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Updating and Creating Layout Files
5:19In this video I create the project, update main_activity.xml to only contain a ListView, and create a layout resource to be the basis of the rows in our ListView.
For the rest of these videos, I will be
showing how I chose to solve the problem.
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There are lots of ways to write an app.
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And as long as the app works,
you shouldn't be too concerned with how
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you got it to work,
at least while you're still learning.
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That said, I'm going to jump right in and
get started.
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I am going to call
the app Golf Score Card,
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and hit next, next,
empty activity, next and finish.
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Knowing that this activity is mostly
just a big list, I am going to start
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by extending list activity, remember when
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we're extending list activity, our main
layout is a list view with a special ID.
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Let's go ahead, and make some changes
to activity main to make that the case.
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I'm going to get rid of the text view.
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And drag in a list view.
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Then, I'm going to give
it the ID of @android.
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ID forward slash list.
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Looks good.
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Now, that I've got my activity main.xml
all sorted out, I'm going to create a list
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item.xml, which will be the xml file
describing each row of the list view.
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The first thing I'm gonna do is
change the orientation to horizontal.
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And let's go ahead, and import the tools
name space as well by typing tools, and
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hitting tab.
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Alright.
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From the mock ups,
I know that the left most column
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is going to be a text view
representing the label of the hole.
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Which in this case is hole one,
hole two, hole three and so on.
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Next to that is another text view
that represents the score for
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that particular hole.
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Next to that is a button that
will remove a stroke, and
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then, another button
that will add a stroke.
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I'm going to use the lay out width and
lay out wait components to make
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each of these fit on the screen
just a little better.
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I am going to set the layout
width to zero dp as that
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allows us to use
the layout_width attribute.
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Layout_weight attribute.
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And I'm going to set the weight of the
first TextView, which is the label, to 3.
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The weight of the second TextView,
which is the score, or
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strokes taken, to 2, and
the weight of the buttons to 1.
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And then, let's see how that looks.
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That looks pretty good, but
there's a lot of text on that button,
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a lot more than we need.
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Probably, pretty safe just
using a plus and a minus sign.
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And while we're in the text side
of things, let's go ahead and
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update these IDs.
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The first ID should be set to hole label.
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And I'm gonna call
the second one stroke count.
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This first button,
I'm going to call remove stroke button.
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On the second button,
I'm going to call addStrokeButton.
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Alright.
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Now, the layout dimensions look okay,
but the text is a little small, so
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I'm gonna change that.
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And it's going to recommend
that I use SP instead of DP.
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So, we'll do that.
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And I'm just gonna copy this, and
make everything have the same text size.
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Alright.
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One last step that i'm gonna do is change
these text to something more meaningful.
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We'll change this one to be whole one.
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And this one to be zero.
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And then, i'm going to change
the name spaces for these two tools.
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I don't want these to
actually show up in the app.
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I'm just setting them to this, so
I can look them in the design tab.
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And that's what the tools
name space is for.
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Alright we've created both of our layouts.
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