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So now as you can see here these are the lines of code that I pasted here and now I'm going to explain



2

00:00:07,480 --> 00:00:09,220

to you what's going on here.



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Exactly.



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So just look at this line of code here in line number 59 I just referred to the name of this fragment



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my animal quiz fragment that modify animals just rose.



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So as you can see here I want to actually get there actually there.



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I guess those that are actually saved to the shared preferences so preference manager.



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So as an argument I pass this value preference managers that get shared that shared preferences and



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we need to pass the context here.



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Main activity that is so in this way of any event when we are actually running the application on the



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Android device we're going to actually call them if at uncreate.



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Right.



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And we need to actually get all these changes that are actually saved to the shared preferences we need



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to get whether the user has actually changed the number of guesses or not.



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We need to actually see whether the user has actually changed the types of animals that he or she wants



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to be used in say the Queen or not.



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We need to get the value of the backend in uncolored from the shared preferences.



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We need to also get the font of the text of the patents that are saved to the shared preferences.



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So it's very important that we put in these lines of code here inside this uncreate Smurfette.



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So first of all we're actually calling the Smurfette my any fragment that modify animals get.



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First of what we need to specify the number of throws that we have in say the keys.



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As you can see here and that we pass this argument preference managers that get shared that get the



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file share preferences and then we need to pass this argument main activity that does.



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And as you can see in line number 60 we are calling this fragment my animalcules for argument dot modified



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type of animals increase.



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And now we need to be actually sure that what is going to be what are the types of the animals that



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are going to be used inside the quiz.



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So that's why inside this uncreate Smurfette we are calling this method modified type of animals inquiries



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so we can actually specify the type of animals that are going to be used inside the application.



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So my ultimate goal is my ultimate quest for argument that my dad modified type of animals increase.



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And again we passed this argument pre-ferment manager don't get default shared preferences and that



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we need to pass this argument this context main activity that this.



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And then as you can see here in line number 61 I actually Fuerth to the name of this object my animalcules



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is a fragment that modified cuius front and that means to actually get the front of the text of the



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buttons from the shirt preferences.



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So my argument is fragment that modified quiffs want preference manager to get default Sheth preferences.



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Main activity that this.



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And as you can see here my animal quest for argument as you can see here in number 62 my element for



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argument that modified background color.



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And then I wanted to actually get the background color of this actually of these queries.



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And then I wanted to set it here.



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So we are actually getting the back in uncolored of the Queen from the shirt preferences.



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And then we're actually setting that back in and color to that back in uncolored of the squeeze.



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Right.



45

00:03:15,640 --> 00:03:21,400

So as you can see modified I can uncolored pre-feminist manages to get default shirt preferences so



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this default shell preferences is actually that Shipley's for Shapley friend says that is actually specific



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to our application inside the user's device.



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Right.



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So as you can see here professional managers that get the file shares the preferences main activity



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at this point.



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Now as you can see here finally we need to actually call the Smurfette reset animalcules.



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So my Ahlquist fragment that reset animalcules.



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So it's going I truly reset the animal cuius with those changes and then finally we need to set the



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value falls for these settings changed.



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Valuable right.



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Because inside the uncreate Smurfette fisted have not changed the settings of the application.



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When the uncreate method is called in that specific moment you are just starting to see the application



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the user interface of the application and then it's going to actually do these jobs for us.



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And finally you need to pass the value falls to these is settings change to valuable to assign the value



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falls to these is getting changed valuable so that we can actually see these changes here.



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Right.



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So that we are actually sure that the settings have not changed.



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We are just getting to change those settings those changes from the shared preferences and then if we



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are actually setting to get here.



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So now let's actually close this application here inside our emulator and now let's actually open our



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menu and let me actually delete our own application here because we actually for example work when we



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are working with the shared preferences it is very important that when you change the shift preferences



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and when you actually for example provide more logic in order to interact with the shared preferences



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it's better to always delete your application from the device so that the shirt preferences is also



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deleted and then run your application again with the new actually changes.



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Right.



