AAR package build and test with CI

- Use the same tools and plugins for SDK build and AAR build
- Added script to test Gradle-based samples against local maven repo
- Various local fixes and debug prints

cmake/android/android_gradle_projects.cmake

@@ -114,8 +114,7 @@ endif()
 
 file(WRITE "${ANDROID_BUILD_BASE_DIR}/settings.gradle" "
 gradle.ext {
-    //opencv_source = 'maven_central'
-    //opencv_source = 'maven_local'
+    // possible options: 'maven_central', 'maven_local', 'sdk_path'
     opencv_source = 'sdk_path'
 }
 
@@ -126,19 +125,18 @@ file(WRITE "${ANDROID_TMP_INSTALL_BASE_DIR}/settings.gradle" "
 rootProject.name = 'opencv_samples'
 
 gradle.ext {
-    //opencv_source = 'maven_central'
-    //opencv_source = 'maven_local'
+    // possible options: 'maven_central', 'maven_local', 'sdk_path'
     opencv_source = 'sdk_path'
 }
 
 if (gradle.opencv_source == 'maven_local') {
     gradle.ext {
-        opencv_maven_path = '/<path_to_maven_repo>'
+        opencv_maven_path = '<path_to_maven_repo>'
     }
 }
 
 if (gradle.opencv_source == 'sdk_path') {
-    def opencvsdk='../'
+    def opencvsdk = '../'
     //def opencvsdk='/<path to OpenCV-android-sdk>'
     //println opencvsdk
     include ':opencv'

platforms/android/aar-template/build.gradle

@@ -1,4 +1,4 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id 'com.android.library' version '8.0.2' apply false
-}
+    id 'com.android.library' version '7.3.0' apply false
+}

platforms/android/aar-template/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 #Mon Jul 10 11:57:38 SGT 2023
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.3-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

platforms/android/build-tests/test_gradle.sh

@@ -1,5 +1,6 @@
 #!/bin/bash -e
 SDK_DIR=$1
+
 echo "OpenCV Android SDK path: ${SDK_DIR}"
 
 ANDROID_HOME=${ANDROID_HOME:-${ANDROID_SDK_ROOT:-${ANDROID_SDK?Required ANDROID_HOME/ANDROID_SDK/ANDROID_SDK_ROOT}}}
@@ -29,9 +30,10 @@ rm -rf "test-gradle"
 cp -rp "${SDK_DIR}" "test-gradle"
 echo "Cloning OpenCV Android SDK ... Done!"
 
-echo "Force Current CMake for Gradle project"
 # drop cmake bin name and "bin" folder from path
-echo "cmake.dir=$(dirname $(dirname $(which cmake)))" > "test-gradle/samples/local.properties"
+echo "ndk.dir=${ANDROID_NDK}" > "test-gradle/samples/local.properties"
+echo "cmake.dir=$(dirname $(dirname $(which cmake)))" >> "test-gradle/samples/local.properties"
+
 echo "Run gradle ..."
 (cd "test-gradle/samples"; ./gradlew -i assemble)
 

platforms/android/build-tests/test_gradle_aar.sh

@@ -0,0 +1,47 @@
+#!/bin/bash -e
+SDK_DIR=$1
+LOCAL_MAVEN_REPO=$2
+echo "OpenCV Android SDK path: ${SDK_DIR}"
+echo "Use local maven repo from $LOCAL_MAVEN_REPO"
+
+ANDROID_HOME=${ANDROID_HOME:-${ANDROID_SDK_ROOT:-${ANDROID_SDK?Required ANDROID_HOME/ANDROID_SDK/ANDROID_SDK_ROOT}}}
+ANDROID_NDK=${ANDROID_NDK_HOME-${ANDROID_NDK:-${NDKROOT?Required ANDROID_NDK_HOME/ANDROID_NDK/NDKROOT}}}
+
+echo "Android SDK: ${ANDROID_HOME}"
+echo "Android NDK: ${ANDROID_NDK}"
+
+if [ ! -d "${ANDROID_HOME}" ]; then
+  echo "FATAL: Missing Android SDK directory"
+  exit 1
+fi
+if [ ! -d "${ANDROID_NDK}" ]; then
+  echo "FATAL: Missing Android NDK directory"
+  exit 1
+fi
+
+export ANDROID_HOME=${ANDROID_HOME}
+export ANDROID_SDK=${ANDROID_HOME}
+export ANDROID_SDK_ROOT=${ANDROID_HOME}
+
+export ANDROID_NDK=${ANDROID_NDK}
+export ANDROID_NDK_HOME=${ANDROID_NDK}
+
+echo "Cloning OpenCV Android SDK ..."
+rm -rf "test-gradle-aar"
+mkdir test-gradle-aar
+cp -rp ${SDK_DIR}/samples/* test-gradle-aar/
+echo "Cloning OpenCV Android SDK ... Done!"
+
+# drop cmake bin name and "bin" folder from path
+echo "ndk.dir=${ANDROID_NDK}" > "test-gradle-aar/local.properties"
+echo "cmake.dir=$(dirname $(dirname $(which cmake)))" >> "test-gradle-aar/local.properties"
+
+sed -i "s/opencv_source = 'sdk_path'/opencv_source = 'maven_local'/g" test-gradle-aar/settings.gradle
+sed -i "s+opencv_maven_path = '<path_to_maven_repo>'+opencv_maven_path = 'file\\://$LOCAL_MAVEN_REPO'+g" test-gradle-aar/settings.gradle
+
+echo "Run gradle ..."
+(cd "test-gradle-aar"; ./gradlew -i assemble)
+
+echo "#"
+echo "# Done!"
+echo "#"

platforms/android/build_java_shared_aar.py

@@ -100,6 +100,16 @@ def main(args):
                   path.join(ANDROID_PROJECT_DIR, "OpenCV/src/main/cpp/CMakeLists.txt"),
                   {"LIB_NAME": lib_name, "LIB_TYPE": "SHARED"})
 
