android start activity from service

Question

Android   public class LocationService extends Service     Override     public void onStart Intent intent  int startId            super onStart intent  startId           startActivity new Intent this  activity class              I launched this service from Activity  In Activity if condition satisfies start   startService new Intent WozzonActivity this  LocationService class      from my LocationService mentioned above could not launch Activity  how can I get context of current running Activity in service class

User · Answer

I had the same problem  and want to let you know that none of the above worked for me  What worked for me was    Intent dialogIntent   new Intent this  myActivity class    dialogIntent addFlags Intent FLAG ACTIVITY NEW TASK    this startActivity dialogIntent     and in one my subclasses  stored in a separate file I had to      public static Service myService   myService   this   new SubService myService    Intent dialogIntent   new Intent myService  myActivity class   dialogIntent addFlags Intent FLAG ACTIVITY NEW TASK   myService startActivity dialogIntent     All the other answers gave me a nullpointerexception

User · Answer

From inside the Service class   Intent dialogIntent   new Intent this  MyActivity class   dialogIntent addFlags Intent FLAG ACTIVITY NEW TASK   startActivity dialogIntent

User · Answer

Another thing worth mentioning  while the answer above works just fine when our task is in the background  the only way I could make it work if our task  made of service   some activities  was in the foreground  i e  one of our activities visible to user  was like this       Intent intent   new Intent storedActivity  MyActivity class       intent setAction Intent ACTION VIEW       intent setFlags Intent FLAG ACTIVITY NEW TASK       intent setFlags Intent FLAG ACTIVITY REORDER TO FRONT       storedActivity startActivity intent     I do not know whether ACTION VIEW or FLAG ACTIVITY NEW TASK are of any actual use here  The key to succeeding was  storedActivity startActivity intent     and of course FLAG ACTIVITY REORDER TO FRONT for not instantiating the activity again  Best of luck

User · Answer

If you need to recal an Activity that is in bacgrounde  from your service  I suggest the following link  Intent FLAG ACTIVITY NEW TASK is not the solution   https   stackoverflow com a 8759867 1127429

User · Answer

one cannot use the Context of the Service  was able to get the  package  Context alike   Intent intent   new Intent getApplicationContext    SomeActivity class

User · Answer

Alternately   You can use your own Application class and call from wherever you needs  especially non-activities    public class App extends Application        protected static Context context   null        Override     public void onCreate             super onCreate            context   getApplicationContext               public static Context getContext             return context             And register your Application class     lt application android name  yourpackage App        Then call    App getContext

User · Answer

UPDATE ANDROID 10 AND HIGHER Start an activity from service  foreground or background  is no longer allowed  There are still some restrictions that can be seen in the documentation https   developer android com guide components activities background-starts

[android] android start activity from service

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