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1. Introduction

This document enumerates the requirements that must be met in order for devices to be compatible with Android 11.

The use of “MUST”, “MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”, “RECOMMENDED”, “MAY”, and “OPTIONAL” is per the IETF standard defined in RFC2119.

As used in this document, a “device implementer” or “implementer” is a person or organization developing a hardware/software solution running Android 11. A “device implementation” or “implementation" is the hardware/software solution so developed.

To be considered compatible with Android 11, device implementations MUST meet the requirements presented in this Compatibility Definition, including any documents incorporated via reference.

Where this definition or the software tests described in section 10 is silent, ambiguous, or incomplete, it is the responsibility of the device implementer to ensure compatibility with existing implementations.

For this reason, the Android Open Source Project is both the reference and preferred implementation of Android. Device implementers are STRONGLY RECOMMENDED to base their implementations to the greatest extent possible on the “upstream” source code available from the Android Open Source Project. While some components can hypothetically be replaced with alternate implementations, it is STRONGLY RECOMMENDED to not follow this practice, as passing the software tests will become substantially more difficult. It is the implementer’s responsibility to ensure full behavioral compatibility with the standard Android implementation, including and beyond the Compatibility Test Suite. Finally, note that certain component substitutions and modifications are explicitly forbidden by this document.

Many of the resources linked to in this document are derived directly or indirectly from the Android SDK and will be functionally identical to the information in that SDK’s documentation. In any cases where this Compatibility Definition or the Compatibility Test Suite disagrees with the SDK documentation, the SDK documentation is considered authoritative. Any technical details provided in the linked resources throughout this document are considered by inclusion to be part of this Compatibility Definition.

1.1 Document Structure

1.1.1. Requirements by Device Type

Section 2 contains all of the requirements that apply to a specific device type. Each subsection of Section 2 is dedicated to a specific device type.

All the other requirements, that universally apply to any Android device implementations, are listed in the sections after Section 2. These requirements are referenced as "Core Requirements" in this document.

1.1.2. Requirement ID

Requirement ID is assigned for MUST requirements.

• The ID is assigned for MUST requirements only.
• STRONGLY RECOMMENDED requirements are marked as [SR] but ID is not assigned.
• The ID consists of : Device Type ID - Condition ID - Requirement ID (e.g. C-0-1).

Each ID is defined as below:

• Device Type ID (see more in 2. Device Types)
  • C: Core (Requirements that are applied to any Android device implementations)
  • H: Android Handheld device
  • T: Android Television device
  • A: Android Automotive implementation
  • W: Android Watch implementation
  • Tab: Android Tablet implementation
• Condition ID
  • When the requirement is unconditional, this ID is set as 0.
  • When the requirement is conditional, 1 is assigned for the 1st condition and the number increments by 1 within the same section and the same device type.
• Requirement ID
  • This ID starts from 1 and increments by 1 within the same section and the same condition.

1.1.3. Requirement ID in Section 2

The Requirement ID in Section 2 starts with the corresponding section ID that is followed by the Requirement ID described above.

• The ID in Section 2 consists of : Section ID / Device Type ID - Condition ID - Requirement ID (e.g. 7.4.3/A-0-1).

2. Device Types

While the Android Open Source Project provides a software stack that can be used for a variety of device types and form factors, there are a few device types that have a relatively better established application distribution ecosystem.

This section describes those device types, and additional requirements and recommendations applicable for each device type.

All Android device implementations that do not fit into any of the described device types MUST still meet all requirements in the other sections of this Compatibility Definition.

2.1 Device Configurations

For the major differences in hardware configuration by device type, see the device-specific requirements that follow in this section.

2.2. Handheld Requirements

An Android Handheld device refers to an Android device implementation that is typically used by holding it in the hand, such as an mp3 player, phone, or tablet.

Android device implementations are classified as a Handheld if they meet all the following criteria:

• Have a power source that provides mobility, such as a battery.
• Have a physical diagonal screen size in the range of 3.3 inches (or 2.5 inches for devices which launched on an API level earlier than Android 11) to 8 inches.

The additional requirements in the rest of this section are specific to Android Handheld device implementations.

2.2.1. Hardware

Handheld device implementations:

• [7.1.1.1/H-0-1] MUST have at least one Android-compatible display that meets all requirements described on this document.
• [7.1.1.3/H-SR] Are STRONGLY RECOMMENDED to provide users an affordance to change the display size (screen density).

If Handheld device implementations support software screen rotation, they:

• [7.1.1.1/H-1-1]* MUST make the logical screen that is made available for third party applications be at least 2 inches on the short edge(s) and 2.7 inches on the long edge(s). Devices which launched on an API level earlier than that of this document are exempted from this requirement.

If Handheld device implementations do not support software screen rotation, they:

• [7.1.1.1/H-2-1]* MUST make the logical screen that is made available for third party applications be at least 2.7 inches on the short edge(s). Devices which launched on an API level earlier than that of this document are exempted from this requirement.

