Whose sphere of influence included the island of Hainan?

The island of Hainan was historically influenced by several powers, but during the late 19th and early 20th centuries, it primarily fell under the sphere of influence of France. Following the Sino-French War (1884-1885), France gained control over Hainan as part of its colonial ambitions in Southeast Asia. Later, in the 20th century, the island became part of the broader Chinese territory and governance.