Sunday's protest had taken place in Bern's centre and was scheduled by police to end at noon, before Mr Xi's visit.
City authorities said the demonstration mostly proceeded peacefully but a number of participants had continued to protest past the deadline, refused identity checks, and caused other disruptions.
Police spokesman Christoph Gnaegi told the Associated Press that those arrested were later released.
Doctors had taken care of the man who had tried to set himself on fire.
The demonstration attracted between 700 and 800 protesters, organisers said.

China's policies in Tibet have frequently prompted overseas protests by Tibetans calling for freedom from China and acceptance of their spiritual leader-in-exile the Dalai Lama.
In 1999, a similar pro-Tibet protest took place during a visit by China's then-president Jiang Zemin, who was said to be angered when demonstrators threw eggs at the Chinese delegation.

Low income developing countries have experienced incomplete adjustment to the new world of "lower for long" commodities prices, with many commodity exporters still far from a sustainable macroeconomic trajectory, said the IMF in its latest report.

According to its research, the IMF found that, with the sharp adjustments of commodity prices into its third year, many commodity exporters remained under significant economic stress, with sluggish growth, large fiscal imbalances, and weakened foreign reserve positions.

The average output growth of the fuel exporters dropped to -1.6 percent by 2016 from 5.7 percent in 2014; the non-fuel commodity exporters experienced much milder growth shock with its average growth slowing to 3.8 percent by 2016 from 5.3 percent in 2014; while diversified exporters have mainly benefited from the adjustment of commodity prices, with growth running at 6 percent or above in many countries.

In face of the sluggish growth, two thirds of the commodities exporters were facing high macroeconomic vulnerabilities, said the IMF.

It estimated that more than half of commodities exporters were facing an elevated risk of financial sector stress over the next 18 months, which could result in bank failures and supervisory interventions, and one quarter of low income countries are currently assessed to be at high risk of external debt distress.

IMF called on low income countries to strengthen financial sector supervision, improve fiscal risk management and promote infrastructure investment to increase productivity.