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Formatting the hourly data to look nice in our app.
Managing and working with dates and times in programming can be, well, challenging at best. Here's a video describing just some of the challenges involved.
Language Resources
- Java SimpleDateFormat
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[MUSIC]
0:00
Fantastic work so far.
0:04
We've set up our adapter and
our view holder,
0:07
and we're getting some sample static
data displayed in our RecyclerView.
0:09
That's pretty exciting, right?
0:12
We're getting super close.
0:14
We have a little bit of formatting to do,
0:16
much in the same way that we had
to format data in main activity.
0:19
We also need to convert the icon
string that Dark Sky provides us
0:22
to our icon name.
0:26
Once we get this formatting done, we'll
get it connected to our actual data model.
0:28
Let's head back into Android Studio and
tackle these next tasks.
0:32
In the Hour class,
0:37
let's update the getTime method
to display our time properly.
0:38
We'll be returning the string value now,
so we'll need to change that.
0:42
So here under getTime,
change this to String.
0:47
Inside here, we'll use the simple
date formatter to format the time.
0:55
SimpleDateFormat, we'll call it formatter,
so new SimpleDateFormat.
0:59
We'll pass in our pattern.
1:05
For our purposes,
we just want the hour and AM or PM.
1:06
So we'll pass in h a.
1:10
Check the teacher's notes as well for
more on these patterns.
1:15
And we need to set the timezone for
this formatter.
1:19
Otherwise, our calculations will all be
based on GMT, or Greenwich Mean Time.
1:21
That's why we added the timezone to
this class way back when we started.
1:27
So formatter.setTimeZone(TimeZone).
1:30
We'll get the TimeZone and
here we pass in our TimeZone.
1:37
In case you couldn't tell yet,
working with dates, times, and
1:44
timezones is one of the most frustrating
things programmers had to deal with.
1:48
Check the teacher's notes for
a funny video on it.
1:53
So in getTime, we need to convert
the time to milliseconds.
1:56
You can do that with date.
2:01
We'll call it dateTime.
2:02
Do our imports.
2:05
We want the Java util import.
2:06
New Date(time * 1000) convert
to milliseconds, and now,
2:11
we just need to return our formatted time.
2:16
So we turn our formatter and
format the time.
2:22
The temperature didn't look
real great in our app either.
2:28
We want to return an int here and
not a double.
2:30
We want the temperature rounded
to get rid of our decimal.
2:41
So we can cast to an int and
use the Math.round function.
2:43
Note that here we're updating this
formatting in the data model itself.
2:53
We could do this in a layout as well,
like we did in the main activity layout.
2:56
I just wanted to show you how
to do it here for the option.
3:01
Now for the icon,
we already have the code to get an icon
3:04
ID from a string over
in our current object.
3:08
Let's create a helper method
that both current and
3:12
hour can call to get that info.
3:15
Let's go to the forecast class.
3:17
We'll write a new method
here at the bottom.
3:20
It will be a public static method.
3:24
It will return an int.
3:27
We'll call it getIconId, and
we'll pass in our iconString.
3:28
We can go over here to Current.
3:38
Grab our long switch statement.
3:39
And cut it out of here, and
now paste it over into Forecast.
3:45
Okay our import for R, and
change icon to iconString.
3:50
Back over in Current,
we can use that method.
3:59
You want to return forecast.getIconID,
and pass in our icon.
4:02
Now over in Hour, under getIcon(),
4:10
we want to return
Forecast.getIconId(icon),
4:14
and we want to change our method
signature here to return an int.
4:20
Lastly, we need to update our hourly list
item layout to use our imagery source for
4:29
the icon.
4:34
Go to the layout, hourly list item,
Come down here to our ImageView.
4:35
We'll add
app:imageResource="@{hour.icon}".
4:49
Okay, let's run this one more time with
our sample data and see what we get.
5:00
And if we hit Hourly Forecast, nice work.
5:14
Our data is coming through and
looking great.
5:19
Let's take a breather here and
come back and
5:21
change our static data
to the Dark Sky data.
5:23
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