If Handheld device implementations claim support for high dynamic range displays through , they:

• [7.1.4.5/H-1-1] MUST advertise support for the , , , , and extensions.

Handheld device implementations:

• [7.1.4.6/H-0-1] MUST report whether the device supports the GPU profiling capability via a system property .

If Handheld device implementations declare support via a system property , they:

Handheld device implementations:

• [7.1.5/H-0-1] MUST include support for legacy application compatibility mode as implemented by the upstream Android open source code. That is, device implementations MUST NOT alter the triggers or thresholds at which compatibility mode is activated, and MUST NOT alter the behavior of the compatibility mode itself.
• [7.2.1/H-0-1] MUST include support for third-party Input Method Editor (IME) applications.
• [7.2.3/H-0-3] MUST provide the Home function on all the Android-compatible displays that provide the home screen.
• [7.2.3/H-0-4] MUST provide the Back function on all the Android-compatible displays and the Recents function on at least one of the Android-compatible displays.
• [7.2.3/H-0-2] MUST send both the normal and long press event of the Back function () to the foreground application. These events MUST NOT be consumed by the system and CAN be triggered by outside of the Android device (e.g. external hardware keyboard connected to the Android device).
• [7.2.4/H-0-1] MUST support touchscreen input.
• [7.2.4/H-SR] Are STRONGLY RECOMMENDED to launch the user-selected assist app, in other words the app that implements VoiceInteractionService, or an activity handling the on long-press of or if the foreground activity does not handle those long-press events.
• [7.3.1/H-SR] Are STRONGLY RECOMMENDED to include a 3-axis accelerometer.

If Handheld device implementations include a 3-axis accelerometer, they:

• [7.3.1/H-1-1] MUST be able to report events up to a frequency of at least 100 Hz.

If Handheld device implementations include a GPS/GNSS receiver and report the capability to applications through the feature flag, they:

• [7.3.3/H-2-1] MUST report GNSS measurements, as soon as they are found, even if a location calculated from GPS/GNSS is not yet reported.
• [7.3.3/H-2-2] MUST report GNSS pseudoranges and pseudorange rates, that, in open-sky conditions after determining the location, while stationary or moving with less than 0.2 meter per second squared of acceleration, are sufficient to calculate position within 20 meters, and speed within 0.2 meters per second, at least 95% of the time.

If Handheld device implementations include a 3-axis gyroscope, they:

• [7.3.4/H-3-1] MUST be able to report events up to a frequency of at least 100 Hz.
• [7.3.4/H-3-2] MUST be capable of measuring orientation changes up to 1000 degrees per second.

Handheld device implementations that can make a voice call and indicate any value other than in :

• [7.3.8/H] SHOULD include a proximity sensor.

Handheld device implementations:

• [7.3.11/H-SR] Are RECOMMENDED to support pose sensor with 6 degrees of freedom.
• [7.4.3/H] SHOULD include support for Bluetooth and Bluetooth LE.

If Handheld device implementations include a metered connection, they:

• [7.4.7/H-1-1] MUST provide the data saver mode.

If Handheld device implementations include a logical camera device that lists capabilities using , they:

• [7.5.4/H-1-1] MUST have normal field of view (FOV) by default and it MUST be between 50 and 90 degrees.

Handheld device implementations:

• [7.6.1/H-0-1] MUST have at least 4 GB of non-volatile storage available for application private data (a.k.a. "/data" partition).
• [7.6.1/H-0-2] MUST return “true” for when there is less than 1GB of memory available to the kernel and userspace.

If Handheld device implementations declare support of only a 32-bit ABI:

• [7.6.1/H-1-1] The memory available to the kernel and userspace MUST be at least 416MB if the default display uses framebuffer resolutions up to qHD (e.g. FWVGA).

• [7.6.1/H-2-1] The memory available to the kernel and userspace MUST be at least 592MB if the default display uses framebuffer resolutions up to HD+ (e.g. HD, WSVGA).

• [7.6.1/H-3-1] The memory available to the kernel and userspace MUST be at least 896MB if the default display uses framebuffer resolutions up to FHD (e.g. WSXGA+).

• [7.6.1/H-4-1] The memory available to the kernel and userspace MUST be at least 1344MB if the default display uses framebuffer resolutions up to QHD (e.g. QWXGA).

If Handheld device implementations declare support of 32-bit and 64-bit ABIs:

• [7.6.1/H-5-1] The memory available to the kernel and userspace MUST be at least 816MB if the default display uses framebuffer resolutions up to qHD (e.g. FWVGA).

• [7.6.1/H-6-1] The memory available to the kernel and userspace MUST be at least 944MB if the default display uses framebuffer resolutions up to HD+ (e.g. HD, WSVGA).

• [7.6.1/H-7-1] The memory available to the kernel and userspace MUST be at least 1280MB if the default display uses framebuffer resolutions up to FHD (e.g. WSXGA+).

