optimize build.gradle

Author: rainyl

android/build.gradle

@@ -68,18 +68,20 @@ android {
 }
 
 def SOURCE_DIR = project.buildscript.sourceFile.parentFile
-def CACHE_DIR = SOURCE_DIR.parentFile
-def CVD_VERSION = new File("${project.buildscript.sourceFile.parentFile.parentFile}/binary.version").text
+def ROOT_DIR = SOURCE_DIR.parentFile
+def CACHE_DIR = new File("${ROOT_DIR}/.dart_tool/.cache")
+def CVD_VERSION = new File("${ROOT_DIR}/binary.version").text
 def CVD_LIB_URL_BASE = "https://github.com/rainyl/opencv_dart/releases/download"
-def ARCHS = ['x86_64', 'arm64-v8a', 'armeabi-v7a']
+def ABI_ALL = ['x86_64', 'arm64-v8a', 'armeabi-v7a']
+def ABI_ACCEPTED = ['x86_64', 'arm64-v8a', 'armeabi-v7a']
 
 def OPENCV_DART_ANDROID_ENABLED_ABI = System.env.OPENCV_DART_ANDROID_ENABLED_ABI ?: null
 if(OPENCV_DART_ANDROID_ENABLED_ABI != null){
     println "[opencv_dart] detected OPENCV_DART_ANDROID_ENABLED_ABI: $OPENCV_DART_ANDROID_ENABLED_ABI"
     def enabledABI = OPENCV_DART_ANDROID_ENABLED_ABI.split(",")
     def acceptedABI = []
     enabledABI.each { abi ->
-        if(ARCHS.contains(abi)){
+        if(ABI_ALL.contains(abi)){
             println "[opencv_dart] add abi: ${abi}"
             acceptedABI.add(abi)
         } else {
@@ -88,40 +90,48 @@ if(OPENCV_DART_ANDROID_ENABLED_ABI != null){
     }
     println "[opencv_dart] accepted abi: $acceptedABI"
     if (acceptedABI){
-        ARCHS = acceptedABI
+        ABI_ACCEPTED = acceptedABI
     } else {
         println "[opencv_dart] invalid OPENCV_DART_ANDROID_ENABLED_ABI: $OPENCV_DART_ANDROID_ENABLED_ABI"
-        println "[opencv_dart] will enable all supported ABI: $ARCHS"
+        println "[opencv_dart] will enable all supported ABI: $ABI_ACCEPTED"
     }
 }
 
-task downloadLibs(type: Download) {
-    println "[opencv_dart] Downloading libraries..."
-    def SRC_URLS = ARCHS.collect { ARCH ->
-        "${CVD_LIB_URL_BASE}/v${CVD_VERSION}/libopencv_dart-android-${ARCH}.tar.gz"
-    }
-    src(SRC_URLS)
-    dest CACHE_DIR
-    overwrite false
-}
-
-ARCHS.each { arch ->
+ABI_ALL.each { arch ->
     def extractTaskName = "opencv_dart_extract_libs_${arch}"
+    def targetDir = new File("${SOURCE_DIR}/src/main/jniLibs/${arch}")
+    if (targetDir.exists() && !ABI_ACCEPTED.contains(arch)) {
+        println "[opencv_dart] Deleting libraries for ${arch}..."
+        delete targetDir
+    }
     task(extractTaskName, type: Copy) {
-        def targetDir = new File("${SOURCE_DIR}/src/main/jniLibs/${arch}")
         onlyIf {
-            !file("${targetDir}/libopencv_dart.so").exists()
+          ABI_ACCEPTED.contains(arch) && !file("${targetDir}/libopencv_dart.so").exists()
+        }
+        doFirst {
+            println "[opencv_dart] Extracting libraries for ${arch}..."
         }
         from tarTree(resources.gzip("${CACHE_DIR}/libopencv_dart-android-${arch}.tar.gz"))
         into targetDir
     }
 }
 
+task downloadLibs(type: Download) {
+    println "[opencv_dart] Downloading libraries..."
+    def SRC_URLS = ABI_ACCEPTED.collect { ARCH ->
+        "${CVD_LIB_URL_BASE}/v${CVD_VERSION}/libopencv_dart-android-${ARCH}.tar.gz"
+    }
+    src(SRC_URLS)
+    dest CACHE_DIR
+    overwrite false
+}
+
 task extractLibs(dependsOn: downloadLibs) {
     println "[opencv_dart] Extracting libraries..."
-    ARCHS.each { arch ->
-        finalizedBy "opencv_dart_extract_libs_${arch}"
+    ABI_ALL.each { arch ->
+        dependsOn "opencv_dart_extract_libs_${arch}"
     }
+
     doLast {
       println "[opencv_dart] Extract finished."
     }