OS: Android - Build
Initialize
Initialize the environment with the envsetup.sh script. Note that 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 as an 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 codename referring to the particular feature combination. Here's a partial list:
Build name Device Notes
full emulator fully configured with all languages, apps, input methods
full_maguro maguro full build running on Galaxy Nexus GSM/HSPA+ ("maguro")
full_panda panda full build running on PandaBoard ("panda")
and the BUILDTYPE is one of the following:
Buildtype Use user limited access; suited for production userdebug like "user" but with root access and debuggability; preferred for debugging eng development configuration with additional debugging tools
For more information about building for and running on actual hardware, see Building for Devices.
Build the Code
Build everything with make. GNU make can handle parallel tasks with a -jN argument, and it's common to use a number of tasks N that's between 1 and 2 times the number of hardware threads on the computer being used for the build. E.g. on a dual-E5520 machine (2 CPUs, 4 cores per CPU, 2 threads per core), the fastest builds are made with commands between make -j16 and make -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 with lunch, 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, see Building for Devices.