• [7.6.1/H-8-1] The memory available to the kernel and userspace MUST be at least 1824MB if the default display uses framebuffer resolutions up to QHD (e.g. QWXGA).

Note that the "memory available to the kernel and userspace" above refers to the memory space provided in addition to any memory already dedicated to hardware components such as radio, video, and so on that are not under the kernel’s control on device implementations.

If Handheld device implementations include less than or equal to 1GB of memory available to the kernel and userspace, they:

• [7.6.1/H-9-1] MUST declare the feature flag .
• [7.6.1/H-9-2] MUST have at least 1.1 GB of non-volatile storage for application private data (a.k.a. "/data" partition).

If Handheld device implementations include more than 1GB of memory available to the kernel and userspace, they:

• [7.6.1/H-10-1] MUST have at least 4GB of non-volatile storage available for application private data (a.k.a. "/data" partition).
• SHOULD declare the feature flag .

Handheld device implementations:

• [7.6.2/H-0-1] MUST NOT provide an application shared storage smaller than 1 GiB.
• [7.7.1/H] SHOULD include a USB port supporting peripheral mode.

If handheld device implementations include a USB port supporting peripheral mode, they:

• [7.7.1/H-1-1] MUST implement the Android Open Accessory (AOA) API.

If Handheld device implementations include a USB port supporting host mode, they:

• [7.7.2/H-1-1] MUST implement the USB audio class as documented in the Android SDK documentation.

Handheld device implementations:

• [7.8.1/H-0-1] MUST include a microphone.
• [7.8.2/H-0-1] MUST have an audio output and declare .

If Handheld device implementations are capable of meeting all the performance requirements for supporting VR mode and include support for it, they:

• [7.9.1/H-1-1] MUST declare the feature flag.
• [7.9.1/H-1-2] MUST include an application implementing that can be enabled by VR applications via .

If Handheld device implementations include one or more USB-C port(s) in host mode and implement (USB audio class), in addition to requirements in section 7.7.2, they:

• [7.8.2.2/H-1-1] MUST provide the following software mapping of HID codes:

• [7.8.2.2/H-1-2] MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after the USB audio interfaces and endpoints have been properly enumerated in order to identify the type of terminal connected.

When the USB audio terminal types 0x0302 is detected, they:

• [7.8.2.2/H-2-1] MUST broadcast Intent ACTION_HEADSET_PLUG with "microphone" extra set to 0.

When the USB audio terminal types 0x0402 is detected, they:

• [7.8.2.2/H-3-1] MUST broadcast Intent ACTION_HEADSET_PLUG with "microphone" extra set to 1.

When API AudioManager.getDevices() is called while the USB peripheral is connected they:

• [7.8.2.2/H-4-1] MUST list a device of type AudioDeviceInfo.TYPE_USB_HEADSET and role isSink() if the USB audio terminal type field is 0x0302.

• [7.8.2.2/H-4-2] MUST list a device of type AudioDeviceInfo.TYPE_USB_HEADSET and role isSink() if the USB audio terminal type field is 0x0402.

• [7.8.2.2/H-4-3] MUST list a device of type AudioDeviceInfo.TYPE_USB_HEADSET and role isSource() if the USB audio terminal type field is 0x0402.

• [7.8.2.2/H-4-4] MUST list a device of type AudioDeviceInfo.TYPE_USB_DEVICE and role isSink() if the USB audio terminal type field is 0x603.

• [7.8.2.2/H-4-5] MUST list a device of type AudioDeviceInfo.TYPE_USB_DEVICE and role isSource() if the USB audio terminal type field is 0x604.

• [7.8.2.2/H-4-6] MUST list a device of type AudioDeviceInfo.TYPE_USB_DEVICE and role isSink() if the USB audio terminal type field is 0x400.

• [7.8.2.2/H-4-7] MUST list a device of type AudioDeviceInfo.TYPE_USB_DEVICE and role isSource() if the USB audio terminal type field is 0x400.

• [7.8.2.2/H-SR] Are STRONGLY RECOMMENDED upon connection of a USB-C audio peripheral, to perform enumeration of USB descriptors, identify terminal types and broadcast Intent ACTION_HEADSET_PLUG in less than 1000 milliseconds.

