Android编译相关

Invoke ". build/envsetup.sh" from your shell to add thefollowing functions to your environment:

- croot:   Changes directory to the top of the tree.
- m:       Makesfrom the top of the tree.
- mm:      Builds all of the modules in the currentdirectory.
- mmm:     Builds all of the modules in the supplieddirectories.
- cgrep:   Greps on all local C/C++ files.
- hgrep:   Greps on all local C/C++ header files.
- jgrep:   Greps on all local Java files.
- mkgrep:  Greps on all local make files.
- rcgrep:  Greps on all local .rc files.
- resgrep: Greps on all local res/*.xml files.
- shgrep:  Greps on all local .sh files.
- godir:   Go to the directory containing a file.