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Let's actually learn our project here.



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So just click on this button here and now it's going to run our application here.



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So now let me show you the web browser here.



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And here is our web browser here.



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And now let me show you the emulator.



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So now let me check here.



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Now as you can see it is actually luncheonette application.



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And here it is saying that instead Thrun applied code changes and restarted the app.



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So now our application is ready.



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So now let me show you the web browser and the emulator.



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So now I want to specify the computer name right.



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So here I can see that my computer name is iPhone iPhone for example 5.



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Right.



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And the computer power is one example of one thousandth the computer's speed is 2000.



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The computer room is five thousand as you can see here.



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And computer screen is retina touch screen



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screen as you can see here touch screen computer keyboard is virtual here.



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I can say for example virtual keyboard right virtual keyboard.



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And now let me make this cheap virtual keyboard here actually disappeared.



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We have the computer CPO So here I can say Apple C.P. you right.



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So now as you can see here we have these data and here as you can see the text of this button is produced



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in your computer and sent it to server.



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So you already know why this text is here because let's go to Android studio.



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As you can see here inside this uncreate Smurfette Let me show you the angry at me.



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This is our uncreate method right.



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And here as you can see we put this line of code here to change the text of send or update button.



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According to the situation.



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So this uncreate Meffert here is going to be actually called when the user actually opens the application



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right.



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And now as you can see here it's going to actually look at this line of thought here and it's going



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to execute the Smurfit.



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So now let me actually hold the comment here on my keyboard.



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And if you are using a Windows machine you need to actually just hold the control on your keyboard and



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then click on this line of code here.



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This method as you can see now as you can see here this is our Meffert right.



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Private's will it change the text of send or update button.



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According to the situation and it's going to actually look at the value of this unique computer I.D.



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It's going to check that this barrier is actually empty or not if it is empty then it's going to actually



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set the text produced in your computer and send it to server.



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So as you can see here this is that value and that that means that the value of this unique computer



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ID now is empty.



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Right.



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And if it if it is not empty then it can actually be said this text here modified to produce computer



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data.



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So now let's actually click on this button.



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Now as you can see here as you can see here the text fields are empty.



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Now let's go to our web browser and here you can see that the data is on here.



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Right.



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So here we have these computers category.



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So I told you about this computers category.



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Right.



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Because let's go to our Android studio.



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As you can see here inside our uncreate Smurfette here in line number are actually in line number six



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the eight as you can see.



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You referred to this database reference assignment operator.



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And then I refer to these firebase database instance.



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So let me show you the web browser.



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So this is our firebase database instance right.



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This is our firebase database instance that gets reference so now I want to actually get a reference



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to the computers category.



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So we created this chattily computers category and then we clicked on their produce and and you actually



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computer object right.



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So let's look at our Mefford produce in your computer object.



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So as you can see here let's find RMF So this is RMF it produce a new computer and put it in the database.



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So when I clicked on this on this button as you can see here and at the takes of this button is modified



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to produce the computer data.



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So now we can actually update that data.



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But now when I first click clicked on the spot and when I actually hear the computer data.



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And and first clicked on this button first it actually executed this method produce in your computer



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in the database and put it in the database as you can see here for this kind of Chafer that this up



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this unique computer ID value.



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But it's actually actually empty or not if it is empty then it's going to have the same effect here



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and it's going to create our Random unique ID right database that the database reference that push.



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So this piece of code here is going to actually create a random unique ID in the day in the firebase.



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So now let me show you the web browser as you can see here.



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Inside this computers category we have this random unique ID.



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Right.



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So that's the job of this piece of code here.



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Database reference that push right this unique ID and then we call the gate key.



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So it's going to actually get this value and assign it to this unique computer I.D. because of tapes



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3.



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Right.



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And then it's going to create a computer object with the values that we pass to the Smurfette so we



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pass these values.



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For example the computer is Apple's CPQ right.



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He created these values.



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These values for this object.



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And here now we have this object.



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And here we said database reference.



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So this database difference now is actually referring to these computers category right.



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And here we are saying that child unique computer ID.



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So here we are referring to this.



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And here you are saying that set value computer.



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So it's going to actually treat this idea as a category because we are actually sitting on an object



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to this child.



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So it's going to actually pro-white keys and values according to the actually the names of the instance



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variables of this object.



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So let's go inside our computer class as you can see here we have this instance variables inside this



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class.



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Look at these kids here for example computers CPQ.



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Right.



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So let's find the computer see you here as you can see it's going to look at this value computer spew.



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And it's going to put it as the key as it can here as the key of our value app LCP you right.



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It's just the same key.



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Or for example look at these key computer keyboard as you can see here.



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Now we have this the name of this instance valuable as you can see here.



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This is the same or computer name.



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Here we have computer name or there for example computer power.



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Here we have computer power or for example a computer up speed here.



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Here we have computers speed or computer RAM.



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Here we have computer RAM and so on.



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Right.



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So let's go back to human activity of a fight as you can see here.



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We set our objects to produce ID and then as you can see here it actually treated this key as the category



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and put these keys and values here.



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Right.



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And here it's got it actually changed the text of our button as you can see here.



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Now the text of this button is changed.



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Right.



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Why.



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Because now this unique computer ID is not empty.



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Right.



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So this unique computer ID now has a value.



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So instead it's going actually up there so you actually click on this button again.



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So now let's actually go inside our uncreate method here.