If Handheld device implementations include at least one haptic actuator, they:

• [7.10/H-SR]* Are STRONGLY RECOMMENDED NOT to use an eccentric rotating mass (ERM) haptic actuator(vibrator).
• [7.10/H]* SHOULD position the placement of the actuator near the location where the device is typically held or touched by hands.
• [7.10/H-SR]* Are STRONGLY RECOMMENDED to implement all public constants for clear haptics in android.view.HapticFeedbackConstants namely (CLOCK_TICK, CONTEXT_CLICK, KEYBOARD_PRESS, KEYBOARD_RELEASE, KEYBOARD_TAP, LONG_PRESS, TEXT_HANDLE_MOVE, VIRTUAL_KEY, VIRTUAL_KEY_RELEASE, CONFIRM, REJECT, GESTURE_START and GESTURE_END).
• [7.10/H-SR]* Are STRONGLY RECOMMENDED to implement all public constants for clear haptics in android.os.VibrationEffect namely (EFFECT_TICK, EFFECT_CLICK, EFFECT_HEAVY_CLICK and EFFECT_DOUBLE_CLICK) and all public constants for rich haptics in android.os.VibrationEffect.Composition namely (PRIMITIVE_CLICK and PRIMITIVE_TICK).
• [7.10/H-SR]* Are STRONGLY RECOMMENDED to use these linked haptic constants mappings.
• [7.10/H-SR]* Are STRONGLY RECOMMENDED to follow quality assessment for createOneShot() and createWaveform() API's.
• [7.10/H-SR]* Are STRONGLY RECOMMENDED to verify the capabilities for amplitude scalability by running android.os.Vibrator.hasAmplitudeControl().

Linear resonant actuator (LRA) is a single mass spring system which has a dominant resonant frequency where the mass translates in the direction of desired motion.

If Handheld device implementations include at least one linear resonant actuator, they:

• [7.10/H]* SHOULD move the haptic actuator in the X-axis of portrait orientation.

If Handheld device implementations have a haptic actuator which is X-axis Linear resonant actuator (LRA), they:

• [7.10/H-SR]* Are STRONGLY RECOMMENDED to have the resonant frequency of the X-axis LRA be under 200 Hz.

If handheld device implementations follow haptic constants mapping, they:

2.2.2. Multimedia

Handheld device implementations MUST support the following audio encoding and decoding formats and make them available to third-party applications:

• [5.1/H-0-1] AMR-NB
• [5.1/H-0-2] AMR-WB
• [5.1/H-0-3] MPEG-4 AAC Profile (AAC LC)
• [5.1/H-0-4] MPEG-4 HE AAC Profile (AAC+)
• [5.1/H-0-5] AAC ELD (enhanced low delay AAC)

Handheld device implementations MUST support the following video encoding formats and make them available to third-party applications:

• [5.2/H-0-1] H.264 AVC
• [5.2/H-0-2] VP8

Handheld device implementations MUST support the following video decoding formats and make them available to third-party applications:

• [5.3/H-0-1] H.264 AVC
• [5.3/H-0-2] H.265 HEVC
• [5.3/H-0-3] MPEG-4 SP
• [5.3/H-0-4] VP8
• [5.3/H-0-5] VP9

2.2.3. Software

Handheld device implementations:

• [3.2.3.1/H-0-1] MUST have an application that handles the , , , and intents as described in the SDK documents, and provide the user affordance to access the document provider data by using API.
• [3.2.3.1/H-0-2]* MUST preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here.
• [3.2.3.1/H-SR] Are STRONGLY RECOMMENDED to preload an email application which can handle ACTION_SENDTO or ACTION_SEND or ACTION_SEND_MULTIPLE intents to send an email.
• [3.4.1/H-0-1] MUST provide a complete implementation of the API.
• [3.4.2/H-0-1] MUST include a standalone Browser application for general user web browsing.
• [3.8.1/H-SR] Are STRONGLY RECOMMENDED to implement a default launcher that supports in-app pinning of shortcuts, widgets and widgetFeatures.
• [3.8.1/H-SR] Are STRONGLY RECOMMENDED to implement a default launcher that provides quick access to the additional shortcuts provided by third-party apps through the ShortcutManager API.
• [3.8.1/H-SR] Are STRONGLY RECOMMENDED to include a default launcher app that shows badges for the app icons.
• [3.8.2/H-SR] Are STRONGLY RECOMMENDED to support third-party app widgets.
• [3.8.3/H-0-1] MUST allow third-party apps to notify users of notable events through the and API classes.
• [3.8.3/H-0-2] MUST support rich notifications.
• [3.8.3/H-0-3] MUST support heads-up notifications.
• [3.8.3/H-0-4] MUST include a notification shade, providing the user the ability to directly control (e.g. reply, snooze, dismiss, block) the notifications through user affordance such as action buttons or the control panel as implemented in the AOSP.
• [3.8.3/H-0-5] MUST display the choices provided through in the notification shade.
• [3.8.3/H-SR] Are STRONGLY RECOMMENDED to display the first choice provided through in the notification shade without additional user interaction.
• [3.8.3/H-SR] Are STRONGLY RECOMMENDED to display all the choices provided through in the notification shade when the user expands all notifications in the notification shade.
• [3.8.3.1/H-SR] Are STRONGLY RECOMMENDED to display actions for which is set as in-line with the replies displayed by .
• [3.8.4/H-SR] Are STRONGLY RECOMMENDED to implement an assistant on the device to handle the Assist action.

