Use SAM

build.sbt

@@ -12,7 +12,7 @@ compileOrder in Compile := CompileOrder.JavaThenScala
 
 javacOptions ++= Seq("-source", "1.6", "-target", "1.6")
 
-scalacOptions += "-target:jvm-1.6"
+scalacOptions ++= Seq("-target:jvm-1.6", "-Xexperimental")
 
 ndkJavah in Android := List()
 

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -953,11 +953,7 @@ class Shadowsocks
 
     new AlertDialog.Builder(this)
       .setCancelable(true)
-      .setNegativeButton(getString(R.string.close), new DialogInterface.OnClickListener() {
-      override def onClick(dialog: DialogInterface, id: Int) {
-        dialog.cancel()
-      }
-    })
+      .setNegativeButton(getString(R.string.close), (dialog: DialogInterface, id: Int) => dialog.cancel())
       .setView(image)
       .create()
       .show()