Basecamp has a native Android app now! Fantastic… big part of what we use at Harrelson Agency to do what we do.
Basecamp for Android was designed from the ground up to work great, look sharp, and take advantage of the capabilities of your recent Android phone and tablet. Create new projects on the go. Open links directly in the app. Jump to any project from a shortcut on your home screen. You can attach or save Basecamp files in Dropbox, Google Drive or wherever you store them. You can even start a new message with text you wrote in another app. Basecamp works the way you do on Android.