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Welcome back.

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Our app is missing a very important feature, and that is to display the information that should be

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displayed here once we click on one of the elements.

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So how do we get the information from one screen to another?

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Well, one of the options is, of course, to use put extra to an intent, and that's exactly what we're

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going to do.

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So let's go ahead and go to our main activity and end our setup happy place recycler view function that

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we had this set list for our places adapter and there we had this unclick, which we implemented last

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video.

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Now, before I start the activity, I would like to put something in the Internet.

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So I would like to put some extra information to the intent.

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And I'm going to call this one extra place details.

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And what I'm going to pass is the model.

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All right.

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So this extra put extra method, as you can see, it requires a string, which is the identifier, so

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to speak, and then a bunch of different other types of information that you can pass.

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It can pass integers, you can pass doubles and so forth.

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So you could pass any different type of information.

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But the thing is, what I want to pass is a whole object.

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All right.

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So let's create this variable real quick in our companion object here for is going to be extra place

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details.

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So it will be identifiable, so the extra information that we're putting, because we could put a lot

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of different information.

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OK, but now it's still complaining and that is because it doesn't understand what it should do with

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our model, because our model is an object of a class that we created ourselves and put extra requires.

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You could see data types that it can read.

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So, for example, something that a serializable, that's exactly what we're going to use.

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So let's go ahead and make our model or our class serializable.

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So let's go to our Happy Place model and make this data class.

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Syria sliceable that will allow us to do is it allows us to pass it to our intent.

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So basically what Serializable does is serializable will bring it into a format which we can pass from

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one class to another.

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All right.

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So that is simply very powerful.

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It's also used in order to save an object.

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OK, so if you want to store an object of a class, then you can store it in a serializable way as well.

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But that is a little different of a topic.

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But basically that is how we can pass the information.

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But now, of course, that is just one step of it because we also need to retrieve it.

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So let's retrieve it.

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And where would that be?

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Well, in our happy place detail activity, because that's where we are going to need it.

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So let's go ahead and.

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Create an object of our happy place model, so far, a happy place detail model will be our happy place

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model Nullable and then we check if the Internet has information, so has extra.

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Called main activity, that extra place detail, we called it like that, as you can see in our main

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activity, this is our companion object variable, this static variable that we have here that we now

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can use and can see if it has this specific name, then do something with it.

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So we're saying, OK, does it have an extra which has this name?

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And if it does, then run some code and that's what we're doing here.

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So we're saying assign the intense get a serializable extra main activity that.

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Extra heavy police detail as a happy place model, because it's not going to be in the form of a happy

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place model, so we want to cast it to be one.

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All right.

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So now it's going to be one.

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So now that we have assigned it, we can check is our happy place model or detail model not empty,

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so happy place model, not now.

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Then.

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We want to have an actual bar at the top, so I'm just going to use the tool bar, Happy Place Detail

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Action Bar.

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Then I'm going to say that it is going to be or it's going to have this back button, so support action

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bar.

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Set display home as unable to I'm going to say that's true.

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And then I'm going to set its title.

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So Support Action Bar, the title is going to be a happy place model the title.

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So whatever we had as the title in our happy place model.

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So the string here, that's going to be the title of our action bar.

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So instead of just having a happy place detail, as we currently have called it.

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So here.

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Our.

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Very top here hour toolbar, the current text is.

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We even have a text here.

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Actually, we don't have a text here, so now it's going to get a text, which is going to be the title

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of the Happy Place detail model.

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And then what should happen once we click on this thing?

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Well, then we want to set it as back pressed.

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OK, so once we click on our navigation element here, set navigation, I'll click listener on back

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pressed should be called OK.

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And at this point we can go ahead.

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And assign all of the different.

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Details here, so all of the different information, such as which image to use, which text to use

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and so forth, because we have here a complete image of you, which is Ivy Place image.

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This is the one that we want to populate with the image of the element that we clicked on.

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So here, if we click on this one, we want to have Holmer.

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So here, this image here should be Homerton.

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All right, so let's assign it let's go ahead and say on the score place image, that set image.

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So how did we store it?

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Well, we store the image as a string, which means we store it as a link.

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So we started as a you are I, so to speak.

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So set image, you are right.

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Which will be your parts, because now we need to bring it back into a URAI format and that will be

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our happy place detail model.

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Dot image.

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And of course, we need to import Urai, so let's do that real quick here, import this and now we can

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go ahead and set the same for our text here, of course.

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So what was the name of our description text here?

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I think TV description.

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So let's look at it yet.

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It was TV description, so let's use that.

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So let's set its text to Happy Place model is a model to be precise and description.

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And then TV underscore what we have OK with location.

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Text is going to be our happy place detail model location.

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All right, so now we can test that and see if it's actually going to work.

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And then while it's running, I want to also talk about a little other aspect of using our serializable.

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So serializable is one way, but there is another option for this.

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And we're going to look at that in a second.

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So first of all, let's test it, let's click on Holmer and we could see the Holmer image is populated.

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The test description and test location are the text here.

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So that worked flawlessly.

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Perfect.

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All right, and it's quick enough, right?

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But then when developing this, I came across Pasodoble versus Serializable, and that is something

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that you always can do, you can always improve your coding or your performance of your app.

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And of course, at one point, it doesn't really matter that much because in our case, I mean, the

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application is fast enough, right?

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So it's super fast even in the emulator, which is a super slow device.

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But still, if you look at it, there is an alternative to serializable, which is called personable.

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And you can check out this article here.

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But basically what he says is that using Soheir Pasodoble versus serializable and he says that using

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pasodoble is going to be significantly faster than using serializable.

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So it is like 10 times faster.

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All right.

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So let's try that.

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So how we do we make this happy place model Pasodoble?

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Well, you can just use Parcell Bolt here the keyword, and then it's going to complain, it's going

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to say, OK, you need to implement pasodoble methods and stuff.

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So let's let's add this implementation.

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You can see and add this constructor, but then it's complaining because strings need to be nullable

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for this to work.

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So let's add a bunch of question marks here for our strings so that it's not complaining anymore.

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All right.

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So once we've done that, the next thing we need to do is, of course, to go to our main activity where

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we passed in this detail and we started this.

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Intent, let's have a look can see.

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OK, so we put it Ekstrom and our put extra, it doesn't care if it's a pasodoble or if it's a as you

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can see in this case, it directly shows us the pasodoble option.

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But there is also one, which, of course, is the serializable that we used before.

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But now it's automatically going to use to pass the little option.

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And then the next thing we need to do is to check out the happy place, detail activity, because here

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we used to intend to get serializable of extra.

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So now I'm just going to use get Pasodoble Extra.

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And that's going to be it.

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So that's just another way of using objects that you want to pass around between different activities

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so you can use whatever way you prefer.

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I mean, serializable was the easier one, so to speak, but it's the less performant one.

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So if you really want to improve the performance of your application, then you can use Pasodoble here.

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And then, of course, when you do these changes, it's important to test if it's still going to work.

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And as you can see, it still seems to work totally fine.

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All right, so that was it for this video.

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Now you know how you can pass around the whole objects from one activity to another and you can use

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it there in order to populate, for example, your UI.

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And that will be super handy because you will need that functionality quite often.

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All right.

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So see you in the next video.