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Hi everyone in this story all you're going to master at the school like an android by creating a production



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ready Android application called martial arts club.



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So let's create that here.



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Let's start in your Android studio project for the application name just they've here had martial arts



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club martial arts club.



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And here we can specify the company domain.



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The package name and project location just click next here.



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Choose M.M. as the.



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Actually the AP 16 Android 4.1 tiddy been for phone and tablet.



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Just click on X here.



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Choose basic activity.



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This is very important because you want to actually use the menu feature here.



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Choose basic activity and then click next so you can specify the activity name layouts name title menu



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resource name.



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We do not want to use fragment in this application so do not check this checkbox here.



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Just click on finish.



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So now as you can see here our project is created.



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So let me actually switch to the Design tab.



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Here you can see our design here.



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This is our constraint layout and this is our Takes view at the center of this constrained layout.



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So here first of all we want to specify or actually many options.



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First let me actually run the application and here choose one of these devices.



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Just click on OK so here you can see that our application is running on the simulator.



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And here we have this hello world text view.



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Here we have these floats in action button which you are not going to use in this application so we



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need to delete this faluting action button and we also have this menu button here inside is actually



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Abdoulaye out.



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If I click on it you can see the settings here.



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So let's go to a hundred studio and here inside is lay out for that just double click on the activity



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underline minute example let's switch actually to Design tab and here let me zoom out a little bit so



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that we can see the entire actually the entire layout here so let me close this Properties window by



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just clicking on this.



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I can hear height and here I can select this fluting action button and then press on until key on my



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keyboard so it is deleted right.



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So let's go to.



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Let me actually show you the menu.



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So here inside this android view inside this folder we have this menu folder right.



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If I open it here you can see this menu.



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Underline minute exam in this example file is added to our project because we use the basic activity



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right.



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So if I double click on it here you can see the spaded basic activity here.



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So now let's switch to text tab here and now we can see that we have a menu and we have an item inside



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this menu.



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So this item is sitting right.



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If I show you the emulator.



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Now here you can see that if I click on this menu here you can see this option here.



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The item settings so we don't we don't want to use this item here inside our absolute's actually selected



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here.



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This item and the person behind your keyboard.



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Now let's double click on this tab here menu under the name and examine in order to make this about



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you there.



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So let's specify the items that we want to use inside our application.



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So the first item that we want to add to this menu is going to be a martial art item.



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So let's open attack here and just select item and now the first one is going to be the first actually



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attributes of this item is going to be the ID of this item so that we can actually leave first to the



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item from our main activity class from our job of so and do it call an ID.



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And here in say the coats choose this one as signed.



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Plus Id slash.



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And now we can specify the id the actual ID so the ID is going to be at underline martial art at Underland



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Marshall on the line art.



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So this is going to be the ID right.



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And here lets specify the text.



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The title of this item.



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So just type in here title and then select title here.



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So for the title just typing here at martial art the final attribute that you want to specify for the



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item is actually show as action.



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So we have some options here.



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If room always collapse action view never to be text.



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So what does this means that mean.



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Surely the issue here.



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What does this mean.



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So by the way if you can't see the autocomplete feature here these options in order to actually open



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these auto companies are here.



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You can hold down the control on your keyboard and then person space on your keyboard.



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So the first one is if.



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If that means that if there is enough space in sight on Apple layout it's going to show this item in



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sight.



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Apple layout always means that it's going to always actually show this item inside or the app or layout



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but again it's going to.



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It depends on the space that actually is on inside our upper left and we have this never never means



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that it's not going to never actually to show despite it inside an apple layout because we have actually.



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This Let me show you this ellipsis here.



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We have these free dots here.



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If I click on it here now it's going to show us this button in these settings item right so never means



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that.



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So let's choose Ephraim.



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OK now let's self close this item by just putting a slash and the ending tag here right.



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So this is our first item so let's add another item here.



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So that's open attack item and here we need to specify first the actually the ID switch statement here



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ID as science plus the slash.



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So the second item is going to be delete item delete actually Marshall that sort of statement here deletes



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underline martial art right and then create an inline here.



