Dvorak-simplified keyboard is a keyboard layout that was developed to be quick to learn, to write faster, and to be better for hands.
For more information about what the layout means, check pages like
http://aoeu.info/
or
https://sv.wikipedia.org/wiki/Dvorak_%28tangentbordslayout%29
After installing the layout, connect a keyboard, enter settings.> Languages and Inputs and select your physical keyboard in the settings. Then add "Swedish dvorak" as a new layout.
It is also possible to change the layout when a text field is selected. For newer versions of android, a button appears to the right at the bottom of the screen, which you can press to access the settings.