Android Open Source - mobile2-android Course Discussions Activity

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License

The source code is released under:
Apache License
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Java Source Code

package com.ecollege.android;
/*  w w  w . j  a  va2  s  .com*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;

import roboguice.inject.InjectExtra;
import roboguice.inject.InjectView;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;

import com.ecollege.android.activities.ECollegeListActivity;
import com.ecollege.android.adapter.UberAdapter;
import com.ecollege.android.adapter.UberItem;
import com.ecollege.android.util.CacheConfiguration;
import com.ecollege.android.view.helpers.ResponseCountViewHelper;
import com.ecollege.api.ECollegeClient;
import com.ecollege.api.model.ContainerInfo;
import com.ecollege.api.model.Course;
import com.ecollege.api.model.DiscussionTopic;
import com.ecollege.api.model.ResponseCount;
import com.ecollege.api.model.UserDiscussionTopic;
import com.ecollege.api.services.discussions.FetchDiscussionTopicsForCourseIds;
import com.google.inject.Inject;

public class CourseDiscussionsActivity extends ECollegeListActivity {
  
  public static final String COURSE_ID_EXTRA = "COURSE_ID_EXTRA";
  private static final int VIEW_TOPIC_REQUEST = 0;
  
  @Inject ECollegeApplication app;
  @Inject SharedPreferences prefs;
  @InjectView(R.id.reload_button) Button reloadButton;
  @InjectView(R.id.unit_dropdown) Spinner unitDropdown;
  @InjectView(R.id.course_title_text) TextView courseTitleText;
  @InjectExtra(COURSE_ID_EXTRA) long courseId;
  
  protected ECollegeClient client;
  private TopicsAdapter topicAdapter;
  private LayoutInflater viewInflater;
  private List<UserDiscussionTopic> allTopics = new ArrayList<UserDiscussionTopic>();
  private List<CourseUnit> allUnits = new ArrayList<CourseDiscussionsActivity.CourseUnit>();
  
  private CourseUnit currentUnitFilter = new CourseUnit();
  
  private class CourseUnit implements Comparable<CourseUnit> {
    public CourseUnit() {
    }
    public CourseUnit(long unitNumber, String unitHeader, String unitTitle) {
      this.unitNumber = unitNumber;
      this.unitHeader = unitHeader;
      this.unitTitle = unitTitle;
    }
    public long unitNumber = -1;
    public String unitHeader;
    public String unitTitle;
    
    public long getUnitNumber() {
      return unitNumber;
    }
    
    public int compareTo(CourseUnit another) {
      if (unitNumber == -1) return -1; //All at top
      if (another == null) return 1;
      return toString().compareTo(another.toString());
    }
    
    @Override
    public boolean equals(Object o) {
      if (o == null) return false;
      if (!(o instanceof CourseUnit)) return false;
      return ((CourseUnit)o).toString().equals(toString());
    }
    @Override
    public int hashCode() {
      return toString().hashCode();
    }
    @Override
    public String toString() {
      if (unitNumber == -1) {
        return "All Units";
      }
            return String.format("%s %s: %s", unitHeader, unitNumber, unitTitle);
    }
  }
  
    @Override public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.course_discussions);
        client = app.getClient();
        viewInflater = getLayoutInflater();
        
        
        Course course = app.getCourseById(courseId);        
      if (course != null) {
        courseTitleText.setText(Html.fromHtml(course.getTitle()));
      }
        
        configureControls();

    topicAdapter = new TopicsAdapter(this);
        setListAdapter(topicAdapter);
        fetchTopicsForSelectedCourses(false);
    }
    
    @Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {
      if (requestCode == VIEW_TOPIC_REQUEST) {
      fetchTopicsForSelectedCourses(true);
      }
    }

  private void configureControls() {
        reloadButton.setOnClickListener(new View.OnClickListener() {
      public void onClick(View v) {
        fetchTopicsForSelectedCourses(true);
      }
    });
        
        unitDropdown.setOnItemSelectedListener(new OnItemSelectedListener() {

      public void onItemSelected(AdapterView<?> parent, View view,
          int position, long id) {
        
        Object item = parent.getItemAtPosition(position);
        
        if (item instanceof CourseUnit) {
          currentUnitFilter = (CourseUnit)item;
          updateCurrentTopics();
        }
      }

      public void onNothingSelected(AdapterView<?> parent) {
        currentUnitFilter = new CourseUnit();//All Item
        updateCurrentTopics();
      }
          
    });
        
