Health care giant Johnson & Johnson said Tuesday that its second-quarter profit fell nearly 20 percent due to restructuring, recall and litigation costs and higher spending on overhead and research. The results still topped Wall Street expectations. The maker of Band-Aids, biologic medicines and birth control pills said its net income was $2.78 billion, or $1 per share. That’s down from $3.45 billion, or $1.23 per share, in the 2010 second quarter. Revenue rose 8.3 percent, to $16.6 billion from $15.33 billion a year ago.