1

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So now are we to actually create our difference to our database in firebase.



2

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So how we can do that.



3

00:00:07,680 --> 00:00:15,780

So in order to actually learn how to actually send data to the database in firebase First we need to



4

00:00:15,780 --> 00:00:17,470

actually read the documentation.



5

00:00:17,520 --> 00:00:17,980

Right.



6

00:00:18,120 --> 00:00:22,940

So let me actually open the browser here and here.



7

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Just click on this overview here.



8

00:00:24,940 --> 00:00:25,420

OK.



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00:00:25,470 --> 00:00:31,500

Or you can actually click on firebase or you can actually just open another tab and then go to the firebase



10

00:00:31,830 --> 00:00:32,850

website.



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So here I'm going to click on this or that of you here and now as you can see here we have these actually



12

00:00:41,250 --> 00:00:50,070

these tutorials and these are actually the documentations that we can use in order to learn to actually



13

00:00:50,070 --> 00:00:51,680

work with the firebase.



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00:00:51,720 --> 00:00:56,370

So because we want to actually work with the database as you can see here we have this database here



15

00:00:56,550 --> 00:01:02,670

and it says store and simple data in real time across all connected clients.



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00:01:02,670 --> 00:01:07,030

So here just click on this little more here click on it.



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And now we are guided to the documentation.



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00:01:09,750 --> 00:01:10,370

Right.



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00:01:10,380 --> 00:01:16,820

Or I can actually click on this firebase here at the top left and then as you can see this is the virus



20

00:01:16,860 --> 00:01:17,880

Web site.



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00:01:18,090 --> 00:01:24,900

And now this is actually the initial page that is going to be shown to you when you actually open the



22

00:01:24,900 --> 00:01:27,040

file by Smith firebase website.



23

00:01:27,060 --> 00:01:30,090

And now at the top you can see it says Ducs right.



24

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I can click on the stocks here and then as you can see here we have firebase firebase by platform and



25

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then here just click on this get started.



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Got it.



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And here as you can see this is actually firebase documentation.



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And now as you can see here we chose Android.



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Right.



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00:01:48,720 --> 00:01:57,270

And here click on these real time database here and then click on get started as you can see here.



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Just click on this get started.



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So realtime database Android gets started right.



33

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And then here it says that you need to connect up to firebase.



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So we already connected up to fire rates and we add the he added the real time database to our application.



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So as you can see here we actually configured the database rules.



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OK.



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As you can see we actually can figure out the database tool.



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So let let me open this tap here and if I click on this database here and then if I click on the rules



39

00:02:29,940 --> 00:02:33,920

tab here you can see that we actually configured the database route.



40

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So we actually allow the users that are not authenticated to use this database.



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Right.



42

00:02:40,350 --> 00:02:42,930

But using this double equal operators here.



43

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Right.



44

00:02:43,830 --> 00:02:46,490

So let me ask you to open this up here again.



45

00:02:46,560 --> 00:02:50,310

And now it's time to write data to the database.



46

00:02:50,310 --> 00:02:50,950

Right.



47

00:02:51,360 --> 00:02:57,180

So now it says that to retrieve an instance of your database using to get instance.



48

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So first of all we need to actually get an instance of our database.



49

00:03:01,260 --> 00:03:06,280

This is the first step and reference the location you want to write to.



50

00:03:06,570 --> 00:03:08,330

So first we need to get the instance.



51

00:03:08,370 --> 00:03:13,580

And then if we need to actually get the reference to the location we want to write to.



52

00:03:13,710 --> 00:03:15,360

So let's see how we can do that.



53

00:03:15,360 --> 00:03:20,530

First of all as you can see there is a comment here and it says write a message to the database.



54

00:03:20,660 --> 00:03:21,440

Right.



55

00:03:21,690 --> 00:03:24,480

And it says firebase database.



56

00:03:24,510 --> 00:03:27,480

So here it is actually creating a variable.



57

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And the name of this variable is database right.



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Did they touch type of this variable is firebase database and then it put an assignment operator here.



59

00:03:38,370 --> 00:03:44,130

And as you can see here it actually referred to the name of this firebase database here firebase database



60

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that instance.



61

00:03:46,080 --> 00:03:52,800

So it actually refers to the name of this firebase database class and called the Smurfette get instance



62

00:03:52,860 --> 00:03:54,300

on this class.



