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♪ (upbeat electronic music) ♪
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Okay, now you have seen
what exactly is Android.
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So, now it's time to create
your very first app in Android.
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In this particular slide,
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we are going to cover
about Android Studio,
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create our very first
"Hello World" app,
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and we're going to understand
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the basic app development
workflow in Android Studio.
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And then, run our app
in a virtual device,
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and even in a physical device.
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The prerequisites for
Android application development
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will be Java
programming language,
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and you need to have a good idea
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about object-oriented
programming, and XML--
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how exactly you put properties
and attributes in XMLs.
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And you need to have
a good idea of IDE,
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a prior IDE,
it doesn't really matter,
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an IDE which you
have used in the past.
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And we will see how exactly
we work around
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with our Android Studio.
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So your Android Studio
will look like this,
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and it will contain many tools,
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like de-buggers, logcat,
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monitors, emulators.
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So we're going to look
at each one of them
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in coming slides.
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First of all, we need to learn
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how exactly we can install
Android Studio in our machines.
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So, first we need
to download JDK.
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So, we'll go to our browser,
and type "download JDK."
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Download the latest one, JDK 8.
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This will take you
to the Oracle website.
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Accept the license agreement,
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and download it
for whatever the machine
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you are working with.
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For me, it's Mac,
so I will download that.
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Once your JDK is downloaded,
install your JDK.
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Install your JDK.
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And, Continue, Install
(typing)
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The steps in Windows
will be pretty much the same.
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(installer chimes)
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Once the JDK is installed,
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now, next you can go through
downloading your Android Studio.
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Just type
"download Android Studio".
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And, just click on the link.
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It will take you
to the developer website,
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and from here, you can
download Android Studio.
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It will identify automatically
in which machine you are working,
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and it will give you--
if you are working with Mac,
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it will give you Android Studio,
Mac version.
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If you are working with Windows,
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it will give you Android Studio
with Windows version.
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Or, the same goes with Linux.
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So, download the Android Studio,
accept the license and download.
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Once your Android Studio
is downloaded,
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you can start installing
your Android Studio.
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In Mac, you can just drag
and drop in Applications folder.
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In Windows, you will just
double-click your Android Studio
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and it will get you to Windows,
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and from there you just have
to follow the instructions,
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and that's next-- and install.
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And then, you can go here,
you'll see Android Studio here.
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Press on Android Studio--
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click on Android Studio
and Open.
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Now, for the very first time,
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It will ask you for
installation of SDK.
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By default, it always installs
the latest SDK.
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Where exactly you want
to install your SDK,
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so this will be the path.
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You just click
on Next, and Finish.
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So, once the latest component
has been downloaded,
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press Finish,
and you will get to this screen.
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Now, from here on,
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before right away getting
into creating a new project,
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you'll click on Configure,
and click on SDK Manager.
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What exactly we are doing here is
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we are installing further SDK's,
which we will be needing
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while we are developing
our Android applications.
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Either you can install
SDK's from here,
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just click on Android 7.1,
or whichever version you want.
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Just click on that and press OK.
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Or, you can always go
on Launch Standalone SDK.
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Launch Standalone SDK
will give you more freedom
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to install your Android versions.
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For example, in your
Android 7.1.1, API 25,
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you don't really need
a system image of Android TV,
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because we are
not going to design--
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or, this development is not
going to be for your Android TV.
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We might need Google API
Intel x86 Adam 64 System Image.
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If I am using 64,
so I don't need x86.
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So, you see, you can select
whatever you want to download,
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and whatever you
don't want to download.
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So, this is for your latest.
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If you want to work
with other versions also,
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you just have to go
inside those versions.
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You just have
to click those versions,
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and select whatever you want
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to download
inside those versions.
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Like in Android 6.0,
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you definitely want
SDK Platform.
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You don't want TV.
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You don't want Wear
system images installed.
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You don't want Android Wear
system images also.
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Then, you don't want ARM
system images also.
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Now, ARM is again
a system image,
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or it gives you an emulator
which can run your application,
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but ARM machines are slower.
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So, that's why
we need Intel machines,
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which are pretty faster
as compared to ARM.
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Now, in that context also,
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I could have chosen
Intel, normal machine.
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But, I will be choosing
Google API's Intel machine here,
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maybe 64-bit, or 32-bit,
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according to your
system configuration.
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Why Google API's Intel machine?
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Because it gives you
all the features
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which you have
in your normal Intel machine,
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plus it always provides you
with more freedom
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to use your Google API's also.
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So, if you are using a
Google API Intel machine,
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then you might have to download
Google API's also.
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And then, you definitely need
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the source code
for your Android SDK.
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Now, this is for one
of the stable versions
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in the higher one, but if you want
a minimum version also,
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like we'll be working with
one of the minimum versions,
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with API 15,
you are free to select
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whichever version you want
as your minimum version.
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You can go ahead and install
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stuff from that
particular version also.
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Like we need SDK platform, we are
not going to work with ARM.
