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Hire we've done so now in this story we're going to go ahead and we're going to actually add a method



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to this at Marshall or activity class in order to add a martial art object to a school like database.



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So inside this class at martial art activity and after the end in the place of this uncreate method



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here let's create a method.



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So private Voyt and the name of this method is at martial art object at martial arts object to database.



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So let's put up tariff practices here and that open and closed the method by using this codebreakers.



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So first we want to actually get the value of the name of the martial art the price and the color from



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these edit texts.



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Right.



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We don't want to hard code the value of these are the properties the name the price and the color.



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You've got to get these values from these texts so I can say inside this Meffert let's create a variable



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is strange the name of this variable is name value assignment operator and I can refer to this EDT name.



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So it is the name that gettext to a string semicolon.



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Let's create another ridable Stream.



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And it is price value.



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Assignment operator it is a price that gettext the two.



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Semicolon strange color value assignment operator.



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It is the color that just text that to string semicolon.



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So now we have these variables right.



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Is local value is actually inside this method.



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Now let's actually use these values.



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First of all let me actually run the application first.



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Let's select this device and then click OK.



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And I can see that our application is running on the simulator.



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So here we have this menu item here right at Marshall and that's click on it.



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Now we transitioned to this activity here Monserrat name Marshall Price Marshall of color.



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So we are 100 percent sure that if the user enters a value inside this it takes we are going to actually



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convert that value to sync value and thats okay.



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But what about the price the price must be paid double.



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If the user enters a value inside these ediface it is going to be converted to a string value.



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Right.



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Because we can see these rowdier But here price value right.



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And if we cannot actually use that string value as a double value.



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So we need to actually create a try catch here.



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If the user enters For example a leader here for example if the user enters the leader here and if the



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user for example wants to add the martial arts into the database if the application is going to crash.



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So we need to actually catch the number format exception here.



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There is an exception here.



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So after these three lines of code here inside the Smurfette let's create a try catch block try and



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open and close this try block by using these curly braces and then Cheche insert Apprentice's of this



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catch block just open here.



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Exception e open and close this catch block by using these curly braces and just type in that print



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stack thrice inside is try block here.



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I'm going to convert these price value which is currently of type screen.



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OK.



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Is the price string value.



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I'm going to convert it to a double value so I can say double.



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And then here I can see price double value price double value assignment operator and I can refer to



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the double class double that parse double and then I just need to pass or value of type string to the



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smith at post-bubble which is going to be price value semicolon.



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If this line of code here goes wrong it's going to execute this catch block and our application is not



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going to crash it's going to just execute.



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It's going to just catch that exception and it's going to print something to the lock.



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So that's how we can actually prevent our application to crash by using these tripe.



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Tripe like statements this try catch blocks.



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So after this line of code here because we want to create or marshal or object and at that marshal object



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to our school database here we need to create a variable of type marshal.



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So I can say martial arts and the name of this valley is martial art object assignment operator.



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So let's say new martial art.



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So here we are creating an object of a martial art.



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First we need to pass the ID name price and the color so we know that the ID is actually the primary



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key auto increment.



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So we don't care about the id the ID is going to be specified automatically and it is going to be incremented



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automatically for us whenever we create a new object.



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So for the ID just pass the value zero comma.



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Now its time to specify the value for the name.



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So we have a variable for the name here right name value comma.



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Now we need to specify a value for the price so I can just pass this price double value here comma and



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finally a value for the color value.



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Thats a semicolon here.



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So name price color.



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So thats why we created these variables here.



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And we actually dont care about the ID so that it is on Marshall objects and it may create a new line



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here so that you can see these values better.



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So now that we have this motional object its time to add this monster that object to our database.



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First it will have actually a reference an instance of type database handler class.



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So let's scroll to the top here.



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Below this line of code that actually declares these buttons I can't see database handler and the name



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is database handler semicolon.



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Let's go into this uncreate Smurfette and after these lines of code I can initialize my database handler



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instance.



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So just refer to this instance to disvalue but as I'm an operator new database handler and here we just



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need to pass the context which is going to be at Marshal activity that this semicolon.



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So not just that our Insight is a database handler class we created or constructed.



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If you remember here.



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So this is all constructed and we said that this constructor accepts an argument of type context.



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So you can see that here.



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So let's go back to our outmuscle of activity class.



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And here we actually declare this variable of type database handler class.



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And inside these are created if for be initialized this variable.



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He had new data of his handler and it has this context now that we have this instance of a database



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handler inside this tripe block after creating this monster that object I can refer to this instance



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database handler and I can call the Smurfit at martial arts at Martial Art.



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And we just decide if it needs to and it's an argument of like Marshall Marshall object.



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Right.



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If I go to the state of his handler class you can see that we have the Smurfette at martial art in order



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to add a martial object to our school like database.



