To build you need to check out the following projects:
https://code.google.com/p/googletv-android-samples
https://github.com/yolanother/EnhancedLivewareSdk.git

Once you have these projects downloaded you need to add them to Eclipse as library projects.

If you want to add new buttons to the watch remote you need to add a layout for the watch page in res/ and you need to update remote_page_layout.xml. See rp_playback_control.xml for an example.

Valid Key Codes
=====================
KEYCODE_SOFT_LEFT
KEYCODE_SOFT_RIGHT
KEYCODE_HOME
KEYCODE_BACK
KEYCODE_CALL
KEYCODE_0
KEYCODE_1
KEYCODE_2
KEYCODE_3
KEYCODE_4
KEYCODE_5
KEYCODE_6
KEYCODE_7
KEYCODE_8
KEYCODE_9
KEYCODE_STAR
KEYCODE_POUND
KEYCODE_DPAD_UP
KEYCODE_DPAD_DOWN
KEYCODE_DPAD_LEFT
KEYCODE_DPAD_RIGHT
KEYCODE_DPAD_CENTER
KEYCODE_VOLUME_UP
KEYCODE_VOLUME_DOWN
KEYCODE_POWER
KEYCODE_CAMERA
KEYCODE_A
KEYCODE_B
KEYCODE_C
KEYCODE_D
KEYCODE_E
KEYCODE_F
KEYCODE_G
KEYCODE_H
KEYCODE_I
KEYCODE_J
KEYCODE_K
KEYCODE_L
KEYCODE_M
KEYCODE_N
KEYCODE_O
KEYCODE_P
KEYCODE_Q
KEYCODE_R
KEYCODE_S
KEYCODE_T
KEYCODE_U
KEYCODE_V
KEYCODE_W
KEYCODE_X
KEYCODE_Y
KEYCODE_Z
KEYCODE_COMMA
KEYCODE_PERIOD
KEYCODE_ALT_LEFT
KEYCODE_ALT_RIGHT
KEYCODE_SHIFT_LEFT
KEYCODE_SHIFT_RIGHT
KEYCODE_TAB
KEYCODE_SPACE
KEYCODE_EXPLORER
KEYCODE_ENTER
KEYCODE_DEL
KEYCODE_GRAVE
KEYCODE_MINUS
KEYCODE_EQUALS
KEYCODE_LEFT_BRACKET
KEYCODE_RIGHT_BRACKET
KEYCODE_BACKSLASH
KEYCODE_SEMICOLON
KEYCODE_APOSTROPHE
KEYCODE_SLASH
KEYCODE_AT
KEYCODE_FOCUS
KEYCODE_PLUS
KEYCODE_MENU
KEYCODE_SEARCH
KEYCODE_MEDIA_PLAY_PAUSE
KEYCODE_MEDIA_STOP
KEYCODE_MEDIA_NEXT
KEYCODE_MEDIA_PREVIOUS
KEYCODE_MEDIA_REWIND
KEYCODE_MEDIA_FAST_FORWARD
KEYCODE_MUTE
KEYCODE_CTRL_LEFT
KEYCODE_CTRL_RIGHT
KEYCODE_INSERT
KEYCODE_PAUSE
KEYCODE_PAGE_UP
KEYCODE_PAGE_DOWN
KEYCODE_PRINT_SCREEN
KEYCODE_INFO
KEYCODE_WINDOW
KEYCODE_BOOKMARK
KEYCODE_CAPS_LOCK
KEYCODE_ESCAPE
KEYCODE_META_LEFT
KEYCODE_META_RIGHT
KEYCODE_ZOOM_IN
KEYCODE_ZOOM_OUT
KEYCODE_CHANNEL_UP
KEYCODE_CHANNEL_DOWN
KEYCODE_LIVE
KEYCODE_DVR
KEYCODE_GUIDE
KEYCODE_MEDIA_SKIP_BACK
KEYCODE_MEDIA_SKIP_FORWARD
KEYCODE_MEDIA_RECORD
KEYCODE_MEDIA_PLAY
KEYCODE_PROG_RED
KEYCODE_PROG_GREEN
KEYCODE_PROG_YELLOW
KEYCODE_PROG_BLUE
KEYCODE_BD_POWER
KEYCODE_BD_INPUT
KEYCODE_STB_POWER
KEYCODE_STB_INPUT
KEYCODE_STB_MENU
KEYCODE_TV_POWER
KEYCODE_TV_INPUT
KEYCODE_AVR_POWER
KEYCODE_AVR_INPUT
KEYCODE_AUDIO
KEYCODE_EJECT
KEYCODE_BD_POPUP_MENU
KEYCODE_BD_TOP_MENU
KEYCODE_SETTINGS
KEYCODE_SETUP