1

00:00:00,690 --> 00:00:05,680

So as you can see here these are the lines of code that I pasted here.



2

00:00:05,850 --> 00:00:11,430

So now let's run our project but before that we need to actually comment out this line of code here



3

00:00:11,970 --> 00:00:14,580

and now we can actually run our project.



4

00:00:14,580 --> 00:00:21,220

So as you can see here our application is running on this emulator here and if we actually want to.



5

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Let me add to be selective edits here and now I can actually assign a numeric value here so that's value



6

00:00:27,420 --> 00:00:31,130

is going to be divided by 100 that I actually am against it.



7

00:00:31,140 --> 00:00:35,070

I put this line of code here in order to divide that value by 100.



8

00:00:35,220 --> 00:00:38,530

As soon as I assign that value into the edit text.



9

00:00:38,580 --> 00:00:44,010

So here as you can see we have this value for example 500 is now $5 right.



10

00:00:44,160 --> 00:00:50,850

So $5 and here $5 is actually the value of the spill amount and that value is going to be assigned to



11

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the bill amount.



12

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So this is that value right.



13

00:00:55,020 --> 00:00:57,050

So hopefully that makes sense.



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And now if the user actually enters a non-numeric value on that as it takes here we can actually catch



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that exception.



16

00:01:06,570 --> 00:01:07,030

OK.



17

00:01:07,260 --> 00:01:13,620

So if the user enters on a non-numeric value in that inside that edit takes here it's going to actually



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throw this number form an exception here.



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So we actually put this catch block here in order to catch that exception.



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And then the Apple application is not going to crash.



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00:01:24,420 --> 00:01:29,880

So in light 93 I when I truly said the text of this text the bill amount to an empty value as you can



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see here and here you are actually assigning the value zero point zero to our bill amount.



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OK.



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So this block of code here is going to it is going to be executed if our text is actually empty or if



25

00:01:41,520 --> 00:01:46,140

the user actually enters a non-numerical value inside that Eadie text.



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So now let's actually uncomment this line of code here and here I need to actually create a handler



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46 percent as you can see here.



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Tepes part changelessness right.



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00:01:57,930 --> 00:02:03,120

So here after the end in Kerley place of this table takes the water handler here as you can see it to



30

00:02:03,120 --> 00:02:06,110

actually create a handler for that Sebald percent.



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So now I'm going to paste in some lines of code here and then I'm going to explain to you what's going



32

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on here.



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So let's actually write this handler by hand here.



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So just type in here Plevna its final and here just type in search bar dot on See Spot change listener.



35

00:02:25,930 --> 00:02:28,500

And now you need to specify the name of this handler.



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So as you can see here via specified that name here keep C.P.R. change the center of just copy this



37

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value here and then just put this value here and put an assignment operator here.



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00:02:40,880 --> 00:02:46,130

You on Six-Party change list and also as you can see here we have this option here.



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00:02:46,140 --> 00:02:49,300

Just select this option and then present in Turkey on your keyboard.



40

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And now as you can see here the ID actually put these lines of code here automatically for us.



41

00:02:54,690 --> 00:02:56,250

So here as you can see we have an error.



42

00:02:56,250 --> 00:03:03,910

So at the end actually the after the ending curly brace of this handler of these it's Tepes each bar



43

00:03:03,910 --> 00:03:07,020

change to the Senate you need to actually put a semicolon.



44

00:03:07,320 --> 00:03:09,150

Now as you can see we have some efforts here.



45

00:03:09,150 --> 00:03:11,460

The first one is unprogressive changed.



46

00:03:11,670 --> 00:03:17,540

The second one is on start tracking touch and the first one is unstop tracking touch.



47

00:03:17,550 --> 00:03:18,200

Right.



48

00:03:18,240 --> 00:03:21,360

We need to use the Smurfette on progress changed.



49

00:03:21,360 --> 00:03:21,800

OK.



50

00:03:21,900 --> 00:03:23,100

So let's actually choose this.



51

00:03:23,130 --> 00:03:26,010

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



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00:03:26,130 --> 00:03:31,440

And now I'm going to pasting some lines of code here inside this on progress change method and then



53

00:03:31,440 --> 00:03:33,950

I'm going to explain to you what's going on here.



54

00:03:34,170 --> 00:03:37,870

So here as you can see this is the line of code that I pasted here.



55

00:03:38,100 --> 00:03:41,730

And are you referring to the name of this 3 percent variable.



56

00:03:41,880 --> 00:03:43,480

So let's look at our class here.



57

00:03:43,500 --> 00:03:49,110

As you can see I actually created this 3 percent variable which is actually type double here in line



58

00:03:49,110 --> 00:03:53,910

21 and I assigned these values 0.25 to this value.



