Android: is it efficient to store references to Views as member variables?

Question

If I have a view that I will be referencing with decent regularity (to change its visibility, etc...), is it more efficient to store this View as a member variable or to execute findViewById() each time I need a reference to it?

The member variable requires memory usage, while the method my take more time. Is anyone aware of an established best practice for this?

Answer 1

It is much more efficient to store the reference. The memory cost of the reference will be minimal (I don't remember the exact cost but it's in the order of 4 bytes.)