What is aosp helper

This struct contains all device health information available through health 2. The main interface, IHealth , provides the following additional functions.

In addition, the implementation of 2. This struct contains additional device health information available through health 2. For information on implementing the Health service, see Implementing Health. Content and code samples on this page are subject to the licenses described in the Content License.

Docs Getting Started About. Core Topics Architecture. Overview Architecture. Modular System Components. Modular Kernels. HIDL General.

HIDL Java. ConfigStore HAL. Device Tree Overlays. Vendor NDK. Vendor Interface Object. Core Concepts. Camera Features. Bluetooth and NFC. Calling and Messaging. ACTS Tests. Failed to load latest commit information. View code. About No description, website, or topics provided. Releases No releases published. Packages 0 No packages published. To build the whole thing, run 'make' in the top directory. The build will take a long time, if you are building everything for example, the first time you do it.

This can be used in conjunction with another make target, to see the commands for that build. That is, 'showcommands' is not a target itself, but just a modifier for the specified build.

In the example above, the -j4 is unrelated to the showcommands option, and is used to execute 4 make sessions that run in parallel. There are some helper macros and functions that are installed when you source envsetup. They are documented at the top of envesetup. In my experience, you should specify about 2 more threads than you have processors on your machine.

If you have 2 processors, use 'make -j4', If they are hyperthreaded meaning you have 4 virtual processors , try 'make -j6. You can also specify to use the 'ccache' compiler cache, which will speed up things once you have built things a first time. Note that ccache is included in the prebuilt section of the repository, and does not have to be installed on your host separately. Use the 'mm' or 'mmm' commands to do this. The 'mm' command makes stuff in the current directory and sub-directories, I believe.

With the 'mmm' command, you specify a directory or list of directories, and it builds those. To install your changes, do 'make snod' from the top of tree. It takes only one minute and 30 seconds.

In my case it is only twice as fast compared to the full build and flash cycle. But in general the speedup is much bigger if your device has a slower storage and slower boot time than the Pixel 2. The Pixel 2 is astonishingly fast. All embedded boards I have worked with have longer boot times. Keep these restrictions in mind when working on the kernel, HAL services or selinux policies. For example, the HAL services are not terminated when executing stop.

You have to restart them manually. Additional tip: The command adb sync accepts argument partition names as arguments. For such non-clean build issues you would normally remove all intermediate and generated files and rebuild everything.

The target for removing the build directory is the well known clobber:. It will only remove the file system images, the file system contents and some other stuff. But it will not remove the intermediate build files. See the code for details.

The next build run only needs to copy the already compiled files, which is much much faster. There is good overall documentation about the architecture, the concepts and tools of the AOSP provided by Google. A nice starting point is the webpage Android Architecture.

Additionally, there is also a lot more information about the AOSP in the below mentioned books. But at some point there is no other way to get more information: you have to poke into the source code.

So watch out for plain text documentation in the tree. To quickly browse and search the AOSP source code, you can use specialized online search engines:. They have indexed all AOSP versions and allow users to quickly search and navigate between definitions and usages of functions in different versions and release candidates.

In fact, a huge fraction of my working time as a developer I spend searching and reading the source code — either locally or with the code search engine tools. When debugging Android apps and system components, you often look and grep in the Android logcat buffer.

As you mostly already know, you can view the log messages with the adb command:. It removes all current messages from the logbuffer. This makes identifying new messages easier — e. The adb command misses one great feature. The Android Studio UI has the ability to filter messages for a specific application. Both projects are a wrapper around adb logcat and allow showing messages for only a single application. For example. The first project probably has a more famous author but I like the later project more.

It is written by a co-worker and coded in Go. It does not change the format of log messages like pidcat does. It only adds coloring and application grepping support. When reading the AOSP source code on my local machine, I often grep for function names or special strings in the source code. Since the AOSP source code is quite large, the standard grep command takes some seconds crunching through the files and directories.

The ripgrep project is written in Rust and provides the command line tool rg. It searches recursively by default and is a lot faster than the standard GNU grep. An example. On my multi-core notebook the wall clock execution time of ripgrep is 15 times faster than GNU grep. It is written in C and is also faster than GNU grep.