How to turn on bluetooth without user interaction?

[al ways]

Every time when the tasker set bluetooth on, my phone always prompt following information:

Allow APP to enable Bluetooth？
Decline OK

The bluetooth will be turned on if I touch OK.

How to turn on bluetooth without user interaction?

 

[WarriusZero]

What device is it? Running what OS?

 

[al ways]

Lenovo VibeZ K910 on Android 4.4.2 KK