This is from the documentation on Wowza's website:
Android: Most Android devices support RTSP/RTP streaming. Newer Android devices that are running version 2.2 (Froyo) or later also support Adobe Flash player 10.1 and can play RTMP and Adobe HDS streams. Android devices can't play MP3 streams over RTSP/RTP in any combination (audio/video or audio only). Android devices that support Flash player 10.1 can play MP3 using RTMP or Adobe HDS. When streaming to an Android device using RTSP/RTP, the RTP portion must flow over UDP. Android doesn't support RTSP/RTP interleaved (RTP over TCP). This means that if UDP is unavailable for RTP playback, RTP over TCP won't work as a failover and your stream won't play.
It is recommended to use RTSP when streaming to Android to reach the greatest number of clients (regardless of device) trying to view the stream.