  }
  
  private void fetchTopicsForSelectedCourses(boolean reload) {
    topicAdapter.beginLoading();
    CacheConfiguration cacheConfiguration = new CacheConfiguration();
    cacheConfiguration.bypassFileCache = reload;
    cacheConfiguration.bypassResultCache = reload;
    buildService(new FetchDiscussionTopicsForCourseIds(courseId))
      .configureCaching(cacheConfiguration)
      .execute();
  }
  
  public void onServiceCallException(FetchDiscussionTopicsForCourseIds service, Exception ex) {
    topicAdapter.hasError();
  }
  
  public void onServiceCallSuccess(FetchDiscussionTopicsForCourseIds service) {
    allTopics = service.getResult();
    
    HashSet<CourseUnit> unitSet = new HashSet<CourseDiscussionsActivity.CourseUnit>();
    
    unitSet.add(new CourseUnit());
    
    for (UserDiscussionTopic t : allTopics) {
      ContainerInfo ci = t.getTopic().getContainerInfo();
      unitSet.add(new CourseUnit(ci.getUnitNumber(),ci.getUnitHeader(),ci.getUnitTitle()));
    }
    
    List<CourseUnit> sortedUnits = new ArrayList<CourseDiscussionsActivity.CourseUnit>(unitSet);
    Collections.sort(sortedUnits);
    
    allUnits = sortedUnits;
    
    ArrayAdapter<CourseUnit> adapter = new ArrayAdapter<CourseUnit> (this, R.layout.transparent_spinner_text_view, allUnits);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    unitDropdown.setAdapter(adapter);
    
    topicAdapter.setLastUpdatedAt(service.getCompletedAt());
    updateCurrentTopics();
  }
  
  protected void updateCurrentTopics() {
    if (currentUnitFilter == null || currentUnitFilter.getUnitNumber() == -1) {
      topicAdapter.updateItems(allTopics);
    } else {
      List<UserDiscussionTopic> filteredTopics = new ArrayList<UserDiscussionTopic>();
      
      for (UserDiscussionTopic userTopic : allTopics) {
        ContainerInfo ci = userTopic.getTopic().getContainerInfo();
        if (ci.getUnitNumber() == currentUnitFilter.getUnitNumber()) {
          filteredTopics.add(userTopic);
        }
      }
      topicAdapter.updateItems(filteredTopics);
    }
  }
  
    @Override
  protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    
    @SuppressWarnings("unchecked")
    UberItem<UserDiscussionTopic> item = (UberItem<UserDiscussionTopic>)l.getItemAtPosition(position);
    
    UserDiscussionTopic selectedTopic = item.getDataItem();
    Intent intent = new Intent(this, UserTopicActivity.class);
    intent.putExtra(UserTopicActivity.USER_TOPIC_EXTRA, selectedTopic);
    startActivityForResult(intent, VIEW_TOPIC_REQUEST);
  }
    
  static class ViewHolder {
        ImageView icon;
        TextView titleText;
        TextView totalResponseCountText;
        TextView unreadResponseCountText;
        TextView userResponseCountText;
    }
  
  protected class TopicsAdapter extends UberAdapter<UserDiscussionTopic> {
  
    
    public TopicsAdapter(Context context) {
      super(context, true, false, false);
    }

    @Override
    protected Object groupIdFunction(UserDiscussionTopic item) {
            ContainerInfo ci = item.getTopic().getContainerInfo();
            return String.format("%s %s: %s", ci.getUnitHeader(), ci.getUnitNumber(), ci.getUnitTitle());
    }
        
    @Override
    protected View getDataItemView(View convertView, ViewGroup parent,
        UberItem<UserDiscussionTopic> item) {
      ViewHolder holder;
      
      if (convertView == null) {
        convertView = viewInflater.inflate(R.layout.user_topic_item, null);
        
        holder = new ViewHolder();
        holder.icon = (ImageView) convertView.findViewById(R.id.icon);
        holder.titleText = (TextView) convertView.findViewById(R.id.title_text);
        holder.totalResponseCountText = (TextView) convertView.findViewById(R.id.total_response_count_text);
        holder.unreadResponseCountText = (TextView) convertView.findViewById(R.id.unread_response_count_text);
        holder.userResponseCountText = (TextView) convertView.findViewById(R.id.user_response_count_text);
        convertView.setTag(holder);
      } else {
        holder = (ViewHolder) convertView.getTag();
      }
      
      UserDiscussionTopic userTopic = item.getDataItem();
      DiscussionTopic topic = userTopic.getTopic();
      ResponseCount responseCount = userTopic.getChildResponseCounts();
      holder.titleText.setText(Html.fromHtml(topic.getTitle()).toString());
      
      ResponseCountViewHelper responseCountViewHelper = new ResponseCountViewHelper(
          getBaseContext(),
          holder.icon,
          holder.unreadResponseCountText,
          holder.totalResponseCountText,
          holder.userResponseCountText
      );
      responseCountViewHelper.setResponseCount(responseCount);
      
      return convertView;
    }

    
  }
}
Java Source Code List