If Handheld device implementations support Assist action, they:

• [3.8.4/H-SR] Are STRONGLY RECOMMENDED to use long press on key as the designated interaction to launch the assist app as described in section 7.2.3. MUST launch the user-selected assist app, in other words the app that implements , or an activity handling the intent.

If Handheld device implementations support and group them into a separate section from alerting and silent non-conversation notifications, they:

• [3.8.4/H-1-1]* MUST display conversation notifications ahead of non conversation notifications with the exception of ongoing foreground service notifications and importance:high notifications.

If Android Handheld device implementations support a lock screen, they:

• [3.8.10/H-1-1] MUST display the Lock screen Notifications including the Media Notification Template.

If Handheld device implementations support a secure lock screen, they:

• [3.9/H-1-1] MUST implement the full range of device administration policies defined in the Android SDK documentation.
• [3.9/H-1-2] MUST declare the support of managed profiles via the feature flag, except when the device is configured so that it would report itself as a low RAM device or so that it allocates internal (non-removable) storage as shared storage.

If Handheld device implementations include support for and APIs and allow third-party applications to publish , then they:

• [3.8.16/H-1-1] MUST declare the feature flag and set it to .
• [3.8.16/H-1-2] MUST provide a user affordance with the ability to add, edit, select, and operate the user’s favorite device controls from the controls registered by the third-party applications through the and the APIs.
• [3.8.16/H-1-3] MUST provide access to this user affordance within three interactions from a default Launcher.
• [3.8.16/H-1-4] MUST accurately render in this user affordance the name and icon of each third-party app that provides controls via the API as well as any specified fields provided by the APIs.

Conversely, If Handheld device implementations do not implement such controls, they:

Handheld device implementations:

• [3.10/H-0-1] MUST support third-party accessibility services.
• [3.10/H-SR] Are STRONGLY RECOMMENDED to preload accessibility services on the device comparable with or exceeding functionality of the Switch Access and TalkBack (for languages supported by the preinstalled Text-to-speech engine) accessibility services as provided in the talkback open source project.
• [3.11/H-0-1] MUST support installation of third-party TTS engines.
• [3.11/H-SR] Are STRONGLY RECOMMENDED to include a TTS engine supporting the languages available on the device.
• [3.13/H-SR] Are STRONGLY RECOMMENDED to include a Quick Settings UI component.

If Android handheld device implementations declare or support, they:

• [3.16/H-1-1] MUST support the companion device pairing feature.

If the navigation function is provided as an on-screen, gesture-based action:

• [7.2.3/H] The gesture recognition zone for the Home function SHOULD be no higher than 32 dp in height from the bottom of the screen.

If Handheld device implementations provide a navigation function as a gesture from anywhere on the left and right edges of the screen:

• [7.2.3/H-0-1] The navigation function's gesture area MUST be less than 40 dp in width on each side. The gesture area SHOULD be 24 dp in width by default.

2.2.4. Performance and Power

• [8.1/H-0-1] Consistent frame latency. Inconsistent frame latency or a delay to render frames MUST NOT happen more often than 5 frames in a second, and SHOULD be below 1 frames in a second.
• [8.1/H-0-2] User interface latency. Device implementations MUST ensure low latency user experience by scrolling a list of 10K list entries as defined by the Android Compatibility Test Suite (CTS) in less than 36 secs.
• [8.1/H-0-3] Task switching. When multiple applications have been launched, re-launching an already-running application after it has been launched MUST take less than 1 second.

Handheld device implementations:

• [8.2/H-0-1] MUST ensure a sequential write performance of at least 5 MB/s.
• [8.2/H-0-2] MUST ensure a random write performance of at least 0.5 MB/s.
• [8.2/H-0-3] MUST ensure a sequential read performance of at least 15 MB/s.
• [8.2/H-0-4] MUST ensure a random read performance of at least 3.5 MB/s.

If Handheld device implementations include features to improve device power management that are included in AOSP or extend the features that are included in AOSP, they:

• [8.3/H-1-1] MUST provide user affordance to enable and disable the battery saver feature.
• [8.3/H-1-2] MUST provide user affordance to display all apps that are exempted from App Standby and Doze power-saving modes.

Handheld device implementations:

• [8.4/H-0-1] MUST provide a per-component power profile that defines the current consumption value for each hardware component and the approximate battery drain caused by the components over time as documented in the Android Open Source Project site.
• [8.4/H-0-2] MUST report all power consumption values in milliampere hours (mAh).
• [8.4/H-0-3] MUST report CPU power consumption per each process's UID. The Android Open Source Project meets the requirement through the kernel module implementation.
• [8.4/H-0-4] MUST make this power usage available via the shell command to the app developer.
• [8.4/H] SHOULD be attributed to the hardware component itself if unable to attribute hardware component power usage to an application.