63

00:03:54,300 --> 00:03:54,790

Right.



64

00:03:54,810 --> 00:04:00,660

So in this way we can actually get an instance of our database and we can assign that instance to our



65

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variable which is of type database which is of type firebase database and its name is database so these



66

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database here now holds an instance of their firebase database.



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So let's actually first of all let's just copy this line of code here.



68

00:04:17,970 --> 00:04:25,500

And let's actually open the Android studio and now let's actually first inside these uncreate Mefford



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we can actually just paste this line of code here.



70

00:04:28,830 --> 00:04:34,440

So now as you can see we have actually an instance of the firebase database.



71

00:04:34,440 --> 00:04:35,890

So this is the first step.



72

00:04:35,940 --> 00:04:36,310

Right.



73

00:04:36,330 --> 00:04:51,860

So now let me create a comment first so that for writing data to database.



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00:04:52,210 --> 00:04:52,850

Right.



75

00:04:52,900 --> 00:04:54,320

So this is the first step.



76

00:04:54,400 --> 00:04:58,400

And now let's actually open our web browser again here.



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00:04:58,480 --> 00:05:05,470

It says that we need to actually get a reference here as you can see we need to get a reference to the



78

00:05:05,470 --> 00:05:09,030

actually location that we want to write to.



79

00:05:09,100 --> 00:05:09,760

Right.



80

00:05:09,760 --> 00:05:12,700

So now let me actually open this tap here.



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00:05:12,700 --> 00:05:16,280

Firebase concert and click on the state tab here as you can see.



82

00:05:16,600 --> 00:05:21,970

And now as you can see if you have this up actually this is our fiber's instance right.



83

00:05:22,510 --> 00:05:27,220

And we just want you to get a reference to the location that we want to write to.



84

00:05:27,220 --> 00:05:34,870

So first let's actually open these tab here and now as you can see it actually created a variable of



85

00:05:34,900 --> 00:05:38,210

type database reference and its name is Mailer.



86

00:05:38,530 --> 00:05:45,340

And then it put for an assignment operator here and then it referred to the name of this database instance.



87

00:05:45,370 --> 00:05:49,650

So database that gets reference right message.



88

00:05:49,930 --> 00:05:58,710

So first let's actually go inside our Android studio and now we want to actually get our reference to



89

00:05:58,710 --> 00:06:00,820

the location that you want to write the data.



90

00:06:01,080 --> 00:06:05,980

So the data type is going to be database reference as you can see here right.



91

00:06:06,000 --> 00:06:12,450

So I can just type in database reference and the name is going to be my ref.



92

00:06:12,720 --> 00:06:17,910

As you can see here so that the same name here you can actually name it up in other names.



93

00:06:17,910 --> 00:06:24,660

You can actually give it another name but I chose this name here myself and then I put an assignment



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00:06:24,690 --> 00:06:25,910

operator here.



95

00:06:25,980 --> 00:06:26,540

Right.



96

00:06:26,760 --> 00:06:33,740

And then I refer to the name of this database instance that I created in number 25 dot.



97

00:06:33,960 --> 00:06:39,660

So now you can see here we have some if it's right or you want to choose this method gets reference



98

00:06:39,840 --> 00:06:43,220

from you l right through a fence.



99

00:06:43,380 --> 00:06:47,950

So just select this method here and then person enter key on your keyboard.



100

00:06:48,610 --> 00:06:56,340

And now inside Apprentice's as you can see it says that we need to actually put on not Knol screen value.



101

00:06:56,530 --> 00:06:59,310

So we need to put up two double quotes here.



102

00:07:00,230 --> 00:07:01,900

And inserted double quotes.



103

00:07:01,910 --> 00:07:03,300

We need to put a u r l.



104

00:07:03,410 --> 00:07:07,130

So what is that you are less actually open the web browser again.



105

00:07:07,370 --> 00:07:09,690

And let's click on this tab here.



106

00:07:10,340 --> 00:07:12,090

And as you can see here we have this.



107

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And here.



108

00:07:12,830 --> 00:07:19,470

So just click on it you are here and let's click on it and then click on copy right.



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00:07:19,490 --> 00:07:23,780

Or if you are using a Windows machine you can actually hold the control key and then press on the letter



110

00:07:23,900 --> 00:07:25,090

c key and your keyboard.



