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So now let's actually declare some variables here inside the main activity class.



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So now here I just started typing firebase database and the name of this variable is going to be database



3

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assignment operator.



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00:00:15,690 --> 00:00:20,390

And here I want to actually create an instance from our database.



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So here I can say Firebrace database start with instance and then I need to put a semicolon at the end



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00:00:25,950 --> 00:00:27,200

of my statement.



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00:00:27,210 --> 00:00:33,570

So in this way you are actually getting on an instance of our database so let's actually open our web



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browser here and now actually go to our console on here.



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As you can see we just need to select our project So our project is this one at 60 65 right.



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So let's actually click on it.



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And then here to just click on this database here.



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And now click on these rules tab.



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So now let's actually change the rules so that the users that are not authenticated can also interact



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with the database.



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So let's actually change the rules here so here.



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Just delete this exclamation mark and put an equal operator.



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And then here just delete this exclamation mark and put any quote operator here and then click publish.



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So now it says rules published.



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So let's actually click on the state I'd have here again.



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And now here it is our database instance right.



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So when we say that we have actually an instance from our database this is that instance right.



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And now as you can see here I actually initialized this valuable right inside our class.



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It's not a good program in practice to initialize your valuables inside your class.



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It's always recommended that you just declared your valuables here inside just inside your main activity



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class and then inside your uncreate Smurfette initialized them.



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Why.



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Because for example when you are actually transitioning to another activity and when you want to actually



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come back to this activity again for example this class display an activity here may be actually garbage



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collected and maybe just eliminated from our memory.



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So in that case we may have no instance for a modified firebase database.



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But if we have this uncreate method here inside our uncreative it just initialize my valuable here.



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Every time that this main activity here is actually shown to the user this uncreate Smurfette is going



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to be called as the first method that is actually being caught.



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Right.



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00:02:44,330 --> 00:02:48,530

So let's actually delete this initialiser here and here.



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Let's just put a semicolon here and now as you can see I just declare my variable my firebase database



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here right.



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I didn't initialize it yet.



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00:02:58,880 --> 00:03:05,980

So let's actually declare that let's actually declare another variable of type database reference.



40

00:03:06,410 --> 00:03:09,950

So now you've got to have a reference to this instance.



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Right.



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00:03:10,580 --> 00:03:13,580

It's not enough to just have the database instance.



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We just need to have a reference to this database to this instance.



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00:03:18,560 --> 00:03:23,660

So let's go back to what androids would use or database offense and the name is database reference assignment



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operator.



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00:03:24,500 --> 00:03:31,610

And here I just need to refer to the name of this database that gets a reference and then put a semicolon



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00:03:31,940 --> 00:03:32,980

at the end of your statement.



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00:03:32,990 --> 00:03:36,910

And again as you can see I just initialized it here right.



49

00:03:36,930 --> 00:03:43,310

It's not a good Procrit programming practice to initialize your variables here especially your objects



50

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as you can see here we have objects but it's good it's actually it's not a problem to initialize your



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00:03:49,670 --> 00:03:54,040

primitive data types such as ints or floats or char.



52

00:03:54,170 --> 00:03:56,690

It's not a problem but for your objects.



53

00:03:56,690 --> 00:04:01,570

Always make sure to initialize them inside your methods such as uncreate or on resume.



54

00:04:01,730 --> 00:04:06,580

So you already are familiar with the android lifecycle methods.



55

00:04:06,590 --> 00:04:09,890

So again let's actually delete this initialization here.



56

00:04:10,100 --> 00:04:17,840

So here I wanted to actually talk about this initialising variables especially the objects inside your



57

00:04:17,840 --> 00:04:18,580

class.



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00:04:18,710 --> 00:04:24,630

And what's the difference between initializing them inside your class and initializing them.



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00:04:24,650 --> 00:04:27,600

Inside the method such as this uncreate Smurfette.



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00:04:27,710 --> 00:04:28,160

Right.



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00:04:28,220 --> 00:04:30,610

So now let's go inside this uncreate Smurfette.



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00:04:30,650 --> 00:04:36,800

And here inside this uncreate Meffert let's just initialize our variables here.



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00:04:36,800 --> 00:04:39,050

For example this one firebase the top is.