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So let's specify the title so the title is going to be delete the martial art and the final attribute



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is going to be the show as action again if you let yourself close this item here and then let's add



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another item so item.



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So the first attribute is going to be the ID and add site plus ID slash.



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And it is going to be up date underline martial art.



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So this is the ID and the title is going to be the update martial art.



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And here we have these.



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So let's actually change the title to update the martial arts.



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So now for the show as action attribute to step in here if room and let yourself close this item here



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by just putting slash and the closing tag.



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So for now these are free items in are enough.



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Let's run the application and lets see if this works or not.



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So now here we can see that we have an error and the error is because of the floating action button



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that we actually deleted inside our activity under the limited example.



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But inside our main activity class and inside these uncreate by faith we have these we have this block



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of code that is related to deflect from actually floating action button.



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So lets selectees these lines of Cahir and then personally the key on your keyboard.



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Let's run the app now let's choose one of these devices.



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So again it says that we have an error.



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So here the error is because of this method insert inside our main activity class here.



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If you remember inside our menu that meant menu that means that the Excel file be deleted the action



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settings item right.



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So here inside our main activity class inside is an option item selected Mefford.



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Here it is referring to that ID which doesn't exist anymore.



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So we need to actually also delete this piece of code.



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So now let's run the app again.



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Let me show you the emulator and now it works perfectly.



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So here you can see that there is actually enough space for this at Martial Art menu idea.



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Only for this taste right.



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But if you want to just see the other options you need to click on this dropdown menu here and you can



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see these other options.



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So you can see that we have actually a typo.



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Let's go to menu that magnetic Metafile.



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So let me add here let me run the app again.



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So here at Marshall let's open this dropdown here.



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Click on it so you can see that it's most martial art and updates the martial arts.



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So these are the other items.



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So now that we have these items we need to actually create some activities for these items.



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For example I want to create an activity for this at Martial Art item so that the user can create a



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martial art and add that martial art object to the light so that we can have that and we can actually



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save that that object to Escuela and we can later retrieved that object we can.



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We need to also create an activity for that deletes the martial art item and update the martial arts.



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So let's go to Andrew to you first class the first activity that we want to create is going to be at



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a martial arts.



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So let's open our view here let's open the adult view if you want to we can just click on view at the



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top tool windows and then click on Project.



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So now let's open the is a Java folder the first package is this package right.



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Let's open it here.



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Now I want to create another activity right click on this package new all you want to create an activity



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not a class.



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Right.



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So let's actually go to the activity here activity option and here you can see these options here right.



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Let's select this one empty activity.



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OK.



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Empty activity.



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So first it's going to ask us to specify the activity name the activity name is going to be at martial



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art at martial arts activity.



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So here the lay name is going to be activity on the island at Underland martial art.



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Right.



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So it's as if you you want this activity to be the to activity no I don't want this activity to be a



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lot of activity because the main activity class is actually the lunch activity.



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So I don't want this activity to be the luncher and it's ass backwards compatibility at.



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Yes.



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Make sure to check this checkbox so that we have backwards compatibility.



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Make sure that you can specify the package name but I don't recommend to actually change its package



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name because you want this activity to be in the same package that this main activity actually exists.



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So let's click on finish.



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So now the activity is created at martial arts activity extends of combat activity.



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We have this uncreate Meffert or write it for us automatically by Android studio.



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And it's a set content if you order to lay out that activity Underland martial arts so you can see that



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it also created an XML file for our layout.



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If I actually open this last folder here inside this last folder we have this activity Underland at



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Underland martial artist example.



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Right.



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And inside this let's go to them manifest.



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Why.



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Let's actually double click on it manifests year.



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You can see that it also created a new tag for our martial art activity class here in this application.



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So let's go back to our martial art activity here.



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Let's double click on this tab in order to make this area higher inside this uncreate Smurfette.



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Let's create a toast message here.



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Toast that make text to make text.



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So first we need to specify the context which is going to be the main activity that does come up and



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then the text is going to be.



