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Hire everyone in this tutorial I want to show you how you can download and upload files to firebase.



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So let's create a new Android studio project here.



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So the application name is going to be upload and download files.



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So here you can specify the company domain the partitioning and the project location.



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So just going to connect here choose API 16 Android 4.1 jelly bean as the minimum SDK for phone and



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tablet on next and here choose empty activity next.



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And here don't change anything.



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Just click on finish.



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So now that a project is created let's actually connect this project to the Firebrace.



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So at the top menu.



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Just click on Tools and here click on Firebrace.



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Let's wait a little bit here.



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And now you can see that this assistent area is opened.



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Click on storage and here click and upload and download a file with firebase storage.



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So here first we need to connect to firebase.



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Here you can see that these starts connect dialog opens.



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So let's wait a little bit here and here it says create new firebase project.



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So this is the name of the project.



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And here you can specify the country region and click on Connect to firebase.



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So now that the app is connected to firebase now it's time to add firebase storage to our application.



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So just click on the spot in here at firebase threshed your app.



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And here you can see these changes that will actually take place inside our project.



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So just click and accept changes.



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So let's wait a little bit here.



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Here you can see it's cradle and it's actually doing something some processes are happening here.



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So let's wait a little bit here.



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So now it says dependences set up correctly.



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So let's collapse this assistent area by just clicking on the spot in here.



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So this is our project.



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Now let's go to our activity Underland minute exam segment here.



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And let's actually double click on the stop here in order to make this area of Vider selectees hello



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world takes you here and and pre-press on Dorothy on your keyboard.



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So here first of all we want to allow the user to upload an image to the actually Firebrace storage.



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So here inside this pallet section just click on images here and you can see this image button image



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view video view.



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So for now we just we don't want to actually work with these objects.



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Let's click on all and let's click on this button here select the spot and just track it here into this



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constraint to lay out.



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Notice that this is a constraint and not a relative or a linearly out.



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So just put the button here.



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I select spot button let's add the constraint to the top of this view.



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So you can see this little circle here on the top edge of this button that is pulsating.



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So let's create a constraint to the top of the view here.



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So now here inside this property section you can see these constraints.



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So for the top constraint Let's actually change this value to number 18 and let's select this button



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here.



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So for the ticks Let's actually just open here upload upload the image to firebase Firebrace and in



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person until you are on your keyboard.



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Let's give an idea to the Spartans select disputant.



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So for the ideas they've been here PTEN upload image and that person entered January keyboard.



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So now let's open our browser here now here inside the search.



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Put up your web browser search for Picasso Android.



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So we need to add this library to our project.



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So here we can see this first link that appears here.



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Picasso that square.



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Open Source.



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Let's click on it.



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Let's wait a little bit here.



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So now let's scroll down here.



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So let's actually take a look at this introduction it says images add a much needed context and visual



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flair to Android applications.



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Picasa allows for hassle free image loading in your application.



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Often in one line of code many common pitfalls of image loading up on Android are handled automatically



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by Picasso handling image recycling and download cancellation in an adapter.



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Complex image transformations with minimal memory use automatic memory and disk caching.



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So let's scroll down here so let's see actually how we can add this library to our project solaces call



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that.



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And inside the download section.



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Here we have the jar file and we have this cradle quote here.



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So we need to add this code to our project just copy this line of code here.



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Let's go back to android studio and let's actually open the Android view here.



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So here you can see these great scripts open this may be that great fight the module app double click



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on it and scroll down.



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Here you can see this dependences block here right inside this dependences plug paste.



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This line of code here that we actually copied from the Picasso website here and now you can see it



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is now a button here that appears here is just click on it in order to see the project.



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So let's wait and now we can see that the Picasso library is actually being added to our application.



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But if you encounter any problems here at this point of your application make sure that you have updated



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the Android repository packages of your Android SDK.



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Make sure that you have updated to build tools and redeposited packages and Google Play services.



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So we always make sure that you have updated all your packages that you have inside you as well that's



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the case so in order to show you how we can update those packages.



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If you have a Mac you just need to click on Android studio and then click on preferences.



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If you have Windows you just need to click on file settings.



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So I just need to click on preferences here.