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So inside this uncreate I can say database assignment operator and then here I can just say firebase



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00:04:45,800 --> 00:04:50,860

database start get instance and then I need to put a semicolon he added of my statement.



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And now let's initialize our database reference.



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So here I tend to say database reference assignment operator.



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And then here I can refer to the name of this database that gets through a fence and then I need to



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00:05:04,340 --> 00:05:06,670

put a semicolon at the end of my statement.



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00:05:06,710 --> 00:05:14,960

So we managed to actually declare and initialize all of a firebase database object and database reference



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object.



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00:05:15,650 --> 00:05:16,200

Right.



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00:05:16,520 --> 00:05:20,750

So now let's actually put some more lines of code here.



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00:05:20,750 --> 00:05:23,200

Inside is uncreate method.



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00:05:23,270 --> 00:05:29,180

The first thing that we should do here is to actually make the spot in BT and send data to separate



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00:05:29,180 --> 00:05:32,510

the spot in actually a listener to the clicks of the user.



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00:05:32,510 --> 00:05:36,030

So let me show you the emulator as you can see this is our emulator.



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00:05:36,140 --> 00:05:38,070

And now I want to actually read these data.



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00:05:38,090 --> 00:05:42,880

For example the Buxar name the Buxar punch power and the box of punch speed.



80

00:05:42,980 --> 00:05:50,010

And I want to actually get these values from these texts and I want to send them to the server whenever



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00:05:50,030 --> 00:05:52,640

the user clicks on the spot and send data.



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00:05:52,820 --> 00:06:00,610

So do that here inside this uncreate benefit I meant to say PTEN send data to server that said unclick



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00:06:00,630 --> 00:06:01,440

listener.



84

00:06:01,710 --> 00:06:07,050

And here I just need to put the new key word here and then just hold the shift key on your keyboard



85

00:06:07,080 --> 00:06:09,730

and then press on the leader the key on your keyboard.



86

00:06:09,900 --> 00:06:15,560

And now the autocomplete feature of the Android studio is actually helping us to choose this option.



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00:06:15,570 --> 00:06:17,080

Unclick listener right.



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00:06:17,160 --> 00:06:20,460

So as this one here and in person enter key on your keyboard.



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00:06:20,730 --> 00:06:26,580

And now as you can see here are the Android studio automatically put these lines of code here for us.



90

00:06:26,580 --> 00:06:32,490

So again let me tell you that we have actually an anonymous in a class and this anonymous in a class



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00:06:32,490 --> 00:06:37,620

is actually implemented in the they view that and click click center interface.



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00:06:37,680 --> 00:06:43,650

And because that anonymous class is implementing this interface unclick listener that class must actually



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00:06:43,650 --> 00:06:47,280

pro-white an implementation for this on a college Meffert.



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00:06:47,490 --> 00:06:50,910

So the remember that anonymous classes are classes without names.



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00:06:50,970 --> 00:06:51,390

Right.



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00:06:51,420 --> 00:06:55,550

So here we have actually a class but that class doesn't have a name.



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00:06:55,560 --> 00:07:01,650

So now here we are actually inside a class and now we are going to have inside Smurfette in that is



98

00:07:01,650 --> 00:07:05,890

inside of that anonymous inner class which is this one on clique Meffert right.



99

00:07:06,150 --> 00:07:07,810

So let's go inside this method.



100

00:07:08,150 --> 00:07:11,670

So what we should do here what should I do here.



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00:07:11,670 --> 00:07:18,320

What I want to do here is always ask these questions when you want to actually write your codes.



102

00:07:18,510 --> 00:07:26,790

So the first thing that you want to do here is to actually create an object of the hype Buxar class.



103

00:07:26,790 --> 00:07:31,590

So let's actually just click on this box or telephone it here as you can see if you have a box or a



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class with these instance variables as you can see.



105

00:07:34,280 --> 00:07:36,160

Here we have actually this constructed.



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00:07:36,180 --> 00:07:39,910

And we have these getters for these instance variables.



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So inside this main activity class are you able to create an object of pipe Buxar of tables at class



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00:07:46,240 --> 00:07:49,950

and I want to actually descent that specific object to the server.



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So let's see how we can do that.



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First of all I need to elevate the use it actually click on this button.