111

00:07:25,160 --> 00:07:29,960

And if you are using a Mac you can actually hold the comment here and then press on the leaders key



112

00:07:29,960 --> 00:07:35,750

on your keyboard and then now that we have actually copied this you Arel It's actually open the Android



113

00:07:35,760 --> 00:07:38,120

stood you again and inside double quotes.



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00:07:38,240 --> 00:07:44,630

Just paste this value right and then put a semicolon at the end of your statement.



115

00:07:44,660 --> 00:07:51,950

So now we actually got a reference to our location that we want to write the data and that location.



116

00:07:51,950 --> 00:07:54,350

Is this actually this you are.



117

00:07:54,360 --> 00:07:55,560

All right.



118

00:07:55,580 --> 00:08:02,030

So now if I click on this you are on here and if I actually for example add another radio for example



119

00:08:02,060 --> 00:08:11,500

person persons and they can go as you can see now it says that we have inside this database.



120

00:08:11,570 --> 00:08:14,330

We have this person's right.



121

00:08:14,420 --> 00:08:16,830

This is the location that we can actually write our data.



122

00:08:17,030 --> 00:08:17,450

Right.



123

00:08:17,630 --> 00:08:23,740

So now let me actually just delete this persons here and then click on go.



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00:08:23,750 --> 00:08:29,950

So here we have this instance box 38 or dash C 59 D-B colon null.



125

00:08:29,960 --> 00:08:31,350

And it says The value is null.



126

00:08:31,400 --> 00:08:33,410

So this is the key as you can see here.



127

00:08:33,410 --> 00:08:38,870

Disvalue is the key and this value is that we have no value right.



128

00:08:39,050 --> 00:08:42,430

So now if I click on it nothing happens right.



129

00:08:42,440 --> 00:08:45,540

So as you can see here we have this plus button.



130

00:08:45,830 --> 00:08:48,320

And here we have this delete button right.



131

00:08:48,600 --> 00:08:53,480

And if I actually hover over this plus button here it says add child.



132

00:08:53,510 --> 00:09:00,900

So let's click on it and now it says that you can actually just create a name of value.



133

00:09:00,950 --> 00:09:07,640

So as you can see here let me actually click on this delete button here delete button here and now if



134

00:09:07,640 --> 00:09:15,410

I click on the plus button here it says that we can actually add a child to our database instance right.



135

00:09:16,380 --> 00:09:22,040

So now if I actually click on it we can actually add a child so what it's going to be the key.



136

00:09:22,380 --> 00:09:30,550

So the name is going to be for example the name is going to be box or name.



137

00:09:30,570 --> 00:09:31,310

Right.



138

00:09:31,350 --> 00:09:34,050

And I must actually put a value here.



139

00:09:34,140 --> 00:09:36,270

So the value can be for example.



140

00:09:36,270 --> 00:09:43,790

So now let me add this extra W so the value can be for example my Buxar.



141

00:09:43,830 --> 00:09:45,000

So this is the name right.



142

00:09:45,000 --> 00:09:45,880

This is the value.



143

00:09:46,080 --> 00:09:51,460

And if we click on this ad here now we have a child here.



144

00:09:51,740 --> 00:09:57,860

And it's key is box name and it's value is my boxer right.



145

00:09:57,870 --> 00:10:01,480

I can actually create another child as you can see here.



146

00:10:01,490 --> 00:10:03,410

I can actually create an adult child here.



147

00:10:03,410 --> 00:10:14,010

So if I click on it and here I can say for example Boxer for example power and the value can be for



148

00:10:14,010 --> 00:10:18,080

example of one thousand or ten thousand and click on.



149

00:10:18,670 --> 00:10:26,100

And now we have another child as you can see here and it's in it's KEAYS box of power and its value



150

00:10:26,100 --> 00:10:27,250

is ten thousand.



151

00:10:27,510 --> 00:10:34,060

Right so now as you can see here the value here is of type string.



152

00:10:34,100 --> 00:10:37,720

And the value here is of type integer right.



153

00:10:37,820 --> 00:10:47,580

So now if I click on this up plus here and now I can actually create another category in order to hold



154

00:10:47,820 --> 00:10:48,970

the kickboxers.



155

00:10:49,140 --> 00:10:54,680

So for the name I can just type in cheek boxers right.



156

00:10:54,690 --> 00:10:55,020

Here.