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Now here you can see inside is an appearance and behavior we have the system settings and we have this



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Android SDK so you can see these actually.



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These a hundred years ago for example there is an update for that.



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And right now I get 7.1 point one 1 also.



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The Android 8.0 is released but I don't recommend to actually just use it because at this point it may



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be a little buggy so let's all wait until a more stable version of Android 8 is released and then use



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it.



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So for now we're going to use this version and we're seven hundred seven point 1.1 or Android 7.0 or



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Android six point zero.



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If you want to see the package details you can't just click on this package details here.



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So now let's click on SDK tools now.



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Make sure that you have installed and updated.



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Andrew is the cable tools Android emulator and with STK platform tools Android our support library here



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as you can see I have updated the Android support library to the latest version and this one Google



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GGP with the blogging tools Google Play.



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AP AP extension library Google Play licensing library Google Play services Google Google driver and



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make sure that you actually have updated all these packages here and with support repository.



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These ones.



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So just click on OK now let's go back to Underwoods studio.



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And here let's go to our main activity class.



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So let me clean this up here in order to make this area wider.



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So first of all let's just for example let's just declare a bottom here so just type in here private



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BOTTEN PTEN upload image BT and upload image and then put a semicolon here.



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Let's go to this uncreate Smurfette.



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And here's just typing PTEN upload image assignment operator.



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Let's cast this object to our pattern of text find view by id artist Id that PTEN upload image semicolon.



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So now let's create a listener for this spot and let's make a spot and a listener to the changes that



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is being occurred on the spot and so here I can see Betty and upload image that sets unclick listener.



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Now you just hold the shift key on your keyboard and then presently they reach you on your keyboard



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so that this option appears uncle at the center and you can see the curly braces and these free dots.



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So just select this one and then press and and to your keyboard so the Android studio automatically



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put these codes here for you so that this button is now a listener to the clicks or the touch of the



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user.



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So let's go inside is unclear method here.



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Let's create a comment here.



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So just step in here.



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Upload the image to the server to this server.



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Right.



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So now let's actually create some references to the firebase instead.



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So inside this main activity class let's create a variable of type Firebrace storage such as step in



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here private Firebrace storage Firebrace storage and the name of this variable is Firebrace storage



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semicolon.



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Notice that you are not initializing these valuable here.



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Right.



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We are just declaring displayable here private and here let's create a variable of type storage reference



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so that this variable is going to hold a reference to this for instance.



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So so this reference and the name of this value bit is sort of a reference semicolon.



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So let me first show you the web browser.



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So here enter this you Arel firebase that Google that makes sure that you are assigning to your firebase



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account.



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And here click on go to console.



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So here you can see the firebase protects here right.



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So now let's click on our own project upload and download files so you can see that there is a typo



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here.



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So I forgot to put the P letter here.



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So let's click on our project here.



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Now you can see that this is our project right let's click on storage and here you can see these two



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taps files and rules.



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Right.



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Let's click on rules.



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So here we need to change the rule we need to say that allow read write if requested oath is equal to



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null so that anyone can actually upload files to are actually storage here.



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It's not really recommended to actually to change the sitting here.



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It's not the command to say that everybody can upload files to our backend but for this application



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it is OK but later you may want your users to be authenticated inside your application and only the



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authenticated users can upload files to the backend.



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So let's get we can publish now we can see it's as rules published.



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Let's go back to the files tab.



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So here you can see this you are right.



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Look at look at this you are all here.



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This is the you are ill that we can use to upload what we can actually.



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We can also manually upload it to our patch and if I click on upload fight here.



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So now for example I can select one of these images here for example Fox that is open right now it's



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going to upload this image to our backend and later and we can download this image from our patch.



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So for now we just want to learn how to upload files using Java codes in Android to Firefox.



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So let's go back to android studio.



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And here let's initialize our Firebrace storage instance.



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So let's go inside these uncreate Smurfit here after this line of code that actually initializers this



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PTEN upload image.



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I can refer to this firebase storage here.



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Assignment operator and here I can say Firebrace storage that gets instance semi-colon.



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Right.



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So now it's time to initialize our storage reference.



