How can we access an android activity from within context?

Question

Trying to call a function from an activity, but I need the specific instance of that activity to do so.

Is there a way to call that specific activity from the application?

If not, is there a way to start an activity from the application so that I always have access to the instance I start running? I tried this, and edited the manifest, but the app never started...

Without knowing the details this sounds like you should rethink your design. You don't know in which state your activity instance is when you call it. — Henry, Oct 13 '15 at 05:28
It's not hard for you to do this.But IT'S NOT SUITABLE FOR YOU TO CALL A FUNCTION FROM AN ACTIVITY OUTSIDE. — ifeegoo, Oct 13 '15 at 05:33

score 2 · Answer 1 · answered Oct 13 '15 at 05:36

As concerned with the limited details in this question, I think your requirement is to call a function in an activity that needs that activity itself as the parameter. I think you can do it like this.

Activity actiity=this;  
yourMethode(activity)
{
//body of your methode
}

Whenever you use the variable "activity", you can get an instance to the current activity.

score 0 · Answer 2 · answered Oct 13 '15 at 05:39

I think you are talking about casting the context to get the type of activity it represents. You can do it like this. But be careful if the context is not of that type you will most likely cause a crash.

((MainActivity) mContext).myMethod();

This is not really recommended as it will cause some tight coupling between the class and the activity.

How can we access an android activity from within context?

2 Answers2