Android - start multiple activities

Question

is it possible to start multiple activities at once? I mean, from main create 3 activities in some order and just the last will be visible? Up to now, I was able to create only one activity.

Thanks

Answer 1

You might need something like this in order to launch deep into the app after the user has clicked a notification in order to display some newly added content, for example.

Intent i = new Intent(this, A.class); i.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); startActivity(i);  Intent j = new Intent(this, B.class); j.setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); startActivity(j);  Intent k = new Intent(this, C.class); startActivity(k); 

In this way you can start activities A, B and C at the same time and suppress transitions to activities A and B. You get a single transition from your current activity to activity C. I strongly suggest that you log the Activity lifecycle method calls (onCreate etc.) to LogCat, for example. It helps a lot in understanding the order of events.

Answer 2

This can be a common thing to do in response to deep linking or other use cases where you, basically, need to synthetically rebuild the Task (and all the activities it should contain). Sometimes, just specifying parents in the manifest isn't enough.

Take a look at TaskStackBuilder. One common example:

TaskStackBuilder.create( context )         .addNextIntent( intentOnBottom )         // use this method if you want "intentOnTop" to have it's parent chain of activities added to the stack. Otherwise, more "addNextIntent" calls will do.         .addNextIntentWithParentStack( intentOnTop )         .startActivities();