Android API Guides 之 App Manifest（7） - <compatible-screens>

<compatible-screens>

SYNTAX:

<compatible-screens>
    <screen android:screenSize=["small" | "normal" | "large" | "xlarge"]
            android:screenDensity=["ldpi" | "mdpi" | "hdpi" | "xhdpi"] />
    ...
</compatible-screens>

CONTAINED IN:

<manifest>

DESCRIPTION:Specifies each screen configuration with which the application is compatible. Only one instance of the

<compatible-screens>

 element is allowed in the
manifest, but it can contain multiple 

<screen>

elements. Each 

<screen>

 element specifies a specific screen size-density
combination with which the application is compatible.
The Android system does not read the 

<compatible-screens>

 manifest element (neither at install-time nor at runtime). This element
is informational only and may be used by external services (such as Google Play) to better understand the application's compatibility with specific screen configurations and enable filtering for users. Any screen configuration that is not declared
in this element is a screen with which the application is not compatible. Thus, external services (such as Google Play) should not provide the application to devices with such screens.

Caution: Normally, you should not use this manifest element. Using this element can dramatically reduce the potential user base for your application, by not allowing users to install your application if they have a device with
a screen configuration that you have not listed. You should use it only as a last resort, when the application absolutely does not work with specific screen configurations. Instead of using this element, you should follow the guide to Supporting
Multiple Screens to provide scalable support for multiple screens using alternative layouts and bitmaps for different screen sizes and densities.
If you want to set only a minimum screen size for your your application, then you should use the

<supports-screens>

 element.
For example, if you want your application to be available only for large andxlarge screen devices, the 

<supports-screens>

 element
allows you to declare that your application does not support small and normal screen sizes. External services (such as Google Play) will filter your application accordingly. You can also use the 

<supports-screens>

 element
to declare whether the system should resize your application for different screen sizes.
Also see the Filters on Google Play document for more information about how
Google Play filters applications using this and other manifest elements.
CHILD ELEMENTS:

<screen>

Specifies a single screen configuration with which the application is compatible.
At least one instance of this element must be placed inside the 

<compatible-screens>

 element. This element must include both the 

android:screenSize

 and 

android:screenDensity

 attributes
(if you do not declare both attributes, then the element is ignored).
attributes:

android:screenSize

Required. Specifies the screen size for this screen configuration.
Accepted values:

small

normal

large

xlarge

For information about the different screen sizes, see Supporting
Multiple Screens.

android:screenDensity

Required. Specifies the screen density for this screen configuration.
Accepted values:

ldpi

mdpi

hdpi

xhdpi

Note: This attribute currently does not accept 

xxhdpi

 as a valid value, but you can instead specify 

480

 as
the value, which is the approximate threshold for xhdpi screens.
For information about the different screen densities, see Supporting
Multiple Screens.
EXAMPLE
If your application is compatible with only small and normal screens, regardless of screen density, then you must specify eight different 

<screen>

 elements,
because each screen size has four different density configurations. You must declare each one of these; any combination of size and density that you do notspecify is considered a screen configuration with which your application is not compatible.
Here's what the manifest entry looks like if your application is compatible with only small and normal screens:

<manifest ... >
    ...
    <compatible-screens>
        <!-- all small size screens -->
        <screen android:screenSize="small" android:screenDensity="ldpi" />
        <screen android:screenSize="small" android:screenDensity="mdpi" />
        <screen android:screenSize="small" android:screenDensity="hdpi" />
        <screen android:screenSize="small" android:screenDensity="xhdpi" />
        <!-- all normal size screens -->
        <screen android:screenSize="normal" android:screenDensity="ldpi" />
        <screen android:screenSize="normal" android:screenDensity="mdpi" />
        <screen android:screenSize="normal" android:screenDensity="hdpi" />
        <screen android:screenSize="normal" android:screenDensity="xhdpi" />
    </compatible-screens>
    <application ... >
        ...
    <application>
</manifest>

INTRODUCED IN:API Level 9SEE ALSO:Supporting Multiple ScreensFilters on Google Play