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‫Instructor: Hi! Within this lecture,

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‫I'm going to take you over our game app code.

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‫So if you are new to Java and under a development

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‫this lecture may be good for you

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‫to understand what's going on,

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‫on the background of these kind of games.

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‫And if you are already experienced,

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‫I suggest you skip this lecture and don't look at the code

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‫so that it will be much more realistic for you

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‫to reverse engineer it first

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‫before seeing the codes themselves.

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‫Okay?

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‫So here you go, here is our game manifest,

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‫our main manifest, and as you can see,

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‫there is not much to see over there.

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‫Let's just jump into our codes.

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‫So we see the game activity and in the manifest

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‫it was listed as the launcher activity,

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‫which is the first activity.

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‫In fact, we only have this activity in our game. Okay?

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‫And as you can see, there are some texts,

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‫like input text, core text, category text,

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‫so let me go to our XML.

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‫So let me make this a little bit smaller

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‫so that we can have a space.

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‫If you come over here, you will see there is an input text,

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‫there are two buttons, one for category,

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‫and one for sending the guess. Okay?

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‫And as you can see, there are some unclick methods

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‫assigned to those buttons like, sendButtonClicked.

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‫And for this changeCategoryClicked,

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‫we will see the related methods in the JAVA section.

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‫So over here we have the score text,

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‫where we display the score itself.

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‫So if you come over here you will see all the defined texts,

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‫and also you will see the related methods, as well.

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‫So after defining the texts,

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‫I am creating something called score,

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‫and actually I defined it as a global variable,

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‫and I'm initializing it to be zero,

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‫when on create is called.

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‫So score starts at zero, as expected. Okay?

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‫And I also have a variable called categoryCounter,

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‫which is already zero at this moment.

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‫And then we're creating come models, called WordModel,

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‫and here you can see the WordModel on JAVA itself.

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‫So if you come over here, you will see that it's a class,

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‫and it already has some attributes and constructors.

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‫As you can see we have this category name,

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‫which is a string,

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‫and gameWords, this is an array list of strings. Okay?

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‫So we're going to have a look at this gameWords

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‫later on in here.

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‫So if you come over here, there's a ModelPopulator class,

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‫which actually populates the model,

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‫like, creates the array list of keywords

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‫like banana, apple, watermelon, melon, grapes,

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‫so you can actually see the keywords

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‫in this ModelPopulator over here.

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‫Of course, we are doing this only for practice.

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‫In real life, you won't get these key words easily.

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‫I'm just trying to make you familiarize with the codes

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‫of this application,

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‫then we will go onto the reverse engineering, okay?

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‫So if you come over...

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‫Come back to gameActivity,

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‫you can see we created three models

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‫for fruitModel, bandModel, and dogModel.

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‫So we have three categories, as you can see,

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‫one for fruit, and bands, and one for dogs, as well.

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‫And we add all these models

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‫to our array list containing categories,

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‫like containing actually, wordModels.

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‫So the category's array list, if you come over here,

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‫you will see that it contains wordModels.

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‫So wordModel objects that we have just created

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‫go into that category array

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‫and we call something called categoryRefresher.

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‫If you come over here, to categoryRefresher,

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‫you can see there is a current category,

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‫which was set to be zero initially,

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‫and it defines the category text.

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‫We haven't talked about this,

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‫Here is our category text right now,

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‫and this is how we set the category text.

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‫We get it from the array list

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‫and we get the category name afterwards,

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‫and we use this check key word, check guess,

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‫maybe if you want to call it that way.

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‫When we click on sendButton,

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‫and as you can see,

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‫checkWord returns 1 if the current category

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‫contains user input, okay?

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‫If it contains this user input then we return 1 in checkWord

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‫and if it doesn't contain, we return zero.

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‫And it takes that returning integer

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‫from that checkWord method and adds it to score

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‫and then it sets the score with the current score number.

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‫So this is a very simple game, of course,

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‫there can be a lot of improvements regarding to this game

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‫but it works right now and it is suitable for us

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‫to test our reverse engineering skills.

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‫And we have changeCategory clicked over here finally,

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‫where we increase categoryCounter by 1

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‫every time I hit the changeCategory button

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‫and it increases by 1 and we get the current number

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‫with CategoryCounter integer.

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‫So we have three JAVA files over here

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‫and of course, I made the obfuscation enabled,

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‫I made the proguard usage enabled.

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‫So we won't be able to see those codes clearly

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‫or here we will see them obfuscated,

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‫we will see them encoded and we are going to

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‫try and understand what's going on in this app

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‫by looking at those codes.

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‫See you in next lecture.