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SimpleDrawerListener vs no-op: memory efficient listener

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Thanks Meter: 6
By surlac, Member on 23rd August 2014, 10:35 PM
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I'm implementing a listener for DrawerLayout and found that SimpleDrawerListener class is more memory efficient than implementing your own via DrawerListener interface.
According to one of the books:

"DrawerLayout.SimpleDrawerListener offers the default (no special options) implementation of each of the DrawerListener callback methods. Use this if you are just accessing the core functionality of the UI DrawerLayout class as it provides simpler, more memory efficient code."

For example, I need only 1 method from 4 available in DrawerListener.
How extending SimpleDrawerListener and overriding this particular method can be more memory efficient than implementing interface and leaving 3 methods empty? What can be more "memory efficient" than empty method?
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drawer, memory

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