Android SDK is an application development environment for the Android operating system. A Android application can be created and tested by accessing Bluetooth, Wi-Fi and the sensors built into Android devices as well as accelerometer, compass and GPS signals via the program.It includes Fi and EDGE as well as 3G. (audio, video, video codec 4: H. rt, support for multimedia content (audio, video, MPEG4, H. rt)264, MP3, AAC, AMR, JPG, PNG and GIF images), SQLite database, integrated WebKit browser, Dalvik virtual machine, GSM telephony, etc. Also Android SDK users have the opportunity to test their applications with the help of the built-in emulator.