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So now let's actually go to our Android studio and here let me actually double click on this tab here



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in order to make this area wider here.



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So now I want to actually get the value of this key.



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Let's go to our web browser and here we have the school here right.



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So let's change this value here to for example.



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This is a value to and here as you can see I changed the value of this key.



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Right.



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So now I want to get the value of this key.



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So let's go back to an android studio and now here.



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After the end in apprentices of this the listener here at value listener for this key as you can see



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I want to actually create an orderly center for another key.



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Right.



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So now here still I am actually inside this uncle listen at here Uncle unclick my fate here as you can



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see.



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And now this block of code here is actually related to Diski.



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I created actually an add value listener for this key right.



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So now I want to actually create another add value listener for another key.



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So after the end in practice here of this listener as you can see so just typing firebase database firebase



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database does get the reference.



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And now I need to specify the reference so inside the double quotes.



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Let's actually go back to our web browser here.



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As you can see we have this here.



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So just select this key here as you can see this is our key right here you can enter the cockpit is



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key.



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So just highlighted here and then just right click on it and then click on copy.



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So now that I actually copy this key here let's actually just click on this link here.



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In order to see the whole database here.



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So let's go back to Andrew with you.



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And now I can actually paste that key here.



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Right.



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And here I can say that as you can see here adds value in it.



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So now let me actually create a new line here and here I can say that add value event listener.



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Right person until you on your keyboard and then just put the new key word here and then hold the shift



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key on your keyboard.



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And then just put it like capitalized to the letter here and now you can select this option and in person



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it'll be on your keyboard.



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And now the autocomplete feature on Android studio is going to put these lines of code here for us.



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And then as you can see here we have this error here and we need to put a semi-colon after the end in



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Prentice's here.



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Right.



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And now we have two methods.



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The first one is on data change and the second one is uncancel.



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Right.



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So I told you that this method on data change is going to be called of when ever we actually click on



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the spot in get data from server PTEN get data from server and it's going to actually also be called



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when ever we change the date of that key.



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So for example here as you can see we have this key here right and now if I show you the emulator and



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let's actually click on the spot and get data from server as you can see we got this data.



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This is a value right.



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So now this value is actually the value of this and to the cheat.



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So let's actually change this value to another value.



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Let's see what happens.



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And here I can say for example some value right and then press on intel on your keyboard.



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And now as you can see here I changed the value of this key right.



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So now this value is also changed inside our emulator some value.



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So that on the top change method is actually called an error that you actually change the value of your



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key.



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Right.



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So let's actually change it to another value for example.



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We can actually just type in here my value enter and now it says my value as you can see here.



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So now let's go back to android studio.



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So here I created a listener for this key right for this key.



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As you can see here.



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So now inside the update or change method as you can see I can just type in here.



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Streambed



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And here again value assignment operator and here in order to get the data as you can see we have this



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argument data snapshot.



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So this argument actually holds the value of this key.



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So here I can see data snapshot right data snapshot that gets value semi-colon and here I need to specify



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the data type.



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So inside the practice's I can just say strange thoughts.



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Class right now I can just print that value here.



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So here let's actually create a log.



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So log.



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That's right.



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And first of all I need to specify that right.



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So just put two double quotes here and then just type in here t a g tank comma and then here I can't



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put the value here value and then semicolon.



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So now let's actually just run our project and now let me actually just show you the web browser and



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then let me show you the emulator here.



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So now I want to click on the spot and get data from server.



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First of all we have this value here right.



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But the value of this second key as you can see here is going to be logged here to the console.



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So let me show you the Android studio and here at the bottom click on Android monitor and here as you



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can see we have this search here the search bar just typing here THG as you can see.



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And now as you can see here in the console we have this value.



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This is a value to.



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Right.



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So this is the value of this key.



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So here I can just delete this value.



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And here I can say this is my own value right.



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And that person enter key on your keyboard.



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And now if I actually go to Android Studio inside the lug you can see this value.



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This is my own value.



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So if something in order to actually clear the logjam here you just need to click on the spot in here



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right to left right.



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Clear like that.



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And now as you can see here we have nothing here.



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So now let's actually change this value again.



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00:06:32,830 --> 00:06:35,770

So here I can for example say number 100.



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And that person the key on your keyboard.



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00:06:38,440 --> 00:06:42,710

And now if I go to the live chat here let's see what happens.



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So as you can see here nothing happened.



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00:06:45,190 --> 00:06:46,500

Why.



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00:06:46,510 --> 00:06:53,880

Because of he said that the value that we are going to get from these key is going to be us think value.



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Right.



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00:06:55,690 --> 00:07:00,430

So now let's see how we can actually get an integer value from the database.



