android 如何获取通话记录

  String str = "";
  int type;
  long callTime;
  Date date;
  String time= "";
  ContentResolver cr = getContentResolver();
  final Cursor cursor = cr.query(CallLog.Calls.CONTENT_URI, new String[]{CallLog.Calls.NUMBER,CallLog.Calls.CACHED_NAME,CallLog.Calls.TYPE, CallLog.Calls.DATE}, null, null,CallLog.Calls.DEFAULT_SORT_ORDER);
  for (int i = 0; i < cursor.getCount(); i++) {   
  cursor.moveToPosition(i);
  str = cursor.getString(0);
  str = cursor.getString(1);
  type = cursor.getInt(2);
  SimpleDateFormat sfd = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
  date = new Date(Long.parseLong(cursor.getString(3)));
  time = sfd.format(date);
  }