+    local_props = ""
+    if args.ndk_location:
+        local_props += "ndk.dir=" + args.ndk_location + "\n"
+    if args.cmake_location:
+        local_props += "cmake.dir=" + args.cmake_location + "\n"
+
+    if local_props:
+        with open(path.join(ANDROID_PROJECT_DIR, "local.properties"), "wt") as f:
+            f.write(local_props)
+
     # Copying Java code and C++ public headers from SDK to the Android project
     for src, dst in COPY_FROM_SDK_TO_ANDROID_PROJECT:
         shutil.copytree(path.join(args.opencv_sdk_path, src),
@@ -149,8 +159,10 @@ if __name__ == "__main__":
     parser.add_argument('opencv_sdk_path')
     parser.add_argument('--android_compile_sdk', default="26")
     parser.add_argument('--android_min_sdk', default="21")
-    parser.add_argument('--android_target_sdk', default="26")
+    parser.add_argument('--android_target_sdk', default="31")
     parser.add_argument('--java_version', default="1_8")
+    parser.add_argument('--ndk_location', default="")
+    parser.add_argument('--cmake_location', default="")
     args = parser.parse_args()
 
     main(args)

platforms/android/build_static_aar.py

@@ -131,6 +131,16 @@ def main(args):
                   path.join(ANDROID_PROJECT_DIR, "OpenCV/src/main/cpp/CMakeLists.txt"),
                   {"LIB_NAME": "templib", "LIB_TYPE": "STATIC"})
 
+    local_props = ""
+    if args.ndk_location:
+        local_props += "ndk.dir=" + args.ndk_location + "\n"
+    if args.cmake_location:
+        local_props += "cmake.dir=" + args.cmake_location + "\n"
+
+    if local_props:
+        with open(path.join(ANDROID_PROJECT_DIR, "local.properties"), "wt") as f:
+            f.write(local_props)
+
     opencv_libs = get_list_of_opencv_libs(sdk_dir)
     external_libs = get_list_of_3rdparty_libs(sdk_dir, abis)
 
@@ -224,6 +234,8 @@ if __name__ == "__main__":
     parser.add_argument('--android_min_sdk', default="21")
     parser.add_argument('--android_target_sdk', default="26")
     parser.add_argument('--java_version', default="1_8")
+    parser.add_argument('--ndk_location', default="")
+    parser.add_argument('--cmake_location', default="")
     args = parser.parse_args()
 
     main(args)

samples/android/15-puzzle/build.gradle.in

@@ -28,9 +28,11 @@ android {
 
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
-    if (gradle.opencv_source == "sdk_path") {
+    if (gradle.opencv_source == 'sdk_path') {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
-    } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+    } else if (gradle.opencv_source == 'maven_local' || gradle.opencv_source == 'maven_cenral') {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/camera-calibration/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/color-blob-detection/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/face-detection/build.gradle.in

@@ -53,8 +53,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/face-detection/jni/CMakeLists.txt

@@ -4,8 +4,10 @@ set(target detection_based_tracker)
 project(${target} CXX)
 
 if (OPENCV_FROM_SDK)
+  message(STATUS "Using OpenCV from local SDK")
   set(ANDROID_OPENCV_COMPONENTS "opencv_java" CACHE STRING "")
 else()
+  message(STATUS "Using OpenCV from AAR (Maven repo)")
   set(ANDROID_OPENCV_COMPONENTS "OpenCV::opencv_java${OPENCV_VERSION_MAJOR}" CACHE STRING "")
 endif()
 

samples/android/image-manipulations/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/mobilenet-objdetect/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/tutorial-1-camerapreview/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/tutorial-2-mixedprocessing/build.gradle.in

@@ -53,8 +53,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }

samples/android/tutorial-2-mixedprocessing/jni/CMakeLists.txt

@@ -4,8 +4,10 @@ set(target mixed_sample)
 project(${target} CXX)
 
 if (OPENCV_FROM_SDK)
+  message(STATUS "Using OpenCV from local SDK")
   set(ANDROID_OPENCV_COMPONENTS "opencv_java" CACHE STRING "")
 else()
+  message(STATUS "Using OpenCV from AAR (Maven repo)")
   set(ANDROID_OPENCV_COMPONENTS "OpenCV::opencv_java${OPENCV_VERSION_MAJOR}" CACHE STRING "")
 endif()
 

samples/android/tutorial-3-cameracontrol/build.gradle.in

@@ -29,8 +29,10 @@ android {
 dependencies {
     //implementation fileTree(dir: 'libs', include: ['*.jar'])
     if (gradle.opencv_source == "sdk_path") {
+        println 'Using OpenCV from SDK'
         implementation project(':opencv')
     } else if (gradle.opencv_source == "maven_local" || gradle.opencv_source == "maven_cenral") {
+        println 'Using OpenCV from Maven repo'
         implementation 'org.opencv:opencv:@OPENCV_VERSION_PLAIN@'
     }
 }