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A/B(シームレス)システム アップデート コレクションでコンテンツを整理 必要に応じて、コンテンツの保存と分類を行います。 A/B システム アップデートはシームレス アップデートとも呼ばれています。このアップデートにより、実行可能な起動システムが無線(OTA)アップデート中もディスク上に残ります。この方法では、アップデート後のデバイスが動作しなくなる可能性が低くなるため、修理保証センターでのデバイスの交換や修理の回数が少なくなります。ChromeOS などのその他の業務用オペレーティング システムでも A/B アップデートは問題なく使用されています。 A/B システム アップデートとその動作の詳細については、パーティションの選択(スロット)をご覧ください。 A/B システム アップデートには次のようなメリットがあります。 OTA アップデートは、システムの稼働中でも実行できるため、ユー
Implementing MAC Randomization Stay organized with collections Save and categorize content based on your preferences. Starting in Android 8.0, Android devices use randomized MAC addresses when probing for new networks while not currently associated with a network. In Android 9, you can enable a developer option (it's disabled by default) to cause the device to use a randomized MAC address when con
Android Security Bulletin — February 2019 Stay organized with collections Save and categorize content based on your preferences. Published February 4, 2019 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Security patch levels of 2019-02-05 or later address all of these issues. To learn how to check a device's security patch level, see Check and
Android Security Bulletin—November 2017 Stay organized with collections Save and categorize content based on your preferences. Published November 6, 2017 | Updated November 8, 2017 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Security patch levels of 2017-11-06 or later address all of these issues. To learn how to check a device's security p
Android Security Bulletin—September 2017 Stay organized with collections Save and categorize content based on your preferences. Published September 5, 2017 | Updated October 5, 2017 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Security patch levels of September 05, 2017 or later address all of these issues. Refer to the Pixel and Nexus updat
Android Security Bulletin—July 2017 Stay organized with collections Save and categorize content based on your preferences. Published July 5, 2017 | Updated September 26, 2017 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Security patch levels of July 05, 2017 or later address all of these issues. Refer to the Pixel and Nexus update schedule t
Keyboard devices Stay organized with collections Save and categorize content based on your preferences. Android supports a variety of keyboard devices including special function keypads (volume and power controls), compact embedded QWERTY keyboards, and fully featured PC-style external keyboards. This document describes physical keyboards only. Refer to the Android SDK for information about soft k
Debug ART garbage collection Stay organized with collections Save and categorize content based on your preferences. This page describes how to debug Android Runtime (ART) garbage collection (GC) correctness and performance issues. It explains how to use GC verification options, identify solutions for GC verification failures, and measure and address GC performance problems. To work with ART, see t
Android Security Bulletin—November 2016 Stay organized with collections Save and categorize content based on your preferences. Published November 07, 2016 | Updated December 21, 2016 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Alongside the bulletin, we have released a security update to Google devices through an over-the-air (OTA) update.
Android Security Bulletin—October 2016 Stay organized with collections Save and categorize content based on your preferences. Published October 03, 2016 | Updated October 04, 2016 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Alongside the bulletin, we have released a security update to Nexus devices through an over-the-air (OTA) update. The
Debug native Android platform code Stay organized with collections Save and categorize content based on your preferences. This section summarizes useful tools and related commands for debugging, tracing, and profiling native Android platform code when developing platform-level features. Note: The pages in this section and elsewhere within this site recommend the use of adb in conjunction with the
Android Security Bulletin—May 2016 Stay organized with collections Save and categorize content based on your preferences. Published May 02, 2016 | Updated May 04, 2016 The Android Security Bulletin contains details of security vulnerabilities affecting Android devices. Alongside the bulletin, we have released a security update to Nexus devices through an over-the-air (OTA) update. The Nexus firmwa
Android 14 Compatibility Definition Stay organized with collections Save and categorize content based on your preferences. 1. Introduction This document enumerates the requirements that must be met in order for devices to be compatible with Android 14. The use of "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" is per the IETF stand
Android Security Advisory — 2016-03-18 Stay organized with collections Save and categorize content based on your preferences. Published March 18, 2016 Android Security Advisories are supplemental to the Nexus Security Bulletins. Refer to our summary page for more information about Security Advisories. Summary Google has become aware of a rooting application using an unpatched local elevation of pr
