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Sending data back to the Main Activity in Android

I have two activities: main activity and child activity.
When I press a button in the main activity, the child activity is launched.

Now I want to send some data back to the main screen. I used the Bundle class, but it is not working. It throws some runtime exceptions.

Is there any solution for this?

Sending data back to the Main Activity in Android

Shortest distance between a point and a line segment

I need a basic function to find the shortest distance between a point and a line segment. Feel free to write the solution in any language you want; I can translate it into what I’m using (Javascript).

EDIT: My line segment is defined by two endpoints. So my line segment AB is defined by the two points A (x1,y1) and B (x2,y2). I’m trying to find the distance between this line segment and a point C (x3,y3). My geometry skills are rusty, so the examples I’ve seen are confusing, I’m sorry to admit.

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