How to set the SMS background image of OPPOr9?

1. Method: Just change the theme wallpaper.

2. The specific operation is as follows:

1) Open the theme store first.

2) Then click "I".

3) Click "My Resources" again.

4) Finally, click "My Lock Screen".

5) Slide upward to unlock.

6) Just choose your favorite picture.

According to the specific types of problems, step disassembly/cause principle analysis/content expansion, etc.

The specific steps are as follows:/The main reasons for this situation are ...