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And here, also,
we'll be working with
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Google API Intel x86 machine,
and Google APIs,
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and source code for SDK.
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Like I said before, you can
download ARM and other machines,
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but it's of no use,
because we won't be using them.
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We want our application
to be running
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in a pretty faster manner,
so for that purpose
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we need Intel machines
with the Google API's in them.
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After that, just
go to the bottom,
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just come to the Extras section.
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In that Extras section, you will
require Google Play services
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if you want to use
any Google API's,
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like Maps, or the billing system
of Google API.
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And then, for Windows,
you might require
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Intel x86 Emulator Accelerator
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to run your Intel machine
in your Windows phone.
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And then, you can just click
on Install Packages,
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accept the license.
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Accept the license
for other options also,
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and click on Install.
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And this will start installing
your other Android SDK.
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So now, you have seen how
to install the Android Studio.
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So let's just learn
how to create
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your very first application,
"Hello, World" application.
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This will be the very first
screen you will be seeing,
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and you can create a new project
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by clicking on the
very first option,
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Start A New Android Project.
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Or, you can always
create a new project
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from inside the Android Studio.
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You will get transferred
to this screen,
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and this is where you put
the name of your application,
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what you want
to name your application,
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and the project location,
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where exactly you want
your application to be saved.
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After that, you
will get transferred
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to the different templates.
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>From all those different
templates,
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we will select Empty Template,
as we want to start
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from the very scratch.
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Next, we will give the name
to our activity.
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Like I said before,
activity is a screen,
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and we want to create
our very first screen
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for the application.
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And activity is
not just a Java code,
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it contains the UI part also.
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So it will have a Java file,
plus a XML file also,
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which will contain its UI part.
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So we will name Java file
as MainActivity,
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and XML file as
activity_main.
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This is how your
Android Studio will appear
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at the very starting.
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As you can see, on your left
is your Project Files.
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>From this pane, you can
navigate through your project,
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or you can click
on any one of these files,
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and you can open those files.
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In the middle, you have
Layout Editor or Code Area,
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where you can either create
your layout, UIs, drag and drop,
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or, you will be writing
your code in this middle area.
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At the bottom is
known as Console Area,
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where you will see
the status reports,
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or logcats, log messages
of your application,
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or the application
you are creating.
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When we talk about
project folders,
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there will be four folders.
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First will be manifest folder,
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which will contain
a manifest file,
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which will give you
the information
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about the application itself.
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Next will be java, which will
contain all your Java code.
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Next will be res, which will
contain all your resources.
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It can be a layout,
it can be a string,
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it can be images,
it can be audio files.
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So all those resources will be
kept inside your res folder.
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Last will be build.gradle files.
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So, build.gradle files will
give you the information
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about building your
project and app and module.
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We will see about this
in further slides.
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So, let me talk about Gradle.
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Gradle is a building tool
used by your Android Studio.
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And there are basically
three types of Gradle files:
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first, project-level
Gradle files,
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module-level Gradle files,
and settings Gradle files.
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What, exactly, a project-level
Gradle file contains?
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A project-level Gradle file
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will contain the information
about Gradle itself.
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What is the version
of Gradle you are using,
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and what kind of
repositories you are using
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inside your application.
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So, there will be one project
Gradle file per application.
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Next will be module Gradle file.
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Now, there can be one
module Gradle file,
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or more than one
module Gradle file.
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It depends upon the
number of modules
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you are making
for your application.
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Now, if you are creating an app,
let's say a weather application
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for mobile also, for Wear also,
and for TV also,
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now there will be three
module Gradle files,
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giving the information
about each module.
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Each module Gradle file
gives you the information
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about each module,
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like in which version you are
creating that particular module,
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what is the minimum version,
what is the maximum version,
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what is the application IDE,
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or what are all the
dependencies,
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so that will give you
the information
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about the module-level
Gradle file.
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Last is known
as settings Gradle file.
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Settings Gradle file
gives you the information
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about which module you want
to include for your compilation.
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So, if you just want to
compile your mobile module,
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then you will just include
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the mobile module
inside the Gradle file.
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If you want to compile
mobile plus TV,
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then you will include
mobile module plus TV module.
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For more information,
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you can follow the link
about the Gradle.
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Now, once you have
followed all these steps,
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there will be a default
app for you, "Hello World".
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So, how do you run
that application?
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There is a Run button
at the top,
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you click on that Run button,
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and it will ask you for
a virtual device.
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So, you can always
create a virtual device.
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There will be a button,
Create New Virtual Device,
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00:13:40,587 --> 00:13:44,647
or you can go to your
Android AVD Manager,
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that is, Android
Virtual Device Manager.
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00:13:47,867 --> 00:13:50,537
>From there, you can
choose the hardware--
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which hardware you want to use,
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and for which resolution
you want to create an emulator,
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either Nexus 4 or Nexus 5.
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00:13:58,657 --> 00:14:02,617
And then, click on one of the
hardware resolutions.
