OpenJDK didn't exist in the early days of Android, so it wasn't an option. Sun/Oracle created OpenJDK, effectively "open sourcing" Java in response to the popu

OpenJDK didn't exist in the early days of Android, so it wasn't an option. Sun/Oracle created OpenJDK, effectively "open sourcing" Java in response to the popularity of clean-room Java reimplementations like GNU Classpath and Apache Harmony. Why Android did not choose to adopt OpenJDK until now, however, is a mystery known only to Google. Maybe it was just a lot of work, technically speaking, to do so.