If Handheld device implementations include a screen or video output, they:

2.2.5. Security Model

Handheld device implementations:

• [9.1/H-0-1] MUST allow third-party apps to access the usage statistics via the permission and provide a user-accessible mechanism to grant or revoke access to such apps in response to the intent.

Handheld device implementations (* Not applicable for Tablet):

• [9.11/H-0-2]* MUST back up the keystore implementation with an isolated execution environment.
• [9.11/H-0-3]* MUST have implementations of RSA, AES, ECDSA, and HMAC cryptographic algorithms and MD5, SHA1, and SHA-2 family hash functions to properly support the Android Keystore system's supported algorithms in an area that is securely isolated from the code running on the kernel and above. Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. The upstream Android Open Source Project (AOSP) meets this requirement by using the Trusty implementation, but another ARM TrustZone-based solution or a third-party reviewed secure implementation of a proper hypervisor-based isolation are alternative options.
• [9.11/H-0-4]* MUST perform the lock screen authentication in the isolated execution environment and only when successful, allow the authentication-bound keys to be used. Lock screen credentials MUST be stored in a way that allows only the isolated execution environment to perform lock screen authentication. The upstream Android Open Source Project provides the Gatekeeper Hardware Abstraction Layer (HAL) and Trusty, which can be used to satisfy this requirement.
• [9.11/H-0-5]* MUST support key attestation where the attestation signing key is protected by secure hardware and signing is performed in secure hardware. The attestation signing keys MUST be shared across large enough number of devices to prevent the keys from being used as device identifiers. One way of meeting this requirement is to share the same attestation key unless at least 100,000 units of a given SKU are produced. If more than 100,000 units of an SKU are produced, a different key MAY be used for each 100,000 units.

Note that if a device implementation is already launched on an earlier Android version, such a device is exempted from the requirement to have a keystore backed by an isolated execution environment and support the key attestation, unless it declares the feature which requires a keystore backed by an isolated execution environment.

When Handheld device implementations support a secure lock screen, they:

• [9.11/H-1-1] MUST allow the user to choose the shortest sleep timeout, that is a transition time from the unlocked to the locked state, as 15 seconds or less.
• [9.11/H-1-2] MUST provide user affordance to hide notifications and disable all forms of authentication except for the primary authentication described in 9.11.1 Secure Lock Screen. The AOSP meets the requirement as lockdown mode.

2.2.6. Developer Tools and Options Compatibility

Handheld device implementations (* Not applicable for Tablet):

• [6.1/H-0-1]* MUST support the shell command .

Handheld device implementations (* Not applicable for Tablet):

• Perfetto
  • [6.1/H-0-2]* MUST expose a binary to the shell user which cmdline complies with the perfetto documentation.
  • [6.1/H-0-3]* The perfetto binary MUST accept as input a protobuf config that complies with the schema defined in the perfetto documentation.
  • [6.1/H-0-4]* The perfetto binary MUST write as output a protobuf trace that complies with the schema defined in the perfetto documentation.
  • [6.1/H-0-5]* MUST provide, through the perfetto binary, at least the data sources described in the perfetto documentation.
  • [6.1/H-0-6]* The perfetto traced daemon MUST be enabled by default (system property ).

2.3. Television Requirements

An Android Television device refers to an Android device implementation that is an entertainment interface for consuming digital media, movies, games, apps, and/or live TV for users sitting about ten feet away (a “lean back” or “10-foot user interface”).

Android device implementations are classified as a Television if they meet all the following criteria:

• Have provided a mechanism to remotely control the rendered user interface on the display that might sit ten feet away from the user.
• Have an embedded screen display with the diagonal length larger than 24 inches OR include a video output port, such as VGA, HDMI, DisplayPort, or a wireless port for display.

The additional requirements in the rest of this section are specific to Android Television device implementations.

2.3.1. Hardware

Television device implementations:

• [7.2.2/T-0-1] MUST support D-pad.
• [7.2.3/T-0-1] MUST provide the Home and Back functions.
• [7.2.3/T-0-2] MUST send both the normal and long press event of the Back function () to the foreground application.
• [7.2.6.1/T-0-1] MUST include support for game controllers and declare the feature flag.
• [7.2.7/T] SHOULD provide a remote control from which users can access non-touch navigation and core navigation keys inputs.

If Television device implementations include a 3-axis gyroscope, they:

• [7.3.4/T-1-1] MUST be able to report events up to a frequency of at least 100 Hz.
• [7.3.4/T-1-2] MUST be capable of measuring orientation changes up to 1000 degrees per second.

Television device implementations:

• [7.4.3/T-0-1] MUST support Bluetooth and Bluetooth LE.
• [7.6.1/T-0-1] MUST have at least 4 GB of non-volatile storage available for application private data (a.k.a. "/data" partition).

If Television device implementations include a USB port that supports host mode, they:

• [7.5.3/T-1-1] MUST include support for an external camera that connects through this USB port but is not necessarily always connected.

