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Hello everyone.



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So now here in this tutorial we're going to go ahead and we're going to provide an implementation for



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this method.



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Modify user interface.



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He had inside this main activity class.



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OK.



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So let's go inside the curly braces of this method.



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First are going to actually create an add a list of all martial art objects that we have insight or



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a skill like database so I can say aerialist and inside the angle brackets we need to specify the data



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type of the updates that we have inside these ideas which is going to be martial art the name of this



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artist is going to be all martial art objects assignment operator and in here I just need to refer to



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this database handler reference that return all objects semicolon.



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So let me create a new line here so that you can see what's going on here.



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Now I can create an if statement here.



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So if all Monserrat objects that size is actually greater than zero so this means that if there is actually



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a marshal object inside these Wrigley's here then you can go inside the curly braces of this if statement.



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So here first of all you want to refer to this scroll view that you have inside is content on.



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In that example scroll view that remove all views in layout.



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So why do I call this method here because I want it this actually.



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Every time they modify user interface it's called I want the views that are actually inside the scroll



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view to be removed first.



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OK.



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And then I want to add them at the newly actually updated marshal hot buttons to the scroll view.



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So after this line of code I can't say here let's create a greedily out secretely out and here the name



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is clearly an assignment operator new grittily out Kate.



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And here we just need to pass the context which is going to be main activity that this semicolon.



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So let's refer to this great layout that sits row count.



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Let's specify the number of rows that we're going to have in say discretely out said throw count.



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And here you can see that we need to pass a value of type integer as the number of rows of our great



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layout.



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Right.



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But here let me tell you that each row is going to have two columns.



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Right.



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So this means that many to have actually an even number we don't know how many martial arts actually



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emotional buttons we're going to have inside our layout inside our scroll here because we're getting



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these modular objects from the database from the SGI like.



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We don't know how many monster objects are there.



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So in that case this means that in order to specify the number of rows of our greatly out first we need



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to access the size of this Aurelia's.



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So let's put another pair of practices here and refer to these all martial art objects are a list here



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and just type in here that size and just put plus one.



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And then here the result of this operation here is going to be divided by two.



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That's why I said we need to have an even number for that for the columns of each row.



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Right.



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So for example assume that the size of this all Monserrat all Monserrat objects actually are a here.



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This radius is going to be for example nine.



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We have nine Montral objects inside this radius.



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Right.



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So according to this operation here nine plus one is going to be 10 right.



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So 10 divided by two is going to give us the value number five.



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So in this in this case we're going to have five rows that can have two columns each.



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So now imagine that we have 10 modular objects which is an even number right.



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Imagine that we have 10 martial artists inside this radius so 10 plus one is 11 right.



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So 11 divided by two is going to be a 10.



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What fight is going to give us 5 rows.



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Why.



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Because these sets count method needs a value of type integer.



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This means that we can only pass on value of that integer to this method.



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We cannot pass a value of type float to this method.



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And in other words if we pass a value that is actually the decimal decimal value to the Smurfit that



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this symbol value after the decimal point is going to be eliminated.



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This method needs only a value of type integer.



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So 11 divided by two is going to be again 5 and it's going to give us five rows.



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Right so that we can actually assign we can actually put our Monserrat buttons in each row.



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So for now if this doesn't make sense don't worry I'm going to explain it again later.



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For now I just write this formula here and now after this line of code let's specify the number of counts



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that actually the number of columns of each row so greatly that sets column count which is going to



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be number 2.



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And here let's create an array of marshal or partons.



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So I can say martial art but in and pulled up out of practice here and here's a snippet here that Button's



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assignment operator new martial art foughten and inside the brackets meaning to specify the size of



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this at eight.



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So according to the martial art objects that we have inside this Aurelia's we are going to specify the



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number of elements that we're going to have inside this at 8.



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So it is going to be all modular objects that size right semicolon that may create a new line here so



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that you can see what's going on here after this line of what I can't say because I want to be notified



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because this class main activity class is going to be notified when to use it interacts with the emotional



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buttons of this class marshal of this class.



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And if the class is good must actually implement the view and click the center interface.



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So let's scroll to the top here and here it says main activity extends up compact activity implements



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view that Uncle listener on click listener right.



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So because this class now is implementing this interface view that Dunkley class and Elvie must provide



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an implementation for the move here inside this class.



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So let's scroll down here.



