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Welcome back.

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And this week we are going to sign in the user using email and password and therefore you can go ahead

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and try to do yourself.

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So just follow along the password authentication here in the firebase documentation.

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And you can see that it's, um.

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Yeah, they're using an extra variable here, which is called off in order to have the firebase of system

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once and not having to recreate it every single time you want to do something with it.

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But as we are just using it once when signing in, it's actually find a way we do it, but both ways

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are fine.

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So you can, of course, go ahead and create a late initialized variable called Firebase all or just

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all, and then use that.

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So you need to initialize it.

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At one point, of course, you get the firebase all instant and then you can go ahead and use this code

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here in order to sign in the email with the user, with an email and a password or so.

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Please try to do that, try to implement the Sinon feature in this sign an activity.

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All right, so this time I'm going to just follow along here.

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I'm just going to use the documentation to create this new light and variable and we need to go to our

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sign in activity, so.

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And here, activities and and, uh, sign in activity, then we need to create this plate in a variable

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that we want to initialize later on.

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So we need to import firebase authentication and then so we can either set off in uncreate or we can

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do it at the moment when we actually use the function.

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So either way is fine, I think just doing it here is going to be fine as well.

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So let's just said the get instant's here.

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Why those all get instance, all right, and now we, of course, need to have a function which allows

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us to sign in.

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So how do we want to call it?

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Well, I'm just going to call it sign in.

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Registered user, so private fund sign in registered user, you could, of course, just call it sign

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and user, that would be fine as well.

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So now let's go back and check the code here.

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So it says Volle, current user of current user check if user is signed in.

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So this is how you can check.

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If these are signed, then we will do that later on.

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But what's important is this part here.

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So where we sign in the user with email and password.

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So first of all, of course, we need to have the email and password, so VUL e-mail string that will

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be ETTY email, text to string and then we trem as well.

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So actually it's the same as we had it in the sign up functionality.

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So here we only need email and password.

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So let's just copy those two over to our sign and activity because they are really just the same with

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just trimming an empty space at the end.

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Then we need to validate the form and we're going to validate it in a very similar way as we've done

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here.

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So private fund, validate form.

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Let's just copy that and use it in our sign in activity as well.

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So here I'm just going to create one.

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But the difference is that I'm going to not use the name here.

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So when signing in, we just need to email and password, right.

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So we don't need to have the user name as well.

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And here, of course, we can then get rid of this whole part here.

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And also, we need to make sure that our class is inheriting from base activity because in base activity,

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that's where we set up everything that we can now use for the snack bar.

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So show our snack bar is what we prepared in our base activity and now we can reuse it here.

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So now we have validated for.

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OK, so at this point we can validate the form with the email and password that we have from the user.

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So if email and password are validated, so validate form with email and password, if that is true,

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then we want to sign in the user.

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So invalidate form.

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We just checked if the user has entered anything at all, if it's empty, then we just want to let him

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know, hey, you need to enter something.

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But otherwise we're going to be fine with whatever he has entered and then we can do the authentication.

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Of course, we can also first show the progress dialogue where we just let the user know, hey, please

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wait.

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So actually it's going to be the same as and sign up.

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And it's a little more because we also need to get the resources, get string and so forth, so let's

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do the same thing here and it's almost the same function.

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So the Sinon registered users almost or Disvalue they form, actually, it's almost the same function

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as our sign up, but slightly different still.

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OK, now we need to make sure that email is the right one because it is the one from sign ups.

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So we need to make sure that it's the one from sign in.

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So any email we can see we have to hear.

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So now what we can do is we can rename one of them.

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So let's rename the one from our sign up or actually let's go for the one inside.

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And I think that makes more sense.

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So.

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Here it's on our resources lay out sign in and here to Ed, text's are the ones that we are interested

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in, right?

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So.

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Text fields lay out here, eat email on the score, Sinon, and then.

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ET password on the score, sign it.

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So how I'm going to call them.

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All right.

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Of course, you could use sign on the score in to be more precise, so that.

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It's even happier here, just like that.

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OK, so now inside and we need to make sure that it's E.T. email, sign in and password sign it, OK,

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because otherwise we will use the one from sign up.