If TV device implementations are 32-bit:

• [7.6.1/T-1-1] The memory available to the kernel and userspace MUST be at least 896MB if any of the following densities are used:

  • 400dpi or higher on small/normal screens
  • xhdpi or higher on large screens
  • tvdpi or higher on extra large screens

If TV device implementations are 64-bit:

• [7.6.1/T-2-1] The memory available to the kernel and userspace MUST be at least 1280MB if any of the following densities are used:

  • 400dpi or higher on small/normal screens
  • xhdpi or higher on large screens
  • tvdpi or higher on extra large screens

Note that the "memory available to the kernel and userspace" above refers to the memory space provided in addition to any memory already dedicated to hardware components such as radio, video, and so on that are not under the kernel’s control on device implementations.

Television device implementations:

• [7.8.1/T] SHOULD include a microphone.
• [7.8.2/T-0-1] MUST have an audio output and declare .

2.3.2. Multimedia

Television device implementations MUST support the following audio encoding and decoding formats and make them available to third-party applications:

• [5.1/T-0-1] MPEG-4 AAC Profile (AAC LC)
• [5.1/T-0-2] MPEG-4 HE AAC Profile (AAC+)
• [5.1/T-0-3] AAC ELD (enhanced low delay AAC)

Television device implementations MUST support the following video encoding formats and make them available to third-party applications:

• [5.2/T-0-1] H.264
• [5.2/T-0-2] VP8

Television device implementations:

• [5.2.2/T-SR] Are STRONGLY RECOMMENDED to support H.264 encoding of 720p and 1080p resolution videos at 30 frames per second.

Television device implementations MUST support the following video decoding formats and make them available to third-party applications:

Television device implementations MUST support MPEG-2 decoding, as detailed in Section 5.3.1, at standard video frame rates and resolutions up to and including:

• [5.3.1/T-1-1] HD 1080p at 59.94 frames per second with Main Profile High Level.
• [5.3.1/T-1-2] HD 1080i at 59.94 frames per second with Main Profile High Level. They MUST deinterlace interlaced MPEG-2 video to its progressive equivalent (e.g. from 1080i at 59.94 frames per second to 1080p at 29.97 frames per second) and make it available to third-party applications.

Television device implementations MUST support H.264 decoding, as detailed in Section 5.3.4, at standard video frame rates and resolutions up to and including:

• [5.3.4/T-1-1] HD 1080p at 60 frames per second with Baseline Profile
• [5.3.4/T-1-2] HD 1080p at 60 frames per second with Main Profile
• [5.3.4/T-1-3] HD 1080p at 60 frames per second with High Profile Level 4.2

Television device implementations with H.265 hardware decoders MUST support H.265 decoding, as detailed in Section 5.3.5, at standard video frame rates and resolutions up to and including:

• [5.3.5/T-1-1] HD 1080p at 60 frames per second with Main Profile Level 4.1

If Television device implementations with H.265 hardware decoders support H.265 decoding and the UHD decoding profile, they:

• [5.3.5/T-2-1] MUST support UHD 3480p at 60 frames per second with Main10 Level 5 Main Tier profile

Television device implementations MUST support VP8 decoding, as detailed in Section 5.3.6, at standard video frame rates and resolutions up to and including:

• [5.3.6/T-1-1] HD 1080p at 60 frames per second decoding profile

Television device implementations with VP9 hardware decoders MUST support VP9 decoding, as detailed in Section 5.3.7, at standard video frame rates and resolutions up to and including:

• [5.3.7/T-1-1] HD 1080p at 60 frames per second with profile 0 (8 bit color depth)

If Television device implementations with VP9 hardware decoders support VP9 decoding and the UHD decoding profile, they:

• [5.3.7/T-2-1] MUST support UHD 3480p at 60 frames per second with profile 0 (8 bit color depth).
• [5.3.7/T-2-1] Are STRONGLY RECOMMENDED to support UHD 3480p at 60 frames per second with profile 2 (10 bit color depth).

Television device implementations:

• [5.5/T-0-1] MUST include support for system Master Volume and digital audio output volume attenuation on supported outputs, except for compressed audio passthrough output (where no audio decoding is done on the device).

If Television device implementations do not have a built in display, but instead support an external display connected via HDMI, they:

• [5.8/T-0-1] MUST set the HDMI output mode to select the maximum resolution that can be supported with either a 50Hz or 60Hz refresh rate.
• [5.8/T-SR] Are STRONGLY RECOMMENDED to provide a user configurable HDMI refresh rate selector.
• [5.8] SHOULD set the HDMI output mode refresh rate to either 50Hz or 60Hz, depending on the video refresh rate for the region the device is sold in.

If Television device implementations do not have a built in display, but instead support an external display connected via HDMI, they:

• [5.8/T-1-1] MUST support HDCP 2.2.

