android编译
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Building the System
The basic sequence of build commands is as follows:
Initialize
Initialize the environment with the envsetup.sh
script. Notethat replacing "source" with a single dot saves a few characters,and the short form is more commonly used in documentation.
$ source build/envsetup.sh
or
$ . build/envsetup.sh
Choose a Target
Choose which target to build with lunch
. The exact configuration can be passed asan argument, e.g.
$ lunch full-eng
The example above refers to a complete build for the emulator, with all debugging enabled.
If run with no arguments lunch
will prompt you to choose a target from the menu.
All build targets take the form BUILD-BUILDTYPE, where the BUILD is a codenamereferring to the particular feature combination. Here's a partial list:
full
build running on Galaxy Nexus GSM/HSPA+ ("maguro")full_pandapandafull
build running on PandaBoard ("panda")and the BUILDTYPE is one of the following:
For more information about building for and running on actual hardware, seeBuilding for devices
Build the Code
Build everything with make
. GNU make can handle paralleltasks with a-jN
argument, and it's common to use a number oftasks N that's between 1 and 2 times the number of hardwarethreads on the computer being used for the build. E.g. on adual-E5520 machine (2 CPUs, 4 cores per CPU, 2 threads per core),the fastest builds are made with commands between make -j16
andmake -j32
.
$ make -j4
Run It!
You can either run your build on an emulator or flash it on a device. Please note that you have already selected your build target withlunch
, and it is unlikely at best to run on a different target than it was built for.
Flash a Device
To flash a device, you will need to use fastboot
, which should be included in your path after a successful build. Place the device in fastboot mode either manually by holding the appropriate key combination at boot, or from the shell with
$ adb reboot bootloader
Once the device is in fastboot mode, run
$ fastboot flashall -w
The -w
option wipes the /data
partition on the device; this is useful for your first time flashing a particular device, but is otherwise unnecessary.
For more information about building for and running on actual hardware, seeBuilding for devices
Emulate an Android Device
The emulator is added to your path automatically by the build process. To run the emulator, type
$ emulator
Using ccache
ccache is a compiler cache for C and C++ that can help make builds faster.In the root of the source tree, do the following:
$ export USE_CCACHE=1$ export CCACHE_DIR=/<path_of_your_choice>/.ccache$ prebuilt/linux-x86/ccache/ccache -M 20G
You can watch ccache being used by doing the following:
$ watch -n1 -d prebuilt/linux-x86/ccache/ccache -s
On OSX, you should replace linux-x86
with darwin-x86
.
Troubleshooting Common Build Errors
Wrong Java Version
If you are attempting to build froyo or earlier with Java 1.6, or gingerbread or laterwith Java 1.5,make
will abort with a message such as
************************************************************You are attempting to build with the incorrect versionof java.Your version is: WRONG_VERSION.The correct version is: RIGHT_VERSION.Please follow the machine setup instructions at https://source.android.com/source/download.html************************************************************
This may be caused by
failing to install the correct JDK as specified on the Initializing page. Building Android requires Sun JDK 5 or 6 depending on which release you are building.
another JDK that you previously installed appearing in your path. You can remove the offending JDK from your path with:
$ export PATH=${PATH/\/path\/to\/jdk\/dir:/}
Python Version 3
Repo is built on particular functionality from Python 2.x and is unfortunately incompatible with Python 3. In order to use repo, please install Python 2.x:
$ apt-get install python
Case Insensitive Filesystem
If you are building on an HFS filesystem on Mac OS X, you may encounter an error such as
************************************************************You are building on a case-insensitive filesystem.Please move your source tree to a case-sensitive filesystem.************************************************************
Please follow the instructions on the Initializing page for creating a case-sensitive disk image.
No USB Permission
On most Linux systems, unprivileged users cannot access USB ports by default. If you see a permission denied error, follow the instructions on theInitializing page for configuring USB access.
If adb was already running and cannot connect to the device aftergetting those rules set up, it can be killed withadb kill-server
.That will cause adb to restart with the new configuration.
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