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Hello my name is Martez or car.



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And it's literally all we're going to continue building our pre-calculate application.



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So now let's go into an android studio so here it is.



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Our Let's go into this content under a limited example so here it is our layout.



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And here I want to show you how to interact with from our job accords with our layout views here.



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So for example we do not have to interact with the speed calculator calculator text view because this



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value is constant.



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And we do not have to change it.



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But let's take a look at this text.



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This text field we have to actually interact with this text because the value that the user enters inside



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it it takes is going to be of value that you're going to work with.



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So this means that in order to interact from our Java codes with this one we at this edit text we need



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to provide an ID for this text so that we can connect our overcoats with our edit text here and take



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a look at this text view we do not have to interact with this takes you here from our job codes because



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this person takes a view is going to be a constant value and it's not actually going to be changed.



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So we are not going to provide our actually an idea for this text.



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That's not necessary but we must actually provide an ID for this added text so that's selective editing.



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And here you can see this id attribute at the top.



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So for the OED to step in here.



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EDT.



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Enter percent and then first an entry on your keyboard.



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So this is going to be the idea of these editors.



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Let's select this one.



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This edits yet enter number.



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So here for the idea just typing here.



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EDT.



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Enter number and in person entered in your keyboard.



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We also need to actually interact with the spot in selected spots.



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And here just for the idea to they in here between calculate



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and then person on your keyboard.



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So here it's going to show us this dialog it says update uses just as well.



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This will update all examined references and Jawa are field references.



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So this is very important because when you change an idea of a specific user interface component if



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you have a file or a fight inside or a project called Or And all of these references all of these IDs



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all of these references are inside that fight and that fight is going to be updated constantly.



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So whenever that we actually run our application anew or I'll be DOZHD specific references and IDS is



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going to be created.



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So it just that this our file is going to be updated is going to be updated when we actually change



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the idea of this spot.



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And so yes that's true.



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So just to check the box that says don't ask during this session just click on yes be accepts that select



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the Spartan and the idea of this button is and calculate.



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And finally we need to provide an ID for these results takes.



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Again we want to change the value of the state's view.



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Later we want to actually interact with this takes from October Collette's so select is text view and



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for the idea of say thing here he the result and then press enter on your keyboard.



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So now let's go into our main activity the java file here and here inside our main activity class we



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can declare some classes here.



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So first of all you can see at the top it says the package.



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So here it is that my package name and project name.



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So here you can see this import for this import statements.



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So these classes are actually imported into our file and whenever we want to use a new class inside



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our file.



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These are some new classes are going to be actually imported into our file automatically.



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So in order to enable that or to import feature in Android studio we need to open their preferences



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at the top just click on Android studio and then click on preferences.



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If you're using a Windows machine you just need to click on file and then click on preferences or settings



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and then click on play.



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So here just click on preferences.



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And here you can see this is appearance and behavior.



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So if you can actually to change the appearance and we can change the menus and toolbars.



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So if you click on this system settings you can see these options here.



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So now let's click on the editor of the editor and click on general here.



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So if I open is generally considered this option here it says auto import.



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So here it says for the exam and make sure to check the checkbox Shaugh import to pop up.



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And for the job it says insert imports on paste all show imports pop up optimize imports on the fly.



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Make sure to check all of these actually check boxes here at unbe U.S. imports on the fly.



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Sure imports suggestions for static methods and fields.



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So here when you actually checked all of these check boxes you just need to click on OK.



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So now let's go back to Antrix studio here.



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Now let me show you the emulator so we have d text here right.



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And we want to interact with this text.



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So if we need to actually declare or define and it takes inside our door file inside our main activity



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class.



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So inside a scope by scope I mean that the opening curly place and the closing curly brace of these



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men I think the class.



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So inside Ismailia of the class here I can say it it takes.



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So here I am declaring this rowdy actually EDT.



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Enter persons.



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So this is the name of my valuable.



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So just put a semicolon here because here you just want to declare my variable.



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I don't want to create my variable and initialize it.



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So if we have another editrix that we want to interact with this one enter number.



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So again it takes EDT entered number semicolon and makes sure to actually declare these variables as



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private.



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So put the private key word here so that other classes do not actually accidentally access the value



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of these variables because those classes do not need to access these values.



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So just declare them as private.



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So let's go inside these and create a method here inside the curly braces of this uncreate method.



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And here I can initialize my editor access so I can see it Itay inter-personal assignment operator.



