Are the 4 Android buttons standard? Ex. back button, menu button

Question

Are the physical buttons that Android phones come with standard? Specifically the back, menu, home, and search button? In my applications I assume everyone has a back button

Answer 1

The CDD describes what is required to be compatible:

http://source.android.com/compatibility/index.html

(See "Current CDD" on the left)

In this case:

7.2.3. Navigation keys

The Home, Menu and Back functions are essential to the Android navigation paradigm. Device implementations MUST make these functions available to the user at all times when running applications. These functions MAY be implemented via dedicated physical buttons (such as mechanical or capacitive touch buttons), or MAY be implemented using dedicated software keys, gestures, touch panel, etc.Android 4.1 supports both implementations