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Click on Next, and then
you can choose which version
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you want to install
in that particular hardware,
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Android 7.0 and Android 6.0.
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Now, please be apprised that
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whichever SDK you downloaded
at the time of installation,
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only those system images
will come here.
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So, whichever system images
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00:14:24,131 --> 00:14:26,601
you downloaded
at the time of SDK installation,
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only those system images
will come inside this,
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and you can use one of those
system images here.
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00:14:31,691 --> 00:14:35,311
And then, you can give the name
to your Android Virtual Device,
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and then click Finish.
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And it will give you your
Android emulator,
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and this is how your
Android emulator looks like.
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00:14:44,239 --> 00:14:48,009
You can always make your real
device also as a testing device.
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For that to happen, you have
to make your real device
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00:14:51,809 --> 00:14:55,699
a developer device,
or you have to turn on your device
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in developer mode.
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How do you do that?
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Go to Settings,
click on About Phone,
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00:15:01,589 --> 00:15:03,819
and inside there will be
build number.
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00:15:03,819 --> 00:15:06,499
Now, tap into the build number
seven times.
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Yeah, seven times.
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00:15:08,149 --> 00:15:11,429
And then you will see that
the developer option,
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00:15:11,429 --> 00:15:14,109
which was hidden before
into the settings,
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00:15:14,109 --> 00:15:16,009
is available now.
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00:15:16,009 --> 00:15:18,709
Now, go inside
the developer option,
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00:15:18,709 --> 00:15:21,289
and turn on your
USB Debugging mode.
292
00:15:21,289 --> 00:15:25,289
And there you go-- your device
is now a developer device.
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00:15:25,289 --> 00:15:28,249
Now, this is the first part.
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00:15:28,249 --> 00:15:31,069
If you are using Mac,
this is all you have to do.
295
00:15:31,069 --> 00:15:33,699
Now you have to connect
your USB cable to your machine,
296
00:15:33,699 --> 00:15:36,459
and you will be able
to run your applications.
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00:15:36,459 --> 00:15:38,899
But if you are not using Mac,
298
00:15:38,899 --> 00:15:42,389
if you are using Windows
or Linux machines,
299
00:15:42,389 --> 00:15:44,319
then you might have to download
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00:15:44,319 --> 00:15:47,049
USB drivers for
that particular device also,
301
00:15:47,049 --> 00:15:49,049
and install that
in your machine.
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00:15:49,049 --> 00:15:51,049
And after that, you connect
to the USB cables,
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00:15:51,049 --> 00:15:53,189
and you will be able
to run your application
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00:15:53,189 --> 00:15:54,999
in your real device also.
305
00:15:55,608 --> 00:15:59,938
As your app runs, and you
want to get the feedback,
306
00:15:59,938 --> 00:16:03,488
you want to see what exactly
is going on inside your app,
307
00:16:03,488 --> 00:16:06,458
so for that purpose
we have a logcat tool,
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00:16:06,458 --> 00:16:08,908
which is inside
your Android Monitor.
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00:16:08,908 --> 00:16:10,998
Whenever you will be
running your app,
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00:16:10,998 --> 00:16:14,578
you will see this-- all the logs
inside your logcat popping up.
311
00:16:14,578 --> 00:16:16,638
So this will keep track
312
00:16:16,638 --> 00:16:19,388
of whatever is going on
inside your emulator,
313
00:16:19,388 --> 00:16:21,188
or your Android device.
314
00:16:21,188 --> 00:16:23,028
So, this is how you put a log.
315
00:16:23,028 --> 00:16:27,098
Log.d -- for debug mode --
give a tag and give the message.
316
00:16:27,098 --> 00:16:30,088
You will learn about logging
in detail in further slides.
317
00:16:30,088 --> 00:16:32,948
So, this is how your
logcat pane looks like.
318
00:16:32,948 --> 00:16:36,298
So you can see, you have
to enter a log statement
319
00:16:36,298 --> 00:16:39,318
inside your Java code,
and then at the bottom,
320
00:16:39,318 --> 00:16:42,868
you will see inside the Android
Monitor there is a logcat pane,
321
00:16:42,868 --> 00:16:45,378
and that's where you can see
whatever the log statement
322
00:16:45,378 --> 00:16:47,378
you have put inside
your Java code.
323
00:16:48,499 --> 00:16:51,089
To learn more,
you can follow these links
324
00:16:51,089 --> 00:16:54,079
about creating and managing
Android Virtual Studio
325
00:16:54,079 --> 00:16:56,569
and different platform versions.
326
00:16:56,791 --> 00:16:58,821
So next you can
follow the concept
327
00:16:58,821 --> 00:17:01,661
in Kit Book exercise 1.1,
328
00:17:01,661 --> 00:17:04,521
and then we are going
to go through with the practicals
329
00:17:04,521 --> 00:17:07,021
of creating your very first
Hello World app,
330
00:17:07,021 --> 00:17:08,831
and run it into the emulator.
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00:17:09,159 --> 00:17:15,779
♪ (upbeat electronic music) ♪