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So first of all I need to cast this object to R to an object.



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You're going to learn more about casting later but for now just know that we are dealing with views



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and an object editor is actually a subclass of view.



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So here we must cast our view object to an object so that the compiler knows that we are dealing with



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an elitist object not a view object.



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So he has to step in here or find view by ID because we want to connect our object with our user interface



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component inside our lay out.



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We need to say find view Id say the transistors just they've been here or Id thought EDT and to a person



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that.



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So now this object is actually connected to this.



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It's interpersonal and that reference is actually stored inside this variable.



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EDT enter percent.



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So you can see that the name of my variable and the name of this ID is actually the same.



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You don't have to do that.



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You can actually change the name of this variable but I prefer that the name of the variable and the



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name of the ID to be the same.



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And again this is not a must.



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You can change the name of your ID you can change the name of your value but these two names do not



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have to be the same.



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So now let's actually initialize our EDT.



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Enter number variables are here to stay.



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And here it is the Enter number assignment operator.



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Let's cast this object to an eddy takes the object find view by ID or that Id dot EDT enter number ADT



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enter number semicolon.



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OK so now we initialized are in.



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I should edit text objects.



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So now let me show you the emulator.



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So let me close this keyboard so we also have the spot in calculating the result button.



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So we also need to declare of idea inside our file and we need to connect are valuable with we are actually



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this one with this button up user interface component.



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So inside don't of the class here I can say.



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So let's just step in here.



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Private and then name it the type is going to be button and the name is going to be PTEN calculate



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semicolon.



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So now let's go inside this uncreate let's say Pythian calculate assignment operator let's cast this



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object to a button object find view by ID or that Id that PTEN calculate semicolon.



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So now we actually connected our object here with this one.



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It is pretty and Chalte really use an interface component and we also have this takes resolved.



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So let's also declare a text inside the domain of the class.



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Let's say private text view takes the result semicolon.



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And now let's go inside this uncreate Smurfette that takes the result assignment operator let's cast



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this object to a text view object find view by id r that ID that takes the resolved semicolon.



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So here it is actually our initialization process.



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And now that we actually declared and defined our objects here inside of the class.



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Now we can actually go inside this and create Mefford.



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And here I want to create a listener for these Chatila.



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The result bottom so what is it.



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Listener listener allows the spot in to listen to some type of interaction so that whenever the user



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actually interacts with this button that listener is going to be notified.



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And it is going to actually do something according to the logic that we put inside a body of that listener.



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So let's go inside this man at uncreate Smurfit here and we can't say PTEN triangulate that sets unclick



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listener.



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And here inside the Frances's you are safe in here.



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You put the new key word here hold the shift key down on your keyboard and then present a little key



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on your keyboard.



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So now the autocomplete feature of Android studio is going to is going to show you this option it says



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Uncle Nicholas and her two curly braces and inside the curly braces you can see these dot dot dot.



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Choose this one and then press on until you and your keyboard.



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So the Android studio is going to actually put these codes automatically for you.



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So what is this.



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This is actually an anonymous inner class that implements the unclick class or interface and that and



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because that in NMC class implements that this unclick this in an interface the Smurfette here is actually



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also in the override that here it is put here.



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So you're going to master interfaces later in this course.



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But for now I just wanted to introduce you to the process of creating a listener for a specific user



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interface component in and.



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Right.



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But don't worry this is just the method here.



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This is an anonymous inner class an anonymous in a class doesn't have a name.



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It is actually anonymous.



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So for now just know that we have the method and this is going to be executed.



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This uncle Meffert is going to be executed whenever the user interacts with this calculated the result.



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But in an effort to use a potest is supporting this uncle Mfat here is going to be executed.



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Right.



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So let me show you how it is done.



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So for example I can actually change the background color of this takes view whenever they use their



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touches this and whenever the user interacts with this button.



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So here I can say TDX the result that sets background color.



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And here I can say.



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So hold down the shift key on your keyboard choose the color class start.



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For example I can change you to yellow.



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I can't change the background color of this.



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Th still is all too yellow and ever that user interacts with this button.



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So let's run the AF now.



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Let me show you the emulator.



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So now here if I click on the Spartan Now you can see that the background color of this takes is actually



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changed to yellow.



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Right.



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So hopefully that makes sense.



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Now let me comment out this line of code so that it is not going to be executed or you can actually



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delete it completely.



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So here inside is Uncle asked me if I can put the actual logic to the main logic of the application.