59

00:03:53,920 --> 00:03:56,570

But for the first value right.



60

00:03:56,910 --> 00:04:00,230

As you can see here I initialized this valuable by disvalue.



61

00:04:00,540 --> 00:04:03,060

And now let's go back to our method here again.



62

00:04:03,300 --> 00:04:05,810

And here you refer to the name of this progress here.



63

00:04:05,820 --> 00:04:10,270

As you can see so many use for example 6 on that CPR.



64

00:04:10,290 --> 00:04:12,380

So let's open our emulator here.



65

00:04:12,510 --> 00:04:18,240

When we use them for example 6 on this six but we can actually get that integer value.



66

00:04:18,360 --> 00:04:18,960

OK.



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00:04:19,170 --> 00:04:24,450

In the previous section of this course I talked about this part and how you can actually get that integer



68

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value by using this argument and that he had because I want to actually convert that value to a person's



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value.



70

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I actually divided that value by 100 here.



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Right.



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So progress divided by one hundred point zero.



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So now it's actually assigned that the result of this operation is the person here and now as you can



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see we have two other MFX which we don't use them but we need to we need to override them here.



75

00:04:52,620 --> 00:04:56,690

So now as you can see here we have these actually these handlers.



76

00:04:56,880 --> 00:05:01,810

And here we need to create another method and then I'll talk about that Nefert here.



77

00:05:01,950 --> 00:05:06,570

So first let me actually paste this method here and then I'm going to explain to you what's going on



78

00:05:06,570 --> 00:05:07,340

here.



79

00:05:07,350 --> 00:05:11,990

So as you can see here these are the lines of code that I pasted here.



80

00:05:12,120 --> 00:05:18,840

So the access modifier of my method is actually private the return type of My method is void and the



81

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name of my method is actually the calculate type and decide if it actually accepts no arguments.



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00:05:24,930 --> 00:05:29,150

So now let's actually to go inside the body of this method and let's see what's going on here.



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00:05:29,460 --> 00:05:35,320

First of all in line one hundred and fifty I actually referred to the name of this takes.



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00:05:35,330 --> 00:05:37,880

You object to 63 percent.



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00:05:37,890 --> 00:05:39,720

So let's go inside our class.



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00:05:39,740 --> 00:05:45,780

Main activity and here as you can see if we have this object we actually declare this object here to



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60 percent.



88

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And this is of type takes you right.



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So here you can see inside is uncreate me they're actually initialized.



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This takes 30 percent.



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00:05:55,350 --> 00:05:58,750

And if you want to show you that in a emulator.



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00:05:59,100 --> 00:06:04,230

So here it is our emulator and here is this 80 percent right.



93

00:06:04,260 --> 00:06:11,210

So now inside these calculated Meffert I am actually setting the text of this 80 percent.



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00:06:11,310 --> 00:06:15,330

So to 60 percent that said text present format value.



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00:06:15,480 --> 00:06:20,850

So here are you referred to the name of this object that I actually created inside this main activity



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class.



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00:06:21,720 --> 00:06:27,150

So as you can see here in say this main activity class I created this object per cent format's value



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which is a type number format.



99

00:06:29,340 --> 00:06:35,040

And here as you can see I initialized this number format here as you can see this number for my object



100

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by typing number format.



101

00:06:37,300 --> 00:06:39,790

I've referred to the name of this class number format.



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And I actually called this strategem if it gets percent instance so this dispersant instance is going



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to ask you to return an instance of type number format and then it's going to actually return this present



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instance and that instance is going to be assigned to dispersant format's value.



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00:06:58,260 --> 00:07:02,300

So now let's go inside this calculated method here.



106

00:07:02,570 --> 00:07:08,600

And now here as you can see I referred to the name of this person's format's value data format.



107

00:07:08,640 --> 00:07:12,290

So I actually called this method on this object person format's value.



108

00:07:12,510 --> 00:07:15,730

And then I passed this t percent.



109

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So as you can see here we actually declared this this person here this person inside this may mean activity



110

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class.



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00:07:23,160 --> 00:07:30,870

I actually created this 80 percent here and I assign this value 0.25 as an initial value to this valuable



112

00:07:30,960 --> 00:07:31,470

person.



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00:07:31,470 --> 00:07:32,100

Right.



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00:07:32,460 --> 00:07:39,210

And then here as you can see inside this inside this on progress changed Smurfette as you can see I



115

00:07:39,210 --> 00:07:44,070

actually assigned another value to this 80 percent variable progress.



116

00:07:44,070 --> 00:07:49,000

So here I referred to the name of this progress argument divided by 100.



117

00:07:49,140 --> 00:07:49,790

OK.



