I was wondering the same thing, especially how to do this by default as @adnako asked. I finally found an answer so I will post here, too.
Manually change a single value
Right click > View as... > Hex
![enter image description here](https://i.stack.imgur.com/Un997.png)
Display all values as hex by default
Right click > Custimize Data Views... > Show hex values for primitives > Apply
![enter image description here](https://i.stack.imgur.com/QaJDD.png)
(Note: these images are from Android Studio 1.2)
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