You get a screenshot, you get a screenshot, everygets a screenshot!

It's a very simple tool presented as a Quick Tile to simplify the process of setting up and activating Demo Mode. It's already pre-configured out of the box with perfect 7:00 clock, full WiFi, full signal and full battery icons for stunning clutter-free screenshots.

For it to work you need to grant it two permissions through adb shell from your computer:
adb -d shell pm grant com.franco.demomode android.permission.DUMP
adb -d shell pm grant com.franco.demomode android.permission.WRITE_SECURE_SETTINGS

The DUMP permission is required for the Demo Mode to actually work, and the WRITE_SECURE_SETTINGS is necessary for the Quick Tile to read the setting and present the correct icon depending on its state.

Since these permissions can be a little scary, for transparency sake I've open sourced it github.com/franciscofranco/Demo-Mode-tile
From version Demo Mode tile 1.3:
1.3
Update to the latest sdk version
All versions
May 1, 2018
March 26, 2017
December 13, 2016
December 13, 2016