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Google Developers Study Jam
Android for Beginners. Lesson 2
Constantine Mars
Co-Organizer @ GDG Dnipropetrovs’k
Senior Developer @ DataArt
[email protected]
+ConstantineMars
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Agenda
● Enroll to Jam:
https://www.udacity.com/account/affiliate/GoogleStudyJams
● Go to the course:
https://www.udacity.com/course/android-development-for-begi
nners--ud837
● Learn
● Make Practice Set 2 and send to
[email protected] with subject “Practice Set 2”
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Lesson 2A: Making an App
Interactive
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New project: Just Java
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Stages of development
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Stages
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activity_main.xml
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Preview
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Layout
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Creating an activity
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Activities
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Activities
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File types
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Comments
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Bind method in xml
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Set text programmatically
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Test count
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Arithmetic expressions
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Second TextView
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Auto-import
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Prototyping calculations
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Variables
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Variables
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Data Type
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Variable in code
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Variable Name
https://docs.oracle.com/javase/tutorial/java/nutsandbolts/variables.html
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Assignment operator
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Sum up
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Declaring numberOfCoffees variable
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Crash
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Crash
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Compilation error
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Make app crash: rename onClick method name
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DDMS, LogCat, Read Logs
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Fix the error
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Adding more controls
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Test it
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Debug. Breakpoints
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Debugging
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Debugging
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Variable Scope
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Global (class) variable
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.decrement() implementation
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Lesson 2B: Making an App
Interactive
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Resources
http://androidweekly.net/
https://www.materialup.com/
http://www.google.com/design/spec/material-design/introduction.html
https://github.com/udacity/Just-Java
Udacity course on Git:
https://www.udacity.com/course/how-to-use-git-and-github--ud775
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Changing layout
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Nested Viewgroups
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Examples
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Designing interface
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Designing interface
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String
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String variables
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Escape sequence
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Concatenation
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Concatenation
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Concatenate string with int
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Alittle bit more complicated
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Practice Set 2
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Score Counter
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One Team View
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Two Team Views
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Extra: try to avoid duplication of xml
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Reset button
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Advice: Make an App Than May Save Somebody’s Life
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See you on certification ceremony :)
Study Jam: Android for Beginners
Constantine Mars
Co-Organizer @ GDG Dnipropetrovs’k
Senior Developer @ DataArt
[email protected]
+ConstantineMars