What's new? Release notes Latest security bulletins Latest Compatibility Definition Document (CDD) Site updates Getting Started About Start Download Build Test Create Contribute Community Tools, build, and related reference Security Overview Bulletins Features Testing Best Practices Core Topics Architecture Audio Camera Connectivity Data Display Fonts Graphics Interaction Media Performance Permiss
Nexus Security Bulletin - December 2015 Stay organized with collections Save and categorize content based on your preferences. Published December 07, 2015 | Updated March 7, 2016 We have released a security update to Nexus devices through an over-the-air (OTA) update as part of our Android Security Bulletin Monthly Release process. The Nexus firmware images have also been released to the Google De
Compile with Jack (AOSP 6.0 - 8.1) Stay organized with collections Save and categorize content based on your preferences. Jack is the default Android build toolchain for Android 6.0 - 8.1 Jack is an Android toolchain that compiled Java source into Android dex bytecode. You don't have to do anything differently to use Jack - just use your standard makefile commands to compile the tree or your proje
Media Stay organized with collections Save and categorize content based on your preferences. Android includes Stagefright, a media playback engine at the native level that has built-in software-based codecs for popular media formats. Stagefright audio and video playback features include integration with OpenMAX codecs, session management, time-synchronized rendering, transport control, and DRM. St
Audio latency measurements Stay organized with collections Save and categorize content based on your preferences. Latency is an important system performance metric. While many kinds of audio latency metrics exist, one useful and well-understood metric is round-trip latency, defined as the time it takes for an audio signal to enter the input of a mobile device, be processed by an app running on the
Graphics Stay organized with collections Save and categorize content based on your preferences. The Android framework offers a variety of graphics rendering APIs for 2D and 3D that interact with manufacturer implementations of graphics drivers, so it is important to have a good understanding of how those APIs work at a higher level. This page introduces the graphics hardware abstraction layer (HAL
Graphics architecture Stay organized with collections Save and categorize content based on your preferences. What every developer should know about surfaces, SurfaceHolder, EGLSurface, SurfaceView, GLSurfaceView, SurfaceTexture, TextureView, SurfaceFlinger, and Vulkan. This page describes essential elements of the Android system-level graphics architecture and how they are used by the app framewor
Device configuration Stay organized with collections Save and categorize content based on your preferences. External storage is managed by a combination of the vold init service and StorageManagerService system service. Mounting of physical external storage volumes is handled by vold, which performs staging operations to prepare the media before exposing it to apps. Note: In Android 8.0, the Mount
Dalvik bytecode format Stay organized with collections Save and categorize content based on your preferences. General design The machine model and calling conventions are meant to approximately imitate common real architectures and C-style calling conventions: The machine is register-based, and frames are fixed in size upon creation. Each frame consists of a particular number of registers (specifi
Storage Stay organized with collections Save and categorize content based on your preferences. Android has evolved over time to support a wide variety of storage device types and features. All versions of Android support devices with traditional storage, which includes portable and emulated storage. Portable storage can be provided by physical media, like an SD card or USB, that is for temporary d
Android runtime and Dalvik Stay organized with collections Save and categorize content based on your preferences. Android runtime (ART) is the managed runtime used by apps and some system services on Android. ART and its predecessor Dalvik were originally created specifically for the Android project. ART as the runtime executes the Dalvik executable (DEX) format and DEX bytecode specification. ART
DRM Stay organized with collections Save and categorize content based on your preferences. This document provides an overview of the Android digital rights management (DRM) framework and introduces the interfaces that a DRM plugin must implement. This document doesn't describe robustness rules or compliance rules that may be defined by a DRM scheme. Framework The Android platform provides an exten
Touch devices Stay organized with collections Save and categorize content based on your preferences. Android supports a variety of touch screens and touch pads, including stylus-based digitizer tablets. Touch screens are touch devices that are associated with a display such that the user has the impression of directly manipulating items on screen. Touch pads are touch devices that aren't associate
Android peripherals and accessories Stay organized with collections Save and categorize content based on your preferences. Using a suite of standard protocols, you can implement compelling peripherals and other accessories that extend Android capabilities in a wide range of Android-powered devices. Audio accessories Android supports local on-device audio and remote off-device audio over a wired 3.
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