Heads up! To view this whole video, sign in with your Courses account or enroll in your free 7-day trial. Sign In Enroll
Preview
Start a free Courses trial
to watch this video
In this video I implement SharedPreferences for the application.
To fix that I'm going to
use shared preferences.
0:00
I'm going to start by creating a shared
preferences field and an editor field.
0:03
So private shared preferences
mshared preferences and
0:09
then private
sharedpreferences.editor meditor.
0:13
Now that I have these two fields I'm going
0:21
to initialize them right
below setContentView.
0:23
So mSharedPreferences =
getSharedPreferences.
0:25
And we'll need a preferences file name.
0:31
And then Context.MODE_PRIVATE.
0:33
Alt+Enter to create this constant, and
0:41
I'll call it my package
name plus .preferences.
0:45
So
com.teamtreehouse.golfscorecard.preferen-
0:49
ces.
0:56
Looks good.
0:59
Then I'll initialize the editor
to our mSharedPreferences.edit.
1:01
Great.
1:09
Now we've got access to all the pieces we
need and I can start saving the values.
1:09
I'll do that in the on pause method.
1:15
Make some space at the bottom and use
control o to override the on pause method.
1:19
And the on pause method,
I will want to save the score for
1:27
each whole end to a different
shared preference.
1:31
Here is how I will do it.
1:35
First we need to loop
through all the holes.
1:38
So for int I, equals zero, I less than M
1:40
holes.length, I plus plus.
1:44
We'll use the editor, so M editor.put.int.
1:51
Because we're storing an Int
in our shared preference.
1:56
And we'll use a key of KEY_STROKECOUNT,
which I'll create now.
2:00
Alt+Enter, key_strokecount.
2:10
Looks good.
2:15
And then I'm going to add
to this key our index, I.
2:19
This is going to make
18 different keys for
2:29
our shared preferences, and is going
to let us store 18 different values.
2:33
Then we need to put the value into
that key which will be mHoles,
2:39
the holes at that index.get stroke count.
2:47
Perfect.
2:53
Then after the four loop and we've put all
of our strokes into the appropriate key.
2:54
We need to call apply
to set those changes.
3:01
Looks good.
3:05
Now that we've saved our value in onPause,
3:06
I'm going to retrieve them in onCreate and
set them.
3:10
So for each hole,
we're going to set strokes
3:15
equal to our SharedPreferences
object.getInt, and we'll pass in our key,
3:21
which is KEY_STROKECOUNT plus the index,
3:27
and then we'll pass in
a default value of 0.
3:33
And this will set our strokes for
each hole.
3:37
All right.
3:43
Looks good.
3:44
Let's see what happens when we run it.
3:45
Now I'm going to put in some values 3,
2, 1, 1.
3:49
Maybe scroll to the bottom.
3:52
Put some in here.
3:57
Give it 10 for hole 15,
that'll be easy to check, and
4:00
then I'll hit the back button to
completely destroy the activity.
4:03
Let's go back into golf scorecard,
and it looks like it saved our values.
4:09
Even the 10 we put for hole 15.
4:15
Great, it looks like our shared
preferences are working.
4:17
You need to sign up for Treehouse in order to download course files.
Sign up