Android Open Source - EdXVideoViewer Courseware Section Viewer

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From Project

Back to project page EdXVideoViewer.

License

The source code is released under:

MIT License

Java Source Code

package com.github.krooken.edxvideoviewer;
/*  ww  w. j a va2  s  . c o  m*/
import java.io.IOException;
import java.io.StringReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class CoursewareSectionViewer extends Activity {

  private ArrayAdapter<String> adapter;
  private String cookieData;
  
  private static final String TAG = "CoursewareSectionViewer";
  
  private String[] videoTexts = new String[0];
  private String[] videoAddresses = new String[0];

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.course_viewer_screen);

    adapter = new ArrayAdapter<String>(this, R.layout.course_viewer_item);

    Intent intent = getIntent();
    cookieData = intent.getCharSequenceExtra("cookie_data").toString();
    String courseAddress = intent.getCharSequenceExtra("section_contents_address").toString();
    HttpGetRequest getRequest = null;
    try {
      getRequest = new HttpGetRequest(new URI("https://courses.edx.org" + courseAddress));
    } catch (URISyntaxException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    getRequest.addCookieHeader(cookieData);

    final HttpGetRequest request = getRequest;

    final Handler responseHandler = new Handler();
    
    final String exceptionAddress = courseAddress;
    
    Thread headerThread = new Thread(new Runnable() {

      @Override
      public void run() {
        // TODO Auto-generated method stub
        HttpGetRequest getRequest = request;
        String responseText = getRequest.executeGetRequest();
        
        Log.d(TAG, "Content: " + responseText);
        
        Pattern startTagPattern = Pattern.compile("<ol[^<>]*id=\"sequence-list\">");
        Matcher startTagMatcher = startTagPattern.matcher(responseText);
        startTagMatcher.find();
        Log.d(TAG, "Start match: " + startTagMatcher.group());
        Log.d(TAG, "Position: " + startTagMatcher.end());
        Pattern endTagPattern = Pattern.compile("</ol>");
        Matcher endTagMatcher = endTagPattern.matcher(responseText);
        endTagMatcher.find(startTagMatcher.end());
        Log.d(TAG, "End match: " + endTagMatcher.group());
        Log.d(TAG, "Position: " + endTagMatcher.start());
        
        String sectionContents = responseText.substring(startTagMatcher.end(), endTagMatcher.start());
        Log.d(TAG, sectionContents);
        
        LinkedList<String> videoStrings = new LinkedList<String>();
        LinkedList<String> videoDataId = new LinkedList<String>();
        LinkedList<String> videoAddresses = new LinkedList<String>();
        
        try {
          XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
          XmlPullParser xpp = factory.newPullParser();

          xpp.setInput(new StringReader(sectionContents.replaceAll("&", "&amp;")));
          while(xpp.next() != XmlPullParser.END_DOCUMENT) {
            if(xpp.getEventType() == XmlPullParser.START_TAG) {
              if(xpp.getName().equals("li")) { // Find li-tag.{

                // Find the a-tag. All class info is organized in a-tags under the li-tag.
                // Find all a-tags in the li-tags.
                while(xpp.getName() == null || !xpp.getName().equals("a")) {
                  xpp.next();
                }
                
                // Get the data id for this video.
                String dataId = xpp.getAttributeValue(null, "data-id");
                Log.d(TAG, "data-id: " + dataId);
                
                // Get the title for this video.
                String videoDescription = xpp.getAttributeValue(null, "data-page-title");
                Log.d(TAG, "title: " + videoDescription);
                
                // Get all class names as a space separated string
                String aClassAttributesString = xpp.getAttributeValue(null, "class");
                Log.d(TAG, "class: " + aClassAttributesString);
                String[] aClassAttributes = aClassAttributesString.split(" ");
                // Search the class attributes for seq_video.
                // This is our indicator of a video segment.
                for(int i=0; i<aClassAttributes.length; i++) {
                  if(aClassAttributes[i].equals("seq_video")) {
                    videoStrings.add(videoDescription);
                    videoDataId.add(dataId);
                  }
                }
              }

