Xi urged the multi-billionaire to "continue to play an active role in promoting China-US economic and trade cooperation", the official Xinhua news agency said.
'There is never a justification for violence. No excuses, no exceptions: America is a nation of laws,' he said.
The ministry did not specify if the signal was detected from the downed plane's black box.
The Sriwijaya Air Boeing 737-500 plunged into a steep dive about four minutes after it left Soekarno-Hatta international airport in Jakarta on Saturday afternoon.
'One of the few things he and I have ever agreed on,' Biden said. 'It's a good thing, him not showing up.'
The blazes that have engulfed parts of the world's largest rainforest -- which is crucial for maintaining a stable global climate -- have also sparked a diplomatic spat between Brazil and Europe that threatens to torpedo a major trade deal.
The fires in the world's largest rainforest have triggered a global uproar, and are a major topic of concern at the G7 meeting in Biarritz in southern France.
France's President Emmanuel Macron said the wildfires were "an international crisis" and called on the globe's most industrialized nations to address it at their summit this weekend.
The representative has criticized Trump's attacks on ethnic minority lawmakers as "unbecoming of the leader of the free world."
Pakistan has a chequered aviation safety record, with frequent plane and helicopter crashes over the years.
