I'm trying to download a mobile credit card app and it requires the resolution be this. How can I change my screen resolution to 1024x768 on a Samsung Galaxy S3?
You may need to be rooted. You will need to install terminal emulator. You may also need to install some type of script management tool.
in terminal run:
to display current window manager settings run
wm size && wm density
Output ,for my device, yours will vary,
Physical size: 800x1280 Physical density: 180
To set to required size , [landscape]
wm size 768x1024 stop && start
NOTE: You WILL need to repeat the process to set your screen back to normal so, keep note of your original screen size. This is why i suggest a script management tool.
To return screen to original size; [my device, landscape]
wm size 800x1280 stop && start
You may need to reset your lockscreen wallpaper, mine doesn't seem to restore to proper size when i perform these commands.