Android Livecoding Series Part 1 creating simple calculator application

1. Android Livecoding Series
Part 1. Create a calculator application

2. ● https://www.youtube.com/watch?v=
ZuFN9CurHqA
● https://www.youtube.com/watch?
v=6TQtrXyeIhY
Warming up...

3. ● Android Developer di qiscus
● Penulis buku “Livecoding! 9 Aplikasi Android
Buatan Sendiri”
● omayib@gmail.com (email) | @omayib
(Twitter)
“jika pelukis memilki kanvas untuk mencurahkan imajinasinya,
Maka programmer punya RAM yang bisa di manipulasi sesuai
imajinasi”
Arif Akbarul Huda

4. ● Www.developer.android.com
● Livecoding! 9 Aplikasi
Android Buatan Sendiri
Recommended Reference

5. Ideas...
Calculator
Application

6. mockup...
Basic Requirement
With 2 input number, the apps should do:
- addition
- subtraction
- product
- division

7. Goal...
✔ Java Basic
✔ Math Logic Implementation
✔ Button Event Handler
✔ EditText
✔ TextView
By this case study, you learn about

8. Creating new project...
1 2
4
3

9. Android Studio Environment

10. Android Project Structure

11. Android Emulator

12. Step 1
Start from layout because visual is easy to understand

13. Step 3
btnPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
double i1=Double.parseDouble(editTextInput1.getText().toString());
double i2=Double.parseDouble(editTextInput2.getText().toString());
double additionResult=i1+i2;
textViewOutput.setText(String.valueOf(additionResult));
}
});

14. Step 4
Separate calculator logic from UI logic
MainActivity.java Calculator.java

15. Excercises...
Dear Friends..
I am Jono as director of Ramaiana Dept. Store.
Everyday we have promotion program.
We offer to customer with discount 45-75% on
specifiec items.
Can you help me to create android application
that can calculate the net price? This apps will be
used by our customers.