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I need to create an object of type Buxar.



112

00:07:58,350 --> 00:08:01,230

So let's actually create an object of a Buxar here.



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00:08:01,230 --> 00:08:06,770

So here I can say Boxer and the name of my object is Buxar assignment operator.



114

00:08:07,050 --> 00:08:09,920

And here I just need to put the new keyword here.



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00:08:09,960 --> 00:08:16,610

So as you can see here first I just created a valuable type box.



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00:08:16,680 --> 00:08:16,920

Right.



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And the name of many variables is boxer.



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So you already know that variables are just placeholders for storing data values valuables in order



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00:08:26,790 --> 00:08:33,840

to store data and when ever I want to actually access those data I can just refer to the name of that



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variable.



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So here we have this body right here right and now I've put an assignment operator here and now I want



122

00:08:41,760 --> 00:08:44,280

to actually create the actual object.



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00:08:44,280 --> 00:08:49,970

So whenever you put the new key word it means that you want to create an object so new.



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00:08:50,100 --> 00:08:56,370

And here I can say Boxer and here just select this upset and then press enter key on your keyboard.



125

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And here it says that we have actually two constructors.



126

00:08:59,940 --> 00:09:03,810

The first constructor is without no no parameters.



127

00:09:03,800 --> 00:09:05,950

It is without any parameters as you can see here.



128

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But the second constructor is this one which accepts an argument of types 3 and Buxar name.



129

00:09:12,750 --> 00:09:19,750

So let's actually provide a name for our Buxar so we can provide a string value here a string literal



130

00:09:20,190 --> 00:09:27,300

or as you can see here let me show you the emulator and as you can see we have these 80 texts.



131

00:09:27,360 --> 00:09:31,840

So you want to get these values from are any texts or text fields.



132

00:09:31,980 --> 00:09:43,050

So here I can say for the first argument I can't say EDT Boxford name dot get fixed dot two strings.



133

00:09:43,620 --> 00:09:44,310

Right.



134

00:09:44,310 --> 00:09:49,120

So this is going to be our first argument for our puzzle name.



135

00:09:49,170 --> 00:09:52,690

The second argument is actually for the Buxar power.



136

00:09:52,740 --> 00:09:53,280

Right.



137

00:09:53,280 --> 00:09:55,940

So here again this is our edit text right.



138

00:09:55,950 --> 00:10:06,880

So here I can't say EDT EDT box idiotcy punch power that's get text that string.



139

00:10:07,380 --> 00:10:12,070

So this is our second argument and the first argument is this one punch speed.



140

00:10:12,090 --> 00:10:12,640

Right.



141

00:10:12,660 --> 00:10:17,140

So here I can't say EDT punch speed.



142

00:10:17,520 --> 00:10:24,750

That's good text editor pun spitted get text that too strange.



143

00:10:25,200 --> 00:10:28,010

So at the end of your statement put a semi-colon.



144

00:10:28,030 --> 00:10:33,350

And now let me actually create a new line here so that you can see these values are better.



145

00:10:33,750 --> 00:10:41,730

So as you can see here you are creating an object of type Buxar and this box class as you can see needs



146

00:10:41,810 --> 00:10:43,640

of free arguments as you can see here.



147

00:10:43,650 --> 00:10:48,660

This object needs a free values for free arguments for the first argument.



148

00:10:48,690 --> 00:10:54,000

As you can see here if you need to pass a string value which is this one EDT box and in that get text



149

00:10:54,000 --> 00:10:54,840

that was.



150

00:10:55,170 --> 00:11:00,240

But for the second argument as you can see we have punch power which is of integer.



151

00:11:00,420 --> 00:11:03,910

Right but we actually passed OSTLUND value.



152

00:11:03,990 --> 00:11:06,850

EDT punch power that get text that restraint.



153

00:11:06,930 --> 00:11:10,730

This is actually string value that we get from this text.



154

00:11:10,890 --> 00:11:16,100

So here mean it actually an integer value not and not as string value.



155

00:11:16,110 --> 00:11:17,560

So what's the problem here.



156

00:11:17,610 --> 00:11:25,050

How we can solve this problem how we can actually convert it and a string value to an integer value.



157

00:11:25,050 --> 00:11:30,480

So in order to do that here as a Can I just need to just type in here integer.