157

00:10:55,050 --> 00:11:01,050

I don't want to assign a value because this is going to be a category that I can actually contain the



158

00:11:01,320 --> 00:11:03,040

values of the kickboxers.



159

00:11:03,180 --> 00:11:06,450

So and here as you can see we have this A-plus right.



160

00:11:06,480 --> 00:11:13,200

Just click on it at child and now as you can see here we have a category that can actually contain the



161

00:11:13,200 --> 00:11:14,370

other values.



162

00:11:14,370 --> 00:11:20,100

So for example teach boxers and the name is going to be for example that she is going to be kickboxer



163

00:11:21,780 --> 00:11:29,960

name and the value can be the value can be for example my Keech boxer.



164

00:11:32,220 --> 00:11:32,700

Right.



165

00:11:32,790 --> 00:11:35,000

And then I can click on that.



166

00:11:35,040 --> 00:11:40,540

So here as you can see we have actually another chapter called The kickboxers that can actually hold



167

00:11:40,560 --> 00:11:42,700

this child kickboxer name.



168

00:11:42,750 --> 00:11:44,080

And this is the value.



169

00:11:44,430 --> 00:11:49,730

And in this way we can actually create lots of children and lots of parents.



170

00:11:49,770 --> 00:11:57,210

It doesn't really matter how you manage the database it just depends on your own actually a way of structuring



171

00:11:57,210 --> 00:11:58,040

the database.



172

00:11:58,140 --> 00:11:59,040

Right.



173

00:11:59,070 --> 00:12:06,360

So for now just look at this structure as you can see we can actually say we can do the same thing that



174

00:12:06,360 --> 00:12:13,410

we did here from our Java code inside our Java code by writing Java code so we can do the same thing



175

00:12:13,410 --> 00:12:13,990

here.



176

00:12:14,220 --> 00:12:15,540

So let's see how we can do that first.



177

00:12:15,540 --> 00:12:17,570

Let's actually delete these values here.



178

00:12:17,790 --> 00:12:23,100

As you can see if I click on the delete button of window opens and then you can actually click on it



179

00:12:24,300 --> 00:12:29,440

and then there's actually did it this one and then delete this one right.



180

00:12:29,490 --> 00:12:32,400

So now we have only this instance right.



181

00:12:32,430 --> 00:12:34,160

This is going to be the patent.



182

00:12:34,440 --> 00:12:39,430

And now this actually you can actually call this also a root.



183

00:12:39,480 --> 00:12:40,800

Right.



184

00:12:40,800 --> 00:12:43,640

Let's actually go to our Android studio.



185

00:12:43,830 --> 00:12:50,810

So now that we have actually an instance of type database and now that we have a reference to actually



186

00:12:50,820 --> 00:12:53,820

did the location that we want to write the data.



187

00:12:54,290 --> 00:12:56,380

Let's actually open our web browser again.



188

00:12:56,520 --> 00:12:58,000

And let's actually open this.



189

00:12:58,100 --> 00:13:05,900

Let's actually just open this tap here again and now it says my if so this is the first step might if



190

00:13:05,900 --> 00:13:06,980

that set value.



191

00:13:06,990 --> 00:13:08,120

Hello voting.



192

00:13:08,520 --> 00:13:14,400

So now let's actually copy this line of code here and let's get you to go inside our Android studio.



193

00:13:15,390 --> 00:13:21,050

And inside the unclick listener of this button I want the data to be returned to the database when the



194

00:13:21,050 --> 00:13:22,400

user clicks on the button.



195

00:13:22,400 --> 00:13:28,730

So inside the uncle listen of the database as you can see here in say the uncle Smurfette of there is



196

00:13:29,270 --> 00:13:32,110

unclick listener I can just paste this value.



197

00:13:32,330 --> 00:13:38,930

So now as you can see here we have actually an error and it says valuable myself is accessed from within



198

00:13:39,020 --> 00:13:42,160

Inul class needs to be declared final.



199

00:13:42,170 --> 00:13:44,980

So here we can in line number 27.



200

00:13:44,990 --> 00:13:50,020

We can actually declare this valuable as final so that we can actually make it a constant.



201

00:13:50,120 --> 00:13:50,590

Right.



202

00:13:50,810 --> 00:13:53,540

And now as you can see here the error is gone.



203

00:13:53,570 --> 00:13:59,170

So now let's actually run our project here initialising AEB.



