how apps Screen resolution compatibility works in HTC one xl?

hii all, Most of us might have noticed that every phone has different screen resolution and we run same application. I am using HTC ONE XL which is 1280 x 720 screen resolution phone and friend have HTC Sensation which is 540 x 960 screen resolution phone. So, how applications screen resolution compatibility works on different phones because both have different screen resolution?

No one can design a application for particular screen resolution, because different phone have different screen resolution. Some of the application developer use auto scaling to control screen resolution. At time of developing application there are many screen resolution provided and when application are installing it takes some phone info like which Cpu is installed?, how much Mb of Ram installed?, free space on your storage, which screen resolution your phone supports, etc from your phone. As per these controls will manage screen resolution before installing the application.

I am new buddy in developing application. I have application which want to develop and want to run on multiple screen resolution but don’t have much knowledge about multiple screen compatibility. So, please any one help me pls?
And thank you in advance

The objective of supporting on different screens resolution is to create an application that can function properly and look good on any of the screen configurations. The type of different screen resolution you should create depends on your application requirements. So, you can try to use screen size and screen Orientation Qualifier to provide different screen resolution and layouts and also use the Screen density Qualifier and screen resolution Qualifier. You need different layout for different screen resolution. You need to test your different screen configuration like Testing on small screen, testing one extra large screen, testing on landscape screen. You should be sure your application supports all layouts to use the multiple screen resolution. You need wrap_content, fill_parent, or the dp unit for specifying layout dimensions. There are many additional density consideration are there if you want to use like Pre-Scaling of resources, auto-scaling of Pixel dimension and coordinates. Finally you need to test all of supporting screen size and density of your application by any virtual taster before publishing.