如何动态地使用Gradle将文件从aar中排除？

Question

我有一个包含本地代码的Android库（aar），编译模块时会一起构建：

apply plugin: 'com.android.library'

android {
  compileSdkVersion 16
  buildToolsVersion "25.0.0"

  defaultConfig {
    minSdkVersion 11
    targetSdkVersion 16
    versionCode 1
    versionName "1.0"

    ndk {
      abiFilters 'armeabi-v7a'
    }
  }

  externalNativeBuild {
    ndkBuild {
      path 'jni/Android.mk'
    }
  }

  sourceSets {
    main {
      manifest.srcFile 'AndroidManifest.xml'
      java.srcDirs = ['src']
      res.srcDirs = ['res']
      jni.srcDirs = ['jni']
    }
  }

  packagingOptions {
    exclude '/lib/armeabi-v7a/libv8.cr.so'
    exclude '/lib/armeabi-v7a/libv8_libbase.cr.so'
     // TODO : generate dynamically from `SHARED_V8_LIB_FILENAMES`
  }
}

我已经修改了Android.mk文件，使其根据SHARED_V8_LIB_FILENAMES环境变量拥有不同的配置：

...
# Report configuration
ifeq ($(SHARED_V8_LIB_FILENAMES),)
# static
$(info [Configuration] Linking statically with built-in v8)
else
# dynamic

define info_define
    $(info [Configuration] Linking dynamically with shared v8 library ./libfoo-binaries/android_$(TARGET_ARCH_ABI)/$1)
endef
$(foreach item,$(SHARED_V8_LIB_FILENAMES),$(eval $(call info_define,$(item))))
endif
...

如何修改build.gradle文件以依赖于环境变量SHARED_V8_LIB_FILENAMES生成packageOptions部分？我需要检查变量是否设置，使用空格分隔解析它，并将文件列表添加到最终的aar文件中以从中排除。

- 4ntoine

Answer 1

实际上，我自己就能做到：

apply plugin: 'com.android.library'

android {
  compileSdkVersion 16
  buildToolsVersion "25.0.0"

  defaultConfig {
    minSdkVersion 11
    targetSdkVersion 16
    versionCode 1
    versionName "1.0"

    ndk {
      abiFilters 'armeabi-v7a'
    }
  }

  externalNativeBuild {
    ndkBuild {
      path 'jni/Android.mk'
    }
  }

  sourceSets {
    main {
      manifest.srcFile 'AndroidManifest.xml'
      java.srcDirs = ['src']
      res.srcDirs = ['res']
      jni.srcDirs = ['jni']
    }
  }

  def sharedV8LibFilesSet = []
  def sharedV8LibFiles = System.getenv('SHARED_V8_LIB_FILENAMES')
  if (sharedV8LibFiles != null) {
    def sharedV8LibFilesArray = sharedV8LibFiles.split(' ')
    sharedV8LibFilesArray.each { eachFileName ->
      sharedV8LibFilesSet.add("**/" + eachFileName)
      println "[Configuration] Excluding shared v8 library " + eachFileName + " from AAR"
    }
  } else {
    println "[Configuration] No shared v8 libraries excluded from AAR"
  }

  packagingOptions {
    excludes = sharedV8LibFilesSet
  }
}

欢迎提出任何代码风格的更改/改进建议。

- 4ntoine