My Session in Kotlin Workshop held on Jul 29th 2017 in collaboration between Kotlin Egypt and GDG Cairo. https://www.facebook.com/kotlinegypt/

1. Kotlin For Android
By Ahmed Nabil (AhmedNMahran)

2. Contents
1. About Me
2. Me and Kotlin
3. Kotlin and Java
4. Kotlin Libraries
5. Questions

3. About Me
Writing code from the age of 11 :)
Participated in a lot of programs from Microsoft and Google.
Google, Microsoft, Oracle, Udacity and MCIT Certified.
Participated in many hackathons.
Android Developer at Hungerstation | Delivery Hero.
Founder and Leader of Egyptian Kotlin Community (Kotlin Egypt).

4. What Is Kotlin
Named after Kotlin Island in Russia
Developed by Jetbrains. 2010
Statically Typed Language
Works on JVM
Used in front-end, backend, and mobile apps.

5. Features
Interoperability
Simplicity
Null Safety

6. Model In Java !
public class Customer {
private String name;
private String email;
private String company;
public Customer(String name) {
this(name, "", "");
}
public Customer(String name, String email) {
this(name, email, "");
}

7. Still in Java
public Customer(String name, String email, String company) {
this.name = name;
this.email = email;
this.company = company;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}

8. And… Java :D
public void setEmail(String email) {
this.email = email;
}
public String getCompany() {
return company;
}
public void setCompany(String company) {
this.company = company;
}

9. Java.. too
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Customer customer = (Customer) o;
if (name != null ? !name.equals(customer.name) : customer.name != null) return false;
if (email != null ? !email.equals(customer.email) : customer.email != null) return false;
return company != null ? company.equals(customer.company) : customer.company == null;
}

10. Finally, end of java code
@Override
public int hashCode() {
int result = name != null ? name.hashCode() : 0;
result = 31 * result + (email != null ? email.hashCode() : 0);
result = 31 * result + (company != null ? company.hashCode() : 0);
return result;
}
@Override
public String toString() {
return "Customer{" +
"name='" + name + ''' +
", email='" + email + ''' +
", company='" + company + ''' +
'}';
}
}

11. In Kotlin
data class Customer(var name: String, var email: String = "",
var company: String = "")

12. Kotlin Libs
1. Kotlin extension
a. No more Butterknife,
b. No more findViewById()
2. Anko
a. Layouts
b. Intents
c. Dialogs
d. Database
e. And more, check it out...

13. Result
Who Wins?

14. Questions
?

15. Lets write some code
1. val and var
2. Arrays
3. Ranges
4. Smart Casting
5. Null Safety
6. Extension Functions

16. Resources
https://en.wikipedia.org/wiki/Kotlin
https://android.jlelse.eu/kick-starting-android-development-with-kotlin-diving-
into-kotlin-code-35e2637c7eda
https://android-developers.googleblog.com/2017/05/android-announces-
support-for-kotlin.html
https://www.youtube.com/watch?v=H_oGi8uuDpA

17. Let’s keep in touch
Facebook: https://www.facebook.com/ahmednmahran1
Twitter: @AhmedNMahran
LinkedIn: https://www.linkedin.com/in/ahmed-nabil-35a05a94/
Github: AhmedNMahran
Instagram: AhmedNmahran
Kotlin Egypt FB page: https://www.facebook.com/kotlinegypt/