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Because we actually put lots of code here and inside this main activity AFFREIGHTMENT it's better to



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actually delete our application from the device.



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And now when I run my application it's going actually right it's I try to read those logic from my shared



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preferences from the quotes that I provided here.



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



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So as you can see we have this question and as you can see if I click on go here as you can see it says



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go right.



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And now as you can see here we have actually this eagle and I just need to select eagle and it says



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right here.



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This is animal free of pen.



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So here for example I select bird and now you can see this animation.



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No.



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Or for example bird you can see this animation snake.



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And as you can see these buttons are actually that is a belt.



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And now if I click on elephant as you can see here it says elephant right.



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And you can see this animation here.



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And we have this rabbit.



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So you just need to click on this rabbit and it says rabbit.



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Right here we have snake right.



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Just select snake right.



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And here we have.



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And as you can see here and.



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Right.



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And here we have a mouse.



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So I just need to select the mouse.



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And then as you can see here it says right here if you have a peacock so you just need to select the



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peacock and here it says peacock.



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Right.



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And here we have actually Asharq.



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So I just need to sell it short.



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And here it's this short right.



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And finally this is animal 10 out of 10.



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And as you can see here I just need to select penguin.



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And now we have this dialogue and it says 14 number of 14 number of guesses.



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And seventy six point ninety two percent correct.



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And here again just this thought animal quiz as you can see here.



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And here you can actually go in say the settings.



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I can actually change the number of options to for example six gives options and then I can actually



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can you can back button here as you can see we have six options here.



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I can change it to actually two number of options.



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And now as you can see here our application crashed.



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So we have a bug inside the application.



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So now let's actually go inside the Android studio and let's see what's wrong here.



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So now let me show you this sort of back here and then I'm going to explain to you what's actually the



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error.



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So now let me put it on our application again here.



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So now I want to show you the source of the book and and then it really makes sense.



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So now let me show you the emulator and now we can actually show us our application.



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So now for example if I were to go inside these settings activity and at the top as you can see here



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we have this back button here right.



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Every time I click dispatch button here as you can see it's going to show us this activity here.



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Right.



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So now this means that it's going to actually create an instance of type main activity.



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Every time I click on dispatch button here as you can see here the question is changes minute when I



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actually click on dispatch button here right click this question.



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So now let me show you my own application here.



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This is the application that we built throughout this up from this lesson.



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Now I want to show you the final version of the application and now you want to actually show you a



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really important point.



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So now in order to show you the background applications I just need to click on the spot in here and



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now as you can see this is the final version of the application right.



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And now as you can see I want to go to the are actually setting activity here and here.



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I just want to click on dispatch button here at the top as you can see here.



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Our application is actually does is not reset right.



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You can see that as an instance of type this main activity is not created.



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Every time I actually click on dispatch button here the same question is actually here right.



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We have our snatch up here.



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And as you can see here we have the same options here.



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Right.



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So when I go to these cities activity and I've been able to go back here as you can see the same image



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is here the same options this year and the same taste is here.



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But when I actually open our own application as you can see here when I go to these settings activity



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now when I click on dispatch button here as you can see our application is reset and an instance of



145

00:09:46,090 --> 00:09:51,820

type of main activity is created every time I actually click on dispatch button here.



146

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Right.



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As you can see an instance of type uncreate method an instance of pikemen activity is actually created



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every time that we click on dispatch button here.



149

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So this is going to create a problem a very bad problem.



150

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This is actually a really nasty bug.



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Why.



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Because they did it.



153

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The Android should not create instances of type main activity.



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When I create batch put in here at the top at the top because it's going actually these instances are



155

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not going to be removed from their memory.



156

00:10:25,300 --> 00:10:28,790

And these instances are going to be actually be there.



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And then when the Android device is actually going to out is going to is actually out of memory or the



158

00:10:37,000 --> 00:10:43,770

application is going to actually crash or actually it's going to create a confusion inside our application.



159

00:10:43,810 --> 00:10:44,360

Right.



