Sankara

Android app for passive NFC e-ink displays — Thomas Sankara–inspired UI, built for the Waveshare 2.7" module (264×176 B/W).

Based on joshuatz/nfc-epaper-writer.

Additions over upstream

• Default display: 2.7" (264×176, SDK type 6)
• Samsung NFC timeout raised to 30s (stock SDK uses ~1.2s)
• Floyd–Steinberg B/W dithering on gallery images
• Now playing card (track + artist) via MediaSessionManager + notification listener
• Screen kept on during NFC sync

Build & install (ADB)

cd eink-case-app
./gradlew assembleDebug
adb install -r app/build/outputs/apk/debug/app-debug.apk

Or open in Android Studio → Run on device.

First-run setup

1. Enable NFC on the phone.
2. Tap Enable Now Playing Access → allow E-Ink Case in notification listener settings (for track detection).
3. Confirm toolbar shows 2.7" (gear icon to change if needed).

Push an image

1. Load Image → crop → auto-dither → hold phone on module when prompted.
2. Now Playing → E-Ink → start music → tap button → hold phone on module.

Debug NFC on Samsung

adb logcat -s NfcFlasher WaveShareHandler

Hardware

Item	Spec
Module	Waveshare 2.7" NFC-Powered e-Paper (B08B3RG439)
Resolution	264 × 176, black/white
SDK type	6
Sync time	~15–30 seconds, phone upper-back against module coil

License

Upstream NFC E-Ink Writer is MIT. Waveshare NFC.jar is vendor-provided; see Waveshare wiki.