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And before the end in curly brace of this class here main activity I can't just step in and click.



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So now you can see that we actually override this method here on Cleage So let's scroll through it up



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here and let's go to this actually to this method for user interface Meffert after distrain of code.



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Now feel are actually are greatly out with martial art.



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Partons So first let's create a variable of type integer and it is going to be the index assignment



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operator zero semicolon.



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And now let's create a for loop here so for and here I can say martial arts and the name of this valley



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of it is martial art object call an and let's actually iterate over the objects that we have inside



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this Aurelia's all objects.



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So let's open and closed this for loop by using these curly braces.



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So first of all let's create a martial art object for the index here that we created here of this idea



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of this martial art.



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So I can refer to this monster that buttons at a.



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And I put a pair of brackets here and inside the brackets I can refer to this index.



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Right.



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All you want to create are martial arts a button for the index of this array.



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So I can put an assignment operator here.



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Space assignment operator new martial art.



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But in this instance of type of button needs first we need to pass the context we are calling the constructor



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of this class right.



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First we need to pass the context which is going to be an activity that does come on.



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And then we need to pass the martial art here.



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Are specific martial art object which is going to be this one object.



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We have this variable here.



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So martial object cynical.



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Let me create a new line here.



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So that's it.



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And here let's specify the text of each martial arts button so I can say marshal hot buttons index dots



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sit Tick's.



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So first we're going to get the text of the martial art object and then we want to output the price



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of that martial art.



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So first I can say martial object that gets martial art name plus two coats Bideford slash n and then



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here I can say plus again Marshall object that get Marshall Price.



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And here you can see that if we get the Marshall name and the Marshall Price we also can output the



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ID of each module object so I can say a martial art object that gets that ID plus two quotes two quotes



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and then put a back for Slash in here and again put another concatenation operator.



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Let me create a new line here so that you can see what's going on here exactly.



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So you can see that for the text of each Marshlack button with first the output the ID of that martial



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art.



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And then we put our passports and hid in order to create a new line here.



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And then we say we want to output them.



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Marshall name Michael net.



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And then finally if you want to put there Marshall Price.



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So now after this line of code here I want to specify the color of each martial arts Potin.



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So I want to change the background color of each Marshall button according to the color that the user



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has specified.



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For example in say the update activity or inside the for example at marshal or activity class.



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So let's see how we can do that.



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Let's create an if statement here and I can refer to this modular object that gets martial arts color.



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If martial arts that get martial of color is for example equal to and I put on here I want to hard code



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this value I can see red I can do something about this one.



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Are you open and close this may for this statement.



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I use it by using the curly braces but instead of creating an if statement here it's better to create



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a switch statement let's delete this statement here.



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Now let's create a switch statement switch.



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And now I can refer to this monster object that gets martial arts color get rid of color.



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So I want to switch between the values of the color of each module object.



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Let's create and chase a case statement and here I can see a case and I can put two two quotes here



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because the return type of this method get Marshall that color is actually the string.



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Right.



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So I can't say that if the value the return type of this and that colored my head is actually red which



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is the return value actually if the returned value which is of type string is actually red.



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I can put a colon here.



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And now I can say that the marshal or buttons.



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And then I put a pair of brackets index doth sit baculum color set back in the color color.



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Dots red right.



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That's it.



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And that I can for example say bridge break means I actually break out of these suits.



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So it's going to go after the ending curly brace of these three separate statements and it's going to



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execute the other quotes here.



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So now after this case I can create another case.



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Case two coats for example blue co-lead.



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Here I can see Marshall hot buttons.



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And then I put in x year in the brackets that said background color that's a given color for example



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colored that's blue color that's blue right and then break.



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Let's create another case of statement so case two coats black.



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And I put a call in here and I can say martial art patents index that said background color color that's



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black.



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Break again.



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Chase two coats for example.



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The color yellow yellow color and Marshall buttons index that sets by color color dots yellow and then



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break.



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And here I can create another case.



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So case two coats.



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And for example the color of gray or the color purple I think purple colon.



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And here I can see Marshall patent's index that said color color.



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That's purple.



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So as you can see if you don't have the color purple here.



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So let's instead choose these colors you see on break.



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And in order to see what colors do we have here.



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So I just to refer to this color class that we have the blue green red and Ulfar you can see all these



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colors here.



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So we can actually create another Chase's segment for that green color so I can say chase two coats



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green color.



