refactor: enhance Android build scripts with dynamic example discovery and configurable ABI, and correct LLM SDK path.

examples/LLMs/cpp/build-android.sh

@@ -1,11 +1,75 @@
 #!/bin/bash
-if [ ! -d "$NDK_PATH" ]; then
-    echo "Error: NDK_PATH '$NDK_PATH' not found."
-    echo "Please set NDK_PATH environment variable to your Android NDK directory."
+set -e
+
+#
+# Copyright (C) 2024-2025 Amlogic, Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+usage() {
+    echo "Usage: $0 [-a <target_abi>]"
+    echo "  -a <target_abi> : Target ABI (default: arm64-v8a)"
+    echo "  -h              : Show this help message"
     exit 1
+}
+
+# Default values
+TARGET_ABI=arm64-v8a
+
+# Parse arguments
+while getopts 'a:h' opt; do
+  case "$opt" in
+    a)
+      TARGET_ABI=$OPTARG
+      ;;
+    h)
+      usage
+      ;;
+    *)
+      usage
+      ;;
+  esac
+done
+
+if [ -z "${ANDROID_NDK_PATH}" ]; then
+    if [ -n "${ANDROID_NDK}" ]; then
+        ANDROID_NDK_PATH=${ANDROID_NDK}
+    elif [ -n "${ANDROID_NDK_HOME}" ]; then
+        ANDROID_NDK_PATH=${ANDROID_NDK_HOME}
+    else
+        echo "Error: ANDROID_NDK_PATH is not set."
+        echo "Please set ANDROID_NDK_PATH to your Android NDK directory."
+        exit 1
+    fi
 fi
 
-$NDK_PATH/ndk-build \
-    NDK_PROJECT_PATH=. \
-    APP_BUILD_SCRIPT=./Android.mk \
-    NDK_APPLICATION_MK=./Application.mk
+ROOT_PWD=$(cd "$(dirname $0)" && pwd)
+BUILD_DIR=${ROOT_PWD}/build/android
+
+echo "Building LLMs for Android (ndk-build)..."
+echo "NDK_PATH: ${ANDROID_NDK_PATH}"
+echo "TARGET_ABI: ${TARGET_ABI}"
+echo "BUILD_DIR: ${BUILD_DIR}"
+
+mkdir -p ${BUILD_DIR}
+
+${ANDROID_NDK_PATH}/ndk-build \
+    NDK_PROJECT_PATH="${ROOT_PWD}" \
+    APP_BUILD_SCRIPT="${ROOT_PWD}/Android.mk" \
+    NDK_APPLICATION_MK="${ROOT_PWD}/Application.mk" \
+    NDK_OUT="${BUILD_DIR}/obj" \
+    NDK_LIBS_OUT="${BUILD_DIR}/libs" \
+    APP_ABI="${TARGET_ABI}"
+
+echo "Build complete. Libs in ${BUILD_DIR}/libs"