如何在加载Android项目时调试sbt的失败"java.lang.NumberFormatException: failure :Androd-4“？

Question

我使用SBT0.12.4用Scala和java编写了一个android项目。当我试图通过sbt加载它时，我会得到一个错误：

$ sbt
[info] Loading project definition from /Users/alex/Documents/projects/android/test2/my_project/project
[error] java.lang.NumberFormatException: For input string: "android-4"
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

我搜索字符串android-4，但没有找到任何类似于它的东西。也没有其他线索。

我如何找出错误在哪里？或者说，我如何调试它？

last没有帮助：

Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore? last
[info] Loading project definition from /Users/alex/Documents/projects/android/test2/my_project/project
[debug] Running task... Cancelable: false, check cycles: false
[debug] 
[debug] Initial source changes: 
[debug]   removed:Set()
[debug]   added: Set()
[debug]   modified: Set()
[debug] Removed products: Set()
[debug] Modified external sources: Set()
[debug] Modified binary dependencies: Set()
[debug] Initial directly invalidated sources: Set()
[debug] 
[debug] Sources indirectly invalidated by:
[debug]   product: Set()
[debug]   binary dep: Set()
[debug]   external source: Set()
[debug] All initially invalidated sources: Set()
[debug] Copy resource mappings: 
[debug]   
java.lang.NumberFormatException: For input string: "android-4"
  at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
  at java.lang.Integer.parseInt(Integer.java:449)
  at java.lang.Integer.parseInt(Integer.java:499)
  at scala.collection.immutable.StringLike$class.toInt(StringLike.scala:231)
  at scala.collection.immutable.StringOps.toInt(StringOps.scala:31)
  at sbtandroid.AndroidPath$$anonfun$sbtandroid$AndroidPath$$determineBuildToolsVersion$2$$anonfun$2.apply(AndroidPath.scala:22)
  at sbtandroid.AndroidPath$$anonfun$sbtandroid$AndroidPath$$determineBuildToolsVersion$2$$anonfun$2.apply(AndroidPath.scala:22)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)
  at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:233)
  at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:34)
  at scala.collection.mutable.ArrayOps.foreach(ArrayOps.scala:38)
  at scala.collection.TraversableLike$class.map(TraversableLike.scala:233)
  at scala.collection.mutable.ArrayOps.map(ArrayOps.scala:38)
  at sbtandroid.AndroidPath$$anonfun$sbtandroid$AndroidPath$$determineBuildToolsVersion$2.apply(AndroidPath.scala:22)
  at sbtandroid.AndroidPath$$anonfun$sbtandroid$AndroidPath$$determineBuildToolsVersion$2.apply(AndroidPath.scala:18)
  at scala.collection.IndexedSeqOptimized$class.foldl(IndexedSeqOptimized.scala:52)
  at scala.collection.IndexedSeqOptimized$class.reduceLeft(IndexedSeqOptimized.scala:69)
  at scala.collection.mutable.ArrayOps.reduceLeft(ArrayOps.scala:38)
  at sbtandroid.AndroidPath$.sbtandroid$AndroidPath$$determineBuildToolsVersion(AndroidPath.scala:18)
  at sbtandroid.AndroidPath$$anonfun$settings$5.apply(AndroidPath.scala:40)
  at sbtandroid.AndroidPath$$anonfun$settings$5.apply(AndroidPath.scala:40)
  at scala.Function1$$anonfun$compose$1.apply(Function1.scala:49)
  at scala.Function1$$anonfun$compose$1.apply(Function1.scala:49)
  at sbt.EvaluateSettings$$anonfun$sbt$EvaluateSettings$$single$1.apply(INode.scala:159)
  at sbt.EvaluateSettings$$anonfun$sbt$EvaluateSettings$$single$1.apply(INode.scala:159)
  at sbt.EvaluateSettings$MixedNode.evaluate0(INode.scala:177)
  at sbt.EvaluateSettings$INode.evaluate(INode.scala:132)
  at sbt.EvaluateSettings$$anonfun$sbt$EvaluateSettings$$submitEvaluate$1.apply$mcV$sp(INode.scala:64)
  at sbt.EvaluateSettings.sbt$EvaluateSettings$$run0(INode.scala:73)
  at sbt.EvaluateSettings$$anon$3.run(INode.scala:69)
  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
  at java.lang.Thread.run(Thread.java:695)
[error] java.lang.NumberFormatException: For input string: "android-4"
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

更新：

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Answer 1

当您使用最后一次提到AndroidPath.scala:22时得到的堆栈跟踪，所以我会检查tha的源。异常的信息表明字符串android-4不是一个数字，所以在您使用的android插件中，有东西认为包含该字符串的字符串应该只包含数字。

在字符串android-4之后搜索构建配置(可能还有项目目录)，用一个数字替换它，看看这是否有帮助。

如果这没有帮助的话:看看指定行的android插件的源代码，看看它在做什么，你就可以找出它(因为我不知道你在使用哪个插件和它的版本)。还可以在调试模式下启动sbt，并在AndroidPath源中添加一个断点。