Clean-room Android business and retail calculator prototype built with Kotlin, Jetpack Compose, and a pure Kotlin calculation core.

Target GitHub repository: FlintsLabs/flintcalc-android.

• core: calculator engine, formatting, tax, memory, grand total, and cost/sell/margin logic.
• app: Android Compose UI that depends on core.

JAVA_HOME=/opt/homebrew/opt/java ./gradlew :core:test :app:assembleDebug

Release bundle:

JAVA_HOME=/opt/homebrew/opt/java ./gradlew :app:bundleRelease

The local Android SDK path is configured in local.properties for this machine:

sdk.dir=/Users/kanokpichasonsmacbookair/Library/Developer/Xamarin/android-sdk-macosx

Core unit tests cover:

• Running-total behavior: 1 + 2 x 3 = 9
• Context percent: 100 + 10 % = 110, 100 - 10 % = 90, 100 x 10 % = 10
• Tax add/remove at 7%
• Cost/Sell/Margin calculations
• Memory, grand total, square root, backspace, and sign change