Section 2 - Introduction To Android Studio

Android Studio Over View:

Lets start, Android studio is a software that you need for in this course. its made my google. it includes both a development environment and a simulator so you can actually see the result of your apps building right there on your machine.its easier then ever to install and does not require any extra software to run unlike previous fashion of an Android studio.just go to

https://developer.android.com/studio/index.html?gclid=Cj0KCQiAlpDQBRDmARIsAAW6-DMeG1bUCFYzgEl3VWI2_RCQNGBDlwx75L9eqbl3ZL_n3dzaFsLHHVQaAuTwEALw_wcB

and click the nice big green Button download Android Studio button

after downloading open the file and install it

Now create our first Android Project

start a new project

you can change the application name like (Demo App)

you can also change the company name or domain name. company name or domain name does not matter much at this point.
the only really importance of the company name here is that the package name would be created from that company domain.The package name is used when you submitting your app to Google Play. The unique way to referencing your app so has to be completed unique but you can change it anytime now click next

Again click next

now select Empty Activity and click next

click finish

now click on top left on project
there are two options one is app(Selection of folders and files that make up of our app) and other is Gradle Scripts(gradle is an open source build tool which is usually Android studio used to build you apps from these folders and files if we want to we add some scripts to do some custom work in the build process )

now double click on the app folder you can see three folders in that the first is manifests and in the manifests file we get the single file AndroidManifest.xml

we do not worry to much for the code All we know to need this point.Android Manifest contains basic details of our app so just the icon, label, app name then the app theme etc. we edit this later on but for now we just leave it as default.

At the bottom there is our res folder for resources and there we put things like icon , images that we use in our app or music if our app needs.

finally then the middle folder java is where the real meet our app lies and specifically we ignore the two test folders for the moment and in that first folder we double click and then click our MainActivity and this is the main file where the code of our app is run so this is your first taste of java but it looks quite scary don't worry it will be second nature in just a few tutorials time. we have a quick summary whats going on here essentially we defining the package.

if we click on three dots here we importing two classes or essential a bundle of codes that will allow our app to work or we importing many more classes later on the course but for the now we just got the default two the first is AppCompatActivity, essentially this make sure our app is back ward compatible with as many older versions of android as possible and then we just got the operating system bundle that allow us to work with the android operating system

and then finally here we creating a class called MainActivity which will allow us to work with the Activity we created so remember the screen will display the uses

Now we go back to res-->layout-->activity_main.xml now double click on that and now what's our app look like and there it is.That xml file define layout and look our activity or the screen that we represent to users
left hand side you see the various user interfaces elements that we can drag in to over app...we have some layouts that show on the left side of the screen we will look out all of that later on our course and also see the Widgets things like textview , edittext , buttons etc

so on the top right side the you see the Device Screen and in that we got a RelativeLayout which essentially means that everything is laid out relative to whats around it so if we add a second textview beneath the tinny hello world one that would be display relative to the first one and finally at the bottom we got properties which would very dependent on element that you selected and here is huge range of properties can use to customize in each individual element.
we work on two main activity files one is activity_main.xml file and other is MainActivity of java file.