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I can't say Marsha that buttons index that sets the color color that green color.



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That's.



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And then here I just need to put a break statement here semicolon.



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And finally let's create a default case here.



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So default and if none of the cases above is actually true here I'm going to specify that the color



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of the pattern is going to be gray.



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So I can't say much about Patten's index that sits by Guaran color and here I can say color.



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That's great.



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That's it break.



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So now we can also create another case statement so before this default statement here I can see a case



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for example color two coats and the color is going to be for example white light white color Marshall



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pitance index that sits on color colored that flight.



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That's it.



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And then fraiche so I specify these colors here for each martial art pattern.



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So after the ending curly brace of these suits me here I can actually create some logic here.



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So here I specify the colors of each monster that pattern that I am still inside these for in loop here.



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OK.



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This is the ending curly brace of this for in loop here right.



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So before the ending calibers of this for in do you want to actually create a listener for each Marshall



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button.



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So I can see Marshlack buttons index that sits sits unclick listener and when it was past the context



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which is going to be main activity that this because this main activity class is implementing the view



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that unclick listener interface so we can pass this context here.



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And finally we need to add these Marshlack buttons to our great view.



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So I can say great view and truly great play out that view.



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So first we need to pass the child is going to be Monserrat buttons index.



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Right.



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And then we need to specify.



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So just put a comma here.



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Here we need to specify the width of each Marshlack button.



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So I already created a variable that actually holds the veto of the button so I can refer to that Monserrat



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button with Marshman or button with comma.



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And here I just need to specify the height of the martial art button so I change.



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I can see View group thoughts lay out perhaps thoughts wrapped content.



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So let me create a new line here so that you can see what's going on here exactly.



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First we specified that if are going to have a listener for each marginal object he had the button actually



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and that if we added these martial artists these martial patents to are greatly out here and we specify



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the beat and the height and here after the end and curly brace of this for in loop here I'm going to



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add this great play out this great you to our scroll view.



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So I can say scroll view that I view greed left.



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So before the end in curly brace of this if statement here the at this line of code here.



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Right.



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So this is RMF it modify user interface Smurfette.



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So let me tell you that we call this method inside the uncreate Smurfette modify user interface and



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we also want to call this method inside the resume method.



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So why do you want to call this method inside the presumed effect because when we actually for example



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transition to a delete activity there we can delete for example some of the objects some of the objects



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that we have inside our database.



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So in that case if the user goes back to the main activity there the uncreate method is not going to



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be called the did they all resume if it is going to be called.



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So you are already familiar with the app and realize lifecycle methods the uncreate and if it is going



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to be called for the first time for all or for example when the user actually runs the application.



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There are uncreate if it is going to be caught.



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But when the user transitions to other activities and goes back to their main activity the uncreate



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of it is not going to be caught.



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So the old resume if it is going to be called so we want to actually at the Create want to modify the



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user interface inside the resume effort when the user actually transitions to for example other activities



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and then goes back to the main activity.



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So it's better it's better to actually call this method inside our own resume if it too.



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So here let's scroll down here.



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And before the end in curly brace of this main activity class I can just step in here and resume.



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And here we can see that I override it this method on resume if this is a lifecycle method of Android.



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And here I can say modify user interface.



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Right.



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So if you don't understand why I actually called this misfitting So it is a resume if it don't already.



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Let me run the application and then I'm going to explain it again.



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So let's run the app now and here let's select one of these devices and then click on OK.



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So here you can see that our application is running on the simulator.



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I can actually scroll between these buttons here as you can see we have Marshall buttons and we can



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actually click on them here.



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Right.



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So you can see that the back end uncolored of all these modular buttons actually blue.



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Let's go to the update at demodulate activities here.



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So let's change for example the color of this one to.



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Right.



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And let's see we can modify and let's actually go back to our main activity here you can see that now



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the background color of this Marshlack pattern is red.



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Why.



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Because we call it.



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This may fit inside this honorees method.



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Right.



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So when we for example go to the update marshal activity class here if I click back here now and resume



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if it is called not the uncreate method but the resume if it is called.



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So that's why it is actually necessary to call this method modify user interface inside this on resume



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effort.



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So for example here as you can see when we actually click on these modular buttons here nothing happens



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right.



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So let's go back to android studio and let's pro-white and implementation some implementations here



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for this Anklage method.



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So let's go inside the Smurfit here.