If Television device implementations do not support UHD decoding, but instead support an external display connected via HDMI, they:

• [5.8/T-2-1] MUST support HDCP 1.4

2.3.3. Software

Television device implementations:

• [3/T-0-1] MUST declare the features and .
• [3.2.3.1/T-0-1] MUST preload one or more applications or service components with an intent handler, for all the public intent filter patterns defined by the following application intents listed here.
• [3.4.1/T-0-1] MUST provide a complete implementation of the API.

If Android Television device implementations support a lock screen,they:

• [3.8.10/T-1-1] MUST display the Lock screen Notifications including the Media Notification Template.

Television device implementations:

• [3.8.14/T-SR] Are STRONGLY RECOMMENDED to support picture-in-picture (PIP) mode multi-window.
• [3.10/T-0-1] MUST support third-party accessibility services.
• [3.10/T-SR] Are STRONGLY RECOMMENDED to preload accessibility services on the device comparable with or exceeding functionality of the Switch Access and TalkBack (for languages supported by the preinstalled Text-to-speech engine) accessibility services as provided in the talkback open source project.

If Television device implementations report the feature , they:

• [3.11/T-SR] Are STRONGLY RECOMMENDED to include a TTS engine supporting the languages available on the device.
• [3.11/T-1-1] MUST support installation of third-party TTS engines.

Television device implementations:

• [3.12/T-0-1] MUST support TV Input Framework.

2.3.4. Performance and Power

• [8.1/T-0-1] Consistent frame latency. Inconsistent frame latency or a delay to render frames MUST NOT happen more often than 5 frames in a second, and SHOULD be below 1 frames in a second.
• [8.2/T-0-1] MUST ensure a sequential write performance of at least 5MB/s.
• [8.2/T-0-2] MUST ensure a random write performance of at least 0.5MB/s.
• [8.2/T-0-3] MUST ensure a sequential read performance of at least 15MB/s.
• [8.2/T-0-4] MUST ensure a random read performance of at least 3.5MB/s.

If Television device implementations include features to improve device power management that are included in AOSP or extend the features that are included in AOSP, they:

• [8.3/T-1-1] MUST provide user affordance to enable and disable the battery saver feature.

If Television device implementations do not have a battery they:

If Television device implementations have a battery they:

• [8.3/T-1-3] MUST provide user affordance to display all apps that are exempted from App Standby and Doze power-saving modes.

Television device implementations:

• [8.4/T-0-1] MUST provide a per-component power profile that defines the current consumption value for each hardware component and the approximate battery drain caused by the components over time as documented in the Android Open Source Project site.
• [8.4/T-0-2] MUST report all power consumption values in milliampere hours (mAh).
• [8.4/T-0-3] MUST report CPU power consumption per each process's UID. The Android Open Source Project meets the requirement through the kernel module implementation.
• [8.4/T] SHOULD be attributed to the hardware component itself if unable to attribute hardware component power usage to an application.
• [8.4/T-0-4] MUST make this power usage available via the shell command to the app developer.

2.3.5. Security Model

Television device implementations:

• [9.11/T-0-1] MUST back up the keystore implementation with an isolated execution environment.
• [9.11/T-0-2] MUST have implementations of RSA, AES, ECDSA and HMAC cryptographic algorithms and MD5, SHA1, and SHA-2 family hash functions to properly support the Android Keystore system's supported algorithms in an area that is securely isolated from the code running on the kernel and above. Secure isolation MUST block all potential mechanisms by which kernel or userspace code might access the internal state of the isolated environment, including DMA. The upstream Android Open Source Project (AOSP) meets this requirement by using the Trusty implementation, but another ARM TrustZone-based solution or a third-party reviewed secure implementation of a proper hypervisor-based isolation are alternative options.
• [9.11/T-0-3] MUST perform the lock screen authentication in the isolated execution environment and only when successful, allow the authentication-bound keys to be used. Lock screen credentials MUST be stored in a way that allows only the isolated execution environment to perform lock screen authentication. The upstream Android Open Source Project provides the Gatekeeper Hardware Abstraction Layer (HAL) and Trusty, which can be used to satisfy this requirement.
• [9.11/T-0-4] MUST support key attestation where the attestation signing key is protected by secure hardware and signing is performed in secure hardware. The attestation signing keys MUST be shared across large enough number of devices to prevent the keys from being used as device identifiers. One way of meeting this requirement is to share the same attestation key unless at least 100,000 units of a given SKU are produced. If more than 100,000 units of an SKU are produced, a different key MAY be used for each 100,000 units.

Note that if a device implementation is already launched on an earlier Android version, such a device is exempted from the requirement to have a keystore backed by an isolated execution environment and support the key attestation, unless it declares the feature which requires a keystore backed by an isolated execution environment.

If Television device implementations support a secure lock screen, they:

• [9.11/T-1-1] MUST allow the user to choose the Sleep timeout for transition from the unlocked to the locked state, with a minimum allowable timeout up to 15 seconds or less.

2.3.6. Developer Tools and Options Compatibility

Television device implementations: