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But now I want to actually generate for example more than one random number here.



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OK.



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And then I'm going to make the Spartan invisible.



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So in order to do that first of all let me point out that here we created an if statement here.



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OK.



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And we specified that if the length of this value is more than or equal to number nine then it's going



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to actually make this button invisible.



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Ok make this generates secure random numbers in this event.



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And here in this line of code in line 62.



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I am actually getting the value of this secure random numbers.



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OK.



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And then I am actually converting this value to a string value and then I am assigning that value to



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this string object all TXI the secure random numbers.



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So I actually are getting the old value here and I am putting that value here.



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OK.



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For example this number four is the old value and if you want to click on this button again or you want



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the next value.



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The next number to be beside of this number here number four.



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OK.



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So here in order to do that I can just typing inside this prentices I can just type in old TXI the secure



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random numbers value plus random secured number.



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So let's actually run our project again and see what happens.



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OK.



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Now as you can see our application is actually running on the emulator.



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So let's actually click on this generate secure random numbers.



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Number three let's actually click on this button again Firstly free to 4.



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Ok 1 1 5 2 4 2 and finish.



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As you can see it actually has generated this and that these are not random numbers.



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And now our button is invisible so we cannot do anything here.



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Or you can just click on this button again because we make this button invisible.



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So let me explain again.



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So now let me explain again what's going on here.



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OK so first of all we created a boolean variable.



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OK.



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Inside this main activity class.



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OK.



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So we made this but valuable private.



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So this variable is only visible inside the scope of this class only.



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OK.



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And then we assigned the value true to our value of it.



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And inside this set unclick listener of this PTEN secure random number as you can see.



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Let's actually run our project again because I want to show you some important points.



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



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For the first time for example on our emulator and this is our button and this is our view here secure



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random numbers are because we actually created a boolean variable here and we assign a value to to our



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variable here inside this these are pretty secure random numbers that set up like this and here as you



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can see when I actually click on this spot and it's going to actually execute the lines of code that



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are inside of this on my feet.



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OK.



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So first if I click on this button it's going to actually execute this up block of code here.



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If first time this means that if the value of the first time value is true.



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So it is true OK if the value of this first thing valuable is true then it's going actually as scientists



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empty value to our Takes view here.



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OK.



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So and then it's going can actually assign the value falls to this value bet.



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So let's actually click on the spot in as you can see it assigned the value empty.



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Here is a text from you and then it actually assign the value falls to this valuable.



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So this block of code is not going to be executed anymore.



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OK.



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Because the value of this first thing variable is false.



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So if I click on this button here again it's not going to actually execute this block of code here.



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OK.



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As you can see it didn't execute this block of code and it's going to actually after executing this



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block of block of code it's going I should execute these others these other block lines of code here



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as you can see.



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First it's going to actually create a secure random number object and then it's going to actually create



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a string value a strange object and then it's going to get the value of this text view here and then



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it's going to assign that value to this variable here.



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OK.



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It can actually get the value of this text view as you can CTX the secure random numbers that get text



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that restraint is going to actually get this value and then assign that value to this strange object.



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And here we created another if statement and we said that if the value of these t XTi secure random



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numbers here as you can see the value of this text you if the length of this text view is actually greater



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than or equal to number 9 then it's going to actually execute this line of code here.



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It's going to make this pattern invisible.



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OK.



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So as you can see here you've got two characters here.



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So this button is still visible.



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OK so this line of code is this block of code is not actually get executed yet and it is going to actually



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execute these lines of code here.



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It's going to actually create a random secure number starting from the value of one.



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And number five and it ends actually with number five.



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OK.



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So number one.



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And number five.



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And then we actually decided to output this value to the log.



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OK.



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So it's going to output this value to the lock and we can see those are random secure numbers.



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And here in 1969 we decided to output these values to the screen.



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And here we get the old tricks to secure random numbers value.



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OK.



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So as you can see for example this is the old value.



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OK.



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And we are assigning that value to this object.



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So you actually put this value here plus random secure number.



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So random security number is the newest random number that it actually generated for us.



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OK.



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So let's actually click on this button again.



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Free to free this free.