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So let's go back to our activity at much of the activity class and after this line of code I can create



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a toast message in order to let the user know that this martial art object is actually saved in a school



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database so toast that makes text first we need to pass the context which is going to be at the Monserrat



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activity that this come on.



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And that I mean to specify the takes.



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And here I can say this emotional object is a martial art object is saved to as few light database.



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OK come on.



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And then we need to specify the duration which is going to be short that show.



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Finally you need to call them short Meffert here on this object possumus close.



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So let me create a new line here so that you can see these values better.



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So now let's run the application.



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And let's see what happens.



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Let's select this emulator.



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Let me show you the emulator now so you can see that our application is running on the simulator let's



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click on at martial art.



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So for the martial art name let's say boxing martial art price for example 1000 martial art color.



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For example I just passed the value read.



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So let's clear cut at martial art as you can see nothing happened here.



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Why.



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Because first I want to actually I want you to pause the video and figure out the problem and when you're



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ready just continue with the video.



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Because here there is a technical problem here.



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We created this method here at martial art objects right.



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But we didn't actually call this method from anywhere inside our class.



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Right.



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So we can see that we have two buttons or you want this martial art object to to be added to the database



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when the user actually clicks on this button when the user touches this outmuscled button.



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So let's go to Android studio and here.



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Let's actually create a listener for our buttons.



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So after this line of code that actually creates a new instance of type database handler.



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OK I'll refer to this PTEN at martial art that sits on click listener and I just to pass the context.



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The context is at Marshal activity that this lets also create a listener for our PTEN patch.



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So Pythian back to set and click listener now and then here I just need to actually pass the context



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so it is going to be at martial arts activity to this.



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But here because we said that this class at Martial activity class is going to be the listener for the



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clicks or the touches that the user actually implements on the button.



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We need to this class must implement the view that uncle is an interface.



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Otherwise the compiler is going to complain.



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You can see that we have errors here so let's scroll to the top here.



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After this line of code here you can see that it says at Marcheline activity extends apcupsd activity



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implements view that unclick listener right.



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So because this class is implemented in this interface view that unclick listener diskless must provide



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an implementation for the unclear method.



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00:10:11,690 --> 00:10:13,030

So let's scroll down here.



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And before the end in place of this class here this martial art is actually at Martial of activity class



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00:10:20,290 --> 00:10:24,680

or just to type in hit and click and you can see that the autocomplete feature of Android studio is



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helping us to choose the Smurfette so select it and then personated on your keyboard.



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00:10:28,040 --> 00:10:30,700

Inside is Uncle Meffert because we have two buttons.



146

00:10:30,700 --> 00:10:33,140

We need to differentiate between these buttons.



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So let's first change these arguments name to view.



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And here I can create a switch statement.



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Right so each and here I can refer to the view that gets ID.



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So let's open and close this switch statement by using the curly braces case.



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00:10:48,170 --> 00:10:53,230

And here I can see all that ID that PTEN at martial arts.



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Colon.



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00:10:54,590 --> 00:10:54,970

OK.



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And then here let's create a new line here.



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00:10:57,650 --> 00:11:04,040

So here I am saying that switch between the values of the ID of this view also view is the user interface



156

00:11:04,040 --> 00:11:07,490

component that is actually the tree getting to this unclick method.



157

00:11:07,520 --> 00:11:08,050

OK.



158

00:11:08,060 --> 00:11:11,840

When the user touches the button the button is a subclass of view.



159

00:11:11,840 --> 00:11:12,200

Right.



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00:11:12,320 --> 00:11:18,470

So any use that has this spot in this argument here is the user interface component or the button that



161

00:11:18,470 --> 00:11:20,210

is actually triggering the action.



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00:11:20,210 --> 00:11:26,690

So here we are checking that if the view that good ID is actually PTEN martial arts in that case we



163

00:11:26,740 --> 00:11:29,780

are going to call this method this method that he created.



164

00:11:29,780 --> 00:11:35,240

He had an alternate object database so I couldn't see at Marshall that object to that of his approach.



165

00:11:35,300 --> 00:11:35,720

Right.



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00:11:35,720 --> 00:11:37,730

So let's run the application now.



167

00:11:37,790 --> 00:11:39,100

Let me show you the emulator.



168

00:11:39,200 --> 00:11:40,730

Let's click on at martial art.



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So for the martial arts name I can't say again boxing martial art.



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Price one thousand martial art color red.



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00:11:49,010 --> 00:11:50,440

Let's going to court martial art.



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00:11:50,540 --> 00:11:55,300

Now it says this martial art object is saved to a school like stop a slide.



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00:11:55,370 --> 00:12:03,830

So now when the user actually clicks or touches this back button I want this activity to be actually



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eliminated.



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00:12:04,400 --> 00:12:06,650

So let's go back to android sitio.



