关于了解支持不同屏幕尺寸的信息

Question

i referred to a website to know how to create different layout folders to support different screen size. http://wptrafficanalyzer.in/blog/different-layouts-for-different-screen-sizes-in-android/

in the aforementioned link states the following :

res/layout-sw320dp : Devices with a smallest screen width which is greater than 320dp will make use the layouts defined in this folder

res/layout-sw480dp: Devices with a smallest screen width which is greater than 480dp will make use the layouts defined in this folder

my question is, what if there is a devie with screen width of 500dp for exampl, then which folder will be used 'res/layout-sw320dp' or 'res/layout-sw480dp'?

Answer 1

In the official documentation , under Provide different layouts for different screen sizes , you can read:

By default, Android resizes your application layout to fit the current device screen. In most cases, this works fine. In other cases, your UI might not look as good and might need adjustments for different screen sizes. For example, on a larger screen, you might want to adjust the position and size of some elements to take advantage of the additional screen space, or on a smaller screen, you might need to adjust sizes so that everything can fit on the screen.

The configuration qualifiers you can use to provide size-specific resources are small, normal, large, and xlarge. For example, layouts for an extra-large screen should go in layout-xlarge/.

Beginning with Android 3.2 (API level 13), the above size groups are deprecated and you should instead use the swdp configuration qualifier to define the smallest available width required by your layout resources. For example, if your multi-pane tablet layout requires at least 600dp of screen width, you should place it in layout-sw600dp/.

_{Emphasis mine.}

and further down, under Using new size qualifiers :

For example, if your layout requires that its smallest dimension of screen area be at least 600 dp at all times, then you can use this qualifier to create the layout resources, res/layout-sw600dp/. The system will use these resources only when the smallest dimension of available screen is at least 600dp , regardless of whether the 600dp side is the user-perceived height or width.

_{Emphasis mine.}

What this means that if you have a sw320dp and a sw480dp folder, a device with a screen width of 500dp will use the sw480dp folder.

A device with a screen width of 479dp will use the sw320dp folder.

Answer 2

Why don't you read the official documentation ?

There, in the examples, you can see:

For other cases in which you want to further customize your UI to differentiate between sizes such as 7” and 10” tablets, you can define additional smallest width layouts:

res/layout/main_activity.xml # For handsets (smaller than 600dp available width)

res/layout-sw600dp/main_activity.xml # For 7” tablets (600dp wide and bigger)

res/layout-sw720dp/main_activity.xml # For 10” tablets (720dp wide and bigger)

From this you can clearly see that a device with more than 720dp will not use the 600dp files.

So in your example the answer would be the 'res/layout-sw480dp' folder.