How can you detect if the device is rooted in the app? [duplicate]

Answer 1

you could try to do

Process proc = Runtime.getRuntime ().exec ( "su" );

if that throws an exception or proc is null then they don't have root

Answer 2

At the end of the day, you can't. A rooted device may be modified in any way, and thus can completely hide whatever it wants from you. In practice you could look at some of the standard root builds to find features they have or characteristics you can look at... but there is no way to guarantee that whatever you do will actually detect a "rooted" device.