[Java] GoogleCalendar Android Manager

GoogleCalendar.java

public class GoogleCalendar {
  private Context _context;
  private GoogleCalendarCallback _callback;

  public GoogleCalendar(Context c, GoogleCalendarCallback cb) {
    _context = c;
    _callback = cb;
  }

  public void add(final String title, final Long dateStart, final Long dateEnd,
      final String address, final String description, final String website) {

    if (!this.isExistEvent(title, dateStart.toString())) {
      String[] projection = { "_id", "displayname" };
      Cursor cursor = this.getCursor("calendars", projection, null, null, null);

      if (cursor.moveToFirst()) {
        final String[] calNames = new String[cursor.getCount()];
        final int[] calIds = new int[cursor.getCount()];
        for (int i = 0; i < calNames.length; i++) {
          calIds[i] = cursor.getInt(0);
          calNames[i] = cursor.getString(1);
          cursor.moveToNext();
        }

        AlertDialog.Builder builder = new AlertDialog.Builder(_context);
        builder.setSingleChoiceItems(calNames, -1, new DialogInterface.OnClickListener() {

          @Override
          public void onClick(DialogInterface dialog, int which) {
            ContentValues cv = new ContentValues();
            cv.put("calendar_id", calIds[which]);
            cv.put("title", title);
            cv.put("dtstart", dateStart);
            cv.put("dtend", dateEnd);
            cv.put("hasAlarm", 1);
            cv.put("visibility", 0);
            cv.put("eventLocation", address);

            String fullDescription = description + " Site web : " + website;
            cv.put("description", fullDescription);

            Uri newEvent = insertValues("events", cv);
            if (newEvent != null) {
              long id = Long.parseLong(newEvent.getLastPathSegment());
              ContentValues values = new ContentValues();
              values.put("event_id", id);
              values.put("method", 1);
              values.put("minutes", 15);

              insertValues("events", values);
              _callback.added(true);
              Toast.makeText(_context, R.string.event_added, Toast.LENGTH_SHORT).show();
            }
            dialog.cancel();
          }
        });
        builder.create().show();
      }
      cursor.close();
    } else {
      Toast.makeText(_context, R.string.event_already_added, Toast.LENGTH_SHORT).show();
      _callback.added(false);
    }
  }

  private Uri insertValues(String type, ContentValues cv) {
    final ContentResolver cr = _context.getContentResolver();

    return cr.insert(this.getUriBase(type), cv);
  }

  private Cursor getCursor(String type, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {
    final ContentResolver cr = _context.getContentResolver();

    return cr.query(this.getUriBase(type), projection, selection, selectionArgs, sortOrder);
  }

  private Uri getUriBase(String type) {
    if (Integer.parseInt(Build.VERSION.SDK) == 8)
      return Uri.parse("content://com.android.calendar/" + type);
    else
      return Uri.parse("content://calendar/" + type);
  }

  public Boolean isExistEvent(String title, String dtstart) {
    String[] projection = { "calendar_id", "title", "dtstart" };
    String selection = "title=? AND dtstart=?";
    String[] selectionArgs = { title, dtstart };
    Cursor cursor = this.getCursor("events", projection, selection, selectionArgs, null);

    if (cursor != null) {
      if (cursor.getCount() == 0) {
        Log.d("Event existing", "false");
        return false;
      } else {
        Log.d("Event existing", "true");
        return true;
      }
    } else {
      Log.d("Event existing", "no calendars");
      return null;
    }
  }
}