            }
          }

          Iterator<String> it = videoDataId.iterator();
          while(it.hasNext()) {
            try {
              String currentVideoDataId = it.next();
              Pattern videoDataIdPattern = 
                  Pattern.compile(currentVideoDataId.replace("/", ";_"));
              Matcher videoDataIdMatcher = videoDataIdPattern.matcher(responseText);
              videoDataIdMatcher.find();
              Log.d(TAG, "Data id match: " + videoDataIdMatcher.group());
              Log.d(TAG, "Position: " + videoDataIdMatcher.end());
              Pattern dataStreamsPattern = Pattern.compile("data-streams=&#34;");
              Matcher dataStreamsMatcher = dataStreamsPattern.matcher(responseText);
              dataStreamsMatcher.find(videoDataIdMatcher.end());
              Log.d(TAG, "Data stream match: " + dataStreamsMatcher.group());
              Log.d(TAG, "Position: " + dataStreamsMatcher.start());
              Pattern regularSpeedPattern = Pattern.compile("1[.]00:([^,&]*)");
              Matcher regularSpeedMatcher = regularSpeedPattern.matcher(responseText);
              regularSpeedMatcher.find(dataStreamsMatcher.end());
              Log.d(TAG, "Video link match: " + regularSpeedMatcher.group());
              Log.d(TAG, "Position: " + regularSpeedMatcher.start());
              videoAddresses.add(regularSpeedMatcher.group(1));
            }catch(IllegalStateException exception) {
              UnexpectedHttpResponseException uhrException = 
                  new UnexpectedHttpResponseException("Data stream not found.", exception);
              uhrException.setRequestUrl(exceptionAddress);
              uhrException.setResponseHeader(getRequest.getResponseHeaders());
              uhrException.setHttpResponse(getRequest.getResponseContent());
              throw uhrException;
            }
          }
          
        } catch (XmlPullParserException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
        }
        finally {
          
        }
        
        final LinkedList<String> finalVideoTexts = videoStrings;
        final LinkedList<String> finalVideoAddresses = videoAddresses;
        
        responseHandler.post(new Runnable() {
          
          @Override
          public void run() {
            // TODO Auto-generated method stub
            CoursewareSectionViewer.this.videoAddresses = (String[])finalVideoAddresses.toArray(CoursewareSectionViewer.this.videoAddresses);
            CoursewareSectionViewer.this.videoTexts = (String[])finalVideoTexts.toArray(CoursewareSectionViewer.this.videoTexts);
            
            addVideoContents();
          }
        });
      }
    });
    
    headerThread.start();
  }
  
  private void addVideoContents() {
    
    for(int i=0; i<videoTexts.length; i++) {
      adapter.add(videoTexts[i]);
      if(videoTexts[i] != null) {
        Log.d(TAG, "videoTexts[" + i + "]: " + videoTexts[i]);
        Log.d(TAG, "videoAddresses[" + i + "]: " + videoAddresses[i]);
      }else {
        Log.d(TAG, "videoTexts[" + i + "]: null");
        Log.d(TAG, "videoAddresses[" + i + "]: null");
      }
    }
    
    if(videoTexts.length == 0) {
      adapter.add("No videos found in this section");
    }
    
    ListView listView = (ListView)findViewById(R.id.courses_list_view);
    listView.setAdapter(adapter);
    
    if(videoAddresses.length > 0) {
      listView.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int position,
            long id) {
          // Toast.makeText(CoursewareSectionViewer.this, videoTexts[position] + "\n" + videoAddresses[position], Toast.LENGTH_SHORT).show();
          startActivity(new Intent(Intent.ACTION_VIEW, 
              Uri.parse("http://www.youtube.com/watch?v=" + videoAddresses[position])));
        }
      });
    }
  }

}

Java Source Code List

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