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# 7\. Hardware Compatibility
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If a device includes a particular hardware component that has a corresponding
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API for third-party developers:
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* [C-0-1] The device implementation MUST implement that
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API as described in the Android SDK documentation.
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If an API in the SDK
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interacts with a hardware component that is stated to be optional and the
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device implementation does not possess that component:
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* [C-0-2] Complete class definitions (as documented by the SDK) for the component
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APIs MUST still be presented.
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* [C-0-3] The API’s behaviors MUST be implemented as no-ops in some reasonable
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fashion.
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* [C-0-4] API methods MUST return null values where permitted by the SDK
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documentation.
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* [C-0-5] API methods MUST return no-op implementations of classes where null values
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are not permitted by the SDK documentation.
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* [C-0-6] API methods MUST NOT throw exceptions not documented by the SDK
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documentation.
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* [C-0-7] Device implementations MUST consistently report accurate hardware
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configuration information via the `getSystemAvailableFeatures()` and
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`hasSystemFeature(String)` methods on the
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[android.content.pm.PackageManager](
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http://developer.android.com/reference/android/content/pm/PackageManager.html)
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class for the same build fingerprint.
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A typical example of a scenario where these requirements apply is the telephony
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API: Even on non-phone devices, these APIs must be implemented as reasonable
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no-ops.
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