One concept.
A working app.
CodeLabX / LAB 01A working app.
Your first Android app, from the ground up
Understand activities, connect a layout, and make your first button do something.
18 min read Written guide
Loading your workspace…
THE TUTORIAL LIBRARYFind your next
Find your next
“I get it” moment.
Step-by-step lessons. Real explanations. Code you can build on.
6 written guides
Local data.
Real possibilities.
CodeLabX / LAB 02Real possibilities.
Build a local database with SQLite
Save notes on-device with parameterized queries and a small SQLiteOpenHelper.
25 min read Written guide
fun buildSomething()
// start with an idea
return possibility
CodeLabX / LAB 03// start with an idea
return possibility
Kotlin functions & null safety
Write expressive functions and handle missing values without surprises.
12 min read Written guide
Design it. Build it.
Make it yours.
CodeLabX / LAB 04Make it yours.
Design a clean Android layout with XML
Build an accessible sign-in form with predictable spacing and readable labels.
16 min read Written guide
One concept.
A working app.
CodeLabX / LAB 05A working app.
Java classes that model real app data
Turn a note into a small, immutable data model with a clear public interface.
14 min read Written guide
One concept.
A working app.
CodeLabX / LAB 06A working app.
Find your first bug with the debugger
Use breakpoints, variable inspection, and Logcat to understand app behavior.
15 min read Written guide