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Our pizza calculator service now
doesn't have the correct signature.

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So we need to create a phone
dialer to pass into it.

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The context, like I said,
is also our activity.

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So we can just pass in this.

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Let's run the Android app and
see how it looks.

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First, we must set as our
StartUp Project the Android project.

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It's already selected our
preferred device to debug.

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Now that our Android emulator is up and
running, we can enter a value, calculate.

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You see our new message with 11 pizzas,
and we can call.

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You notice the call button
didn't do anything.

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That's because we didn't
add an event to it.

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Back in the main activity,
let's add an event to the call button.

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We'll use our pizzaCalculatorService.

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And call our pizza parlor.

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Now if we run it again.

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We enter the number of people.

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We get our message.

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And when we call,
we get the call dialogue.

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Now let's do the same thing for iOS.

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In the phone dialer for iOS, we'll need to
have a handle on the UI View Controller so

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that we can interact with the interface.

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So let's pass it into the constructor.

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Now that we have a handle
on the UI View Controller,

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we can implement the Call method.

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We will also need to create a URI here.

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Using the iOS framework.

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And with iOS, we first wanna test to
see if we can actually open this URI.

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So if we can open the URI,
it will just open.

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But because we put a not sign here,
if it doesn't open,

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we can handle it in a different way.

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We'll use an alert controller.

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To create a message.

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I've given this alert controller
a title and a message.

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Now we need to indicate the style.

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If we wanna close this dialogue,
we'll have to handle the OK button, but

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in this case we're just
going to close the dialogue.