He started his career in Statyba Vilnius. Later he moved to Žalgiris Kaunas and became champion of the Euroleague. After the successful season in Žalgiris Kaunas he moved to Zucchetti Montecatini, but he did not fit there. Therefore, he moved to Anwil Włocławek, and later to Śląsk Wrocław and finally in 2003 he arrived to BCM Gravelines. He became the captain of this team just a year later. Nevertheless, at the end of 2006–2007 season during the change of coaches, he left to Barons LMT. In August 2009 he announced the end of his career.

Note: The EuroLeague is not the only competition in which the player participated for the team during the season. He also played in domestic competition, and regional competition if applicable.

Since August 22, 2009, he is an assistant coach at Czarni Słupsk. Since March 23, 2010 head coach of this team. In June 2012 he signed with Anwil Włocławek, but he was fired the same year because of bad results. On November 19, 2012, he joined Lietuvos Rytas as assistant coach of Darius Maskoliunas.

Adomaitis was a member of the Lithuanian national team which won bronze medals at the 2000 Olympic Games. In 2016 he was elected to be a coach for a Lithuanian national team.

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