How to scale whole app to fit a different divice with high dpi?

[wshn14]

I develop a app which target device is a phone with screen size 720X1280 ,the resources like image files are all designed to fit the device , but now the app run in a different device which size is 1080X1920 ,so my app looks so small , I want my whole app scale to fit the new screen but not to edit my source code line by line or change the image size .I use the qt5 , I need help .

[wshn14]

I need help

[wshn14]

I need urg help

[wshn14]

help me

[dbzhang800]

Hi, QLayout/Layout is designed for such cases.

[wshn14]

I know that but I need scale the whole app ,do you know how ?You from China
[quote author="1+1=2" date="1386748186"]Hi, QLayout/Layout is designed for such cases.[/quote]

[dbzhang800]

If you want to scale images, border image should be considered.

[wshn14]

I know borerimage but it is not what my need ,my require is that scale the whole app ui to a certain size
[quote author="1+1=2" date="1386831318"]If you want to scale images, border image should be considered.[/quote]