I have my keyboard working on every activity, but I am not getting any good way to make it run on specific activities of different apps.
Is there a way to check the activity running and open the keyboard there if it is in my list?
I have my keyboard working on every activity, but I am not getting any good way to make it run on specific activities of different apps.
Is there a way to check the activity running and open the keyboard there if it is in my list?
No.
First, you have no reliable way to "check the activity running", for privacy and security reasons, particularly on newer versions of Android.
Second, the user decides what input method editor to choose, as a default and on a situational basis. You do not get a vote, again for privacy and security reasons.