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Here is the newest value as you can see this one is the news value.



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So these are free numbers here.



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Free to free is the old value.



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OK.



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And this is the old all the secure random numbers here.



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OK.



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And here.



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And so on.



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And then it's going to make this button invisible.



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So it actually Executive this if statement here.



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OK.



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So whenever you actually click on this button it's going to actually execute these lines of code here.



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So you should actually always consider this in all of your programs.



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OK.



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So hopefully that makes sense.



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Ok everyone.



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Now I want to talk about two important points about this project.



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First of all as you can see here we created a billion valuable first time here and we actually signed



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the value true to our value.



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So why did I actually created this variable here inside of this class and not in sight of this unclick



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comfort.



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And the reason for that is because I want this value to be present for the entire life of my application.



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OK.



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When the user starts my application I want this app this valuable actually gets created and I want to



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actually manipulate the value of this variable inside of these assets click listen listener.



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We created an if statement here and then we actually said that if the value of this first time variable



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is true executes this line of code here takes the secure random numbers the set text is empty value



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and then assign the value falls to this value.



128

00:08:12,800 --> 00:08:16,000

So when I actually assigned a value to this valuable.



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OK.



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00:08:16,370 --> 00:08:20,350

As you can see we created this variable here inside of this class.



131

00:08:20,600 --> 00:08:26,900

And when I actually assign the value false to this valuable This means that the value of this first



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00:08:26,900 --> 00:08:33,590

time valuable is going to be false throughout the entire application unless I actually change that value



133

00:08:33,740 --> 00:08:35,180

somewhere else in my code.



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00:08:35,330 --> 00:08:42,290

But when I actually assign the value false to this valuable it is going to be false for the entire lifetime



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00:08:42,290 --> 00:08:43,580

of my application.



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00:08:43,610 --> 00:08:50,610

Lifetime means that when the user actually starts the application till the user actually ends the application.



137

00:08:50,610 --> 00:08:51,010

OK.



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00:08:51,110 --> 00:08:55,670

This is the one important point because I want this value for throughout the entire application.



139

00:08:55,820 --> 00:09:04,130

I needed to create this app this variable inside the class because I wanted to actually manipulate the



140

00:09:04,130 --> 00:09:10,560

value of this variable somewhere else in my code in one of my methods and that I wanted that value to



141

00:09:10,580 --> 00:09:14,730

be present throughout the entire lifetime of my application.



142

00:09:14,750 --> 00:09:15,150

OK.



143

00:09:15,290 --> 00:09:21,860

So when you create a valuable inside one of your methods such as Uncle Smurfette or another method that



144

00:09:21,860 --> 00:09:29,720

has this get maximum here when you create a variable the life of that variable is actually dependent



145

00:09:29,810 --> 00:09:32,590

to that actually curly braces of that method.



146

00:09:32,600 --> 00:09:33,130

OK.



147

00:09:33,260 --> 00:09:38,970

When that method is executed that are actually valuable is going to be eliminated.



148

00:09:39,050 --> 00:09:41,560

OK that's the end of the life of that variable.



149

00:09:41,570 --> 00:09:46,260

So the life of this variable is actually dependent to this method.



150

00:09:46,550 --> 00:09:47,010

OK.



151

00:09:47,060 --> 00:09:54,350

So this variable is local variable and we cannot actually use this variable from other methods or other



152

00:09:54,350 --> 00:09:57,780

places of this class that are inside of this class.



153

00:09:57,860 --> 00:10:03,170

So we cannot this variable the value of this valuable because this is a local variable.



154

00:10:03,190 --> 00:10:03,660

OK.



155

00:10:03,800 --> 00:10:07,010

And this variable is only alive in this method.



156

00:10:07,050 --> 00:10:10,820

We are actually referring to the name of this get the maximum Meffert.



157

00:10:10,830 --> 00:10:11,160

OK.



158

00:10:11,210 --> 00:10:14,140

But as you can see here we refer to this method and.



159

00:10:14,240 --> 00:10:16,990

And it can actually go inside of this method.



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00:10:17,150 --> 00:10:21,630

And then as you can see it's going to actually execute these lines of code inside of this Meffert.