Android - How to create the instance of an Activity class

Question

Although we can achieve to create a new instance of Fragment, why we can't do the same process to Activity class?

Who knows how we can manage activity from this perspective?

you don't create instance of activity (you don't new activity) you start an activity, OS and APIs take care of this for you — Yazan, Jan 04 '18 at 09:38
https://stackoverflow.com/questions/14956018/can-i-create-the-object-of-a-activity-in-other-class — Om Infowave Developers, Jan 04 '18 at 09:41

score 2 · Answer 1 · answered Jan 04 '18 at 09:41

2

Activity instances are always created by the Android system. This is because a lot of initializations have to be done for the activity to work.

To create a new activity you call startActivity with an Intent describing the activity to start.

answered Jan 04 '18 at 09:41

Henry

To add more to this answer. Activity, Service, BroadcastReceiver and ContentProvider all are system components. Android OS is responsible for creating, managing and destroying the instance of them. – Rohit Singh Feb 11 '22 at 16:24

score 0 · Answer 2 · answered Jan 04 '18 at 09:44

0

Activity A should have a variable

static ActivityA activityA;

In onCreate state:

activityA = this;

and add this method:

public static ActivityA getInstance(){ return activityA; }

In activity B, call

ActivityA.getInstance().myFunction();

In order to get more information please go through this documentation:

answered Jan 04 '18 at 09:44

Tarlan Ahad

4

Actually, don't do that. There are just too many scenarios where this will go wrong. And probably even more serious the activity will then be never garbage collected. – Henry Jan 04 '18 at 09:56
I agree with you – Tarlan Ahad Jan 04 '18 at 09:58
This does not seem right. It could become a source of memory leak. – Rohit Singh Feb 11 '22 at 16:22

2 Answers2