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So just typing here storage to our friends storage reference assignment operator and refers to this



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firebase smallest instance does get a reference from you or l.



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So let's let me show you the web browser here.



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So you can see this you are in here right.



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If you click on this I can hear it says copy for you.



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And let's click on it and it says copy to clipboard.



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Let's go back to our Android studio and let's put two quotes here and paste this you are in here right



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semicolon.



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



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So it's time to go inside.



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It's unclear to me if of this Pythian upload image that's the thanklessly center here.



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Now first we need to create an intent.



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So just they've been here intent and the name of this internet is going to be image intent image intent



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assignment operator new new intent and here inside the apprentice's.



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I can't say intent that action Pietsch intent that action.



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And then put a semicolon at the end of this line of code here.



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So here just type in image intent data sets type and put two codes here and just type in here image



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slash and at the end of this line of code just put a semicolon here.



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So here we are specifying the type of the intent.



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So we are going to access the images.



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So the type is going to be Image slash.



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And then here we need to call this method start activity for result.



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First we need to pass the intense image intent comma.



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So here we can specify the request code.



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So for this specific application I'm going to pass that number one here if you want to we can create



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a constant that holds this value number one and then each and past is constant here.



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But for this application I just pass that value and number one here.



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Let's scroll down here.



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And before the end in curly brace of these main activity class.



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So here we need to override the unactivated result method on activity result.



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So this method is going to be executed when the user has selected an image from the gallery or anywhere



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else and they use it is actually come back to the main activity.



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Now the NITV to resolve if it is called.



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So that's why here inside these Uncle Mefford we said start activity for results because we want to



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get a result from that specific activity this image into it actually.



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So inside this activity result I can create an if statement or I can actually create a switch statement



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or switch switch request code.



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Right and then open and close this switch statement by using the curly braces here.



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So here we passed number one as the request to the Smif at right.



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So here I can say.



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Case number one colon.



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So he had notice that we are referring to this request called argument of this unactivated is augmented.



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Right.



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Case Number one if there is that request code is actually number one.



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I can create an if statement here so if result call it now I'm going to refer to this result called



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arguments so if resolved code is equal to the result.



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OK.



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So now open and close this if statement by using these curly braces here.



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So not just after this.



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Notice that after this case statement make sure to actually put this break statement here.



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Right.



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So now inside these if statement we can't say so or not is that the Smurfit has this argument of type



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intent and it is data.



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Right.



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So we get that data from the image intent.



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So first we need to access the user of that specific image that is selected by the user.



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So we can create a value of that you are here.



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So you are right you are right.



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And the name of this valuable is image.



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You are the image you are the assignment operator.



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Now refer to these arguments name data that get data.



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So notice that this that gets the time if it actually returns a value of type you are.



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I soon notice that these data type here determines or specifies the return type of the Smurfette which



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is going to be you are right.



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So just select the Smurfette and then press on and end up with a semicolon at the end of this line of



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code here.



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So now that we have this image you are right you can say.



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So let's create a variable of types thought its reference in order to hold the reference of the images



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that you're going to have inside our backend.



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So solicitor or offense and the name of this variable is going to be Image address image address in



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Firebrace assignment operator.



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So now let's refer to our store as reference variable that we created above inside this class.



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So just typing here.



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00:16:18,480 --> 00:16:20,820

So our friends thought so.



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Because I want to actually create a folder inside our backend.



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I'm going to create a chart.



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So you're already familiar with these concepts because they are in their fiber section of course.



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I talked a lot about how we can create a child how we can create a folder and how you can put your actually



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files or data inside those forth.



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So I'm going to create the child the name of this child is going to be images.



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Right.



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So now I want to put this image that the user has selected two into these images folder so I can say



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again that child.



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And now I'm going to refer to this image you are right so you can say image you or I did not get last



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paff segment so this is going to be an address of that specific image that the user has selected.



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If you want to you can create unique image names you know how to do that in the previous two tutorials.



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I thought how you can create unique names so that you can actually use them inside your applications.



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But for now I just want to use that last puff segment semi-colon.



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So now let's create a new line here.



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Let's create on line here and now after this line of code.



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So in order to see that whether the image is actually uploaded to Firebrace or not.



