<supports-screens>

<supports-screens android:resizeable=["true" | "false"]
                  android:smallScreens=["true" | "false"] 
                  android:normalScreens=["true" | "false"] 
                  android:largeScreens=["true" | "false"] 
                  android:xlargeScreens=["true" | "false"]
                  android:anyDensity=["true" | "false"] />

An application "supports" a given screen size if it fills the entire screen and works as expected. By default, the system will resize your application to fill the screen, if you have set either minSdkVersion or targetSdkVersion to "4" or higher. Resizing works well for most applications and you don't have to do any extra work to make your application work on larger screens.

In addition to allowing the system to resize your application, you can add additional support for different screen sizes by providing alternative layout resources for different sizes. For instance, you might want to modify the layout of an activity when it is on a tablet or similar device that has an xlarge screen.

If your application does not support large or xlarge screens, then you should declare that it is not resizeable by setting android:resizeable to "false", so that the system will not resize your application on larger screens.

If your application does not support small screens, then there isn't much the system can do to make the application work well on a smaller screen, so external services (such as Android Market) should not allow users to install the application on such screens.

For more information, see Supporting Multiple Screens.

android:resizeable

Indicates whether the application is resizeable for different screen sizes. This attribute is true, by default, if you have set either minSdkVersion or targetSdkVersion to "4" or higher. Otherwise, it is false by default. If set false, the system will not resize your application when run on large or xlarge screens. Instead, the application appears in a "postage stamp" that equals the normal screen size that your application does support. This is less than an ideal experience for users, because the application appears smaller than the available screen, but it might help your application run normally if it were designed only for the normal screen size and some behaviors do not work when resized.

To provide the best experience on all screen sizes, you should allow resizing and, if your application does not work well on larger screens, follow the guide to Supporting Multiple Screens to enable additional screen support.

android:smallScreens

Indicates whether the application supports smaller screen form-factors. A small screen is defined as one with a smaller aspect ratio than the "normal" (traditional HVGA) screen. An application that does not support small screens will not be available for small screen devices from external services (such as Android Market), because there is little the platform can do to make such an application work on a smaller screen. If the application has set either minSdkVersion or targetSdkVersion to "4" or higher, the default value for this is "true", any value less than "4" results in this set to "false".

android:normalScreens

Indicates whether an application supports the "normal" screen form-factors. Traditionally this is an HVGA medium density screen, but WQVGA low density and WVGA high density are also considered to be normal. This attribute is "true" by default, and applications currently should leave it that way.

android:largeScreens

Indicates whether the application supports larger screen form-factors. A large screen is defined as a screen that is significantly larger than a "normal" phone screen, and thus might require some special care on the application's part to make good use of it, though it may rely on resizing by the system to fill the screen. If the application has set either minSdkVersion or targetSdkVersion to "4" or higher, the default value for this is "true", any value less than "4" results in this set to "false".

android:xlargeScreens

Indicates whether the application supports extra large screen form-factors. An xlarge screen is defined as a screen that is significantly larger than a "large" screen, such as a tablet (or something larger) and may require special care on the application's part to make good use of it, though it may rely on resizing by the system to fill the screen. If the application has set either minSdkVersion or targetSdkVersion to "4" or higher, the default value for this is "true", any value less than "4" results in this set to "false".

This attribute was introduced in API Level 9.

android:anyDensity

Indicates whether the application includes resources to accommodate any screen density. Older applications (before API Level 4) are assumed unable to accomodate all densities and this is "false" by default. If the application has set either minSdkVersion or targetSdkVersion to "4" or higher, the default value for this is "true". Otherwise, it is "false". You can explicitly supply your abilities here.

Based on the "standard" device screen density (medium dpi), the Android framework will scale down application assets by a factor of 0.75 (low dpi screens) or scale them up by a factor of 1.5 (high dpi screens), when you don't provide alternative resources for a specifc screen density. The screen density is expressed as dots-per-inch (dpi).

• Supporting Multiple Screens
• DisplayMetrics