Make targets

Here is a list of different make targets you can use to build different parts of the system:

• make sdk - build the tools that are part of an SDK (adb, fastboot, etc.)
• make snod - build the system image from the current software binaries
• make services
• make runtime
• make droid - make droid is the normal build.
• make all - make everything, whether it is included in the product definition or not
• make clean - remove all built files (prepare for a new build). Same as rm -rf out//
• make modules - shows a list of submodules that can be built (List of all LOCAL_MODULE definitions)
• make - make a specific module (note that this is not the same as directory name. It is the LOCAL_MODULE definition in the Android.mk file)
• make clean- - clean a specific module
• make bootimage TARGET_PREBUILT_KERNEL=/path/to/bzImage - create a new boot image with custom bzImage

ref : Android Build System