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Let me show you that here Betty and sent or updated data right.



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That's listener first that first.



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When we click on the spot in as you can see it's going to get the values of these take the texts and



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it's going to assign them to these other variables.



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And it's going to execute these lines of code here and then it's going to actually look at these IIF



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statement here at this if else statement.



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And it says it takes utility that is into your computer ID.



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So now as you can see here because you can get your computer ID has value.



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Now this expression here evaluates to false.



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Why.



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Because you need a computer ID is not empty this valuable unique computer ID has a value has a value



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right.



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So there's a solution here evaluates to false and it's not going to execute this statement.



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Instead it's going to execute this.



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Else they meant and it's going actually be modified to produce the computer here.



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Right.



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Modified to produce a computer.



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And here I can actually update that actually the values the date of my computer.



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So for example as you can see here we called the Smurfette and we passed the computer name power speed



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RAM screen keyboard Seip you get these values from these texts.



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So let's actually go to our web browser here.



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And now let me show you the emulator here.



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So this is our emulator and this is our web browser right.



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So now for example I decide to actually change the value of my computer speed.



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So as you can see here.



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Let's let's look at our computers here.



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This is 2000 right.



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Let's change this value to for example of 5000.



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Right.



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So now let's just click on this button modified to produce computer data.



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And now it's going to actually update the value of this computer speed.



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Right.



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So let's for example change the name of my computer to for example iPhone 4 iPhone 4.



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Right.



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So now I want to update the name the name of my computer.



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I don't want the iPhone 5 s for example I want this iPhone 4.



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So let's click on this button here modified to produce computer data and now it says iPhone 4 or here



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we can also say for example galaxy Galaxy 5.



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And then if you click on this button again now again it's going to update the name of my computer or



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here I can say for example physical and physical keyboard.



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And then if I click on this button here.



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Now as you can see here this data is actually updated.



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So hopefully that makes sense.



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And now that we actually since these data to the server we have these objects right with this ID.



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Now I want to get this data from the server.



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So let's actually click on the spot and get data from server.



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And now you can see these data here.



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Right.



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We successfully got this data from the server.



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So for example as you can see here these text view is actually inside a horizontal scroll view.



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So that's why you can see that I can actually scroll here to the left or right.



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In order to see the values and it says computer name is Galaxy 5 dash computer power is 1000 dash computer



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speed is 5000.



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As you can see here the computer that is 5000 computer screen and these values here.



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Right.



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So let's actually change for example change the computer name here.



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Now let's see that how this actually is going to be updated.



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So let's change the computer name here.



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For example I can't say that I want my computer name to be for example matchbooks pro MacBook Pro.



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Right.



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And now if I actually press on until here on my keyboard as you can see here these values must be inside



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to double quotes because this is going to be a stunning value.



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So here I have a MacBook Pro and in-person interview on your keyboard.



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And now let me show you the the emulator here and here it is saying that the computer name is Mac which



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pro it has successfully got the data from the server.



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So when I change the data here it's going to also change this data here so we can also update data here.



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For example I can say that the computer for example the computer you should be for example code I-78



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core is 7.



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So now if I click on the spot in here I'll modify it to produce the computer data.



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As you can see here now here the computer name is Galaxy 5 because we actually passed this value as



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the computer name the computer's speed is 5000 here.



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As you can see and the computer CPO Let's actually scroll to the left as you can see the computer is



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called Seven.



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So when you update these data here these data and I actually get this data from the server.



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These data are also going to be updated.



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Right.



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This is very fast.



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A firebase is the best backend if you want to actually create applications that use that needs to be



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actually connected to the server which is the best.



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This is very fast.



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So now for example if I actually want to just just let me actually close this application here for example.



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Now I want to close this application here and this one and this one right.



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So now let's actually run our application again.



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So the name of our application was absolutely for right.



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And now as you can see here again when we actually run our application here the value of our let me



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go to our Android studio.



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The value of our valuable Junichi computer ID again it is actually empty right.



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So then I actually want to create another instance.



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So let me show you the web browser and this one.



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So this actually create another computer for instance.



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So the name of my computer this time is for example Windows Windows PC.



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Right.



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And the computer power is 2000 computer it is 3000 Computerland is 4000 right.



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The computer screen is for example touch screen touch screen the computer keyboard is for example virtual



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and the computer is called I fight.



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For example quote I fight.



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And now if I click and click on this button here let's see what happens.



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Produced in your computer and send it to server right.



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And now it's going to actually create another instance and other ID inside these computers category.



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Right.



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And here as you can see we have these data computers C-p you call like five virtual computer keyboard



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a computer keyboard is virtual computer name is Windows PC computer.



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However it's 2000 computer Ramey's 4000 computer screen is touchscreen and the computer speed is 3000.



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And now let's click on the spot and get data from server.



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And now we get that data of this instance.



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Right.



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Computer Name is Windows PC computer power is 2000 and all these data.



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Right.



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So you can scroll and see all these.



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So I think that's it.



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And now we can actually figure out how to actually send data to the server and to how to update it how



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to get it to get data from the server.



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And if we're going to actually create more and more applications and connect them to our firebase database



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in order to learn more topics in order to learn more concepts about using firebase as the backend about



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applications.



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For now just this is enough and if you have any questions about these concepts that I taught you please



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post the discussion in the course and then I'll do my best to answer all of your questions.



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Thank you very much for watching and I'll see you in the next year Tauriel.