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Our second Activity is being started by an Intent. We can access the Intent used to start it and retrieve the "extra" data that was added to it.
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Our intent object now has some data, cool.
0:00
But what do we do on the other side?
0:03
What code do we need to add in the
activity where we are sending this intent?
0:05
So this new activity will be
started with the intent, so
0:09
we can access it right away
inside the onCreate method.
0:12
Add a few lines under setContentView.
0:15
And then here we are going to get
the intent used to start this activity, so
0:17
let's declare an intent
variable named intent.
0:20
The activity base class, as usual,
has a helpful method for us, so type = and
0:23
start typing get, and look at that,
from auto complete we have getIntent.
0:29
All right, now what exactly does this do?
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Well, let's check the documentation.
0:35
We can click on the method and
0:37
then show documentation with either F1 or
Ctrl+J on a Mac.
0:39
Or Ctrl+Q on Windows.
0:43
I know that's kind of a mouthful
of keyboard shortcut combos,
0:45
but this is a useful one
that it pays to know.
0:48
Anyhow, it says here that this returns
the intent used to start the activity.
0:50
Perfect.
0:55
But now what do we do with it?
0:56
Well, let's gamble and see if we can
figure it out from autocomplete.
0:57
We can explore this intent on a new line.
1:01
Type intent., and then here, let's see,
what's the opposite of put extra?
1:03
We want to get data out of it, so
let's start typing get, and look at that.
1:08
There's a bunch of get certain data types
of extras here, so we want getStringExtra.
1:12
Let's see, getStringExtra, and there we
go, it takes a string name as a parameter,
1:17
which is the key for
the string value we want.
1:23
But we need to pass in the key that we
used, which was name in all lower case.
1:26
Let's peek at the documentation
again just to make sure.
1:31
If we hit Ctrl+J on my Mac,
then this tells us it gets a string,
1:34
it returns a string,
based on the key name.
1:39
Cool, just what we want.
1:42
All right,
we have enough to test this out.
1:43
So let's use a log statement to make
sure that this new name is available
1:44
in the activity.
1:48
log.d, and we want to create a tag.
1:49
We'll do that in a second, and we'll pass
in, we need to save this in a variable.
1:52
So let's call this String name = And then
we can pass in name as the log message.
1:56
And for tag, let's create it up here.
2:04
Type public static final string,
TAG in all uppercase, and
2:05
we'll set it equal to the name
of the activity, StoryActivity.
2:11
But we'll do it, again,
with that shortcut.
2:17
StoryActivity.class.getSimpleName.
2:19
So that if we ever change the name, it
will be refactored for us automatically.
2:23
Let's run this and
make sure that it's working.
2:27
Okay, so once again, I will type my name,
tap on the button, and
2:30
if we go to the log, bring it up here, we
have a debug statement, let's look for it.
2:34
Yes, there we go.
2:40
We've got debug inside of our story
activity and there's my name.
2:41
All right, mission accomplished.
2:47
But we have a fragile spot in our code.
2:49
We're using the same key
in two different places.
2:51
One to put our extra into our intent,
and one to get it out.
2:55
What happens if we type
it slightly differently?
2:58
Here, let's change this to a capital N,
and in the next video,
3:00
we'll explore what this does,
and how to fix it.
3:03
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