A modern Android counter app built with Jetpack Compose and Material 3.
🔗 Repository: github.com/simpleneeraj/counter
Increment · Decrement · Reset — with smooth animation, haptics, and a Goodreads-inspired theme.
| At zero — controls disabled | Counting — active controls |
|---|---|
 |
 |
The − and Reset controls dim and disable themselves at 0; the decrement button turns Goodreads-green once counting.
- Animated counter — the number slides up on increment and down on decrement with a cross-fade (
AnimatedContent). - State that survives config changes — the count is held in
rememberSaveable, so it persists across rotation. - Intentional floor at 0 — the counter never goes negative; the
−and Reset controls disable and dim themselves at zero. - Haptic feedback on every tap.
- Goodreads-inspired Material 3 theme — warm cream backgrounds, deep sepia-brown primary, and a green accent, with full light/dark support.
- Large circular buttons with proper touch targets, ripple, and tonal elevation; a pill-shaped reset button.
| Language | Kotlin |
| UI | Jetpack Compose, Material 3 |
| Min SDK | 26 (Android 8.0) |
| Compile / Target SDK | 36 (Android 16) |
| Build | Gradle (Kotlin DSL), AGP 9 |
# Debug build
./gradlew assembleDebug
# Install to a connected device
./gradlew installDebug
adb shell am start -n com.example.counter/.MainActivity- Enable Developer options → USB debugging, then tap Allow on the USB debugging prompt.
- For tap feedback, enable Touch / Haptic feedback in the device's Sound & vibration settings.
Signing credentials are read from a git-ignored keystore.properties at the project root:
storeFile=release-key.jks
storePassword=********
keyAlias=********
keyPassword=********Generate a keystore and build:
keytool -genkeypair -v -keystore app/release-key.jks \
-alias counter -keyalg RSA -keysize 2048 -validity 10000
./gradlew assembleRelease
# -> app/build/outputs/apk/release/app-release.apkThe release build enables R8 code shrinking and resource shrinking.
The keystore (
*.jks) andkeystore.propertiesare excluded from version control. Back them up — Play Store updates must be signed with the same key.