TrueMiner Android GPU Edition

BTC/BCH educational solo miner for Android with CPU, GPU, and CPU+GPU modes.

What was rebuilt

• Redesigned Android layout with separate cards for wallets, pools, performance, Telegram, status, and shares.
• Added Save Settings button using SharedPreferences.
• Added mining mode selector:
  • CPU only
  • GPU only
  • CPU + GPU
• Added GPU backend selector:
  • Auto
  • Vulkan
  • OpenCL
• Added native C++ JNI module under app/src/main/cpp.
• Added Vulkan compute shader under app/src/main/shaders/sha256_miner.comp.
• Added OpenCL dynamic loader for Android vendor libOpenCL.so.
• Fixed CPU miner threading: each worker now pulls unique nonce batches from a shared nonce cursor.
• Fixed SHA-256 thread safety: each hash now uses its own digest instance instead of a shared MessageDigest.
• Fixed Stratum extranonce handling and share submission byte order.
• Added real Telegram send support through the Bot API.
• Added live hashrate callback every few seconds.

Build requirements

Open the project in Android Studio and make sure these SDK components are installed:

• Android SDK Platform 34
• Android SDK Build Tools
• Android NDK
• CMake 3.22+
• Android Gradle Plugin 8.2+

The Vulkan shader is compiled by the Android Gradle shader pipeline from:

app/src/main/shaders/sha256_miner.comp

The native miner then loads the compiled SPIR-V asset at runtime. If the shader asset is missing on your setup, Auto mode will try OpenCL, then native CPU fallback.

Android GPU notes

• Vulkan is the best Android GPU path because Android officially supports Vulkan.
• OpenCL is not exposed by every Android ROM. This app dynamically loads vendor libOpenCL.so when available, so it can work on devices that ship OpenCL without bundling illegal vendor libraries.
• Auto mode tries Vulkan first, OpenCL second, and native CPU fallback last.

Use

1. Enter your BTC address and pool.
2. Optional: enable BCH dual pool.
3. Choose CPU, GPU, or CPU + GPU.
4. Choose Auto, Vulkan, or OpenCL backend.
5. Tap Save Settings.
6. Tap Start.

Disclaimer

Solo mining BTC/BCH on a phone is mostly educational and very unlikely to find a block. Keep mining visible to the user and do not run it secretly or without consent.