Android StudyJam session 3

Deck from the Android StudyJam event where we walked through the Udacity course on Android Fundamentals

Transcript

1. JAVA AND OOP ANDROIDPHILLY STUDY JAM 3
2. TEXT BASIC PROGRAMMING ▸ Given some inputs you want some outputs ▸ I have a city name, give me the weather ▸ I have a message, I want it to appear on Twitter
3. TEXT SO BASIC PROGRAMMING…
4. TEXT WEATHER APP
5. TEXT BASIC JAVA ▸ Variables (with data types ): int count = 5 ▸ Collections : Array, ArrayList, etc: ▸ int[] numbers = new Int [] { 1, 2, 3 } ▸ Conditionals: ▸ if / else, switch, etc ▸ Functions / Methods ▸ private int getMaxValue(int valueA, int valueB) { … } ▸ Classes ▸ Packages
6. TEXT BASIC ANDROID ▸ Layout Files ▸ Resources ▸ Java Files ▸ …gradle
7. TEXT DEFINING VS CALLING A METHOD ▸ Method inputs (arguments) ▸ Output from a method (the Cake example) ▸ Using Return values ▸ Exercise: Implement Submit order (return a string representing the summary text) ▸ Exercise: Modifying the code to read: “Price Summary” and then the text
8. TEXT ANDROID RESOURCES ▸ XML Layouts, Text, Images, Icons, Measurements, Audio files, etc ▸ AAPT compiles resources to an R file ▸ Code ▸ R.drawable.zzz ▸ R.string.zzz ▸ R.id.zzz ▸ XML: ▸ @drawable / zzz ▸ @string/zzz ▸ @id/zzz (or if you are creating it @+id/zzz)
9. TEXT XML + JAVA
10. TEXT JAVA OBJECTS
11. TEXT
12. TEXT
13. TEXT
14. TEXT CREATING JAVA OBJECTS
15. TEXT
16. TEXT ▸ Inheritance ▸ Using the findViewById() method ▸ Casting ▸ Set data on views
17. TEXT ▸ Java if/else ▸ Prevent -ve values for coffee examples ▸ Intents ▸ Styles
18. BONUS ROUND IF I WAS TO ASK YOU… ▸ Take a number. If the number is below 10, print “thats low”, otherwise print “thats high”
19. TEXT