118

00:07:50,160 --> 00:07:53,880

So for example when you use that are two to six on this sick bar here.



119

00:07:54,030 --> 00:08:00,660

It's going to actually give us an integer value and then it's going to divide that value by 100.



120

00:08:00,690 --> 00:08:06,810

As you can see here and then we can have actually a pair sent by the right because I want to convert



121

00:08:06,870 --> 00:08:08,280

that value to a person's value.



122

00:08:08,310 --> 00:08:13,720

So we need to divide that value to a 100 and then I assign that value to these two percent.



123

00:08:13,800 --> 00:08:14,250

OK.



124

00:08:14,370 --> 00:08:17,550

So if any use changes the value of the sick part.



125

00:08:17,640 --> 00:08:20,490

Now I actually assign that value to wristy percent.



126

00:08:20,490 --> 00:08:23,980

So this person now holds that value right.



127

00:08:24,000 --> 00:08:30,740

So here inside our calculated method we can actually use that value 80 percent in order to set the text



128

00:08:30,760 --> 00:08:31,980

of this to 60 percent.



129

00:08:31,980 --> 00:08:37,920

So the excessive 80 percent that's it takes per cent format's value that format.



130

00:08:37,980 --> 00:08:45,420

So this Meffert format is going to actually give us the specific format of that specific actually for



131

00:08:45,420 --> 00:08:50,920

example Chaddock their percent that is actually regarded to our specific locale.



132

00:08:51,000 --> 00:08:51,260

Okay.



133

00:08:51,270 --> 00:08:56,700

So for example when the user is actually in a country in the U.S. or in Europe it can actually give



134

00:08:56,700 --> 00:09:02,630

us a specific character that is actually a look at that specific to those locales.



135

00:09:02,640 --> 00:09:03,140

OK.



136

00:09:03,360 --> 00:09:06,170

But here in the U.S. this is this person's character.



137

00:09:06,210 --> 00:09:09,870

So we use this up person character as you can see here.



138

00:09:09,880 --> 00:09:13,560

So person for value that format type person.



139

00:09:13,560 --> 00:09:14,320

Right.



140

00:09:14,840 --> 00:09:21,480

And now as you can see here this remember that this formats MFL is going to return a string value.



141

00:09:21,600 --> 00:09:27,840

So we can assign value here this person here into this into the practices of this text.



142

00:09:27,900 --> 00:09:31,550

So it takes some effort and in line 152.



143

00:09:31,770 --> 00:09:38,410

I actually created a variable of type double and the name of this value is actually the tip value.



144

00:09:38,430 --> 00:09:42,450

OK so now I want to actually get the tip value and assign that value here.



145

00:09:42,690 --> 00:09:45,520

So double tip value assignment operator.



146

00:09:45,900 --> 00:09:51,990

And then I referred to the name of this bill amount variable that I created inside this main activity



147

00:09:51,990 --> 00:09:52,710

class.



148

00:09:52,710 --> 00:09:58,330

So inside this main main activity class we have this bill outwardly about right and I assigned this



149

00:09:58,350 --> 00:10:02,490

value zero point it all to this amount of valuable.



150

00:10:02,900 --> 00:10:11,780

So here as you can see inside these antics the changed Mefford that is actually related to this interface



151

00:10:11,780 --> 00:10:17,180

takes whatever we can see that here I am actually assigning another value to the spill amount double



152

00:10:17,180 --> 00:10:19,120

that part double is that was thrilling.



153

00:10:19,120 --> 00:10:25,280

So for example if the user assigns a value into these edits here for example 1000.



154

00:10:25,730 --> 00:10:30,270

So here this is the value of this amount as you can see here.



155

00:10:30,710 --> 00:10:36,830

And then here it's going actually after we assign that value into it it takes it's going to actually



156

00:10:36,890 --> 00:10:41,930

add that value to this takes the bid amount to CTX the bill amount that takes currency from value that



157

00:10:41,930 --> 00:10:43,520

formats bill amount.



158

00:10:43,520 --> 00:10:49,910

So now the value of this bill amount is the value that we actually assign here divided by 100.



159

00:10:49,910 --> 00:10:52,280

So now that is actually put for example number two.



160

00:10:52,370 --> 00:10:58,370

Soon as we can see here as soon as I assign the value numbers to interest it takes here it's going to



161

00:10:58,370 --> 00:11:00,500

divide that number two by 100.



162

00:11:00,620 --> 00:11:06,560

So that's what you can see the value here zero point zero to right this value was two and then it is



163

00:11:06,560 --> 00:11:08,800

actually a divided by one hundred.



