I am able to copy text from other programs and paste it to Android Studio. I am able to right click and copy selected text. I am able to cut text and paste it using shortcut. But while using shortcut Ctrl + C to copy text I am often unable to copy. This is very annoying problem. Does anyone here knows how to solve it?
If restarting AS does not resolve the issue you could try Invalidate Caches/Restart option. That sometimes fixes such issues.
----update----
This might fix your issue.
I used Invalidate Caches/Restart option and worked for me. you could try that.
Easiest Solution - Reset copy paste in Android Studio by clicking on an empty line and press Ctrl-C to copy nothing (crazy I know but it works). Then recopy your source and paste with Ctrl-V
Seem to work for me if I: goto Settings > Editor > General > under Limits change "Maximum number of contents to keep in clipboard" to 1.
Then copy something from within the Android Studio editor, and then the copy and paste from outside started to work for me.
Go to Settings -> Keymap -> And then select Eclipse for Keymaps dropdown view. Generally it is set to MAC OS 10 by default
Updating the Android Studio and Invalidate Caches/Restart option doesn't worked for me. But Paste Simple or Ctrl + Alt + Shift + V will works when you are trying to paste something from outside. Try using Copy Reference or Ctrl + Alt + Shift + C and Paste or Ctrl + V. It works for me.
Invalidating cache / restart didn't work for me. Reinstalling didn't work. Clearing the ~/.android directory didn't work. No answer I found worked.
What seemed to clear up the situation was disabling the "Android Support" plugin. Suddenly, cutting and pasting works again. But then all sorts of debugging features are missing. So that's not a real solution.
This is the real solution that worked for me. There's some sort of bug upgrading to Studio 3.0 that created an extra .xml file under the menu folder in res. Removing this file fixed everything.
I was setting up Android Studio based off my MAC settings. I found out that I had to change the Keymaps from MAC OSX to Default (Windows) Android Studio Keyboard shortcut control
来源：https://stackoverflow.com/questions/29522438/shortcut-for-copying-ctrl-c-not-working-in-android-studio