160

00:10:44,380 --> 00:10:49,470

So when I actually click on dispatch button here as you can see every time that I can expect to hear



161

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an instance of type main activity here is created and that instance actually is going to remain there



162

00:10:56,500 --> 00:10:58,580

it's not going to be removed from the memory.



163

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So as you can see here we have one instance here and again when I click on this button he had another



164

00:11:03,300 --> 00:11:07,280

instance he's created and the last instance is still in the memory.



165

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And when I again go back here click on this box.



166

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And here again another instance is created and this is a very bad bug.



167

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We should not actually tolerate these kinds of bugs inside that application because it's going to actually



168

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create confusion.



169

00:11:20,940 --> 00:11:27,180

It's going to create a confusion and our application cannot handle these kinds of confusions and Android



170

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is going to crash our application.



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Right.



172

00:11:29,790 --> 00:11:34,100

So we need to actually come up with an idea or solution for this problem.



173

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As you can see we should not create an instance of take main activity every time that I can dispatch



174

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button here.



175

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Right.



176

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So what squit what's the solution.



177

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The solution is going to be inside of the manifest file.



178

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So now let me show you the structure of the project.



179

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So just click on this view tool windows and then click on project and then double click on this manifests



180

00:11:58,260 --> 00:11:58,970

here.



181

00:11:59,250 --> 00:12:01,800

So now let me actually double click on this tab here.



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Android manifested exemplified in order to make this area wider as you can see here we have this application



183

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tag.



184

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And inside this application page we have this activity tag for our main activity class.



185

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Right.



186

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That main activity and this thought main activity here means that this may not be the main activity



187

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class is actually inside of this package that the Android manifest is specified here.



188

00:12:23,290 --> 00:12:26,590

The package that is a site that that animal quits.



189

00:12:26,610 --> 00:12:29,370

So now inside is animal here.



190

00:12:29,430 --> 00:12:31,280

You want to add another attribute.



191

00:12:31,380 --> 00:12:39,330

So before the ending tag of this activity here I can just typing in launch mode and now just as you



192

00:12:39,330 --> 00:12:40,840

can see here we have different options.



193

00:12:40,850 --> 00:12:44,990

Single top single instance single task standard.



194

00:12:45,040 --> 00:12:51,450

So because I want to have only one instance that is actually at the top of our application and I don't



195

00:12:51,450 --> 00:12:57,190

want to create an instance every time that I click on this I actually click on dispatch button here



196

00:12:57,240 --> 00:13:00,390

as you can see when I click on the Spike put in here.



197

00:13:00,400 --> 00:13:02,440

I don't want to create another instance.



198

00:13:02,580 --> 00:13:06,030

So I just want to have a single top I should activity here.



199

00:13:06,060 --> 00:13:06,500

Right.



200

00:13:06,600 --> 00:13:10,200

So here I can just select single type here.



201

00:13:10,200 --> 00:13:10,650

Right.



202

00:13:10,680 --> 00:13:16,080

So if you want to actually bring up the autocomplete here just hold the control sheet on your keyboard



203

00:13:16,140 --> 00:13:21,340

and then press on Spacey on your keyboard and then choose a single top here.



204

00:13:21,720 --> 00:13:24,150

As you can see here or you can just type it here right.



205

00:13:24,150 --> 00:13:25,160

Single top.



206

00:13:25,240 --> 00:13:26,160

And now.



207

00:13:26,280 --> 00:13:32,580

Now let's actually open the emulator and now let me try to delete this application here because I told



208

00:13:32,580 --> 00:13:37,020

you because you are actually interacting with the shared preferences.



209

00:13:37,170 --> 00:13:42,930

It's really actually a good practice that you deal with the application from the device so that those



210

00:13:42,930 --> 00:13:51,630

kinds of bad bugs are not going to be actually prevent you are not going to prevent you from actually



211

00:13:51,840 --> 00:13:54,250

running your application smoothly.



212

00:13:54,240 --> 00:14:01,000

So now the app is uninstalled and now let let me run our application again here so excuse me.



213

00:14:01,020 --> 00:14:03,150

I actually deleted.



214

00:14:03,360 --> 00:14:04,990

I actually uninstall uninstalled.