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OK, so at this point we can go ahead and run our code.

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So here we can now finally run the code from the website.

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So let's copy this.

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And then added in here.

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OK, so I'll tell you why I'm not going to use that log.

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Well, we can.

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His dad can import it.

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We don't have a tag yet.

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That's also something that we might want to import, so import toast update wise, what we're going

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to use.

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So here they have tag as well.

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So I'm just going to call this tag sign in.

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And here as well, sign an.

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Also, by the way, this vile user of current user.

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Well, that's fine, but we're not using it right now, so we don't need it yet.

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And also here we say authentication failed, but, well, we are providing the exception in the Lochhead,

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so I think that's going to be fine.

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OK, so this is very similar to what we had before in our sign up here.

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Of course, we could also, instead of toasting the whole error message to the user, which he doesn't

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understand probably, or which doesn't make sense to him, we could replace that, of course, with

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also registration failed or something like that.

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So let's just do that real quick here.

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Registration failed.

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All right, so now we can go ahead and test it, so let's see if we can sign in our user.

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Once we click the button, but of course, we still need to fix the error that we have here.

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So as it seems, I'm liking one curly bracket at one point when I copy to validate form, I didn't copy

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it correctly.

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Also, something that we probably should also do is hide our progress dialogue at one point because

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here we show it and if we don't hide it, then it's not going to be very good.

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Look at your app, so let's hide it directly here.

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So once it's completed, so high progress, dialogue and then.

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Let's move over to our main activity, OK, just so that we see that it actually works.

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So start activity, intent from this to the main activity, colon, colon, class, Java.

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And intent needs to be important.

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Let's do that real quick.

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OK, so once we are successfully signed, then we want to move over to our main activity here.

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Now, of course, there's one last thing to do, and that is to add functionality to the button, because

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currently when we sign in, when we click on the sign in button activity, sign in.

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So let's see, we have this button called button sign in.

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If we clicked this one, nothing happened.

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So let's add an unclipped listen to it sign in said on Click Listener.

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And here we will use to sign in registered user function functio.

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So this functionality just prepare.

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All right, and then there's one bug that I found as well when running the application so you can test

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it, run it.

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The thing is, our set up action bar is really just a copy of the setup action bar and the sign up activity.

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And when you do that, you have to be careful.

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And I wasn't careful enough.

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So you can see set up said support action bar for toolbar sign up activity.

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Of course, it should be for our toolbar sign in activity.

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And the same goes down here with the set navigation on Click Listener.

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So if you do these kind of things, copy and pasting, you always need to double check for changes.

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But at the point when you test it, that's latest word, the latest moment when you realize those things.

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So no worries there.

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It's still fine.

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So let's run it again.

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Now, we should hopefully get to design the activity.

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All right, so there we are.

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OK, so this seems to work.

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Let's test Dennis at.

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Gmail dot com password was super secure, sign in, please wait.

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And we are moved over to the hello world screen, which is our main activity, so as it seems, this

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worked.

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So we are now logged in, which is pretty cool.

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So now you can see how you can sign up a user and how you can sign in a user.

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And now we can go ahead and display stuff to the user that is relevant to him.

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So that's, of course, what we have to set up step by step, because there is a lot of functionality

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that will follow and we haven't even touched the database yet.

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So that's super interesting stuff that we're going to look at later on.

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So in the next video, first of all, we are going to create a new entry in the database.

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So we're going to create a new database itself.

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Right.

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So using the firestorm and the next video and then we're going to use the user class.

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So we're going to create a new model and so forth.

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So let's go ahead and check that out.

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See you in the next one.

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And by the way, I hope you were successful in writing this code and you fixed the box that we have

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here and everything, because at that point, I would expect you to be able to do that.

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So if you weren't able to do that, then try to do and we'll create another app where you do the sign

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in and sign up functionality from scratch all by yourself using the documentation only because this

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is going to be super relevant and important when it comes to developing applications for customers in

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the future or even for your own ideas that you have.

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Because running into errors is normal.

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It's no problem.

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Running to bugs is also normal.

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It's important to fix them.

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It's important to check out documentations, to read through the Internet, to find solutions and so

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forth.

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All right.

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See you in the next one.