Android Plugin custom arch support

README.md

@@ -19,7 +19,7 @@ OpenCV Bindings for Dart Language. Support both asynchronous and synchronous!
 > 1. If you want to setup manually, please set `OPENCV_DART_DISABLE_AUTO_BUILD` environment variable,
 > e.g., `export OPENCV_DART_DISABLE_AUTO_BUILD=1`(for Unix-like)
 > or `$env:OPENCV_DART_DISABLE_AUTO_BUILD=1`(for Windows)
->
+
 > For `v1.0.4` and below, make sure run the following setup commands before running your app:
 >
 > 1. `flutter pub add opencv_dart` or `dart pub add opencv_dart`
@@ -159,6 +159,14 @@ void main() {
 
 #### Flutter
 
+> Android only
+> 
+> if you want build Android apk with custom arch , you can set `OPENCV_DART_ANDROID_SUPPORT_ARCHS` environment variable before **flutter build** 
+>
+> e.g., `export OPENCV_DART_ANDROID_SUPPORT_ARCHS=arm64-v8a,armeabi-v7a`(for Unix-like)
+> 
+> or `$env:OPENCV_DART_DISABLE_AUTO_BUILD=arm64-v8a,armeabi-v7a`(for Windows)
+
 see [example](https://github.com/rainyl/opencv_dart/tree/main/example)
 
 ~~More examples are on the way...~~see [opencv_dart.examples](https://github.com/rainyl/opencv_dart.examples) and share yours

android/build.gradle

@@ -72,6 +72,22 @@ 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']
+def OPENCV_DART_ANDROID_SUPPORT_ARCHS=System.env.OPENCV_DART_ANDROID_SUPPORT_ARCHS ?: null
+if(OPENCV_DART_ANDROID_SUPPORT_ARCHS != null){
+    println "OPENCV_DART_ANDROID_SUPPORT_ARCHS is defined : $OPENCV_DART_ANDROID_SUPPORT_ARCHS"
+    def supportedArchs = OPENCV_DART_ANDROID_SUPPORT_ARCHS.split(",")
+    def acceptedArchs = []
+    supportedArchs.each { supportArch ->
+        if(ARCHS.contains(supportArch)){
+            println "[opencv_dart] Support arch: ${supportArch}"
+            acceptedArchs.add(supportArch)
+        }else{
+            println "[opencv_dart] Unsupport arch: ${supportArch}"
+        }
+    }
+    println "[opencv_dart] OPENCV_DART for Android support arch : $acceptedArchs"
+    ARCHS = acceptedArchs
+}
 
 task downloadLibs(type: Download) {
     println "[opencv_dart] Downloading libraries..."
@@ -95,7 +111,12 @@ ARCHS.each { arch ->
     }
 }
 
-task extractLibs(dependsOn: downloadLibs) {
+task cleanupExtractLibs(type: Delete) {
+    println "[opencv_dart] Cleaning up opencv_dart libraries..."
+    delete "${SOURCE_DIR}/src/main/jniLibs"
+}
+
+task extractLibs(dependsOn: [downloadLibs,cleanupExtractLibs]) {
     println "[opencv_dart] Extracting libraries..."
     ARCHS.each { arch ->
         finalizedBy "opencv_dart_extract_libs_${arch}"