"Android Question" What is the difference between starting another activity in an activity and starting an activity in the service?

In activity, you can start another activity directly using intent.

Explicit Intent Intent = new Intent (context, Activity.class)

Implicit Intent Intent = new Intent ("Com.aa.www.act");

StartActivity (Intent);

If you start the activity in the same way from the service, you will get an error:

Android.util.AndroidRuntimeException:Calling startactivity () from outside of an Activity context requires the FLAGAC TivityNEWTASK flag. Is this really what do you want?

need to set Intent.setflags (Intent.flagACTIVITYNEWTASK); Then open the activity code as follows:

Intent Intent = new Intent ("Hahaha.hahaha");

Intent.setflags (Intent.flagACTIVITYnew_task);

StartActivity (Intent);

"Android Question" What is the difference between starting another activity in an activity and starting an activity in the service?