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We need to actually create an on a successor listener for these addressee or for this sort of reference



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image address in firebase.



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But before that we need to put the image into this address so we can say image address in firebase that



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put file.



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So not that this if it needs an argument of type you or I.



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So we have this you are right.



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Image You are right.



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And here I can say that at on success.



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Listener and just they've been here new and hold the shift key on your keyboard.



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And the person then they're all on your keyboard and it says unsuccessfully send right.



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Select this one and then put us on it which I knew.



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So now the Android studio puts these lines of code here automatically for you.



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So let me create a new line you know so that you can see the entire codes that are generated here.



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Right.



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These are the codes that are generated here.



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E-mail address in firebase that putrified image you are right that ad unsuccessfully Center new unsuccess



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listener upload task or task snapshots.



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So the task snapshot is going to have the you are right that we need in order to actually download the



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image later we are not going to use it now but we're going to actually use it later when we want to



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download the image and put it into our image.



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So this is the unsuccess method right.



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The unsuccess method is going to be called then the uploading task is actually successful.



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And when the image is successfully uploaded to their firebase.



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But what happens if the image is not actually successfully uploaded to the firebase.



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In that case we have actually an on failure it.



285

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So let's put this in parenthesis here.



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There is an error here it says put a semicolon here.



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So don't put a semicolon here just put that here and select this one add on failure center and then



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press and attention your keyboard and inside the apprentice's just open here.



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00:19:28,730 --> 00:19:33,830

You again hold the shift key on your keyboard and then press on the letter or key on your keyboard and



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00:19:33,830 --> 00:19:39,760

select this one on phileo listener and then present it to you on your keyboard so you can see that we



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00:19:39,770 --> 00:19:41,100

have this unfairly on my face.



292

00:19:41,120 --> 00:19:48,130

So this is going to be executed when the uploading task was not successful and it actually failed.



293

00:19:48,140 --> 00:19:51,620

So let's actually put a semicolon here at the end of this Prentice's here.



294

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So now we have no errors right.



295

00:19:53,690 --> 00:19:56,000

So let's go inside is unsuccess Smurfette.



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Let's create a toast message toast that make takes the first minute to pass the context.



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00:20:01,880 --> 00:20:08,380

Don't just talk to typing this year because if you put this year here we actually created an anonymous



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00:20:08,390 --> 00:20:13,750

in a class that actually implements this unsuccessfully center interface.



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So this here refers to that anonymous class not this main activity context so the context is actually



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the main activity.



301

00:20:21,890 --> 00:20:28,170

So just typing here main activity that this has the context come up put two quotes here.



302

00:20:28,280 --> 00:20:30,150

So now we need to put the message here right.



303

00:20:30,170 --> 00:20:37,570

And here I can say uploading was successful Let's put an exclamation mark here come up.



304

00:20:37,650 --> 00:20:44,300

And here we just need to specify the duration of the message so they can hear and launch that show.



305

00:20:44,460 --> 00:20:44,860

Right.



306

00:20:44,940 --> 00:20:49,850

Let's copy this line of code and let's put it here inside this unfairly and method too.



307

00:20:50,220 --> 00:20:59,040

And this time we can say uploading was not successful uploading was not successful and that's it.



308

00:20:59,040 --> 00:21:02,090

So now it's time to run the application.



309

00:21:02,100 --> 00:21:04,880

So let's run the application and let's see what happens now.



310

00:21:04,950 --> 00:21:07,950

So just select one of these devices and then click on OK.



311

00:21:08,130 --> 00:21:13,740

So now you can see that I opened the other browser here and I want to show you the emulator here.



312

00:21:13,740 --> 00:21:16,710

So let's click on this button upload the image to Firebrace.



313

00:21:16,710 --> 00:21:22,290

So it's going to actually open the gallery for us so I have actually taken these images if you want



314

00:21:22,290 --> 00:21:22,690

to.



315

00:21:22,740 --> 00:21:29,130

You can actually to use the camera of the emulator here and then you can actually just take some pictures



316

00:21:29,130 --> 00:21:29,860

here.



317

00:21:30,210 --> 00:21:32,780

Let's go back to our app here.



