Dark clouds are hanging over Apple ’s business in China . Xiaomi Robot filed a lawsuit against the IT giant eight years ago for infringement of its patent rights for the voice assistant Siri. The company is owned by Shanghai Zhizhen Intelligent Network Technology Co. which recently filed a lawsuit with the Supreme People’s Court of China demanding Apple pay more than $1.5 billion for patent infringement. Siri software was created in 2007 and was originally used in text chats. In 2010, Siri was acquired by Apple for $200 million and has since become a personal assistant through a partnership...