setOnMenuItemClickListener(new OnMenuItemClickListener() {
        public boolean onMenuItemClick(MenuItem item) {
          try {
            dialog = ProgressDialog.show(Comments.this, "", "Reloading. Please wait...", true);
            new Thread(new Runnable(){
              public void run() {
                refreshComments(extrasCommentsUrl);
                dialog.dismiss();
                handler.sendEmptyMessage(NOTIFY_DATASET_CHANGED);
              }
            }).start();
          } catch (Exception e) {
            e.printStackTrace();
          }
          return true;
        }
      });

      MenuItem itemComment = menu.add(0, MENU_COMMENT, Menu.NONE, R.string.menu_comment);
      itemComment.setIcon(R.drawable.ic_menu_compose);
      itemComment.setOnMenuItemClickListener(new OnMenuItemClickListener() {
        @Override
        public boolean onMenuItemClick(MenuItem item) {
          CommentDialog commentDialog = new CommentDialog(Comments.this, "Comment on submission", new OnCommentListener());
          commentDialog.show();

          return true;
        }
      });

      return true;
    }
    
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
      if (!loggedIn || fnId == "") {
        menu.findItem(MENU_COMMENT).setVisible(false);
        menu.findItem(MENU_COMMENT).setEnabled(false);
      }
      
      return super.onPrepareOptionsMenu(menu); 
    }
    
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
      super.onCreateContextMenu(menu, v, menuInfo);
      
      AdapterContextMenuInfo info = (AdapterContextMenuInfo)menuInfo;
      final Comment newsContexted = (Comment) newsListView.getAdapter().getItem(info.position);
      
      menu.setHeaderTitle(newsContexted.getTitle());   
      if (fnId != "" && newsContexted.getReplyToUrl() != "" && loggedIn) {
        MenuItem originalLink = menu.add(0, CONTEXT_REPLY, 0, R.string.context_reply); 
        originalLink.setOnMenuItemClickListener(new OnMenuItemClickListener() {    
          public boolean onMenuItemClick(MenuItem item) {
            CommentDialog commentDialog = new CommentDialog(
                Comments.this, "Reply to " + newsContexted.getAuthor(),
                newsContexted.getReplyToUrl(), new OnReplyListener()
            );
            commentDialog.show();

            return true;
          }
        });
      }
      
      if (newsContexted.getUpVoteUrl() != "" && loggedIn) {
        MenuItem upVote = menu.add(0, CONTEXT_UPVOTE, 0, R.string.context_upvote);
          upVote.setOnMenuItemClickListener(new OnMenuItemClickListener() {    
            public boolean onMenuItemClick(MenuItem item) {
              dialog = ProgressDialog.show(Comments.this, "", "Voting. Please wait...", true);
            new Thread(new Runnable(){
              public void run() {
                SharedPreferences settings = getSharedPreferences(Main.PREFS_NAME, 0);
                  String cookie = settings.getString("cookie", "");
                  DefaultHttpClient httpclient = new DefaultHttpClient();
                  HttpGet httpget = new HttpGet(newsContexted.getUpVoteUrl());
                  httpget.addHeader("Cookie", "user=" + cookie);
                  ResponseHandler<String> responseHandler = new BasicResponseHandler();
                  try {
                httpclient.execute(httpget, responseHandler);
              } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
              }
                dialog.dismiss();
                handler.sendEmptyMessage(NOTIFY_COMMENT_ADDED);
              }
            }).start();
              return true;
            }
          });
      }
    }
    
    private void refreshComments(String uri) {
      try {
        commentsList.clear();
        SharedPreferences settings = getSharedPreferences(Main.PREFS_NAME, 0);
        String cookie = settings.getString("cookie", "");
        DefaultHttpClient httpclient = new DefaultHttpClient();
        HttpGet httpget = new HttpGet(uri);
        if (cookie != "")
          httpget.addHeader("Cookie", "user=" + cookie);
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseBody = httpclient.execute(httpget, responseHandler);
        HtmlCleaner cleaner = new HtmlCleaner();
        TagNode node = cleaner.clean(responseBody);

        Object[] loginFnid = node.evaluateXPath("//span[@class='pagetop']/a");
        TagNode loginNode = (TagNode) loginFnid[5];
        if (loginNode.getAttributeByName("href").toString().trim().equalsIgnoreCase("submit"))
          loggedIn = true;
        Object[] forms = node.evaluateXPath("//form[@method='post']/input[@name='fnid']");
        if (forms.length == 1) {
          TagNode formNode = (TagNode)forms[0];
          fnId = formNode.getAttributeByName("value").toString().trim();  
        }
        Object[] comments = node.evaluateXPath("//table[@border='0']/tbody/tr/td/img[@src='http://ycombinator.com/images/s.gif']");

        if (comments.length > 1) {
          for (int i = 0; i < comments.length; i++) {
            TagNode commentNode = (TagNode)comments[i];
            String depth = commentNode.getAttributeByName("width").toString().trim();
            Integer depthValue = Integer.parseInt(depth) / 2;
            TagNode nodeParent = commentNode.getParent().getParent();
            Object[] comment = nodeParent.evaluateXPath("//span[@class='comment']");
            Comment commentEntry;
            if (comment.length > 0) {
              TagNode commentSpan = (TagNode) comment[0];
              StringBuffer commentText = commentSpan.getText();
              if (!commentText.toString().equalsIgnoreCase("[deleted]")) {
                Object[] author = nodeParent.evaluateXPath("//span[@class='comhead']/a[1]");
                Object[] replyTo = nodeParent.evaluateXPath("//p/font[@size='1']/u/a");
                Object[] upVotes = nodeParent.getParent().evaluateXPath("//td[@valign='top']/center/a[1]");

                TagNode authorNode = (TagNode) author[0];

                String upVoteUrl = "";
                String replyToValue = "";
                String authorValue = authorNode.getChildren().iterator().next().toString().trim();
                if (upVotes.length > 0) {
                  TagNode upVote = (TagNode) upVotes[0];
                  upVoteUrl = upVote.getAttributeByName("href").toString().trim();
                }
                if (replyTo.length > 0) {
                  TagNode replyToNode = (TagNode) replyTo[0];
                  replyToValue = replyToNode.getAttributeByName("href").toString().trim();
                }

                            TagNode font = commentSpan.findElementByName("font", true);
                            String commentBody = font.getText().toString();

                            TagNode[] ps = commentSpan.getElementsByName("p", true);

                            for (TagNode p : ps) {
                                commentBody += "\n\n" + Html.fromHtml(p.getText().toString()).toString();
                            }

                commentEntry = new Comment(commentBody, authorValue, depthValue, replyToValue, upVoteUrl);
              } else {
                commentEntry = new Comment("[deleted]");
              }
              commentsList.add(commentEntry);
            }
          }
        } else {
          Comment commentEntry = new Comment("No comments.");
          commentsList.add(commentEntry);
        }
      } catch (MalformedURLException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      } catch (XPatherException e) {
        e.printStackTrace();
      } catch (IllegalStateException e) {
        finish();
      } finally {

      }
    }
}

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