编译android源码并且flash进设备
Building the System
The basic sequence of build commands is as follows:
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
source 是用 .sh 文件对命令进行的初始化。
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