1
00:00:00,320 --> 00:00:03,821
All right, so how are we going to
get back to the start of our app?

2
00:00:03,821 --> 00:00:06,990
Let's add a new OnClickListener for
this play_again_button.

3
00:00:06,990 --> 00:00:09,697
And then we can explore our options.

4
00:00:09,697 --> 00:00:16,920
So choice2Button.setOnClickListener(new
OnClickListener), and there we go.

5
00:00:16,920 --> 00:00:18,540
Now, to get back to MainActivity,

6
00:00:18,540 --> 00:00:21,640
we could use a brand new intent,
just like we've seen before.

7
00:00:21,640 --> 00:00:23,680
Except this time,
it would be going the other way.

8
00:00:23,680 --> 00:00:26,380
We would be starting the MainActivity
from our StoryActivity,

9
00:00:26,380 --> 00:00:30,260
and it would technically work, but it
would actually be adding a new activity on

10
00:00:30,260 --> 00:00:34,150
something behind the scenes called
our navigation stack, or back stack.

11
00:00:34,150 --> 00:00:35,520
More on that in just a moment.

12
00:00:35,520 --> 00:00:38,206
We actually all ready have
a relationship with MainActivity here.

13
00:00:38,206 --> 00:00:40,816
We started StoryActivity
from MainActivity.

14
00:00:40,816 --> 00:00:43,836
So, that means we can go back to it
with a very simple activity method.

15
00:00:43,836 --> 00:00:47,907
We can call finish here, which will finish
the current activity and get rid of it,

16
00:00:47,907 --> 00:00:50,208
taking us back to
the existing MainActivity,

17
00:00:50,208 --> 00:00:52,636
which might even still be
in memory from before.

18
00:00:55,050 --> 00:01:00,037
Okay, so we come in here,
add a new name, start the adventure and

19
00:01:00,037 --> 00:01:03,411
navigate all the way to
the end of the story.

20
00:01:03,411 --> 00:01:06,350
And if we hit Play Again,
it goes back to beginning.

21
00:01:06,350 --> 00:01:06,860
Cool, all right.

22
00:01:06,860 --> 00:01:09,470
So, this works well but
I'd like to improve it slightly and

23
00:01:09,470 --> 00:01:12,390
make our app navigation
a little more robust.

24
00:01:12,390 --> 00:01:16,711
When a user taps on Play Again, do we want
to restart the story with the same name or

25
00:01:16,711 --> 00:01:20,500
do we wanna go all the way to beginning
and have the user enter a new name?

26
00:01:20,500 --> 00:01:21,720
We could do both.

27
00:01:21,720 --> 00:01:24,480
Let's change this to have the play
again button restart the story with

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00:01:24,480 --> 00:01:26,260
the same name at page zero.

29
00:01:26,260 --> 00:01:30,150
And then in the next video, we can talk
briefly about Android app navigation and

30
00:01:30,150 --> 00:01:33,150
how to get all way back to
the MainActivity in a different way.

31
00:01:33,150 --> 00:01:37,430
So, to restart the story,
all we need to do is load page zero again.

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00:01:37,430 --> 00:01:41,352
We can delete this finish line, or comment
out if you wanna save it for reference.

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00:01:41,352 --> 00:01:44,848
And then type loadPage(0).

34
00:01:44,848 --> 00:01:47,562
We could test this, but
we're going to have a problem.

35
00:01:47,562 --> 00:01:48,683
Can you guess what it is?

36
00:01:48,683 --> 00:01:49,806
All right, let's take a look.

37
00:01:52,152 --> 00:01:56,053
All right, so we'll do the story,
go through to the end,

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00:01:56,053 --> 00:02:00,443
click on Play Again, and look at that,
we have a missing button.

39
00:02:00,443 --> 00:02:02,545
It's still invisible.

40
00:02:02,545 --> 00:02:04,010
Okay, this is an easy fix.

41
00:02:04,010 --> 00:02:07,170
We can just make sure our buttons
are visible each time we load them.

42
00:02:07,170 --> 00:02:12,585
So, here in our fancy new loadButtons
method, let's add a line at the top.

43
00:02:12,585 --> 00:02:16,540
Choice1Button.setVisibility, and

44
00:02:16,540 --> 00:02:19,880
we'll just set it to
View.VISIBLE each time through.

45
00:02:20,980 --> 00:02:28,310
And we can do the same thing for choice2,
choice2Button.setVisibility, View.VISIBLE.

46
00:02:28,310 --> 00:02:29,337
Let's just make sure this is working.

47
00:02:32,516 --> 00:02:34,409
Okay, start the adventure.

48
00:02:34,409 --> 00:02:36,612
Go to the end, Play Again.

49
00:02:36,612 --> 00:02:39,190
And now we have two buttons working,
very cool.