With tears rolling down his face, Warner apologised for his part in the cheating and vowed to earn the public's respect again.
He said he now understood that he needed to make changes in his life, and he would be seeking help with that.
An inquiry by Cricket Australia found that Warner came up with the plan to tamper with the ball and then instructed a junior player, Cameron Bancroft, in how he went about it.
Warner said he took full responsibility for his actions, but refused to answer questions about whether other players were involved.
Warner has been banned from test cricket for a year, and he said he realised he may not play cricket for Australia again.