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00:07:00,450 --> 00:07:04,750

So as you can see here let me show you the web browser as you can see if you have here an integer value



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00:07:04,750 --> 00:07:05,320

right.



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00:07:05,320 --> 00:07:09,840

So now I want to get an integer value not and think value right.



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00:07:09,910 --> 00:07:11,990

So not our string value.



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00:07:12,010 --> 00:07:18,940

So let's go back to our Android studio and here I can actually create a variable so it and the name



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00:07:18,940 --> 00:07:19,900

of my variable.



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00:07:19,900 --> 00:07:23,040

As you can see I am in status on data change method here right.



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00:07:23,230 --> 00:07:31,540

Inside is Uncle I value listener here for this key so he can say it and the name of my else can be in



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00:07:31,670 --> 00:07:33,080

value right.



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00:07:33,340 --> 00:07:34,810

Assignment operator.



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And then here I can refer to the name of this data or snapshot here.



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00:07:38,350 --> 00:07:41,020

This argument does get value.



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00:07:41,440 --> 00:07:46,830

And inside Apprentice's because this is actually an integer value that you want to get inside Apprentice's



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00:07:46,840 --> 00:07:49,740

I need to say integer class.



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00:07:50,080 --> 00:07:54,710

And then at the end of my code at the end of my statement I need to put a semicolon.



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00:07:55,030 --> 00:07:56,830

And here I can say log.



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00:07:57,400 --> 00:08:00,880

That's why I'm here for the first argument.



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00:08:00,880 --> 00:08:03,350

I need to specify the tag which is of type streams.



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00:08:03,510 --> 00:08:10,120

So tired come up and for the second value which is actually an integer value I need to refer to the



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00:08:10,120 --> 00:08:18,820

name of my variable into value plus two double quotes because the second value is going to be must be



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00:08:18,820 --> 00:08:19,970

actually of type string.



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00:08:19,990 --> 00:08:27,340

Here we need to convert these Vadi disvalue integer into value twice think value so that we can actually



130

00:08:27,340 --> 00:08:33,940

put it here and now because we want to actually get an integer value from the database we need to comment



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00:08:34,000 --> 00:08:38,400

out these two lines of code here because we don't want to get a string value.



132

00:08:38,410 --> 00:08:40,520

You want to get an integer value right.



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00:08:40,750 --> 00:08:45,270

So now here at the bottom it's actually clear the law can't.



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00:08:45,510 --> 00:08:47,280

Let's actually run our project now.



135

00:08:50,130 --> 00:08:56,030

And now let me show you the web browser and the emulator and here as you can see I just click on the



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00:08:56,030 --> 00:08:57,980

spot and get data from server.



137

00:08:58,150 --> 00:09:00,830

And as you can see here this is the first value for this key right.



138

00:09:01,000 --> 00:09:04,560

And the value of the second key is going to be locked to the console.



139

00:09:04,630 --> 00:09:10,820

So let's go back to what I understood you in the in the Luczak here you can see this value number 100.



140

00:09:11,770 --> 00:09:18,150

So now instead of outputting this value to the log it's actually just put it to the user interface.



141

00:09:18,430 --> 00:09:27,400

So here I can see the value that set text and here I can just refer to the name of this value and the



142

00:09:27,400 --> 00:09:33,040

value of this variable into value is going to be replaced by the previous value which is actually the



143

00:09:33,040 --> 00:09:35,550

disvalue right the value of this thing value.



144

00:09:35,560 --> 00:09:40,800

But because we are calling this method that takes on this takes the value again here.



145

00:09:40,990 --> 00:09:44,670

So here I can say that it's value.



146

00:09:45,220 --> 00:09:50,470

But because this is actually as an integer value and we need to actually provide a string value for



147

00:09:50,470 --> 00:09:56,740

this method it takes that actually converted to our actually think value by concatenating this value



148

00:09:56,950 --> 00:09:58,390

to an empty string value.



149

00:09:58,600 --> 00:10:03,590

So let's actually again run our project and now let me actually opened a web browser.



150

00:10:03,850 --> 00:10:06,100

And here this is our emulator.



151

00:10:06,100 --> 00:10:09,550

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



152

00:10:09,740 --> 00:10:13,960

And now we have this value 100 right as you can see.



153

00:10:13,960 --> 00:10:17,900

So now let's actually get the value of this key.



154

00:10:17,920 --> 00:10:20,380

As you can see this is actually a category right.



155

00:10:20,490 --> 00:10:24,770

Let's get the value of this up key child here.



156

00:10:24,940 --> 00:10:26,610

So let's go back to our Android studio.



157

00:10:26,660 --> 00:10:29,680

Again we need to actually create a listener.



158

00:10:29,770 --> 00:10:31,350

So let's see how we can do that.