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By adding Apps to White list, you can keep them active in background, so you
can recieve messages at real time, otherwise, the system will clear apps
regularly for saving energy.
If you don't want the system clean Apps automatically, you can shut it down.
How to add Apps to White list?
Method 1. Enter interface of
Multitask, press the button in top
right, opt Lock, you can unlock apps
with the same opration.
Method 2. Enter interface of
Multitask, press the button in top
right, opt Manage, enter White List.
You can lock and
unlock Apps by
Taping
Doke OS
White list