android - 类路径资源被(可能)sbt 复制

Question

我正在尝试使用 sbt 和 jberkel/android-plugin 在 Scala 和 Akka 中设置简单的 Android 项目.我成功地基于 getting started tutorial of android-plugin 创建了简单的应用程序.我还设法组装了 ProGuard 配置，这使我能够将 Akka 混合到项目中。

现在我想添加Akka配置文件，但我做不到。我在 src/main/resources 文件夹中创建了它，并希望它能正常工作。不幸的是，在 APK 组装过程中，sbt 失败并出现以下错误:

[trace] Stack trace suppressed: run last Akkdroid/android:package-debug for the full output.
[error] (Akkdroid/android:package-debug) 
[error] Using keystore: /home/ghik/.android/debug.keystore
[error] Packaging akkdroid-0.1.apk
[error] /data/Studia/S10/Mobilne/akkdroid/target/resources.apk:
[error] => res/layout/main.xml
[error] => AndroidManifest.xml
[error] => resources.arsc
[error] /data/Studia/S10/Mobilne/akkdroid/target/classes.dex => classes.dex
[error] /data/Studia/S10/Mobilne/akkdroid/target/classes.min.jar:
[error] => akkdroid.conf
[error] => library.properties
[error] => reference.conf
[error] => org/jboss/netty/container/spring/beans.xml
[error] /data/Studia/S10/Mobilne/akkdroid/src/main/resources/akkdroid.conf => akkdroid.conf
[error] 
[error] Error packaging /data/Studia/S10/Mobilne/akkdroid/target/akkdroid-0.1.apk: Duplicate files at the same path inside the APK
[error] Total time: 20 s, completed 2013-04-24 20:32:47

从这些消息中，我推断我的 akkdroid.conf 文件首先被复制(通过 ProGuard？)到 classes.min.jar 中，然后是 sbt 尝试构建包，包括来自 classes.min.jar 和 src/main/resources 的资源，它最终看到我的文件两次。

不幸的是，我不知道为什么会发生这种情况以及如何解决它。

如果有帮助，这是我的 sbt 构建文件(主要由 jberkel's template 生成):

import sbt._

import Keys._
import AndroidKeys._

object General {
  val settings = Defaults.defaultSettings ++ Seq(
    name := "Akkdroid",
    version := "0.1",
    versionCode := 0,
    scalaVersion := "2.10.1",
    platformName in Android := "android-10",
    javacOptions ++= Seq("-source", "1.6", "-target", "1.6")
  )

  val proguardSettings = Seq(
    useProguard in Android := true,
    proguardOption in Android :=
      """-keepclassmembers class * {
        |  ** MODULE$;
        | }
        |-keep public class akka.actor.LocalActorRefProvider {
        |public <init>(...);
        |}
        |-keep public class akka.remote.RemoteActorRefProvider {
        |public <init>(...);
        |}
        |-keep class akka.actor.SerializedActorRef {
        |*;
        |}
        |-keep class akka.remote.netty.NettyRemoteTransport {
        |*;
        |}
        |-keep class akka.serialization.JavaSerializer {
        |*;
        |}
        |-keep class akka.serialization.ProtobufSerializer {
        |*;
        |}
        |-keep class com.google.protobuf.GeneratedMessage {
        |*;
        |}
        |-keep class akka.event.Logging*
        |-keep class akka.event.Logging$LogExt{
        |*;
        |}
        |-keep class scala.Option
        |-keep class scala.Function1
        |-keep class scala.PartialFunction
        |-keep class scala.collection.SeqLike {
        |public protected *;
        |}
        |-keep class akka.**
        |-keepclassmembers class akka.**
        |-keep class org.omg.**
        |-keep class scala.Tuple2
        |-dontskipnonpubliclibraryclassmembers
        |-dontskipnonpubliclibraryclasses
      """.stripMargin
  )

  lazy val fullAndroidSettings =
    General.settings ++
      AndroidProject.androidSettings ++
      TypedResources.settings ++
      proguardSettings ++
      AndroidManifestGenerator.settings ++
      AndroidMarketPublish.settings ++ Seq(
      keyalias in Android := "change-me",
      libraryDependencies += "org.scalatest" %% "scalatest" % "1.9.1" % "test"
    )
}

object AndroidBuild extends Build {
  javacOptions ++= Seq("-target", "1.6")

  lazy val main = Project(
    "Akkdroid",
    file("."),
    settings = General.fullAndroidSettings ++ Seq(
      libraryDependencies += "com.typesafe.akka" % "akka-actor_2.10" % "2.1.2",
      libraryDependencies += "com.typesafe.akka" % "akka-remote_2.10" % "2.1.2"
    )
  )

  lazy val tests = Project(
    "tests",
    file("tests"),
    settings = General.settings ++
      AndroidTest.androidSettings ++
      General.proguardSettings ++ Seq(
      name := "AkkdroidTests"
    )
  ) dependsOn main
}

如果能提供一些帮助，我将不胜感激。我几乎没有 Android 或 SBT 方面的经验。

Answer 1

我遇到了同样的问题。我不知道这是否是最好的处理方式，但我把我的配置文件放在android项目的raw目录下。然后我将其解析为 Config对象并将其传递给 ActorSystem 构造函数。

object AkkaSystem {
  private var systemOption: Option[ActorSystem] = None

  def system(implicit context: Context): ActorSystem = synchronized {
    systemOption match {
      case None =>
        val reader = new InputStreamReader(
          context.getResources.openRawResource(R.raw.configuration)
        )
        systemOption = Option (
          ActorSystem("MySystem", ConfigFactory.parseReader(reader))
        )
        reader.close()
        systemOption.get
      case Some(existingSystem) => existingSystem
    }
  }
}

然后在我的 Activity 类中，我可以使用那个 AkkaSystem 对象来获取配置的 ActorSystem:

class MainActivity extends Activity {
  implicit val context = this

  private def mainActor = AkkaSystem.system.actorOf(Props[MainActor], "main")
}

我同意，如果我可以避免所有这些代码以及传递 Context 以获得 Android 资源的需要，那会更好。