Android NFC utility for reading FeliCa cards and writing selected data into SiliCa.

SiliCaTool is a Jetpack Compose Android app that reads FeliCa cards, lets you pick up to four systems and services independently, previews block data, and writes an image to a SiliCa tag. Service blocks are trimmed or zero-padded to 12 blocks, and IDm/PMm, system codes, and service codes are written alongside the data.

• Discover FeliCa systems and services; list services grouped by system even if no system is selected.
• Select up to four systems and four services; choose one service as the write source.
• View block contents with Shift_JIS decoding and block-by-block hex display.
• Write to SiliCa with 12-block limit handling (trim or zero-pad) and IDm/PMm preservation.
• Guided flow: read → select → confirm → write, with error/status messaging.

• Android device with NFC-F (FeliCa) support
• FeliCa card to read
• SiliCa tag to write

• Android Studio (Hedgehog or newer)
• Android SDK 36, build-tools for SDK 36
• JDK 11+

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

Or open the project in Android Studio and run the app module on an NFC-capable device.

1. Launch the app and tap “FeliCa を読み取る,” then present the FeliCa card.
2. Choose systems (optional) and services (required for writing); pick the service whose blocks will be written.
3. Review the summary; if a service has more than 12 blocks you can trim to the first 12, otherwise blocks are zero-padded to 12.
4. Tap “SiliCa に書き込む” and present the SiliCa tag to write IDm/PMm, system codes, service codes, and blocks.

• app/src/main/java/ws/nyaa/silicatool/MainActivity.kt: UI flow and selection logic.
• app/src/main/java/ws/nyaa/silicatool/FelicaClient.kt: Low-level FeliCa read/write logic and framing.
• app/src/main/java/ws/nyaa/silicatool/FelicaModels.kt: Data models and helpers.

MIT

Copyright (c) 2025 KIRISHIKI Yudai