You must set it in your onCreate method of your FragmentActivity :
activity.getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
Question
I have to restrict user to take screenshot. So I want to add FLAG_SECURE flag in my class which extends DialogFragment. Can anyone please tell me where and how to add that flag. Thanks in advance.
Solution
You must set it in your onCreate method of your FragmentActivity :
activity.getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
OTHER TIPS
I got this working by overriding onViewCreated like so in Kotlin:
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
this.dialog?.window?.setFlags(FLAG_SECURE, FLAG_SECURE)
super.onViewCreated(view, savedInstanceState)
}