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‫Speaker: Hi. Before we continue to do

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‫reverse engineering curve this application,

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‫I just wanted to explain all of these codes to you.

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‫So if you're not an Android developer,

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‫you get to see what we are doing in this codes.

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‫Of course, in real reverse engineering

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‫or real penetration testing,

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‫you won't get to see the codes

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‫at this context this clearly.

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‫But since this is a test

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‫and since you are learning how to do it,

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‫then I believe it would be a good idea

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‫to learn about all of this stuff before we continue.

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‫So if you are already an Android developer

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‫then you're more than welcome to skip this lecture.

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‫So I'm gonna start with Android manifest.

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‫As you can see, we have this main launcher tag

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‫which indicates the activity

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‫that needs to be shown first when application is launched.

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‫So signup activity is actually the first activity

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‫that we see.

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‫So over here in the signup activity,

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‫we see some methods like on create and the other methods.

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‫There are a couple of edit texts, email texts,

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‫and password texts,

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‫Of course, these are the texts

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‫that we are getting input from,

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‫and we have this fire base authentication object.

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‫So let me go over here to this buttons.

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‫As you can see, we have signing clicked and sign up clicked.

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‫So these are for signing the user up

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‫and registering,

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‫signing and registering and logging in the user.

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‫And we are using this fire base authentication object

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‫in order to create user with email and password.

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‫So this is the power of fire base SD case case.

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‫As you can see, it's very clear.

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‫You all need just type, create user with email and password

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‫and you get the email and password from the email text

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‫and password text as usual.

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‫And if it's a successful operation,

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‫it will give you a call back like this,

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‫you get to do what you want to do.

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‫And over here we do an intent to Feedactivity

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‫once we register the user.

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‫And actually it gets to see the tweets,

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‫previous to it that are held,

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‫that are actually written by other users.

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‫So sign and click does exactly the same thing

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‫only it's just logs the user in

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‫rather than registering the user up.

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‫So over here we still do the same thing

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‫with just having an intent to the feed activity.

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‫And over here you see a coding block,

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‫which starts with controlling the fire based user.

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‫So if the user is already signed in before,

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‫if it's not null,

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‫null means void now means new.

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‫And if it's not null if it's over there,

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‫then we're going to do an intent.

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‫We won't have to show the sign in or sign up activity

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‫to the user at all if they're already logged in before.

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‫So let me go back to your feed activity over here.

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‫As you can see, we have couple of array lists

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‫of strengths and we store the user email

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‫from Firebase and user tweet from Fire Base

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‫in this array list.

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‫And also we have our recycler adapter

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‫which we will talk about later.

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‫We have the menu, options menu functions over here.

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‫So we get to say what happens when we click

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‫each one of these buttons over here.

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‫Okay, and remember we created that menu under resources

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‫under menu folder,

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‫so we actually connect that menu to our activity

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‫using this methods.

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‫So if we click on a tweet,

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‫then we are going to do as if we click on signup,

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‫then we are going to do this.

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‫So if we click on a tweet,

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‫we are going to go for tweet activity

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‫every click on signup,

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‫we are going to go back to signup activity.

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‫Okay? So under onCreate, we don't do much,

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‫we only do the setup thing like getting the data

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‫from the fire store.

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‫So I have written all of this actually codes

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‫under a separate method like this,

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‫since it's a little bit long.

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‫And as you can see, we're getting the collection tweets,

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‫we are reading from collection tweets.

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‫We can have multiple collections over here

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‫like tweets, user, I don't know, address

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‫whatever you can think of.

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‫Since this is a test application,

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‫we only have one collection and we are reading it.

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‫So we are getting the data from tweets

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‫in this coding block in this method,

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‫and we are sorting them by the date.

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‫And over here, we are getting everything and storing them

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‫inside of these two array lists.

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‫Okay? And over here, we are actually using those array lists

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‫in order to create an adapter.

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‫So adapter actually connects this data source

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‫with the recycler view itself.

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‫So if you look at the activity feed XML,

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‫you will only see a recycler view,

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‫you won't see anything else,

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‫because we are going, we are using Recycler Row XML

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‫over her,

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‫and since we are using our tweet recycler adapter,

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‫we can connect our recycler row with the recycler view

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‫and also with the feed activity data.

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‫So that's what Tweet recycler adapter does.

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‫So adapter is very important.

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‫It's holding everything together.

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‫So as you can see, it's using some class

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‫called RecyclerView.Adapter,

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‫it actually has its own class.

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‫And over here we create a constructor

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‫to specify the data that we are going to need.

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‫And over here, we are actually connecting

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‫the recycler row views with like text view or edit texts.

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‫So we have two text views over here,

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‫User tweet text and user email text.

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‫And after that, we are just connecting everything together

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‫under this tweet recycler adapter.

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‫Now, since we are using this tweet recycler adapter,

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‫we are actually able to connect our feed activity data

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‫with the recycler review that we are seeing.

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‫So this may sound a little bit complicated

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‫if you're not an Android developer

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‫but believe me, it's not.

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‫If you learn about Android development it should be

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‫an easy thing to do for you

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‫after actually spending at least a couple of months in it.

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‫And over here in the tweet activity,

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‫you'll see tweet button click,

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‫and of course we are uploading every data

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‫to the fire store in this case.

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‫And then like we store the date,

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‫we store the user email at Tweet itself over here.

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‫And then if it says success, if it's a successful operation,

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‫then we go back to feed activity

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‫to display this data to gather this information

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‫from fire store and display it to the user.

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‫So that's what we are doing in this code.

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‫Of course, you don't need to understand everything

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‫at this point,

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‫but we are going to reverse engineer it in the next lecture,

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‫so maybe it would give you a good idea

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‫about what we are doing.