Apple AirPlay technology lets you wirelessly stream audio, video and photos from iOS devices including iPhone, iPod Touch and iPad. Officially with the latest iOS update Apple treats multimedia iOS devices and Mac OS (running iTunes) as AirPlay sender while Apple Airport Express and Apple TV can act as AirPlay receivers. So if you want to make use of AirPlay protocol to wirelessly stream music from iPhone or iPad to Android device, emulating either of AirPlay receiver hardware is a must. Here is an Android app that emulates Apple Airport Express.
AirBubble is a free Android app that lets you stream music from iOS devices like iPhone, iPod Touch or iPad, Mac OS and Windows OS (with Shairport4w). AirBubble emulates an Airport Express hardware to play streaming music from an AirPlay client over a WiFi network. Once after installing AirBubble on Android phone or Tablet device, and providing a network name the device will appear as a network speaker that supports AirPlay under iOS devices or iTunes AirPlay list. Now select your Android phone for streaming audio from iPhone or iPad to Android device. On AirBubble Android app you can mute and un-mute audio streams along with few other options including automatically running the app as a background service while booting.
AirBubble works on Android 2.2 Froyo and above. That means Android Honeycomb tablets can also be set as a portable wireless speaker for iOS device or your Macbook. This app is in beta testing mode and not available on Android Marketplace. Allow installation of non-market applications to download and install AirBubble .apk file (link below).
Video of AirBubble streaming audio from Mac AirPlay client (iTunes):
Download AirBubble for Android (.apk)
Source: XDA Developers