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So now I'm going to paste in some lines of code here.



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Inside is uncreate Meffert.



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And then I'm going to explain to you what's going on here.



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So as you can see here these are lines of code that I pasted here first about in line for 88.



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I want to I try to initialize this takes the bill amount object which is of the view that I declared



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in line 18.



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As you can see here.



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So to the amount.



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Assignment operator and then here I am actually testing this object to a text view object find view



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by id r that ID that 8:36 to be the mount.



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So I actually deferred to the ID of this the bill amount takes a.



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And here in line 39 am initialising 66 percent assignment operator error.



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Here I am casting this object which takes a few object find your way Id are that ID that 80 percent.



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And here we have this the tip assignment operator.



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Again I am casting this object which takes few object point view by ID or that ID that X the type.



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Here you have you are actually initializing this takes the total amount.



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And here again as you can see find your way Id are that ID that takes the total amount and in line 43



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here I am actually setting the text of this tip.



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So the tip that it takes and here inside Apprentice's of this text Mefford I actually referred to the



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name of this currency format value object as you can see here currency format value object data format.



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So it's going to actually format this value that we pass to this format Meffert despite the number 0



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and it's going to actually return a string value of that specific format that is specific to that locale.



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Here for example four different countries.



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It depends on the settings of the users the price that which actually which locale is actually used



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for that specific device.



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So it's going to actually turn up a specific value for that specific locale currency format value that



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format number 0 is going to actually return a string value.



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OK.



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And then add the total bill amount here that said text again I actually referred to the name of this



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currency for value object that form at number zero.



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Let's actually look at these lines of Cahir in line 46 I am initialising this TXI is safe.



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Percent.



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OK this is to say percent object which I actually declared here a line at twenty five as you can see



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here.



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So Th to say person assignment operator here I am casting this object to a text object find view by



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ID or that ID that is to say for ascent in line 4 to 7.



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I am actually initialized this takes the money saved object assignment operator takes you find view



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way id or ID that actually takes the money saved and in 949 I am actually setting the text of this 360



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the money saved.



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That takes the currency format value as you can see here again that format number 0.



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So that is actually on our project here in order to show you some of these changes on the screen on



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the emulator.



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So here as you can see our application is running on the simulator.



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And here you can see that the value of this tip is the tip as you can see here actually to set the text



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of the text to keep in line.



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Our first Iffley currency format that format number zero.



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So here you can see we have this value.



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So the locale of my emulator is actually us.



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So we have this dollar sign here dollar sign 0.00 which is actually at our table about you as you can



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see here and here I actually said this takes the total amount.



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This is the total amount.



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Again we have this dollar sign zero point zero zero and now we can see that 11:49 actually set the takes



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of this takes the money saved currency from value that format number zero.



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So here you can see this value dollar signs zero point zero zero.



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Right.



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So that's the job of this currency format value in order to actually give us the specific format of



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that is actually suitable for that specific locale.



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So hopefully that makes sense.



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And now we're actually pasting some more lines of code here inside this uncreate Mefford and then I'm



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going to explain to you what's going on here.



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So here inside this uncreate method before I actually add the logic.



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First let me tell you that first of all I want to actually add the logic in order to in order for this



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calculator to work.



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Okay.



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And then I add the logic for the savings calculator.



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Okay.



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First I want this tip calculator here.



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So now I'm going to paste in some lines of code here.



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As you can see here these are the lines of code that I pasted here in line 55.



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I actually created an object of type edit takes and the name of my object is the amount of the text.



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Right.



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So as you can see here these are the lines of code that I pasted here inline 55.



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I actually created an object of type editor.



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And the name of my object is EDT money amount.



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Right.



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Assignment operator and then here I Chastity's object to a test object find view ID or that ID that



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it is the money amount.



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So let's actually show you the application of the emulator.



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So here I am actually referring to this ID tastier and helping out here as you can see here it is the



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money amount.



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And now in 56 you can see something different here which you haven't seen so far.



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It's the money amount I actually referred to the name of this eddy takes object that add text change



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listener.



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OK.



