Changing activity from other app android

Question

I want to block the opening of certain programs.

Example: I have a program (A) with all the configurations (a key, list of programs to lock).

When active (A), and you open a program (B) (shortscreen from android menu), if it is on the list of locked programs, instead of opening it, (A) should be opened first. My intent is to ask my key (A) if it is allowed and then the intended program (B) is open.

Sample Program here.

Prompt: How can app (A) see what program is opening (B) and replace that with my intent or fragment.

P.S. Sorry my bad english.

Answer 1

I solved this with Service

    public class RepeatClass extends Service {
        private static final String TAG = "ServiceTag";
        private boolean isRunning  = false;

        @Override
        public void onCreate() {
            Log.i(TAG, "Service onCreate");
            isRunning = true;
        }

        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {

            Log.i(TAG, "Service onStartCommand");

            //Creating new thread for my service
            //Always write your long running tasks in a separate thread, to avoid ANR
            new Thread(new Runnable() {
                @Override
                public void run() {

                    //Your logic that service will perform will be placed here
                    //In this example we are just looping and waits for 1000 milliseconds in each loop.
                    while (true) {try {
                            Thread.sleep(1000);
    //Detect openning programm with activeManager and open normal intent
    }
    catch(Exception e){
    }
}
}
}