temperature conversion app in android studio using kotlin

So, let's do the first conversion, Celsius to Fahrenheit, all right? So, I'm going to say val m圜onvertedValue and then I'll enter in this formula right here.

So, I basically copy this formula down here. Right here, this has the Celsius to Fahrenheit formula, and if you scroll down, you can look at Fahrenheit to Celsius formula here as well. And the first link is usually a good one. And if you want to look this up, you can go to Google and type in, Celsius to Fahrenheit formula. This is the math that we're going to need to do. And here, I have the two formulas that I have pasted in: Celsius to Fahrenheit conversion formula and then I have Fahrenheit to Celsius conversion formula. So, this is actually a string this is not a number. So, I have this string variable set up with this number 75.6, but it 's within double quotes.

And you can read through this if you want to understand number types and some other things about convergence, run some sample code, and more, but I'm going to go back to my playground and work on the conversion. So unfortunately, they're not going to work for us here because with temperatures and conversion you're looking at math and you're looking at decimal digits. They don't have decimals and digits after the decimals. A very prominent type for numbers is integer, and integers are whole numbers. If you look over here, the type of double allows us to have a digit, decimal point, and a lot of numbers after the decimal point. And two prominent types you see here are Float and Double, and we're going to use double for our app. Here is the playground and if you pull up another browser tab and type in Kotlin number types, this is the page that pops up and you can look at numbers and the various types that are available. So, let's pull up a browser window in our Kotlin playground and look at some other types like numbers in Kotlin. Now, since we have to do some math with it, we actually have to convert the first editable type that we get to string, and then the string to a number type before we can do the math. toString to convert that to string and then display it, either in our logs or in the form of a message to the user using Toasts. And then in prior videos, you've seen that we've been using. And editable is what we get when we reference the text property of the view. So, whatever we input in our app right here, we're going to receive it as editable, which we're going to convert to string.

We'll now work with Kotlin number types in this video, which will set us up for the math that we have to do within these two methods.īecause remember, we're getting the view type of edit text over here. And then if I click on toFahrenheit to fahrenheit: button clicked. You see it says toCelsius and button clicked. So, when I actually go ahead and click on a button here, I'll click on toCelsius. And the second one, toFahrenheit sets the tag to toFahrenheit and the message to button clicked. The first one toCelsius sets the tag to toCelsius with the message of button clicked. I have a Log.i for information on both of my methods. Hope you were able to complete the task I had assigned at the end of the last video. you could do this by using an identityhashmap: class weatherstation // invoke all observers Traditionally, when something subscribes to something else, it is responsible for unsubscribing itself.

Temperature conversion app in android studio using kotlin