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So I want to actually make this it it takes actually a listener.



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OK.



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A listener to what a listener to the changes that is actually happening on this editor.



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So if the user for example adds some values into these added text or if the user removes those values



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from the edit text or this edit takes here it's going to be aware of those changes.



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So here that's why I actually referred to the name of this edit text EDT money amount that ad takes



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to change the listener.



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So this edits is going to be the listener for those changes is going to actually listen to those changes



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that actually happened that actually occur inside these edit text.



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And it's great that that editing is going to be a of of a lot of those changes.



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And here I assign this value this is actually a handler.



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OK.



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That actually allowed this edit takes to be aware of those changes.



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So now we need to actually define this handler and then let's actually show you this line.



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Fifty eight.



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Here I am actually again creating an object of type search bar and the name of this object is sick but



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person's right.



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So here I am actually defining the search bar here an assignment operator here I am actually casting



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the object to a search object find your ID or that ID search bar percent.



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As you can see here I am actually defining this object here and in line 59 or is referred to the name



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of this Seeburg percent object that set on Skipworth change listener.



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So here I am 5:42 but a listener to actually these changes when they use it for example changes this



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value of these Sebald or when the user seeks on this Seaboard.



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This part is going to listen to those changes and then it's going to respond.



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So here I actually add this value here.



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This handler and Vinita defined his handler in our class.



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But as you can see the name of this handler is Tepes each part change the center.



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So this handle it is going to allow the search bar to be aware of actually of these changes.



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Right.



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Of actually seeking this the here.



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So first of all it's actually defined this a cheap ADT money amount it takes to watch her handler.



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So let's actually go inside this class after the end in calibrates of this and method.



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And inside the main activity class and what I'm going to actually pastings some lines of code here and



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then I'm going to explain to you what's going on here.



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So now let me actually define this handler here manually and then because I want to show you RDL actually



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a very important point.



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So now private's the access modify it up this handler is private.



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And this is actually a constant private final.



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And that data type of this handler is actually text Wotcher text Wotcher and the name of this handler



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is going to be the value that I put here.



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Tepe EDT money amount text whatever so I just copy this value here and paste it here.



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Assignment operator new text.



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And as you can see here as I actually typed t it the autocomplete feature of the Android studio is helping



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me to actually choose this text which are here as you can see.



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So just select it and press an interviewee on your keyboard.



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And now the Android studio Id actually put these lines of code here automatically.



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So first let me actually as you can see we have an error here and at the end of these this calibrates



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as you can see if you need to put a semicolon here and now the error is gone.



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And these are the methods that are actually put here by the Android studio.



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These are the same effects that we need to overwrite.



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So as I told you before when you actually create a handler or an interface you are actually creating



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an anonymous inner class here and that in a class is actually implementing this text watcher interface.



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Right.



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And as you can see here these are the methods that that in a class that anonymous class that we can



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see that the name of that class here that in a class is actually implementing these methods.



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And let me tell you that anonymously in all classes but actually classes without names.



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Right.



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So this class that actually have no names here is is actually implementing these methods that are actually



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related to the sponsor interface and here we can actually use these methods.



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First of all we have this Smurfit public void before text changed.



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So we're not going to use this method here in this application.



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And this is going to be executed before the value of this.



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For example let me show you on this emulator.



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This Meffert this before text change here is going to be executed before they use it as any values to



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these it takes here all the use that is about to add an R values to these inside these edit text.



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So we're not going to use this method here and we have an exchange.



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So this method is going to be executed when the user is actually adding or removing values into these



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edit text.



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As you can see here.



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So this is the method that you're going to work inside our application.



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This is a very important Smurfette and we need to use this method.



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And we are going to actually put our logic inside the Smurfit and the last it is the Smurfette after



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text changed.



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So this is going to be executed after the values of these tests actually changed.



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Finally and we can actually put a logic here in order to execute.



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But the most important method here is the Smurfette on takes changed.



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So let's actually go inside the Smurfette and now I'm going to paste in some lines of code here.



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Inside the Smurfette and then I'm going to explain to you what's going on here.