Buildung for the emulator

General

The lunch combo is full_x86-eng

basic make command

cd <android>/system
export PATH=$(java-config -O)/bin:$PATH
. build/envsetup.sh
lunch full_x86-eng
nice -n 19 make -j6

Running in emulator

emulator64-x86 -partition-size 300

Complete rebuild of system

To completely rebuild the system but keep the common stuff do:

make installclean && make -j6

Rebuilding framework

To rebuild only a certain module and update the system image run

mmm framework/base
make snod

or

make framework snod

but the resulting system image will not boot but boot-loop with messages like:

I/dalvikvm( 1011): DexOpt: mismatch dep signature for '/system/framework/framework.odex'
E/dalvikvm( 1011): /system/framework/telephony-common.jar odex has stale dependencies

To avoid this one has to turn of the DEXPREOPT variable (see below).

Turn of DEXPREOPT

There are 2 ways. Either edit build/target/board/generic_x86/BoardConfig.mk and change

WITH_DEXPREOPT := true

to

WITH_DEXPREOPT := false

or run the make commands with the WITH_DEXPREOPT=false addition. like

make framework showcommands WITH_DEXPREOPT=false

Changing framework without rebuilding system

To change the framework of a running system you can do:

adb shell stop
adb remount
adb push out/target/product/generic_x86/system/framework/framework.jar /system/framework/
adb sync
adb shell start