[android-developers] how to handle navigation between activities?

Hi,

Can anybody tell me what is the best way to do a navigation between
activities.
Like i am calling one activity from other and finishing the current
activity.

startActivity(intent);
finish();

But if i finish activity the i have to manage back functionality by
putting some values to intent.
If i am not going to finish the activity than is there any performance
or memory related issues.

when we should call startActivityForResult?

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