Android Open Source - CampusUB1 Schedule Activity

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2013 CampusUB1 Development Team
 *//from   w ww . ja  va  2s.  co  m
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dev.campus.schedule;

import java.util.ArrayList;
import java.util.List;

import com.dev.campus.CampusUB1App;
import com.dev.campus.R;
import com.dev.campus.SettingsActivity;

import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.Spinner;
import android.widget.Toast;

/**
 * Class responsible for the schedule activity UI and lifecycle,
 * handles loading, viewing and saving of class schedules.
 * 
 * @author CampusUB1 Development Team
 *
 */
public class ScheduleActivity extends ListActivity implements OnItemClickListener {

  // URLs of formation semesters
  private final String[] SEMESTER_URLS = {
    "http://www.disvu.u-bordeaux1.fr/et/edt_etudiants2/Licence/Semestre1/finder.xml", // LS1
    "http://www.disvu.u-bordeaux1.fr/et/edt_etudiants2/Licence/Semestre2/finder.xml", // LS2
    "http://www.disvu.u-bordeaux1.fr/et/edt_etudiants2/Master/Semestre1/finder.xml",  // MS1
    "http://www.disvu.u-bordeaux1.fr/et/edt_etudiants2/Master/Semestre2/finder.xml"}; // MS2

  // Currently selected group
  private Group mSelectedGroup;
  // List of groups for a specified semester
  private List<Group> mGroups;
  
  // Utilities
  private Context mContext;
  private ProgressBar mProgressBar;
  private ScheduleParser mScheduleParser;
  private ScheduleAdapter mScheduleAdapter;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_list);
    getActionBar().setDisplayHomeAsUpEnabled(true);

    mContext = this;
    mScheduleParser = new ScheduleParser();
    mScheduleAdapter = new ScheduleAdapter(this, new ArrayList<Group>());

    mProgressBar = (ProgressBar) findViewById(R.id.progressbar);
    mProgressBar.setVisibility(View.GONE);
    mProgressBar.setIndeterminate(true);

    ListView listview = getListView();
    View header = (View) getLayoutInflater().inflate(R.layout.schedule_list_header, listview, false);
    listview.addHeaderView(header, null, false);
    listview.setAdapter(mScheduleAdapter);
    listview.setOnItemClickListener(this);

    Spinner spinner = (Spinner) findViewById(R.id.schedule_spinner);
    spinner.setOnItemSelectedListener(new SpinnerOnItemSelectedListener());
    spinner.performClick();
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.default_actionbar, menu);
    return true;
  }

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    mSelectedGroup = (Group) parent.getItemAtPosition(position);
    registerForContextMenu(view);
    view.setLongClickable(false);
    openContextMenu(view);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
    case R.id.menu_settings:
      startActivity(new Intent(ScheduleActivity.this, SettingsActivity.class));
      return true;
    case android.R.id.home:
      finish();
      return true;
    default:
      return super.onOptionsItemSelected(item);
    }
  }

  @Override
  public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    getMenuInflater().inflate(R.menu.schedule_contextual, menu);
  }

  @Override
  public boolean onContextItemSelected(MenuItem item) {
    String urlXml = mSelectedGroup.getUrl();
    switch (item.getItemId()) {
    case R.id.menu_schedule_view_online:
      String urlHtml = urlXml.substring(0, urlXml.length()-3) + "html"; // replace extension from xml to html
      startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(urlHtml)));
      return true;
    case R.id.menu_schedule_download:
      String urlPdf = urlXml.substring(0, urlXml.length()-3) + "pdf"; // replace extension from xml to pdf
      startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(urlPdf)));
      return true;
    case R.id.menu_schedule_import:
      new ScheduleConfirmDialog(mContext);
      return true;
    default:
      return super.onContextItemSelected(item);
    }
  }
  
  /**
   * Clears all items from the adapter view
   */
  public void clearContent() {
    mScheduleAdapter.clear();
    mScheduleAdapter.notifyDataSetChanged();
  }
  
  /**
   * Updates view of current items
   */
  public void reloadContent() {
    mScheduleAdapter.clear();
    mScheduleAdapter.addAll(mGroups);
    mScheduleAdapter.notifyDataSetChanged();
  }
  
  /**
   * Worker thread responsible for retrieving the list of all
   * available groups for a specified semester
   * @author CampusUB1 Development Team
   *
   */
  private class FetchGroupsTask extends AsyncTask<String, Void, Void> {

    @Override
    protected void onPreExecute() {
      clearContent();
      mProgressBar.setVisibility(View.VISIBLE);
    }

    @Override
    protected Void doInBackground(String... urls) {
      if (urls.length > 0) {
        try {
          mGroups = mScheduleParser.fetchGroups(urls[0]);
        } catch (Exception e) {
          cancel(true);
        }
      }
      return null;
    }

    @Override
    protected void onPostExecute(Void result) {
      reloadContent();
      mProgressBar.setVisibility(View.GONE);
    }

    @Override
    protected void onCancelled() {
      mGroups = new ArrayList<Group>();
      CampusUB1App.LogD("Failed to retrieve schedule");
      Toast.makeText(mContext, R.string.schedule_import_failed_fetchgroup, Toast.LENGTH_SHORT).show();
      clearContent();
      mProgressBar.setVisibility(View.GONE);
    }
  }

  /**
   * Custom OnItemSelectedListener used for semesters spinner
   * @author CampusUB1 Development Team
   *
   */
  private class SpinnerOnItemSelectedListener implements OnItemSelectedListener {

    @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
      if (position == 0) {  // dummy item
        clearContent();
        return;
      }
      // offset position by 1 to compensate for dummy item
      new FetchGroupsTask().execute(SEMESTER_URLS[position-1]);
    }

    @Override
    public void onNothingSelected(AdapterView<?> parent) {

    }
  }

  /**
   * Custom confirmation dialog for importing a group schedule
   * to the default calendar of the device
   * @author CampusUB1 Development Team
   *
   */
  private class ScheduleConfirmDialog extends AlertDialog.Builder {

    public ScheduleConfirmDialog(Context context) {
      super(context);
      AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
      builder.setMessage(R.string.schedule_confirm_content)
      .setTitle(R.string.warning)
      .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
          Intent importService = new Intent(ScheduleActivity.this, ScheduleImportService.class);
          importService.setData(Uri.parse(mSelectedGroup.getUrl()));
          mContext.startService(importService);
          finish();
        }
      })
      .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {

        }
      });
      builder.show();
    }
  }
}

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