code: private void loadSDKToolsMajorVersion()
      {
          File propFile = new File( sdkPath, "tools/" + SOURCE_PROPERTIES_FILENAME );
          Properties properties = new Properties();
          try
          {
              properties.load( new FileInputStream( propFile ) );
          }
          catch ( IOException e )
          {
              throw new InvalidSdkException( "Error reading " + propFile.getAbsoluteFile() );
          }
  
          if ( properties.containsKey( SDK_TOOLS_REVISION_PROPERTY ) )
          {
              try
              {
                  String versionString = properties.getProperty( SDK_TOOLS_REVISION_PROPERTY );
                  String majorVersion;
                  if ( versionString.matches( ".*[\\.| ].*" ) )
                  {
                      String[] versions = versionString.split( "[\\.| ]" );
                      majorVersion = versions[ 0 ];
                  }
                  else
                  {
                      majorVersion = versionString;
                  }
                  sdkMajorVersion = Integer.parseInt( majorVersion );
              }
              catch ( NumberFormatException e )
              {
                  throw new InvalidSdkException( "Error - The property '" + SDK_TOOLS_REVISION_PROPERTY
                          + "' in the SDK source.properties file  number is not an Integer: "
                          + properties.getProperty( SDK_TOOLS_REVISION_PROPERTY ) );
              }
          }
      }
docs: Loads the SDK Tools version