Android determine empty string

Question

I have a class retrieving data from user's calendar, where I test the event title for displaying info, if data is empty, then print a message saying no upcoming events. Printing a valid event is working properly, but when there's no calendar event it won't return the that the data is empty. Here are some codes:

   public class CalendarEventFragment extends Fragment {

    private static final String TAG = "CalendarEventFragment";

    private TextView mEventDate;
    private TextView mDivider;
    private TextView mEventTime;
    private TextView mEventTitle;

    //event data
    List<CalendarEvent> mCalendarEvents;
    String mDateString;
    String mTimeString;
    String mTitleString;

    public CalendarEventFragment() {

    }

    public CalendarEventFragment(List<CalendarEvent> calendarEvents, int i) {
        mCalendarEvents = calendarEvents;
            mDateString = calendarEvents.get(i).getmEventDate() + "/" +
                    calendarEvents.get(i).getmEventMonth() + "/" +
                    calendarEvents.get(i).getmEventYear();
            mTimeString = calendarEvents.get(i).getmEventStartTime();
            mTitleString = calendarEvents.get(i).getmEventTitle();
    }

    private boolean checkData() {
        return mDateString != null || mTimeString != null || mTitleString != null;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.widget_calendar, container, false);

        Log.e(TAG, "cal created");
        mEventDate = (TextView) root.findViewById(R.id.event_date);
        mDivider = (TextView) root.findViewById(R.id.divider);
        mEventTime = (TextView) root.findViewById(R.id.event_time);
        mEventTitle = (TextView) root.findViewById(R.id.event_title);

        mEventDate.setText(mDateString);
        mEventTime.setText(mTimeString);
        if(mTitleString != null) {
            mEventTitle.setText(mTitleString);
        }else{
            mEventTitle.setText(getString(R.string.null_calendar_data));
        }

        return root;
    }
}

Because an `empty` String ("") **is not the same as** `null` — Phantômaxx, May 03 '14 at 13:02
possible duplicate of [How to check whether a string is not null & empty?](http://stackoverflow.com/questions/3598770/how-to-check-whether-a-string-is-not-null-empty) — Carl Anderson, Jul 23 '14 at 16:58

score 2 · Accepted Answer · answered May 03 '14 at 13:06

2

Its string so check its value.
Check like below

if(!TextUtils.isEmpty(myString))

System.out.println("myString is not empty");
else
System.out.println("myString is empty");

answered May 03 '14 at 13:06

user2323471

85
6

You declared your string like myString =""; – user2323471 May 03 '14 at 13:21
string is retrieved from another class by getting user's calendar event as stated in the question – xXJJJasonMokXx May 03 '14 at 13:30
Please Check your data through debug. Damm sure you will be find your bug. – user2323471 May 03 '14 at 13:38

score 1 · Answer 2 · answered May 03 '14 at 13:01

1

Try mDateString != null && mDateString.trim().length() > 0

answered May 03 '14 at 13:01

Alexander Kulyakhtin

47,782
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Rat-a-tat-a-tat Ratatouille · Answer 3 · 2014-05-03T13:14:30.533

0

you could also try using this

TextUtils.isEmpty(mDateString)

this will return true if empty or even null.

edited May 03 '14 at 13:14

answered May 03 '14 at 13:03

Rat-a-tat-a-tat Ratatouille

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Android determine empty string

3 Answers3