158

00:11:30,540 --> 00:11:33,360

So before this value it is punch power.



159

00:11:33,360 --> 00:11:35,230

Here are just the integer.



160

00:11:35,550 --> 00:11:39,220

So here I am referring to the name of the integer class with capital.



161

00:11:39,300 --> 00:11:40,490

This is very important.



162

00:11:40,620 --> 00:11:44,550

And then here I just need to call a static method on this class.



163

00:11:44,550 --> 00:11:48,510

So you already you are already familiar with the static methods indaba.



164

00:11:48,690 --> 00:11:52,280

So here integer parts end.



165

00:11:52,380 --> 00:11:58,560

So as you can see here we have this method parse it and this method parse and accepts an argument of



166

00:11:58,560 --> 00:11:59,490

types 3.



167

00:11:59,670 --> 00:12:03,480

So it's going to actually convert a string value to an integer value.



168

00:12:03,570 --> 00:12:05,840

So integer that parse it.



169

00:12:06,240 --> 00:12:14,310

And now we need to pass this thing value to this method parse it and then I need to put a close parenthesis



170

00:12:14,310 --> 00:12:15,260

here at the end.



171

00:12:15,420 --> 00:12:17,230

So this is our second argument.



172

00:12:17,240 --> 00:12:24,930

And now we solve one of these problems and here we have our first argument as you can see here it says



173

00:12:25,110 --> 00:12:29,440

again for the first argument we need to pass the punch speed because of that integer.



174

00:12:29,580 --> 00:12:31,780

But we passed our string value.



175

00:12:31,890 --> 00:12:38,840

So here in order to solve this problem again I can say integer dot parse it as you can see here.



176

00:12:38,970 --> 00:12:46,290

Again I need to pass this string value to this method parse it and then I need to put a close parenthesis



177

00:12:46,290 --> 00:12:49,890

at the end so hopefully that makes sense.



178

00:12:49,950 --> 00:12:58,140

And now you can see that we created an object of type Buxar here and we passed these values as the arguments



179

00:12:58,140 --> 00:13:00,300

of these Boxford object right.



180

00:13:01,370 --> 00:13:04,620

And be assigned it is object to this Buxar valuable.



181

00:13:04,790 --> 00:13:08,810

So now this box of valuable holds this box that object.



182

00:13:08,810 --> 00:13:09,510

Right.



183

00:13:09,860 --> 00:13:13,540

And now I want to actually send this Buxar objects to the set.



184

00:13:13,540 --> 00:13:14,030

Right.



185

00:13:14,060 --> 00:13:15,890

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



186

00:13:15,880 --> 00:13:20,260

I can say database reference dots.



187

00:13:20,670 --> 00:13:24,850

And here I want to actually create a child here.



188

00:13:24,960 --> 00:13:26,260

I want to create a child.



189

00:13:26,400 --> 00:13:28,460

Let's let me show you the web browser here.



190

00:13:28,680 --> 00:13:34,960

I want to create a child and I want that child name to be actually a unique ID.



191

00:13:35,130 --> 00:13:40,270

And then I need to I want to actually pass that object to that box that object to that idea.



192

00:13:40,290 --> 00:13:47,950

I want to actually pass up the box that object as a child of that ID.



193

00:13:47,970 --> 00:13:52,380

So in this way we can have multiple IDs with different backset objects.



194

00:13:52,380 --> 00:13:53,750

So let's see how we can do that.



195

00:13:53,760 --> 00:13:55,400

Let's go back to an android studio.



196

00:13:55,470 --> 00:13:59,970

So database reference thot child.



197

00:13:59,970 --> 00:14:02,950

So for the child I need to pass a string value right.



198

00:14:02,970 --> 00:14:06,270

So here I can't say databased offense.



199

00:14:06,270 --> 00:14:10,910

That's a push that's key.



200

00:14:10,950 --> 00:14:18,000

So in this way we are actually creating a unique ID so database reference that push that get keyed in



201

00:14:18,000 --> 00:14:22,500

this way we are creating a unique ID and then we are actually getting that value which is actually the



202

00:14:22,500 --> 00:14:23,430

osting value.



203

00:14:23,460 --> 00:14:25,100

By calling this method get key.



