The master is running Windows, and I have two slaves (one Linux and one Mac OSX) running builds.

Windows master, 2 Ubuntu slaves.

I rebuilt with some ugly temporary fix just to get going.
If you are interested until a proper fix is out, here they are:
https://github.com/cowst/android-emulator-plugin/tree/slash-workaround

Sorry for the delay everyone.

I'll get my hands on a Windows machine this week and get this fixed.

The same here with the latest Jenkins LTS version 1.580.1 and android-emulator-plugin version 2.12.
It was fine with the previous version of android-emulator-plugin 2.10 and Jenkins LTS 1.565.1.
The master is a windows and the slave is OS X.

> git clean -fdx # timeout=10
$ /opt/dailybuild/android/sdk\tools\android list target
FATAL: Cannot run program "/opt/dailybuild/android/sdk\tools\android": error=2, No such file or directory
java.io.IOException: Cannot run program "/opt/dailybuild/android/sdk\tools\android": error=2, No such file or directory

Also, adb -s emulator-5834 shell getprop dev.bootcomplete does not work on OSX.
It works only with adb connect localhost:5834

So I did a terrible job of reviewing the code that caused this bug, and a terrible job of fixing it so far.

I've been working on some other fixes and will do a release soon. So I will merge and test this pull request which should fix this issue: https://github.com/jenkinsci/android-emulator-plugin/pull/44

Code changed in jenkins
User: Dave Brown
Path:
src/main/java/hudson/plugins/android_emulator/sdk/DefaultToolLocator.java
src/main/java/hudson/plugins/android_emulator/sdk/PlatformToolLocator.java
http://jenkins-ci.org/commit/android-emulator-plugin/28f76bb7acfd96a16a1eb5626b2527ad9b96856f
Log:
JENKINS-23134 Replace File.separator with "/".

When using this plugin on a Windows master delegating to a Unix slave
File.separator resolves to "
" resulting in erroneous paths.

Signed-off-by: Dave Brown <d.brown@bigdavedev.com>

Code changed in jenkins
User: Christopher Orr
Path:
src/main/java/hudson/plugins/android_emulator/sdk/DefaultToolLocator.java
src/main/java/hudson/plugins/android_emulator/sdk/PlatformToolLocator.java
http://jenkins-ci.org/commit/android-emulator-plugin/98d2a53130cb7165b80e08b2496822ec20bbda68
Log:
Merge pull request #44 from bigdavedev/master

[FIXED JENKINS-23134] Replace File.separator with "/".

Fixes inability to launch Android tools on Unix slaves from a Windows master.

Compare: https://github.com/jenkinsci/android-emulator-plugin/compare/a0589ce14556...98d2a53130cb

Version 2.13 of the plugin has been released, which includes this fix.