Why doesn't the mobile phone display QQ information when the screen is locked?

It should be that your QQ has not set the function of "message pop-up with screen locked", just turn on this setting, and the method is as follows:

My mobile phone Android system, brand: True Me, QQ version number: V8.8.50.6735.

The first step is to open QQ and click on the avatar in the upper left corner.

Step 2: In the Personal Center, find the Settings button in the lower left corner to enter.

Step 3, find "Message Notification" on the settings page to enter.

Step 4: Find the "Message Notification" setting on the message notification page.

Step 5: Open two settings as shown below, namely "Notification Display Message Preview" and "Lock Screen Display Message Pop-up". (Blue indicates that the setting is turned on)

After this setting, you can also receive QQ messages when the screen is locked.