CODEWITHSUNDEEP
javaandroidjsonsimpledateformat
esQmo_
esQmo_

Reputation: 1709

How to convert date String from JSON to time span

The time value I get from JSON response is of format "sun dd/mm/yyyy - HH:mm" and I want to convert it to a time span instead (10 min ago, 2 days ago...). For that I made a method converts given String of dataTimeFormant into "X Hours Ago" format and returns x hours ago in a string format then I can put in a textView.

Everything seems correct, I think, but the app crashes on start with a NullPonterException to a line of my code, so probably I have made things wrong.

   @RequiresApi(api = Build.VERSION_CODES.N)
public String dateConverter(String dateStringFormat) {
    Date date = null;
    SimpleDateFormat currentDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z");
    try {
        date = currentDateFormat.parse(dateStringFormat);
    } catch (ParseException e) {
        e.printStackTrace();
    }

    SimpleDateFormat requireDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String currentDate = requireDateFormat.format(date);

    long currentTimeInMilis = 0;

    try {
        Date currentDateObject = requireDateFormat.parse(currentDate);
        currentTimeInMilis = currentDateObject.getTime();
    } catch (ParseException e) {
        e.printStackTrace();
    }
    CharSequence timeSpanString = DateUtils.getRelativeTimeSpanString(currentTimeInMilis, System.currentTimeMillis(), DateUtils.MINUTE_IN_MILLIS);

    return timeSpanString.toString();
}

My adapter onBindView method:

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int i) {
  //...
  //...
  //...
        DateConvert converter = new DateConvert();
        String postTime = converter.dateConverter(this.news.get(i).getCreated());
        viewHolder.articleCreatedDate.setText(postTime);

    }

The logcat error points to:

String currentDate = requireDateFormat.format(date);

and :

String postTime = converter.dateConverter(this.post.get(i).getCreated());

I'm unable to find the cause because if I remove the call to that function everything works perfectly, probably there are better ways to achieve this?

Thanks.

Upvotes: 0

Views: 367

Answers (1)

Deddy
Deddy

Reputation: 56

I am new here, hopefully I can help.

The first thing I notice is there is no closing single quotation after 'Z:

SimpleDateFormat currentDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z'");

Besides, the problem is the "currentDateFormat" does not portray the proper date input format which causes it not to be able to parse properly. If the input is "sun dd/MM/yyyy - HH:mm" then the format should be:

SimpleDateFormat currentDateFormat = new SimpleDateFormat("EEE MM/dd/yyyy '-' HH:mm");

Or

SimpleDateFormat currentDateFormat = new SimpleDateFormat("EEE MM/dd/yyyy - HH:mm");

Then date = currentDateFormat.parse(dateStringFormat); should be able to parse properly and the "date" will not have "null" value.

Hope this helps.

Upvotes: 2

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