Is there a short cut to select one line of code in android studio?
Try using CTRL + C
This should select and copy the entire current line. Note that it won't work if you already have some text selected. In that case, CTRL + C would behave as usual, copying the text selected only.
I should note that I based my answer on that Android Studio is built off the IntelliJ platform, and so most shortcut keys are probably the same between the two.
Reference: Select current line in intellij