How to detect system information like os or device type

Question

The most important things I want to know are the device type, the OS version, if it has a hardware keyboard and maybe the screen resolution. but if you know other useful deb

Answer 1

For screen resolution:

getWindow().getWindowManager().getDefaultDisplay().getWidth();
getWindow().getWindowManager().getDefaultDisplay().getHeight();

For hardware keyboard presence:

boolean keyboardPresent = (getResources().getConfiguration().keyboard != Configuration.KEYBOARD_NOKEYS);