Now that he no longer has the authority that came with being president, Mr. Obama said he relies on persuasion rather than legislation.
“A lot of the things that still motivate me and move me continue to this day,” he added.
Addressing Trump, obliquely
While neither man mentioned Mr. Trump directly, they discussed the role of social media in leadership, a conversation that brought to mind Mr. Trump’s blunt, unvarnished posts on Twitter.
Mr. Obama warned against the irresponsible use of social media by people in positions of power and expressed his concern about a future in which facts were discarded.
“One of the dangers of the internet is that people can have entirely different realities. They can be cocooned in information that reinforces their current biases.”
“The question has to do with how do we harness this technology in a way that allows a multiplicity of voices, allows a diversity of views, but doesn’t lead to a Balkanization of society and allows ways of finding common ground.”
Mr. Obama also mentioned that he had developed a thick skin during his presidency. Mr. Trump, in contrast, has been criticized since the 2016 campaign as thin-skinned and unable to rise above provocation.
Passing the baton
During the presidential inauguration on Jan. 20, many people — including Prince Harry — wondered what Mr. Obama was thinking as he sat in the crowd, showing little emotion.
“The first thing that went through my mind was sitting across from Michelle, how thankful I was that she had been my partner through that whole process,” he said in a reflective tone.
Looking back, he said he felt a sense of completion as he handed over power to Mr. Trump. There was a “satisfying feeling that was mixed with all the work that was still undone,” he said, adding that he had “ concerns about how the country moved forward.”
“But over all, there was serenity there,” he said.
Working with the prince
Mr. Obama and Prince Harry have a range of shared interests, and since meeting in London last year, they have been discussing ways in which they can work together to provide a platform to empower young people.
“How do we make it a reality?” Prince Harry asked in the interview.
Mr. Obama used his 2008 presidential campaign as an example.
“You have this African-American, mixed race, born in Hawaii, named Barack Hussein Obama and somehow he becomes president.
“How did that happen? Well it happened primarily because you had a bunch of 20-year-olds and 23-year-olds and 25-year-olds who started going out into communities that oftentimes they’d never been in before and believed in the possibilities of a different kind of politics.”
The campaign was fueled by a grass-roots approach that was brought together by new technologies of the time, Mr. Obama added.
Prince Harry’s wedding
Prince Harry’s engagement to the American actress Megan Markle was announced in November, long after the interview was recorded, so it obviously did not come up during the conversation with Mr. Obama.
It did come up as part of Prince Harry’s role as guest editor, however, and there was an Obama angle. British tabloids, citing unidentified sources, reported this week that senior government officials were putting pressure on Prince Harry to leave the Obamas off the guest list, out of fear that a snub would enrage Mr. Trump.
Asked about the issue by a Radio 4 host on Wednesday, Prince Harry sidestepped the question, saying that he and Ms. Markle were yet to work out who would be invited to their wedding, which is set for May 19.