src/main/java/com/simpligility/maven/plugins/android/AndroidSdk.java
public String getMainDexClassesRulesPath()
    {
        File mainDexClassesRules = new File( getBuildToolInfo().getLocation(),
                "mainDexClasses.rules" );
        if ( mainDexClassesRules.exists() ) 
        {
            return mainDexClassesRules.getAbsolutePath();
        }
        throw new InvalidSdkException( "Cannot find " + mainDexClassesRules );
    }
public String getMainDexClassesRulesPath()
    {
        File mainDexClassesRules = new File( getBuildToolInfo().getLocation(),
                "mainDexClasses.rules" );
        if ( mainDexClassesRules.exists() ) 
        {
            return mainDexClassesRules.getAbsolutePath();
        }
        throw new InvalidSdkException( "Cannot find " + mainDexClassesRules );
    }
Get the path for mainDexClasses.rules
@return