While there are plenty of iPad apps and web apps for creating flipped lesson videos, it is difficult to find good Android apps for the same purpose. If you're an Android user, take a look at this pair of apps.
Clarisketch is a free Android app that has great potential for classroom use. The app allows you to take a picture or pull one from your device’s camera roll and then add your voice to it. While you are talking about your picture you can draw on it to highlight sections of it. Completed projects are shared as links to the video file hosted on Clarisketch. You can share the link to your Clarisketch video and have it play on nearly any device that has a web browser. See my sample here.
my workshops for a couple of years. WeVideo's Android app allows you to create and edit videos on your tablet or phone. If you're looking to create a slide-by-slide instructional video in which you or your students talk about what's happening on the screen, then WeVideo could be a good choice for you. Wes Fryer recently wrote a great post about his experience with the app. In that same post Wes also did a nice job of comparing it to some similar iOS apps.