Expose core JNI helpers to Kotlin and demo via Android example (#33)

* Expose core JNI helpers to Kotlin and demo via Android example

- add JNI wrappers for wallet ops + extra methods (maintenanceRefresh,
tryClaimLightningReceive, offboardAll, peakKeyPair, verifyMessage,
bolt11Invoice) and log config use - add Kotlin facade (NitroArkNative)
and example RN module to surface these native calls - wire Android demo
buttons in example app to exercise the JNI path with config passthrough
and logging

* Refactor NativeTypes and update JNI method signatures

* Add null pointer checks in JNI helper functions

* Add maintenance method to NitroArkNative

* Refactor optional number retrieval in JNI wrapper

* Add ARMv7 support to Android build script

* Add Android JNI methods for signing and syncing

* Improve memory management in NitroArkJni with local ref deletion

* Refactor log formatting for birthday height in NitroArkJni

* Add robust error handling for JNI string conversions

* chore: bump version

Author: niteshbalusu11

.zed/settings.json

@@ -24,5 +24,14 @@
       "formatter": "language_server",
       "format_on_save": "on"
     }
+  },
+  "lsp": {
+    "rust-analyzer": {
+      "initialization_options": {
+        "check": {
+          "command": "clippy"
+        }
+      }
+    }
   }
 }

bark-cpp/build-android.sh

@@ -78,6 +78,7 @@ rm -rf "$OUTPUT_DIR"
 
 # Create output directory structure
 mkdir -p "$OUTPUT_DIR/arm64-v8a"
+mkdir -p "$OUTPUT_DIR/armeabi-v7a"
 mkdir -p "$OUTPUT_DIR/x86_64"
 
 echo "Building for Android..."
@@ -127,6 +128,30 @@ if [ -z "$ARM64_CXX_LIB_PATH" ]; then
 fi
 cp "$ARM64_CXX_LIB_PATH" "$OUTPUT_DIR/arm64-v8a/"
 
+# --- Build for ARMv7 (armv7-linux-androideabi) ---
+echo "Building for armeabi-v7a..."
+TARGET_ARCH_ARMV7="armv7-linux-androideabi"
+TARGET_DIR_ARMV7="target/$TARGET_ARCH_ARMV7/$BUILD_TYPE"
+
+export TARGET_AR="$TOOLCHAIN_PATH/bin/llvm-ar"
+export TARGET_CC="$TOOLCHAIN_PATH/bin/armv7a-linux-androideabi$API_LEVEL-clang"
+export TARGET_CXX="$TOOLCHAIN_PATH/bin/armv7a-linux-androideabi$API_LEVEL-clang++"
+export CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_AR="$TOOLCHAIN_PATH/bin/llvm-ar"
+export CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_LINKER="$TOOLCHAIN_PATH/bin/armv7a-linux-androideabi$API_LEVEL-clang"
+export CARGO_TARGET_ARMV7_LINUX_ANDROIDEABI_RANLIB="$TOOLCHAIN_PATH/bin/llvm-ranlib"
+export OPENSSL_INCLUDE_DIR="$PWD/target/$TARGET_ARCH_ARMV7/$BUILD_TYPE/build/openssl-sys-*/out/include"
+export OPENSSL_LIB_DIR="$PWD/target/$TARGET_ARCH_ARMV7/$BUILD_TYPE/build/openssl-sys-*/out/lib"
+
+rustup target add $TARGET_ARCH_ARMV7
+cargo build --target=$TARGET_ARCH_ARMV7 $CARGO_FLAG --lib
+cp "$TARGET_DIR_ARMV7/$BINARY_NAME" "$OUTPUT_DIR/armeabi-v7a/"
+ARMV7_CXX_LIB_PATH=$(find "$TARGET_DIR_ARMV7/build" -name "$CXX_BINARY_NAME" | head -n 1)
+if [ -z "$ARMV7_CXX_LIB_PATH" ]; then
+    echo "Error: Could not find CXX bridge library for armeabi-v7a."
+    exit 1
+fi
+cp "$ARMV7_CXX_LIB_PATH" "$OUTPUT_DIR/armeabi-v7a/"
+
 # --- Build for x86_64 (x86_64-linux-android) ---
 echo "Building for x86_64..."
 TARGET_ARCH_X86_64="x86_64-linux-android"
@@ -153,15 +178,21 @@ cp "$X86_64_CXX_LIB_PATH" "$OUTPUT_DIR/x86_64/"
 
 # --- Copy binaries to React Native project ---
 DEST_JNI_DIR_ARM64="../../react-native-nitro-ark/react-native-nitro-ark/android/src/main/jniLibs/arm64-v8a"
+DEST_JNI_DIR_ARMV7="../../react-native-nitro-ark/react-native-nitro-ark/android/src/main/jniLibs/armeabi-v7a"
 DEST_JNI_DIR_X86_64="../../react-native-nitro-ark/react-native-nitro-ark/android/src/main/jniLibs/x86_64"
 
 mkdir -p "$DEST_JNI_DIR_ARM64"
+mkdir -p "$DEST_JNI_DIR_ARMV7"
 mkdir -p "$DEST_JNI_DIR_X86_64"
 
 echo "Copying arm64-v8a binary..."
 cp -f "$OUTPUT_DIR/arm64-v8a/$BINARY_NAME" "$DEST_JNI_DIR_ARM64/"
 cp -f "$OUTPUT_DIR/arm64-v8a/$CXX_BINARY_NAME" "$DEST_JNI_DIR_ARM64/"
 
+echo "Copying armeabi-v7a binary..."
+cp -f "$OUTPUT_DIR/armeabi-v7a/$BINARY_NAME" "$DEST_JNI_DIR_ARMV7/"
+cp -f "$OUTPUT_DIR/armeabi-v7a/$CXX_BINARY_NAME" "$DEST_JNI_DIR_ARMV7/"
+
 echo "Copying x86_64 binary..."
 cp -f "$OUTPUT_DIR/x86_64/$BINARY_NAME" "$DEST_JNI_DIR_X86_64/"
 cp -f "$OUTPUT_DIR/x86_64/$CXX_BINARY_NAME" "$DEST_JNI_DIR_X86_64/"

react-native-nitro-ark/android/CMakeLists.txt

@@ -28,6 +28,7 @@ add_library(
   ${PROJECT_NAME}
   SHARED
   src/main/cpp/cpp-adapter.cpp
+  src/main/cpp/NitroArkJni.cpp
   ../cpp/HybridArk.cpp
 )