Paste text on Android Emulator

In a terminal, type adb shell input text 'my string here. With some characters escaped like \$ that'

Note that an alternative method for including spaces in the text is to substitute %s for each space character.

Just copy from wherever, click and hold on the emulator phone's edit text where you want the text to go (kind of like you would press and hold to paste on an actual phone), the PASTE option will appear, then PASTE.

With v25.3.x of the Android Emulator & x86 Google API Emulator system images API Level 19 (Android 4.4 - Kitkat) and higher, you can simply copy and paste from your desktop with your mouse or keyboard.

This feature was announced with Android Studio 2.3