Xiaomi Redmi Note 8 Pro 64Gb+6Gb Dual LTE [6/132] Introduction

1. Introduction

This document enumerates the requirements that must be met in order for devices to be compatible

with Android 9.

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 9. A “device implementation” or

“implementation" is the hardware/software solution so developed.

To be considered compatible with Android 9, 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 are 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

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