compare to eclipse, you can use the same keystore for debug and release.
source – http://stackoverflow.com/a/17992232 with pictures.
1) Go to File > Project Structure > select project > go to “signing” tab and select your default or any keystore you want and fill all the details. In case you are not able to fill the details, hit the green ‘+’ button. I’ve highlighted in the screenshot.
2)Goto Build Types> select your build type and select your “Signing Config”. In my case, I’ve to select “config”. Check the highlighted region.
3)File > Save All
4)Restart IDE