This wikiHow teaches you how to change the background image for your Android device's lock screen.
Step
Step 1. Run the Gallery app on the Android device
This app is in the app drawer or home screen. The icon may be in the form of a photo or a painting. On Samsung devices, the icon is orange with a white flower in the center.
Step 2. Touch the image you want to use
The image will open in full screen.
Step 3. Touch
It's in the top-right corner. You may have to touch the screen once for this button to appear. On some devices, the icon can take the form of ☰.
Step 4. Touch Set as wallpaper
On some devices, this option may say Set lock screen, Set picture as, or Use as.
Step 5. Touch Lock screen
The name of the option can be different.
Step 6. Arrange the image inside the frame
The lock screen only uses the part of the photo that is inside the frame.
Step 7. Touch Save or Done.
This button can say Set or Set as Wallpaper on multiple devices. Doing so will change the background for the device lock screen to the image you selected.