318

00:21:33,120 --> 00:21:34,990

Upload and download files.



319

00:21:35,040 --> 00:21:41,170

So select one of these images and now you can see that our application crashed.



320

00:21:41,220 --> 00:21:42,240

There is a problem here.



321

00:21:42,240 --> 00:21:45,270

Let's go back to android studio now.



322

00:21:45,570 --> 00:21:47,220

If you want to find the error.



323

00:21:47,250 --> 00:21:49,140

I just need to click on this android monitor.



324

00:21:49,140 --> 00:21:53,420

So let me show you the error here and here look at these lines of code here.



325

00:21:53,430 --> 00:21:55,630

These these are the texts actually.



326

00:21:55,860 --> 00:22:01,690

And it says Jobar that line that security except exception permission denied.



327

00:22:01,980 --> 00:22:04,370

So there is a permission error here.



328

00:22:04,660 --> 00:22:10,410

And if I show you it says that we need to have read external storage permission this is actually a dangerous



329

00:22:10,410 --> 00:22:14,280

permission and we need to actually declare this permission.



330

00:22:14,280 --> 00:22:18,100

In both of our files the manifest file and the job of life.



331

00:22:18,270 --> 00:22:23,120

So let's go to our Android studio and here let's open the ad with you.



332

00:22:23,120 --> 00:22:25,080

Let's just double click on this manifests here.



333

00:22:25,260 --> 00:22:28,740

So let me stop here in order to make this area right there.



334

00:22:28,740 --> 00:22:32,490

So let me just put the spin machine here inside this manifest.



335

00:22:32,630 --> 00:22:37,280

So just open it up and just type in here use this permission and just type in here right.



336

00:22:37,290 --> 00:22:39,210

External storage right.



337

00:22:39,270 --> 00:22:45,180

External storage and just disclosed is that if you choose a right external storage your application



338

00:22:45,180 --> 00:22:49,080

is going to have also permission to read the external storage.



339

00:22:49,080 --> 00:22:55,320

Your application is going to have to the permission to read and write the external storage.



340

00:22:55,320 --> 00:23:00,410

So let's go to automate an activity class let's scroll to the top here and now here.



341

00:23:00,420 --> 00:23:06,680

After declaring Desplat in here we need to actually say that you're going to have our permission.



342

00:23:06,730 --> 00:23:11,460

We are going to ask the user to give us the permission to access their external storage.



343

00:23:11,610 --> 00:23:13,390

So just create a variable of type integer.



344

00:23:13,390 --> 00:23:15,030

Here inside is uncreate Mefford.



345

00:23:15,330 --> 00:23:19,280

And then the name of this variable is going to be permission result.



346

00:23:19,530 --> 00:23:25,400

Assignment operator and just type in here context compact that chick's self permission.



347

00:23:25,650 --> 00:23:31,710

So for the first argument we need to pass the context so the context is main activity that this come



348

00:23:31,710 --> 00:23:32,200

on.



349

00:23:32,460 --> 00:23:38,040

And the second argument is going to be just type in here manifest.



350

00:23:38,340 --> 00:23:41,320

So choose this one here and manifest Prentice's Android.



351

00:23:41,430 --> 00:23:41,880

OK.



352

00:23:41,970 --> 00:23:44,900

That permission that's right.



353

00:23:44,910 --> 00:23:47,430

External sort of streite external storage.



354

00:23:47,430 --> 00:23:49,990

So this is our permission write permission resolved.



355

00:23:50,190 --> 00:23:52,130

So let me create a new line here.



356

00:23:52,140 --> 00:23:59,160

So now that we have this permission result let's actually create an if statement so if permission result



357

00:23:59,700 --> 00:24:03,680

is equal to package manager that permission granted.



358

00:24:03,930 --> 00:24:09,540

This means that if the user has actually given us the permission to access the external storage then



359

00:24:10,020 --> 00:24:14,790

we can actually put some lines of code here but we can actually we need to create an else statement



360

00:24:14,820 --> 00:24:21,990

here in case the user doesn't give us actually permission to access that external storage.



361

00:24:21,990 --> 00:24:24,030

So in that case we can actually say.