204

00:14:25,290 --> 00:14:33,240

So in this way we can actually get that child right and you want to pass or box that object to that



205

00:14:33,450 --> 00:14:35,280

child which is this idea.



206

00:14:35,310 --> 00:14:42,220

So here I can say that set value Buxar semicolon.



207

00:14:42,510 --> 00:14:46,320

So now we can actually pass our box object to the server.



208

00:14:46,410 --> 00:14:49,580

So it's actually on our project and see what happens.



209

00:14:49,710 --> 00:14:54,820

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



210

00:14:54,930 --> 00:14:59,900

So let me show you the web browser here and then let me show you the emulator.



211

00:15:00,120 --> 00:15:06,090

So now let's actually create an abox that object and this sent that box that object to this error.



212

00:15:06,150 --> 00:15:08,310

So let's specify the Buxar name.



213

00:15:08,310 --> 00:15:10,510

So for example the box and it is a.



214

00:15:10,740 --> 00:15:14,610

And the punch power is one handed and the punch speed is 200.



215

00:15:14,610 --> 00:15:15,280

Right.



216

00:15:15,390 --> 00:15:19,420

So now let's click on the spot and send data to server.



217

00:15:19,580 --> 00:15:22,640

And now we should see these data here.



218

00:15:22,890 --> 00:15:24,390

That's a little bit here.



219

00:15:26,050 --> 00:15:29,020

And here as you can see this is our ID.



220

00:15:29,050 --> 00:15:34,640

I told you that I'm going to actually create a unique ID and then we can actually pass that the box



221

00:15:34,690 --> 00:15:42,790

that object to this idea or I can actually make that box that objects object as a child of this ID.



222

00:15:42,910 --> 00:15:43,210

Right.



223

00:15:43,210 --> 00:15:49,570

So we have this unique ID and he and as you can see this is our box of object with these values Buxar



224

00:15:49,630 --> 00:15:54,160

named a punch power 100 and Dupont's speed 200.



225

00:15:54,160 --> 00:16:00,600

So we have this unique ID and this box that object is actually a child of this unique ID.



226

00:16:00,610 --> 00:16:01,260

Right.



227

00:16:01,540 --> 00:16:03,820

So let's actually create another box set up to it.



228

00:16:03,870 --> 00:16:11,180

In this this time the name is be the punch power is 10 and the punch speed is 20.



229

00:16:11,410 --> 00:16:17,860

Let's click on this button send data to server and again as you can see we have another box up box that



230

00:16:17,890 --> 00:16:24,970

object we can actually create another box object with these specifications with these values because



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we have different ideas as you can see here.



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Right.



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So let's create another box set up to this time the name is c..



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And the punch power is a 400.



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And the punch speed is for example 90 and then click on send data to a server and he and as you can



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see we have another box set object with a unique ID.



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Let's create another boxer object.



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So this time the name is D and the power the punch power is for 40.



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And the punch spit is 900 and then click on send data to server.



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And again as you can see we have another box object here.



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Right.



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So let's go back to our Android studio and now I will try to get these data here as you can see we have



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these data here right.



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I want to get all these data this and I want to show it here inside my emulator inside our takes view



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that is actually the inside of a vertical scroll view.



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So let's go back to our Android studio and here before the end in curly brace of this uncreate Smurfette.



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So as you can see here after the Indian curly brace and after the end prentices hear of this up.



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So thankful because of this button I want to actually just create an add value event listener for our



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reference.



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Right.



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



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I can actually create an add value event listener for this reference and then I can be notified when



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the user changes.



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One of these objects right for example the user wants to delete this object.



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And then I can be notified.



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Or for example the user adds an object to the database.



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And in that way again I can be notified and I can show that data to the user.



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So let's go back to our Android studio and here I can say database reference.



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That's at value event listener knew.



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So in say the prentices just put the new key vote and he had to just hold the shift key on your keyboard



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and then press on the little key on your keyboard.



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Value event listener and the Android studio is going to help you to choose this option and that person



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entered on your keyboard.



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And here as you can see after the end prentices just put a semicolon.



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So now as you can see we have these two methods on data change and canceled.



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So if you want to work with this on data or change my fear because whenever that user changes one of



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these objects we can be notified.