Showing Revision 3 created 05/24/2016 by Udacity Robot.

1. Title:
   Add the Other Team in XML
2. Description:

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   Before I begin coding,
   I'm going to answer this question.
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   I really still know about only two
   view groups, LinearLayouts and
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   RelativeLayouts.
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   Now the key word right here was that
   these two have to take up equal space.
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   Using layout weight is
   a really easy way to do this.
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   Okay, let's go ahead and
   look at the code.
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   All right, I'm not working in Java
   anymore, so I'm going to go ahead and
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    go over to activity_main.xml.
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    And here's my XML file.
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    So I'm going to start by putting all
    of this code to another LinearLayout.
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    And this is the parent LinearLayout for
    my two mini LinearLayouts.
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    And I'm going to move
    these two lines up here,
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    because they need to be attached to
    the root view, add a closing brace.
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    Okay, Android Studio automatically
    made a closing tag for me right here.
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    So, I'm going to go ahead and
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    cut this closing tag,
    scroll down to the bottom, and paste it.
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    Okay, now I got a red squiggly line,
    and if I look at the error,
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    I can see that it says I need to have
    layout_height and layout_width defined.
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    Whoops!
    All right, let's do that.
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    So because this is the root view, I'll
    go ahead and make this match_parent.
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    Okay, so
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    I have one LinearLayout surrounding
    a child LinearLayout right now.
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    And if I go to the Preview,
    it looks pretty much the same.
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    Okay, so what I'm going to do,
    is I'm going to copy everything in
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    the Team A LinearLayout, and right
    below Team A, I am going to paste it.
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    And this is going to be
    my Team B LinearLayout.
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    So, now things are beginning to
    look a little bit disorganized.
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    So I am going to do a Cmd+A, or
    a select all, and then I am going to
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    use the keyboard shortcut
    Cmd+Option+L to format my code.
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    On Windows, that's Ctrl+Alt+L,
    that looks a little bit better.
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    Now, I just want to make sure that
    you understand what's going on here.
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    Scrolling to the top,
    I have a root LinearLayout here.
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    It starts here, and if I scroll all
    the way to the bottom, it ends here.
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    Inside of that root LinearLayout,
    I'm going to scroll up again.
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    I've got one child layout here,
    which starts here.
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    I'll scroll down slowly.
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    And it ends here.
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    This is for TeamA.
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    And I have another child LinearLayout,
    which starts here.
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    Scroll down slowly, ends here for TeamB.
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    All right,
    now I noticed some red up at the top, so
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    I'm going to scroll up again and
    see what the error says.
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    Wrong orientation, no orientation
    specified, and default is horizontal.
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    Yet this layout has multiple children,
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    where at least one has
    width match_parent.
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    Hm, well I do want it to be horizontal,
    but let's go ahead and
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    specify the orientation.
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    Again, this is not technically needed,
    because the default is horizontal, but
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    it's good to be explicit.
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    Okay, and it was saying something
    about children covering each other up.
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    I'm going to click on Preview.
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    Hm, And this doesn't seem to have really
    changed very much, even though I went
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    to all the trouble of copying and
    pasting another LinearLayout.
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    This might have had to do with
    the error that I just looked at.
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    It was saying that it's
    a horizontal layout.
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    So it's trying to lay these two
    LinearLayouts next to each other, but
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    that the LinearLayout
    has a layout_width of
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    match_parent which fills up the screen.
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    So basically my first LinearLayout
    is filling up the screen, and
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    then the other LinearLayout is getting
    placed next to it somewhere off screen.
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    So let's think about what we actually
    want to have happen at this point.
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    We want to have the two layouts taking
    up equal space and next to each other.
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    So this when we're going to need
    to bring in layout_weights.
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    I'm going to take
    the first LinearLayout and
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    give it a layout_weight of 1.
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    I'm also going to set its width to 0.
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    Okay, so we can see already that we
    do in fact have two LinearLayouts,
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    they're just not really
    being displayed properly.
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    But this is a bit better.
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    So I have to put a layout_weight
    also on my second LinearLayout,
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    this one right here.
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    So I'm going to scroll down.
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    Here's my second LinearLayout.
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    I'm going to do exactly the same thing.
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    I'm going to say that it has
    a layout_weight of 1 as well, so
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    now they have equivalent layout_weights.
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    And then I'm going to
    set the width to 0.
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    Okay, and the reason that I set
    the width of both of them to 0,
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    is basically, that if both of these
    sides aren't taking up any width.
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    Then, it's going to take
    all the extra space,
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    which is the entire screen, and
    divide it up, giving half to one and
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    half to the other, because they
    both have the same layout weight.
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    If that's at all confusing,
    I've linked to a few videos in
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    the instructor notes that
    talk about layout_weight.
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    Okay, but this is looking pretty good,
    except it says Team A.
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    I'm going to scroll down to change
    that here, change this to Team B.
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    Now you might have noticed that
    there is also an error here, and
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    that error occurs because,
    well, we have a duplicate ID.
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    Remember, I just copied and
    pasted the code.
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    So, we basically have two things
    that are trying to have the same id
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    of team_a_score.
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    So, I'm actually going to
    change this to team_b_score.
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    Okay, this is looking pretty good.
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    It's a little hard to see.
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    I'll zoom in.
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    But, it says Team B here.
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    And I got all the correct buttons,
    and all the correct text views.
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     So I'm going to try to
     run this on my phone.
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     Okay, and this looks pretty good.
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     Now if I press the Team A buttons,
     it's updating so that's great.
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     If I press the Team B buttons,
     well, it's also updating.
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     That's special.
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     But remember,
     we just wanted to get the XML right.
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     We didn't really care about the Java.
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     But now that we got the XML working,
     why not fix the Java?