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We want to say that for example they use it and the percent and then we can say to use it we can actually



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allow the user to enter the number and then we can show the result.



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So for example if you want to get 50 percent 30 percent of the numbers for example 200 what is going



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to value what is going to be the result we want to get the 50 percent of that number two hundred.



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So the result is going to be out with it here in place of this result to take that view.



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So we want to get that value we want to do some calculations here some math stuff.



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Let's go inside this android studio that's going so it is unclear here.



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So here first of all we need to get the value the percent value which is going to be a numeric value



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right of this edit text.



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So whatever value is entered inside it it is going to be actually of type editable.



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We need to convert that value to our float values so that it is actually of type numeric a numeric value.



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Right.



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So for example disparity here that is entered here is going to be off the editable Vinita change.



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We need to convert this data type of this number to a float value so that it is actually a numeric type.



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And then we can do some calculations on that numeric type.



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So here inside is Uncle Fred.



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We need to create a variable of type float so we can say float and the name of this variable is going



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to be per cent per cent numeric



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value assignment operator.



202

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So here I just need to say float.



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So a class called float capital F dot parse float.



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And here we can pass our string value to this method and that value is going to be converted to offload



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value automatically by using this method.



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So inside this prentices here I can actually get the value of this as it takes I can say EDT purs it



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Itay enter percent thought get text Daut to strange so we got the text of this Enter person and we converted



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that value to a string value.



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And now this value is going to be converted to a float value by using this method and the result is



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going to be assigned to this variable per cent in numeric value.



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So let's put a semicolon at the end of the statement that it create a new line so that you can see what's



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going on here.



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There so now we need to divide this value that is Intel here.



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For example we have this person here 30 percent.



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Right.



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So even if you divide 30 by 100 in order to get that decimal value and then we can actually get the



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total result get the actual result.



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So here we have 80 percent numeric value right now.



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We need to divide this percent by 100 in order to get that this money value.



220

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So let's create another variable off that floats and the name of this value.



221

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But is this simn value assignment operator.



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So here we have these persons numeric values right.



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So I can't say a person's numeric value divided by 400 semicolon.



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So now that we have the decimal value here again I can create another variable of type float.



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And here I can say the name of this value is resolved.



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Assignment operator.



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So here now that we have this decimal value we can say this symbol value multiplied by.



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So here in order to actually get the result we have this decimal value right.



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So they use it as another value here.



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Inside these Edhi takes these EDT number actually EDT entry or number.



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So for example we want to get the first two percent of 200.



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Right.



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So there is all this this value is going to be multiplied by disvalue by the value that is entered here.



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Inside these edits this EDT enter number.



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So now we need to again say float thought parce float.



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And here we need to actually refer to our EDT enter number that get text that's too strange.



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So in this way we are accessing our edited her number and we write this in the text.



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And finally we are converting that takes to a string value.



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So we pass this value here to this parts.



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So it is going to be converted to a float value and the result is going to be multiplied by this value



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decimal value.



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So let's put a semicolon at the number statement.



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Let me create a new line here so that you can see what's going on here.



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The system will value is actually multiplied by disvalue.



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And here we have the result.



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So finally we can say here is the result that actually the said text.



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So in this way by calling the stakes we can actually send a text to this text result.



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Here let me show you the emulator.



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So here it is RTX the result.



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So th series of data takes.



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And here again because this is actually a float value.



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We need to convert that value to a string value because this set takes math it actually accepts us three



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valued not offloads value.



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If we pass a float value to the Smurfette our application is going to crash.



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So let's actually say that float that this time to save in here 2st.



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So we can pass a float value to the Smurfit and it is going to be converted to a string value.



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And then we can actually output that value to that screen.



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So that's it.



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Now we can run the app.



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Let me show you the emulator.



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So here it is the layout.



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So let's put that person here.



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So for example I want to get the 70 percent of the.



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For example number 300.



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Now let's click on these calculate the results button.



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So here it is the result.



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Two hundred and ten.



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That's it.



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So hopefully you have actually learned a lot in this lesson and I tried to show you everything that



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you needed to know in order to actually start creating Android applications in Android applications



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for the Android 8 platform.



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So we're going to add lots of applications lots of tutorials about creating production ready applications



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to the course.



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Stay tuned.



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If you have any questions please post the discussion in the course and then I'll do my best to answer



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all of your questions.



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Thank you very much for being a student of discourse and I'll see you in the next story on.