215

00:14:05,040 --> 00:14:07,770

There are the final version of the application.



216

00:14:07,770 --> 00:14:12,690

This is our own application as you can see so I just need to select it and I just need to uninstall



217

00:14:12,690 --> 00:14:14,390

it here.



218

00:14:14,520 --> 00:14:19,230

So now let me run our application here again.



219

00:14:19,380 --> 00:14:24,720

So now as you can see here our application is running on this emulator for the first time.



220

00:14:24,870 --> 00:14:29,420

So when I let me go inside the settings activity and now let me actually change the number of guesses



221

00:14:29,430 --> 00:14:30,990

to for example 2.



222

00:14:31,320 --> 00:14:35,490

And now as you can see here it says new changes are applied and now at the top or at the top.



223

00:14:35,490 --> 00:14:38,610

I just need to click on dispatch button here as you can see here.



224

00:14:38,790 --> 00:14:41,060

So now we have only two options.



225

00:14:41,080 --> 00:14:44,530

And now let me go to these settings activity and then click on this patch.



226

00:14:44,530 --> 00:14:48,750

But then here again as you can see another instance is not created here.



227

00:14:48,770 --> 00:14:51,120

When I click on dispatch button here right.



228

00:14:51,450 --> 00:14:54,570

We have only one single top instance.



229

00:14:54,570 --> 00:15:00,570

So now let me change the number of guesses to 4 and then click on back button here as you can see we



230

00:15:00,570 --> 00:15:02,260

have a Fargus options.



231

00:15:02,280 --> 00:15:07,020

Now let me change it to six and then click on despite what's in here.



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As you can see here now I have six options here and now I just two for example just the name of the



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animal goes right.



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And an animation is like here in here and you can see this the next an image.



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And now let me actually select for example that I want to have on the white or I won't have only tame



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animals inside the Cooley's I just select these tame animal search box and then click on OK and then



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back.



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As you can see now it's going to only show us tame animals as you can see here.



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So I can't just for example select Dolfin and other animal as you can see here we have a horse right.



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So other options so let me actually change it to wild animals and then OK back as you can see here.



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Now he's going to show us all the wild animals as you can see here.



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So now let me change the background color of our application to white back.



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As you can see here now the back in uncolored of the application is white.



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Now let me change it to for example again Blache new changes are applied and in patch as you can see



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that back in uncolored is black.



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Now let me change that back in uncolored of our Queen to green and then let me click on put in here



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as you can see the back and uncolored is green as you can see here.



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Now let me change that back in on color of the Queen to read and now it says new changes are applied



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and click on.



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As you can see here the uncolored of our application is red.



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Now let me change the background color to blue.



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Now it says the new changes are applied.



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And I just need to click on dispatch button here at the top.



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Now you can see that the packet uncolored of the application is actually blue.



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Now let me ask you to change that by going on color to yellow.



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And now it says new changes are applied.



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And I just need to click on dispatch button here.



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As you can see here the baguette and color of the application is actually yellow.



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Let me change the font of the quiz.



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So for example I want to change the front of the text of the buttons to Fauntleroy but now I just want



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to select this option and then it says new changes are applied.



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And I just need to click on dispatch button here at the top as you can see.



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Now the phone is changed.



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So now let me change it to wunderbar demo click on back as you can see here.



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Now the font is changed so that sits.



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And I think we actually created our most complex Android application so far.



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And congratulations again.



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You have created a very great Android application and now it's your turn.



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Create a celebrity's cuius application and use that.



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Actually the principles that I taught you in this lesson in order to create that application upload



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that application to the Google Play Store.



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Give me the launch of your application into Google please.



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This is actually an assignment.



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So please do these assignments and I'm looking forward to it.



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So thank you very much for watching these tutorials.



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I am going to add more complex applications to this Course discourse is going to be the best and that



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overlap of course in your themi.



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So just be aware of that and stay tuned.



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And please if you have any questions if you have any problems please post the discussion in the course



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and then I'll do my my best to answer all of your questions.



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Thank you very much for watching and I'll.



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And I see in the next year's Oriol.