Android: How to take notes the fastest way possible2
To take notes on an Android handset the fastest way possible, you have to rely on Google Now, and you need to enable the OK Google command to work on any screen. If the command is enabled and your phone in not offline, you can say "OK Google" (works even from the lock screen) to activate Google Now, then simply tell it to "take note." Wait for the "Sure, what's the note?" question, and dictate your note - that's all it takes. If your device is running stock Android, you can choose to take notes this way using either Google Keep, or Gmail. In the case of Gmail, notes will appear as emails sent to yourself with the title "Note to self."
Depending on the length of the note, you can take a note with Google Now in under 10 seconds from the moment you're picking up your phone. That's quite fast, isn't it?