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And here you can see that we have the switch statement and we here we have this case right.



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So let's create another case statement case our thoughts ID that PTEN go back colon and this time we



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want to actually finish.



179

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We've got to call the finish my faith on an instance of outmuscle activity.



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So it is actually the start to finish this finish.



181

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This refers to an instance of type martial art activity.



182

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So when I say this that finish this activity is going to actually be eliminated and the activity below



183

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this activity which is actually the main activity is going to be shown to the user.



184

00:12:45,890 --> 00:12:46,440

Right.



185

00:12:46,790 --> 00:12:49,760

So now I can say bridge.



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00:12:50,010 --> 00:12:51,460

Let's run the app now.



187

00:12:52,500 --> 00:12:58,260

Let me show you the emulator let's look at martial art if I click on patch.



188

00:12:58,290 --> 00:13:01,290

Now you can see that we have this activity here.



189

00:13:01,380 --> 00:13:03,930

Let's actually add another functionality to this application.



190

00:13:03,930 --> 00:13:09,600

Let's go to the Android studio and inside this martial art class I can override the twisting method



191

00:13:09,870 --> 00:13:12,910

that this class actually inherits from the object class.



192

00:13:13,110 --> 00:13:16,140

So let's scroll down here and here I can say two streams.



193

00:13:16,200 --> 00:13:23,190

So let's delete this value here written superlative string here because I want to put my own implementation



194

00:13:23,220 --> 00:13:24,210

of this method here.



195

00:13:24,210 --> 00:13:31,650

So now I can say return and here you can see that we have this instance variables these getters and



196

00:13:31,740 --> 00:13:32,630

setters right.



197

00:13:32,850 --> 00:13:34,760

So I can't say name price and color.



198

00:13:34,770 --> 00:13:36,520

I want to return these values.



199

00:13:36,570 --> 00:13:40,090

So first I want to return the name return.



200

00:13:40,110 --> 00:13:49,710

Get Marshlack name plus two coats for a slash in a newline character plus get martial art price plus



201

00:13:50,160 --> 00:13:55,700

two coats by Slash and plus get martial art.



202

00:13:55,740 --> 00:13:58,050

Actually color semicolon.



203

00:13:58,410 --> 00:14:06,660

So let's go to our martial art activity class and here for this Toastmasters I can't delete this value



204

00:14:06,660 --> 00:14:07,570

here.



205

00:14:07,710 --> 00:14:14,820

I can say actually when I refer to the smart object here I want to out with the string value of this



206

00:14:15,180 --> 00:14:17,610

object to the screen.



207

00:14:18,030 --> 00:14:23,790

The string method of this object is going to be called automatically right because I want to convert



208

00:14:23,850 --> 00:14:27,410

this value to a string value so the string method of this object is going to be called.



209

00:14:27,540 --> 00:14:31,950

So here I just need to say I just need to put on a concatenation operator.



210

00:14:31,950 --> 00:14:33,160

Here are two quotes.



211

00:14:33,170 --> 00:14:45,330

And here I just need to put a space so I can't say Marshall Marshall object martial art object is added



212

00:14:45,990 --> 00:14:47,150

to database.



213

00:14:47,160 --> 00:14:48,840

Let's run the application now.



214

00:14:49,650 --> 00:14:50,970

Let me show you the emulator.



215

00:14:51,000 --> 00:14:53,850

So let's click on at martial art for the martial art name.



216

00:14:53,850 --> 00:14:54,840

Just type in here.



217

00:14:54,870 --> 00:14:56,090

Boxing martial art.



218

00:14:56,100 --> 00:14:57,380

Price 2000.



219

00:14:57,810 --> 00:14:58,230

Martial Art.



220

00:14:58,230 --> 00:14:59,510

Color Blue.



221

00:15:00,030 --> 00:15:00,880

Let's go.



222

00:15:00,990 --> 00:15:01,920

So let's click on.



223

00:15:01,970 --> 00:15:04,370

At martial art now it's boxing.



224

00:15:04,410 --> 00:15:08,030

These values is added to the database.



225

00:15:08,070 --> 00:15:09,170

If I click on it again.



226

00:15:09,300 --> 00:15:12,550

Now you can see that another object with these values is added to that database.



227

00:15:12,630 --> 00:15:16,120

If I click on it again you can see that message here.



228

00:15:16,200 --> 00:15:17,110

So that's it.



229

00:15:17,120 --> 00:15:21,660

And I think that's enough for the search for you and for this activity at Marshal activity in the next



230

00:15:21,660 --> 00:15:25,290

story we're going to actually work with other activities of this application.



231

00:15:25,320 --> 00:15:30,360

So if you have any questions about the concepts that I taught you in this lesson please post the discussion



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in the course and then I do my best science and all of your questions.



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Thank you very much for watching and I'll see you in the next story.