204

00:13:59,460 --> 00:14:04,330

And then you can actually choose the virtual device and then click on OK.



205

00:14:04,760 --> 00:14:06,260

So now let's wait.



206

00:14:06,720 --> 00:14:11,300

So now as you can see here our application is actually running on the emulator.



207

00:14:11,340 --> 00:14:14,250

So now let me make this emulator actually bigger.



208

00:14:14,390 --> 00:14:15,760

We're just trying to get here.



209

00:14:16,730 --> 00:14:22,010

And now if I click on the spot in here send the data to say well let's actually click on this button



210

00:14:22,040 --> 00:14:23,090

and see what happens.



211

00:14:23,090 --> 00:14:30,500

Just click on it and now let's actually open our web browser and then just click on this tab here and



212

00:14:30,500 --> 00:14:36,650

now as you can see here we have this key which is the location that you want to light that data right.



213

00:14:36,650 --> 00:14:43,240

So as you can see here we chose this you r l as the location that we want to light it up.



214

00:14:43,340 --> 00:14:50,960

So when I actually go to this you are well we actually guided to this actually the page to this instance



215

00:14:51,250 --> 00:14:54,610

and it we connected the right value to this parent.



216

00:14:54,650 --> 00:14:57,250

So this is going to be the key and this is going to be the value.



217

00:14:57,290 --> 00:15:01,410

And here you can see that we have this key and the value is Hello world.



218

00:15:01,640 --> 00:15:07,090

So now if we you to go to the Android studio here I can show you that first.



219

00:15:07,250 --> 00:15:10,540

We have a reference to their database instance.



220

00:15:10,730 --> 00:15:14,270

And then we have a reference to the location that we want to write the data.



221

00:15:14,270 --> 00:15:20,690

So this is the location that actually got us to this page that is valuable to this instance.



222

00:15:20,840 --> 00:15:26,180

And then when I say my left right might it refers to this instance right.



223

00:15:26,180 --> 00:15:28,040

Might have that set value.



224

00:15:28,490 --> 00:15:29,360

Hello world.



225

00:15:29,360 --> 00:15:32,430

Here we are setting the value here right.



226

00:15:32,480 --> 00:15:33,180

Hello world.



227

00:15:34,210 --> 00:15:38,240

So this is just a simple application right.



228

00:15:38,260 --> 00:15:40,630

We're going to actually make it more complex.



229

00:15:40,660 --> 00:15:43,690

But for now I just want you to get the idea right.



230

00:15:43,870 --> 00:15:52,020

And if I actually go to the open this tap here and as you can see we are just here right to your database.



231

00:15:52,110 --> 00:15:55,030

So now we want you to make it more complex.



232

00:15:55,080 --> 00:15:55,700

Right.



233

00:15:55,740 --> 00:16:00,790

So now let me actually just close this tab here and now we have this value.



234

00:16:00,840 --> 00:16:07,340

Let's actually go back to an android studio and here instead of hello world as you can see here are



235

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you going to actually put the value of these it takes to the set.



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So just delete this hello world here I just referred to the name of this EDT value dot get text dot



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2st so we can actually assign a think value here right.



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Because this sets value here.



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Let me actually just again refer to the name of this might have thought sets value as you can see it



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is set value needs a value of type Object.



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And this thing value can be actually an object right.



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So let's actually run our project now and let's wait a little bit here.



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So as you can see here our application is actually running on this emulator.



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So now as you can see if I click on the spot in here let's see what happens send the data to server.



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And let's actually open the browser here and now as you can see here we have an empty value.



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Why.



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Because we haven't actually assigned a value to this edit text so let's actually write a value here



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inside this as it takes.



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So here I can just typing proxying is a martial art.



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Right.



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And then click on send data to server.



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And now as you can see it says boxing is a martial art.



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Right.



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So it is actually sending this data that I put here to the server.



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So let's go back to what Android studio



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and now I want to actually make it a little more complex.



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So let's actually go to activity underline minute example.



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So here we need to actually make a design to use an interface here again.



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So let's actually just select this button here and then press on delete key on your keyboard.



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And then here we can actually say this componentry section at the bottom left here.



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You can actually just say this componentry section it can select this editrix and then press on delete



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key on your keyboard.



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So now we wanted to design the user interface here again.



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So let's see how we can do that.