Even after he did so, his opinion didn't change. He knew he belonged at IU.
"After I came off my official, I felt really strong about it," Johnson said Friday. "I kind of wanted to commit right there, but my parents thought it'd be best if I took a couple other visits to have something to compare it to.
"I think they've been recruiting me the hardest. The thing [Indiana coach Tom Crean] always talks about is they made me a priority from day one. As far as me having the chance to play at the next level, he talked a lot about how he would do that, developmental wise. I think that would be the best situation."
Johnson said he "pretty much knew" the whole week that he would choose Indiana. He called Crean to tell him before Friday's press conference, but the Hoosiers' coach was in workouts with his current players. Johnson and Crean later connected after the press conference.
"He was doing what he does best," Johnson said. "He definitely said there's an opportunity there. He didn't promise me anything, but he said there's an opportunity there and if I do everything I'm capable of, there will definitely be an opportunity to play."
Now that Johnson is committed, he plans to turn his role from recruit to recruiter. Johnson is Indiana's first and only commit in the 2014 class.
"I'm gonna go out and try to recruit some other players to come along with me," Johnson said. "At the end of the day you want the team to be as strong as possible so we can do as much damage as we can."
Any particular players in mind?
"Oh yeah, Devin Robinson," Johnson said of the 2014 forward. "I'm going after him first.
"I talked to him today. He was trying to squeeze it out of me a little bit early today, but I didn't let that happen. I'll probably call him after this."
Robinson, a 6-foot-8 forward, lives in the same neighborhood as Johnson and the two have been close friends for years. Robinson is scheduled to take an official visit to Indiana for Hoosier Hysteria on Oct. 4.