Reference to aosp\frameworks\base\packages\SystemUI\README
Demo mode for the status bar allows you to force the status bar into a fixed state, useful for taking screenshots with a consistent status bar state, or testing different status icon permutations. Demo mode is available in recent versions of Android.

Enabling demo mode

Demo mode is protected behind a system setting. To enable it for a device, run:

1	adb shell settings put global sysui_demo_allowed 1

Protocol

The protocol is based on broadcast intents, and thus can be driven via the command line (adb shell am broadcast) or an app (Context.sendBroadcast).

Broadcast action

1	com.android.systemui.demo

Commands

Commands and subcommands (below) are sent as string extras in the broadcast
intent.

Commands are sent as string extras with key command (required). Possible values are:

Command	Subcommand	Argument	Description
`enter`			Enters demo mode, bar state allowed to be modified (for convenience, any of the other non-exit commands will automatically flip demo mode on, no need to call this explicitly in practice)
`exit`			Exits demo mode, bars back to their system-driven state
`battery`			Control the battery display
	`level`		Sets the battery level (0 - 100)
	`plugged`		Sets charging state (`true`, `false`)
`network`			Control the RSSI display
	`airplane`		`show` to show icon, any other value to hide
	`fully`		Sets MCS state to fully connected (`true`, `false`)
	`wifi`		`show` to show icon, any other value to hide
		`level`	Sets wifi level (null or 0-4)
	`mobile`		`show` to show icon, any other value to hide
		`datatype`	Values: `1x`, `3g`, `4g`, `e`, `g`, `h`, `lte`, `roam`, any other value to hide
		`level`	Sets mobile signal strength level (null or 0-4)
	`carriernetworkchange`		Sets mobile signal icon to carrier network change UX when disconnected (`show` to show icon, any other value to hide)
	`sims`		Sets the number of sims (1-8)
	`nosim`		`show` to show icon, any other value to hide
`bars`			Control the visual style of the bars (opaque, translucent, etc)
	`mode`		Sets the bars visual style (opaque, translucent, semi-transparent)
`status`			Control the system status icons
	`volume`		Sets the icon in the volume slot (`silent`, `vibrate`, any other value to hide)
	`bluetooth`		Sets the icon in the bluetooth slot (`connected`, `disconnected`, any other value to hide)
	`location`		Sets the icon in the location slot (`show`, any other value to hide)
	`alarm`		Sets the icon in the alarm_clock slot (`show`, any other value to hide)
	`sync`		Sets the icon in the sync_active slot (`show`, any other value to hide)
	`tty`		Sets the icon in the tty slot (`show`, any other value to hide)
	`eri`		Sets the icon in the cdma_eri slot (`show`, any other value to hide)
	`mute`		Sets the icon in the mute slot (`show`, any other value to hide)
	`speakerphone`		Sets the icon in the speakerphone slot (`show`, any other value to hide)
`notifications`			Control the notification icons
	`visible`		`false` to hide the notification icons, any other value to show
`clock`			Control the clock display
	`millis`		Sets the time in millis
	`hhmm`		Sets the time in hh:mm

Examples

Enter demo mode

1	adb shell am broadcast -a com.android.systemui.demo -e command enter

Exit demo mode

1	adb shell am broadcast -a com.android.systemui.demo -e command exit

Set the clock to 12:31

1 2	adb shell am broadcast -a com.android.systemui.demo -e command clock -e hhmm 1231

Set the wifi level to max

1 2	adb shell am broadcast -a com.android.systemui.demo -e command network -e wifi show -e level 4

Show the silent volume icon

1 2	adb shell am broadcast -a com.android.systemui.demo -e command status -e volume silent

Empty battery, and not charging (red exclamation point)

1 2	adb shell am broadcast -a com.android.systemui.demo -e command battery -e level 0 -e plugged false

Hide the notification icons

1 2	adb shell am broadcast -a com.android.systemui.demo -e command notifications -e visible false

Exit demo mode

1	adb shell am broadcast -a com.android.systemui.demo -e command exit

Example demo controller app in AOSP

1	frameworks/base/tests/SystemUIDemoModeController

Example script (for screenshotting purposes)

#!/bin/sh
CMD=$1

if [[ $ADB == "" ]]; then
  ADB=adb
fi

if [[ $CMD != "on" && $CMD != "off" ]]; then
  echo "Usage: $0 [on|off] [hhmm]" >&2
  exit
fi

if [[ "$2" != "" ]]; then
  HHMM="$2"
fi

$ADB root || exit
$ADB wait-for-devices
$ADB shell settings put global sysui_demo_allowed 1

if [ $CMD == "on" ]; then
  $ADB shell am broadcast -a com.android.systemui.demo -e command enter || exit
  if [[ "$HHMM" != "" ]]; then
    $ADB shell am broadcast -a com.android.systemui.demo -e command clock -e
hhmm ${HHMM}
  fi
  $ADB shell am broadcast -a com.android.systemui.demo -e command battery -e
plugged false
  $ADB shell am broadcast -a com.android.systemui.demo -e command battery -e
level 100
  $ADB shell am broadcast -a com.android.systemui.demo -e command network -e
wifi show -e level 4
  $ADB shell am broadcast -a com.android.systemui.demo -e command network -e
mobile show -e datatype none -e level 4
  $ADB shell am broadcast -a com.android.systemui.demo -e command notifications
-e visible false
elif [ $CMD == "off" ]; then
  $ADB shell am broadcast -a com.android.systemui.demo -e command exit
fi

Link

aosp\frameworks\base\packages\SystemUI