There are instructions for other platforms linked from the get the code page.
Are you a Google employee? See go/building-android-chrome instead.
Most development is done on Ubuntu. Other distros may or may not work; see the Linux instructions for some suggestions.
Building the Android client on Windows or Mac is not supported and doesn't work.
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
depot_tools to the end of your PATH (you will probably want to put this in your
~/.zshrc). Assuming you cloned
chromium directory for the checkout and change to it (you can call this whatever you like and put it wherever you like, as long as the full path has no spaces):
mkdir ~/chromium && cd ~/chromium fetch --nohooks android
If you don't want the full repo history, you can save a lot of time by adding the
--no-history flag to
Expect the command to take 30 minutes on even a fast connection, and many hours on slower ones.
If you've already installed the build dependencies on the machine (from another checkout, for example), you can omit the
--nohooks flag and
fetch will automatically execute
gclient runhooks at the end.
fetch completes, it will have created a hidden
.gclient file and a directory called
src in the working directory. The remaining instructions assume you have switched to the
If you have an existing Linux checkout, you can add Android support by appending
target_os = ['android'] to your
.gclient file (in the directory above
echo "target_os = [ 'android' ]" >> ../.gclient
gclient sync to pull the new Android dependencies:
(This is the only difference between
fetch android and
Once you have checked out the code, run
to get all of the dependencies you need to build on Linux, plus all of the Android-specific dependencies (you need some of the regular Linux dependencies because an Android build includes a bunch of the Linux tools and utilities).
Once you've run
install-build-deps at least once, you can now run the Chromium-specific hooks, which will download additional binaries and other things you might need:
Optional: You can also install API keys if you want your build to talk to some Google services, but this is not necessary for most development and testing purposes.
Chromium uses Ninja as its main build tool along with a tool called GN to generate
.ninja files. You can create any number of build directories with different configurations. To create a build directory which builds Chrome for Android, run
gn args out/Default and edit the file to contain the following arguments:
target_os = "android" target_cpu = "arm64" # See "Figuring out target_cpu" below
Defaultwith another name, but it should be a subdirectory of
gn helpon the command line or read the quick start guide.
Also be aware that some scripts (e.g.
adb_gdb.py) require you to set
The value of
target_cpu determines what instruction set to use for native code. Given a device (or emulator), you can determine the correct instruction set with
adb shell getprop ro.product.cpu.abi:
x86may optionally be used instead of
x64for non-WebView targets. This is also allowed for Monochrome, but only when not set as the WebView provider.
Build Chromium with Ninja using the command:
autoninja -C out/Default chrome_public_apk
autoninja is a wrapper that automatically provides optimal values for the arguments passed to
You can get a list of all of the other build targets from GN by running
gn ls out/Default from the command line. To compile one, pass the GN label to Ninja with no preceding “//” (so, for
autoninja -C out/Default chrome/test:unit_tests).
The Google Play Store allows apps to send customized
.aab files depending on the version of Android running on a device. Chrome uses this feature to package optimized versions for different OS versions.
chrome_public_apk, but any of the other targets can be substituted.
To update an existing checkout, you can run
$ git rebase-update $ gclient sync
The first command updates the primary Chromium source repository and rebases any of your local branches on top of tip-of-tree (aka the Git branch
origin/master). If you don't want to use this script, you can also just use
git pull or other common Git commands to update the repo.
The second command syncs dependencies to the appropriate versions and re-runs hooks as needed.
Make sure your Android device is plugged in via USB, and USB Debugging is enabled.
To enable USB Debugging:
You may also be prompted to allow access to your PC once your device is plugged in.
You can check if the device is connected by running:
Which prints a list of connected devices. If not connected, try unplugging and reattaching your device.
Allow Android to run APKs that haven't been signed through the Play Store:
In case that setting isn't present, it may be possible to configure it via
adb shell instead:
third_party/android_sdk/public/platform-tools/adb shell settings put global verifier_verify_adb_installs 0
autoninja -C out/Default chrome_public_apk
And deploy it to your Android device:
The app will appear on the device as “Chromium”.
Wraps the content module (but not the /chrome embedder). See https://www.chromium.org/developers/content-module for details on the content module and content shell.
autoninja -C out/Default content_shell_apk out/Default/bin/content_shell_apk install
this will build and install an Android apk under
Android WebView is a system framework component. Since Android KitKat, it is implemented using Chromium code (based off the content module).
If you want to build the complete Android WebView framework component and test the effect of your chromium changes in Android apps using WebView, you should follow the Android AOSP + chromium WebView instructions
For Content shell:
out/Default/bin/content_shell_apk launch [--args='--foo --bar'] http://example.com
For Chrome public:
out/Default/bin/chrome_public_apk launch [--args='--foo --bar'] http://example.com
Logging is often the easiest way to understand code flow. In C++ you can print log statements using the LOG macro. In Java, refer to android_logging.md.
You can see these log via
adb logcat, or:
Logcat supports an additional feature of filtering and highlighting user-defined patterns. To use this mechanism, define a shell variable:
CHROMIUM_LOGCAT_HIGHLIGHT and assign your desired pattern. The pattern will be used to search for any substring (ie. no need to prefix or suffix it with
export CHROMIUM_LOGCAT_HIGHLIGHT='(WARNING|cr_Child)' out/Default.bin/chrome_public_apk logcat # Highlights messages/tags containing WARNING and cr_Child strings.
Note: both Message and Tag portion of logcat are matched against the pattern.
To debug C++ code, use one of the following commands:
out/Default/bin/content_shell_apk gdb out/Default/bin/chrome_public_apk gdb
See Android Debugging Instructions for more on debugging, including how to debug Java code.
For information on running tests, see Android Test Instructions.
Args that affect build speed:
is_component_build = true(default=
.sofiles instead of just one (faster links)
is_java_debug = true(default=
treat_warnings_as_errors = false(default=
use_errorprone_java_compiler = false(default=
disable_android_lint = true(default=
Normally analysis build steps like lint and errorprone will run in parallel with the rest of the build. The build will then wait for all analysis steps to complete successfully. By offloading analysis build steps to a separate build server to be run lazily at a low priority when the machine is idle, the actual build can complete up to 50-80% faster.
To take advantage of this speedup, run the script at //build/android/fast_local_dev_server.py in a separate terminal window. All your local builds will now forward analysis steps to this server. Analysis steps include android lint, errorprone, bytecode processor, etc. The output of these analysis checks will then be displayed in the terminal window running the server.
Note: Since the build completes before the analysis checks finish, the build will not fail if an analysis check fails. Make sure to check the terminal that the server is running in at regular intervals to fix outstanding issues caught by these analysis checks.
Incremental Install uses reflection and sideloading to speed up the edit & deploy cycle (normally < 10 seconds). The initial launch of the apk will be a lot slower on older Android versions (pre-N) where the OS needs to pre-optimize the side-loaded files, but then be only marginally slower after the first launch.
To enable Incremental Install, add the gn args:
incremental_install = true
Some APKs (e.g. WebView) do not work with incremental install, and are blacklisted from being built as such (via
never_incremental = true), so are build as normal APKs even when
incremental_install = true.
Running on an emulator is the same as on a device. Refer to android_emulator.md for setting up emulators.
These instructions are only necessary for Chrome 51 and earlier.
In the case where you want to modify the native code for an existing release of Chrome for Android (v25+) you can do the following steps. Note that in order to get your changes into the official release, you'll need to send your change for a codereview using the regular process for committing code to chromium.