Build UiAutomator 2.0 from command line

I want to build, install and run the tests of a UiAutomator project through the command line.

In the previous version I was doing:

android create uitest-project -n <project_name> -p <project_path> -t <target_id>
ant build

to build and then

adb push <jar_path> /data/local/tmp

to install and finally

adb shell uiautomator runtest <jar_name> -c <main_class>

However, right now I'm stuck in the building part.

The result is

-check-env:
  [checkenv] Android SDK Tools Revision 24.1.2                                    
  [checkenv] Installed at C:\Android                                                                                                                             
-build-setup:                                                                   
[getbuildtools] Using latest Build Tools: 22.0.0                                     
    [echo] Resolving Build Target for AndroidExplorerTester...                 
[getuitarget] Project Target:   Android 5.0.1                                   
[getuitarget] API level:        21                                                   
    [echo] ----------                                                               
    [echo] Creating output directories if needed...                                                                                                            
-pre-compile:                                                                                                                                                   
compile:                                                                                                                                                        
-post-compile:                                                                                                                                                  
-dex:                                                                                 
    [dex] input: <test_path>\bin\classes                                                                          
    [dex] Converting compiled files and external libraries into <test_path>\bin\classes.dex...
     [dx] no classfiles specified                                                                                                                             
BUILD FAILED                                                                    
C:\Android\tools\ant\uibuild.xml:198: null returned: 1                                                                                                          
Total time: 1 second             

I don't know if there is a better way to do it now since the new version of UiAutomator.

Note: I don't know if it matters but I was using Eclipse before and now I'm using IntelliJ (Android Studio if you prefer lol)