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This is martial art activity karma and then the lenth is going to be short that show.



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Right.



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So here you can see that I passed the wrong context.



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Why.



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Because the context is at martial art activity not main activity.



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Here we are inside this at martial art activity.



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So the context it is actually at Martial activity.



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We are not inside the mind of the class.



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So this is the wrong context.



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So let's change it to add martial arts activity.



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This is the right context at much of the activity that this so why I say Atmar activity that these this



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refers to an instance of type at Martial activity when we run the application on an on an emulator.



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And when we want to for example Srishti this activity an instance of this activity is going to be created.



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So we need to revert to an instance of type at Marshal activity as a context here.



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So now it's time to go to the main activity class here and you can see that we have this main activity



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class this is our uncreate Mefford.



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And here we have this uncreate options menu here the Spirit is going to be called when the menu is going



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to be inflated on or actually Apple lay out.



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So it says just menu inflator that inflate our menu that menu that the underline may.



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So it is going to it is actually referring to our menu on it.



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I mean it is a small file and it is passing this menu argument here to this inflates Mefford.



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So it is going to specify this menu mean the same as the menu inside our Apple layout.



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So if it is necessary if you want to have these actually menu capability this menu feature inside your



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app out and we have this on options I'll let them select that method.



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So this is going to be actually called Vendy user touches one of the items of insight on menu.



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Right.



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So we have this item as the argument which is off the menu item here.



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Right on option items selected.



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So let's look at these comments it says handle action by item clicks here the action bar will automatically



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handle clicks on the home or up but up button.



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So long as you specify a parent activity and it manifests that Semmel.



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So let's delete these comments.



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We don't want to actually we don't want them to be here.



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Now we have only this these two lines of code here.



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The first one is and the idea that get ID.



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So it is getting the ID of a specific ID and insight on many.



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Let me show you the emulator so you can see that we have these items here right.



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So the first one at March were not he is actually an item.



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So Id them that get ID and ID is going to give us the ID of this item.



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And its going to assign ID to this body but because of that integer.



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Now we have this idea right.



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So if we can create a switch statement so lets look at this line of code here we can see that the return



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type of this method is of a bully and so we must return a value of a boolean from the it.



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So it is the return super that unofficial item selected item.



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So it is actually returning the return value of the Smurfette and the superclass.



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So the superclass of this main activity class.



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So this method calling here is going to do nothing.



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And that's why it is called here because it must retain the value of A.



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And it is passing the item here.



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So now let's after this none of what I'm going to actually just switch over to switch between the values



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of the ID valuable right and I can say Chase are thought Id dot at martial arts.



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Id call in.



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So what does this mean.



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This means that if the value of this ID value bet is actually at Martial Art ID here.



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So I am saying that if the user actually clicked or touched this item at martial art then I can say.



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So lets create an intent here intent and here I can say at Martial Art intent at Martial Art intent



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assignment operator new intent and now of this intent actually class has a constructor that accepts



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two arguments the first argument is going to be the context which is going to be main activity that



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does come up.



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The second argument is going to be the class that we want to transition to.



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So the second class is going to be a martial art activity at martial arts activity.



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That class this is really important that class semicolon.



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So let me create a new line here so that you can see this entire line of code here.



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Now I can see start activity and I just need to pass this outmuscled intent here.



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That's it.



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So after this case statement I'm going to say return true.



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So what is this return to roominess this retention means that do not execute any other codes after this



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case a statement if this case is true do not execute any other courts after this is Chasez statement



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because this is actually the case.



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True and I want to transition to another instance so it is not necessary to execute any other courts



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after this case statement.



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So return means actually it is a little bit like a plage statement here.



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Let's run the app and let's see if anything works fine or not.



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Let me show you the emulator so now the application is running on this emulator.



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Here let's click on at martial arts.



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Now you can see that we transitioned to this activity and you saw this TOSed message here.



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So let's go to our studio and let's go to.



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Actually the content underlayment and and here let's select this hello world takes you and then personality



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on our keyboard.



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We don't want that here.