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You have completed Custom Views in Android!
You have completed Custom Views in Android!
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In this video we'll talk about custom Views and then find some data to use!
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[SOUND] Hi, I'm Ben, and in this workshop,
0:00
we're going to learn about custom views.
0:04
Even though Android has a ton of U types,
occasionally we need to make our own.
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One common example of
this would be a graph.
0:14
Android doesn't give us any
tools to help visualize data.
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So if we want to show a bar graph or a pie
chart, we're going to need a custom view.
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And a graph is exactly what we're
going to be making in this workshop.
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But to make it more exciting,
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instead of graphing some boring fake data,
we're going to graph stock data.
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And by the end of this workshop, you'll
have a complete stock chart that looks
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just like what you'd see at a brokerage.
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But before we get to the app,
let's take a minute to talk about
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where we're going to get the data and what
type of stock chart we're going to create.
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We'll be getting our data
from the NASDAQ web site.
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Just search for the symbol you're
interested in, I'll use GOOG for
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Alphabet Inc,
which is the company that owns Google.
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Then on the left, pick Historical Quote.
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And here, we've got data for
every day that the market was open.
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We've got the date, what the price was
when the market opened, then the highest
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and lowest prices during the day,
then the price when the market closed, and
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finally, the volume, which is the number
of shares that traded that day.
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So let's set the timeframe to something
like 2 years, and then at the very bottom,
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We can click to download this file in
Excel format, which just gives us a CSV.
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Nice, now to see what kind
of chart we'll be creating,
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scroll back up to the top, and
click on Basic Chart on the left.
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Then pick a timeframe of 1 month and
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a chart type of candlestick,
and then click Update Chart.
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And this is about what our
finished chart should look like,
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with each day being
represented by a candlestick.
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A candlestick is created by using
four of the values we just saw.
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Here's a nice image from Wikipedia
explaining how they work.
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Notice that the rectangle
part changes color,
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depending on whether the closing price is
higher or lower than the opening price.
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So back in the chart, on this day,
the close was lower than the open.
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All right, now that we've got our data,
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and we know how to turn it into a chart,
let's make an app.
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Also, if you want some more
information about stocks or
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candlestick charts,
check out the teacher's notes below.
2:26
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