基于Copyright2010SonyCorporation.ppt

Android System ProgrammingTips and Tricks Tim Bird Sony Network Entertainment, Inc. tim.bird (at) Overview Intro to Android Working with Source Interacting with the Target Debug and Trace tools Performance tools Random thoughts on Android Resources Intro to Android Google runtime on top of Linux Android device proliferation Working With Source Working with Source Git Repo Build System Building fast Adding a program to the build Git Android open source project uses git You need to learn to use git well, really Need to know how to do a git rebase especially for kernel patches git rebase -i Kernel patch rebase needed for moving kernel versions, porting work, etc. Lots of online resources Recommended online book: /book/ Repo Export REPO_TRACE=1 is handy to see what git commands are happening Repo tricks Repo forall -c git diff remote_branch Repo forall -c echo $REPO_PATH;git remote -v Use to see upstream remotes from which to compare and merge with. Repo manifest -r -o my-tag-file.xml Make a repository snapshot manifest Build system Lots of interesting stuff in build/envsetup.sh help choosecombo/lunch jgrep/cgrep godir Interesting make targets: showcommands – psuedo-target to show build commands sdk – can build the SDK from scratch Fast building Parallel make threads make -j6 Use 2 more than your number of CPUs (include hyperthreaded CPUs) Compiled output cache ccache is in /prebuilt area export USE_CCACHE=1 Great for rebuilds (21 minutes on my desktop) Make only a specific module mm – build only the module(s) in the current directory (and below) I usually combine with a custom install script, which copies from out/target/product/board Adding a program to the build Make a directory under external e.g. android/external/myprogram Create your C/cpp files. Create Android.mk as clone of external/ping/Android.mk Change the names ping.c and ping to match your C/cpp files and program name Add the directory name in ANDROID/build/core/main.mk after external/zlib as externa