Johnson, who has successfully made the transformation from wrestler to movie star, plays a helicopter pilot in the earthquake disaster film.
California famously lies on the San Andreas fault line and seismologists have been warning for years that another major earthquake is due.
While there have been smaller quakes, the last major one was in San Francisco in 1906 when thousands of people died.
Wearing a grey checked suit, white shirt and sunglasses, Johnson waved at fans before dismounting to walk down the red carpet.
The 43-year-old said the only thing that mattered was that people enjoyed his work.
"I think the key is to take everything in your stride and put out content or movies or TV shows like Ballers that people are going to enjoy, and you just want it to be quality.
"It doesn't have to be a home run, grand slam or break records - it would be nice if it does - as long as it is good quality. I think we are just going to continue to work and put out some good stuff people are going to like."
The film, which also stars True Detective's Alexandra Daddario and British actress Archie Panjabi, can be seen in UK cinemas from Thursday.
The latest statistics from the Publishing Association show that although physical book sales are slightly down, the two mediums are co-existing - with digital revenues accounting for 35% of a sector worth £4.3bn.
At The Hay Literary Festival in Wales, thousands of book lovers flock to read, discuss and dissect their favourite works.
John Boyne, the author of best-selling novel The Boy In The Striped Pyjamas, believes the digital danger has passed.
"I think the novelty of e-book has worn off, people have their Kindles, I have a Kindle and I use it when I'm travelling," he said.
"It's easier than putting books in a bag but people who like books tend to like books as a physical object, so I think the moment when e-books could have superseded books is gone."
The biggest success in the sector has been in children's literature, which has enjoyed an increase in sales of 11% overall.
Comedian and author David Baddiel is at the festival to promote his first children's book, The Parent Agency, which has been a massive hit already.
"Children really like having the tangible object of the book. It feels to me like kids think of a book especially if it's got brilliant illustrations like Jim Field has done on my book, like I used to feel when I bought a record," he said.
"It's not just about thinking 'Oh I want to read this important book so I'm going to download it on my kindle'. I want to have the thing; it's like a badge of identity."
It is by no means an easy time for the physical book and the challenge has been finding new ways to keep people engaged.
Alexander McCall Smith, who has just won the Bollinger Everyman Woodhouse prize for Fatty O'Leary's Dinner Party, says the novel is here to stay.
"I'm rather optimistic about the state of the novel," he said.
"I think the book club has done an immense amount for reading - the fact that people are discovering the joy of reading a book with six or seven other people in their book club and discussing it. I'm sure that had a major effect on keeping the novel alive."
Peter Florence started the Hay Festival 28 years ago and believes the future for publishing is exciting.
"Somebody will be telling stories (and) what format they use is up in the air, it's up for grabs, it's an amazing opportunity," he said.
"But this (the book) could last for another 200 years, it's a beautiful piece of work."
The Hay Literary Festival is on until 31 May.
The 83-year-old actor's agent Steve Kenis confirmed the news to the Associated Press after his son Tarek Sharif revealed the diagnosis in an interview with a Spanish newspaper on 23 May.
No details about his condition or care have been given.
Egyptian-born Sharif rose to international stardom with his role in the 1962 epic Lawrence Of Arabia - his first English-language film.
He earned an Oscar nomination for his turn as Sherif Ali in David Lean's iconic film opposite Peter O'Toole.
Sharif followed the breakthrough performance with the title role in Lean's Doctor Zhivago, co-starring Julie Christie.
He then played Fanny Brice's husband, Nicky Arnstein, in Funny Girl alongside Barbra Streisand.
His last completed feature film credits were in 2013.
The Shake It Off singer, who is among the most popular celebrities on Twitter with 58 million followers, is a new entry at 64 in the Forbes Power Women List.
At the age of 25, she is the youngest person on a list topped by Angela Merkel for the fifth time in a row.
Presidential candidate Hillary Clinton climbs from sixth to second in this year's list, while Melinda Gates, co-chairman of the Bill and Melinda Gates Foundation with her husband, remains in third.
Both have been on the list since it began in 2004, along with the Queen, who drops six places to 41 but retains her status as the oldest entry at 89-years-old.
The 19 newcomers also include Bank of England deputy governor Nemat Shafik (66) and the new Guardian editor-in-chief Katharine Viner (80).
They join Her Majesty as the UK's three representatives.
Facebook's second-in command Sheryl Sandberg, whose husband David Goldberg died in May while on holiday in Mexico, makes the list at number nine, one ahead of First Lady Michelle Obama.
One woman to fall off the list this year is pop singer Lady Gaga.
There are 15 billionaires, eight heads of state and 24 CEOs in the 100.
Combined, the women control nearly $1tn (£649bn) in annual revenues and have 474 million followers on Twitter and YouTube.
Forbes applies four metrics - money, media, impact and spheres of influence - in deciding who gets on the list.
The top 15 is:
1. Angela Merkel, German Chancellor
2. Hillary Clinton, US presidential candidate
3. Melinda Gates, co-chair of the Bill and Melinda Gates Foundation
4. Janet Yellen, US Federal Reserve Bank chair
5. Mary Barra, CEO, General Motors
6. Christine Lagarde, MD of International Monetary Fund
7. Dilma Rousseff, President of Brazil
8. Sheryl Sandberg, COO, Facebook
9. Susan Wojcicki, CEO, YouTube
10. Michelle Obama, US First Lady
11. Park Geun-hye, President of South Korea
12. Oprah Winfrey, media mogul
13. Virginia Rometty CEO, IBM
14. Meg Whitman, CEO, HP
15. Indra Nooyi CEO, PepsiCo
The New York-born star was known for her opposites-attract comedy routine with husband Jerry Stiller.
Her family said she died at the weekend but no details about the circumstances were given.
A statement said: "She is survived by her husband and partner in life Jerry Stiller. The two were married for 61 years and worked together almost as long."
In a tweet on Monday, Ben Stiller wrote: "Thank you so much for all the kind words about Anne. All of us in our family feel so lucky to have had her in our lives."
Meara and Stiller, who met in 1953 at an agent's office and married a few months later, worked together in the Compass Players comedy troupe, a precursor to the Second City organisation, before forming their own duo.
By the 1960s, they had become a popular comedy duo on American television, making 36 appearances on The Ed Sullivan Show.
Their act included skits such as an interview with the biblical Jonah after his encounter with the whale and parodies of TV commercials.
Much of their humour was marriage-based and focused on height - Stiller was 5ft 4 (1.62m), Meara was taller - and ethnicity - he was Jewish, she was of Irish heritage.
"Our marriage has lasted because we have the same feelings of insecurity about being an actor. We needed stability," Stiller told the New York Daily News in 2012.
In the early 1970s, the pair began working separately.
She made the movies The Out-Of-Towners and Lovers And Other Strangers and had a one-year run starring on the television show Kate McShane.
She also appeared on television shows The King Of Queens and Sex And The City.
She is also survived by daughter Amy, son Ben, and her grandchildren.