164

00:11:08,840 --> 00:11:15,680

And now it is zero point zero two and then it's going to actually put that value into these peaks the



165

00:11:15,880 --> 00:11:17,010

amount here.



166

00:11:17,020 --> 00:11:17,500

Right.



167

00:11:17,510 --> 00:11:20,470

Currency format value that format amount.



168

00:11:20,540 --> 00:11:23,420

So now this bill amount has this value for example.



169

00:11:23,420 --> 00:11:28,540

Now can I should I want to assign up for example the value of 200.



170

00:11:29,120 --> 00:11:31,610

So I need to put the right value here.



171

00:11:31,610 --> 00:11:37,560

For example we have two hundred dollars and now the value of this bill amount is actually 200 right.



172

00:11:37,580 --> 00:11:40,700

So here inside this calculator tip F-ed.



173

00:11:41,060 --> 00:11:46,000

When I created this variable which is of type double type value assignment operator bill amount.



174

00:11:46,010 --> 00:11:49,190

So now for example the value of this bid amount is two hundred.



175

00:11:49,430 --> 00:11:54,210

And then it's going to actually multiply these 200 by this 2 percent.



176

00:11:54,230 --> 00:11:58,450

So this person actually holds the value of this search bar here.



177

00:11:58,550 --> 00:11:59,040

OK.



178

00:11:59,150 --> 00:12:06,590

So for example the user wants to pay 40 percent of the actually the meals that they actually ate.



179

00:12:06,590 --> 00:12:09,780

So here we can actually put that value here.



180

00:12:09,980 --> 00:12:13,490

And then you can actually use that value here to present.



181

00:12:13,490 --> 00:12:18,540

So now let's actually run our project here at this point because I want to show you an important point



182

00:12:19,710 --> 00:12:24,960

so it's going to actually multiply the value of this spill amount which is now two hundred by disvalue



183

00:12:24,960 --> 00:12:25,920

80 percent.



184

00:12:25,980 --> 00:12:32,670

For example 80 percent and the value of the 80 person is for example of 25 percent and then it's going



185

00:12:32,670 --> 00:12:34,510

to assign that value to the steep value.



186

00:12:34,650 --> 00:12:35,110

OK.



187

00:12:35,220 --> 00:12:39,390

And that value is going to be the tip value that the user should pay in line.



188

00:12:39,390 --> 00:12:40,710

One hundred and fifty.



189

00:12:40,910 --> 00:12:47,150

We actually created another variable in order to calculate the total value that the user should pay.



190

00:12:47,310 --> 00:12:49,880

So double total value assignment operator.



191

00:12:50,010 --> 00:12:52,770

And then here you referred to the name of this bill amount.



192

00:12:52,770 --> 00:12:55,650

For example 200 plus tip value.



193

00:12:55,830 --> 00:12:58,690

And this is the total value that the user should pay.



194

00:12:59,100 --> 00:13:05,160

And here in line one hundred and fifty five I'll refer to the name of the state's beauty tip that said



195

00:13:05,190 --> 00:13:05,830

text.



196

00:13:06,000 --> 00:13:11,760

So here I'll refer to the name of this place with you is to keep the state's currency format value that



197

00:13:11,790 --> 00:13:14,440

format type value.



198

00:13:14,850 --> 00:13:22,310

OK currency formats value that format is going to actually return a specific format of data.



199

00:13:22,530 --> 00:13:24,630

For example value type value.



200

00:13:24,990 --> 00:13:31,160

According to that specific locale that is actually that is actually set up in that in the user's device.



201

00:13:31,200 --> 00:13:31,730

OK.



202

00:13:31,980 --> 00:13:34,260

So now it's going to return that value.



203

00:13:34,470 --> 00:13:38,210

And then it's going to assign that value here as this the tip.



204

00:13:38,220 --> 00:13:39,840

So these are steep.



205

00:13:39,900 --> 00:13:42,750

And here we have these TXI the total amount.



206

00:13:42,930 --> 00:13:48,420

And here as you can see for this total we have this takes the total amount that takes currency format



207

00:13:48,450 --> 00:13:50,250

value that format total value.



208

00:13:50,250 --> 00:13:52,900

So he had referred to the name of the value of it.



209

00:13:52,980 --> 00:13:58,750

So now we should actually call this method can actually teep after first we need to call this Meffert



210

00:13:58,770 --> 00:14:01,480

inside this unprogressive change method.



211

00:14:01,770 --> 00:14:08,790

So here I just need to type in calculator tip and we need to also call this method inside this on text



212

00:14:08,820 --> 00:14:09,930

change method.



213

00:14:09,930 --> 00:14:17,000

So here after this try catch block here I can actually call that method track too late.



214

00:14:17,150 --> 00:14:19,720

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