Merge pull request #210 from rainyl/android-build

check libs for android

Author: rainyl

android/build.gradle

@@ -68,39 +68,47 @@ 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 CVD_LIB_URL_BASE = "https://github.com/rainyl/opencv_dart/releases/download"
 def ARCHS = ['x86_64', 'arm64-v8a', 'armeabi-v7a']
 
 task downloadLibs(type: Download) {
-    println "Downloading opencv_dart libraries..."
+    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 SOURCE_DIR
+    dest CACHE_DIR
     overwrite false
 }
 
 ARCHS.each { arch ->
     def extractTaskName = "opencv_dart_extract_libs_${arch}"
     task(extractTaskName, type: Copy) {
-        from tarTree(resources.gzip("${SOURCE_DIR}/libopencv_dart-android-${arch}.tar.gz"))
-        into "${SOURCE_DIR}/src/main/jniLibs/${arch}"
+        def targetDir = new File("${SOURCE_DIR}/src/main/jniLibs/${arch}")
+        onlyIf {
+            !file("${targetDir}/libopencv_dart.so").exists()
+        }
+        from tarTree(resources.gzip("${CACHE_DIR}/libopencv_dart-android-${arch}.tar.gz"))
+        into targetDir
     }
 }
 
 task extractLibs(dependsOn: downloadLibs) {
-    println "Extracting opencv_dart libraries..."
+    println "[opencv_dart] Extracting libraries..."
     ARCHS.each { arch ->
         finalizedBy "opencv_dart_extract_libs_${arch}"
     }
+    doLast {
+      println "[opencv_dart] Extract finished."
+    }
 }
 
-def OPENCV_DART_DISABLE_AUTO_BUILD=System.env.OPENCV_DART_DISABLE_AUTO_BUILD ?: null
+def OPENCV_DART_DISABLE_AUTO_BUILD = System.env.OPENCV_DART_DISABLE_AUTO_BUILD ?: null
 if (OPENCV_DART_DISABLE_AUTO_BUILD != null) {
-    println "Found OPENCV_DART_DISABLE_AUTO_BUILD, skip auto build"
+    println "[opencv_dart] Found OPENCV_DART_DISABLE_AUTO_BUILD, skip auto build"
 } else {
-    println "OPENCV_DART_DISABLE_AUTO_BUILD is not set, running OpenCV setup"
+    println "[opencv_dart] OPENCV_DART_DISABLE_AUTO_BUILD is not set, running setup"
     preBuild.dependsOn extractLibs
 }