1. <whitone@netstudent.polito.it>
Android:
Modding & Hacking
whitone
2012/12/12

2. A mobile-centric Linux distro
What is Android?
A mobile-centric Linux distro
patched Linux kernel
Bionic Libc
Dalvik Java VM
App Framework
Pag. 2
2012/12/12
whitone CorsoAvanzatoLinux 2012

3. Android Architecture Pag. 3 2012/12/12
whitone CorsoAvanzatoLinux 2012

4. Android Version Usage Pag. 4 2012/12/12
whitone CorsoAvanzatoLinux 2012

5. Android kernel patches
low memory killer Viking Killer
wake lock /sys/power/wake_lock
early suspend /sys/power/request_state
timed gpio userspace driver
Pag. 5
2012/12/12
whitone CorsoAvanzatoLinux 2012

6. Android kernel patches
ashmem cache
pmem contiguous malloc
binder IPC
ram console /proc/last_kmsg
android debug bridge
Pag. 6
2012/12/12
whitone CorsoAvanzatoLinux 2012

7. Android kernel patches
… more on:
linux-kernel-source / drivers / staging / android
Pag. 7
2012/12/12
whitone CorsoAvanzatoLinux 2012

8. Bionic Libc embedded optimized no fully POSIX
not compatible with GNU Libc
native programs
must linked to this library
Pag. 8
2012/12/12
whitone CorsoAvanzatoLinux 2012

9. Dalvik Java VM register-based architecture low memory requirements
Java bytecode (.class)
Dalvik Executable (.dex)
low memory requirements
Pag. 9
2012/12/12
whitone CorsoAvanzatoLinux 2012

10. Android Packages (APK)
Android Applications
Android Packages (APK)
installation via:
Google Play Store
storage (usb hd, sd, ...)
adb
Pag. 10
2012/12/12
whitone CorsoAvanzatoLinux 2012

11. root of a typical linux tree
File System
/system
root of a typical linux tree
/data
apps data
/cache
apps cache
/mnt
storage
Pag. 11
2012/12/12
whitone CorsoAvanzatoLinux 2012

12. application framework
File System
in /system:
bin, etc, lib, usr
framework
application framework
app
system apps
media
bootanimation.zip
Pag. 12
2012/12/12
whitone CorsoAvanzatoLinux 2012

13. File System … also in /system: build.prop fonts xbin vendor
roboto (android > 4.0)
xbin
optional utilities
vendor
vendor addons
Pag. 13
2012/12/12
whitone CorsoAvanzatoLinux 2012

14. com.android.providers.settings
File System
in /data:
app
user apps
data
user data
com.android.providers.settings
dalvik-cache
dex files
Pag. 14
2012/12/12
whitone CorsoAvanzatoLinux 2012

15. Android Debug Bridge adb Android SDK install android-tools
or android-tools-adb
Android SDK
available also for Mac and Win
Pag. 15
2012/12/12
whitone CorsoAvanzatoLinux 2012

16. limited standard cmds getprop, setprop
Android Debug Bridge
adb shell
limited standard cmds getprop, setprop
netcfg
input am
busybox
Pag. 16
2012/12/12
whitone CorsoAvanzatoLinux 2012

17. android_metadata language system volume secure lock SQLite 3
Settings Database
android_metadata
language system
volume
secure
lock
SQLite 3
Pag. 17
2012/12/12
whitone CorsoAvanzatoLinux 2012

18. Simple Boot Animation Pag. 18 2012/12/12
whitone CorsoAvanzatoLinux 2012

19. Simple Boot Animation Pag. 19 2012/12/12
whitone CorsoAvanzatoLinux 2012

20. Android NDK $ arm-linux-androideabi- <TAB>
Android Toolchain
Android NDK
$ arm-linux-androideabi- <TAB>
Pag. 20
2012/12/12
whitone CorsoAvanzatoLinux 2012

21. Useful Links Official Android Dev XDA Developers Android NDK
developer.android.com
XDA Developers
Android NDK
developer.android.com/sdk/ndk/index.html
Pag. 21
2012/12/12
whitone CorsoAvanzatoLinux 2012