As described in the Android documentation, the SDK level (integer) the phone is running is available in:

android.os.Build.VERSION.SDK_INT

The class corresponding to this int is in the android.os.Build.VERSION_CODES class.

Code example:

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP){    // Do something for lollipop and above versions} else{    // do something for phones running an SDK before lollipop}

Edit: This SDK_INT is available since Donut (android 1.6 / API4) so make sure your application is not retro-compatible with Cupcake (android 1.5 / API3) when you use it or your application will crash (thanks to Programmer Bruce for the precision).

Corresponding android documentation is here and here

Very easy:

   String manufacturer = Build.MANUFACTURER;   String model = Build.MODEL;   int version = Build.VERSION.SDK_INT;   String versionRelease = Build.VERSION.RELEASE;Log.e("MyActivity", "manufacturer " + manufacturer            + " \n model " + model            + " \n version " + version            + " \n versionRelease " + versionRelease    );

Output:

E/MyActivity:   manufacturer ManufacturerX                model SM-T310                 version 19                 versionRelease 4.4.2

Build.VERSION.RELEASE;

That will give you the actual numbers of your version; aka 2.3.3 or 2.2.The problem with using Build.VERSION.SDK_INT is if you have a rooted phone or custom rom, you could have a non standard OS (aka my android is running 2.3.5) and that will return a null when using Build.VERSION.SDK_INT so Build.VERSION.RELEASE will work no matter using standard Android version or not !

To use it, you could just do this;

String androidOS = Build.VERSION.RELEASE;