Andoird Key codes , adb keyevent

Useful Android Keyevents inputs:

Some time it is extremely useful to send keyevent via adb for automation and other purposes.

#adb shell 

#input

usage: input [text|keyevent]
input text
input keyevent

adb shell
input text "HELLO"

LIST OF KEY CODES: 

1 --> "KEYCODE_MENU"
3 --> "KEYCODE_HOME"
4 --> "KEYCODE_BACK"
19 --> "KEYCODE_DPAD_UP"
20 --> "KEYCODE_DPAD_DOWN"
21 --> "KEYCODE_DPAD_LEFT"
22 --> "KEYCODE_DPAD_RIGHT"
23 --> "KEYCODE_DPAD_CENTER"
24 --> "KEYCODE_VOLUME_UP"
25 --> "KEYCODE_VOLUME_DOWN"
26 --> "KEYCODE_POWER"
27 --> "KEYCODE_CAMERA"
28 --> "KEYCODE_CLEAR"
55 --> "KEYCODE_COMMA"
56 --> "KEYCODE_PERIOD"
57 --> "KEYCODE_ALT_LEFT"
58 --> "KEYCODE_ALT_RIGHT"
59 --> "KEYCODE_SHIFT_LEFT"
60 --> "KEYCODE_SHIFT_RIGHT"
61 --> "KEYCODE_TAB"
62 --> "KEYCODE_SPACE"
66 --> "KEYCODE_ENTER"
67 --> "KEYCODE_DEL"
80 --> "KEYCODE_FOCUS"
82 --> "KEYCODE_MENU"
83 --> "KEYCODE_NOTIFICATION"
84 --> "KEYCODE_SEARCH" 

Enjoy