public static boolean isRooted(Context context) {
// No reliable way to determine if an android phone is rooted, since a rooted phone could
// always disguise itself as non-rooted. Some common approaches can be found on SO:
// http://stackoverflow.com/questions/1101380/determine-if-running-on-a-rooted-device
//
// http://stackoverflow.com/questions/3576989/how-can-you-detect-if-the-device-is-rooted-in-the-app
//
// http://stackoverflow.com/questions/7727021/how-can-androids-copy-protection-check-if-the-device-is-rooted
final boolean isEmulator = isEmulator(context);
final String buildTags = Build.TAGS;
if (!isEmulator && buildTags != null && buildTags.contains("test-keys")) {
return true;
}

// Superuser.apk would only exist on a rooted device:
File file = new File("/system/app/Superuser.apk");
if (file.exists()) {
return true;
}

// su is only available on a rooted device (or the emulator)
// The user could rename or move to a non-standard location, but in that case they
// probably don't want us to know they're root and they can pretty much subvert
// any check anyway.
file = new File("/system/xbin/su");
if (!isEmulator && file.exists()) {
return true;
}
return false;
}