Marko Gargenta_Remixing android

Remixing Android
Marko Gargenta @Marakana

About Marko Gargenta

1.1. Entrepreneur, Author, Speaker
Developer of Android Bootcamp for Marakana.
Instructor for 1,000s of developers on Android at Qualcomm, Cisco, Motorola, Intel,
DoD and other great orgs.
Author of Learning Android published by O’Reilly.
Speaker at OSCON (3x), ACM, IEEE, SDC, AnDevCon. Co-Founder of SFAndroid.org
Co-Chair of Android Open conference: Android Open

Why Remix Android??
2.1. Vanilla is just not for everyone.
r·i/ēmk/
emxrˈis:

Vr:
eb
Mx(oehn)aan
i smtig gi.
Nu:
on
Adfeetvrino a oe oeaigsse poue i sc awy
ifrn eso f n pn prtn ytm rdcd n uh a.

Because Android is open
Because custom is better
Because we can

Remix What?!?
3.1. Cosmetics aside, we’re focusing on major surgery to Android OS.
Registering New Device: Marakana Alpha
Makefile Plumbing
Building Alpha Device
Adding Custom Kernel
Adding Native Libs
Adding Native Daemon
Exposing Libs via JNI
Registering New System Service
Extending Android Framework
Adding New App
Creating SDK Add-on

Android Stack: The High Level Overview

Android Stack: From Source to Device

Android Stack: Layer Interaction

Getting the AOSP Source
Initialize the build environment

Download the source

Build the source

Run on device

Setting up the Directory Structure

Self-contained directory structure:
d v c / a a a a : Main
eiemrkn/ placeholder for Marakana Alpha codebase.
d v c / a a a a a p a Code
eiemrkn/lh: that goes onto the device.
d v c / a a a a a p a s k a d n Code
eiemrkn/lh-d_do: that goes into the SDK add-on.
d v c / a a a a a p a c m o : Shared
eiemrkn/lh-omn codebase for device and SDK add-on.

Registering Marakana Alpha
11.1. To future-proof your changes, don’t sprinkle other people’s code - keep it
separate.
Create v n o s t p s file:
edreu.h
device/marakana/alpha/vendorsetup.sh

adlnhcmofl_aaaaapaeg
d_uc_ob ulmrkn_lh-n

Rebuild the lunch menu:
$suc bideveu.h
ore ul/nstps
icuigdvc/aaaaapavnostps
nldn eiemrkn/lh/edreu.h
icuigdvc/oosiga/edreu.h
nldn eiemt/tnryvnostps
icuigdvc/oownryvnostps
nldn eiemt/iga/edreu.h
icuigdvc/asn/rsogvnostps
nldn eiesmugcep4/edreu.h
icuigdvc/asn/rsovnostps
nldn eiesmugcep/edreu.h
icuigdvc/asn/auovnostps
nldn eiesmugmgr/edreu.h
icuigdvc/asn/oovnostps
nldn eiesmugtr/edreu.h
icuigdvc/asn/uavnostps
nldn eiesmugtn/edreu.h
icuigdvc/ipnavnostps
nldn eiet/ad/edreu.h
icuigskbs_opeinabbs
nldn d/ahcmlto/d.ah

Makefile Plumbing
12.1. The make system is complex - copy from samples to get started.
Create main product make file:
dvc/aaaaapaAdodrdcsm
eiemrkn/lh/nriPout.k

POUTMKFLS: $LCLDR/ulapam
RDC_AEIE = (OA_I)fl_lh.k

Create the main build file:
dvc/aaaaapafl_lh.k
eiemrkn/lh/ulapam

$cl ihrtpout $SCTRE_I)poutlnugssalm)
(al nei-rdc, (R_AGTDR/rdc/agae_ml.k
$cl ihrtpout $SCTRE_I)poutgnrcm)
(al nei-rdc, (R_AGTDR/rdc/eei.k

#Dsadihrtdvle adueoronised
icr neie aus n s u w nta.
POUTNM : fl_aaaaapa
RDC_AE = ulmrkn_lh
POUTDVC : apa
RDC_EIE = lh
POUTMDL: Fl Mrkn ApaIaefrEuao
RDC_OE = ul aaaa lh mg o mltr

icue$cl almkflsudr$LCLPT)
nld (al l-aeie-ne,(OA_AH)

Copy boiler-plate files from generic:

$c bidtre/or/eei/orCni.k
p ul/agtbadgnrcBadofgm
dvc/aaaaapa.
eiemrkn/lh/
$c bidtre/or/eei/nriBadm
p ul/agtbadgnrcAdodor.k
dvc/aaaaapa.
eiemrkn/lh/
$c bidtre/or/eei/eiem
p ul/agtbadgnrcdvc.k
dvc/aaaaapa.
eiemrkn/lh/
$c bidtre/or/eei/ytmpo
p ul/agtbadgnrcsse.rp
dvc/aaaaapa.
eiemrkn/lh/

Generating Platform Signing Keys
13.1. To pass CTS, we must generate our own platform signing keys
Define our subject/issuer info:

$SGE=/=SS=aionaLSnFacsoOMrkn
INR"CU/TClfri/=a rnic/=aaaa
Ic/UAdodC=nri Pafr Sge/miAdesadodmrkn.o"
n.O=nri/NAdod ltom inrealdrs=nri@aaaacm

Remove the existing keys (it does not hurt to back them up first!):

$r bidtre/rdc/euiy*p
m ul/agtpoutscrt/.*

Generate the platform key:

$eh |dvlpettosmk_e bidtre/rdc/euiypafr
co eeomn/ol/aeky ul/agtpoutscrt/ltom
"SGE"
$INR
cetn bidtre/rdc/euiypafr.k wt n pswr
raig ul/agtpoutscrt/ltomp8 ih o asod
Gnrtn RApiaeky 24 btln mdls
eeaig S rvt e, 08 i og ouu
..........++
..........+
.............................++
.............................+
ei 3(x)
s 03

Generate the shared key:

$eh |dvlpettosmk_e bidtre/rdc/euiysae
co eeomn/ol/aeky ul/agtpoutscrt/hrd
"SGE"
$INR
cetn bidtre/rdc/euiysae.k wt n pswr
raig ul/agtpoutscrt/hrdp8 ih o asod
........................................
........................................
.........++
.........+
......++
......+
ei 3(x)
s 03

Generate the media key:
$eh |dvlpettosmk_e bidtre/rdc/euiymda
co eeomn/ol/aeky ul/agtpoutscrt/ei
"SGE"
$INR
cetn bidtre/rdc/euiymdap8wt n pswr
raig ul/agtpoutscrt/ei.k ih o asod

..........+
.........++
..........++
..........+
ei 3(x)
s 03

Generate the testkey key:
$eh |dvlpettosmk_e bidtre/rdc/euiytsky
co eeomn/ol/aeky ul/agtpoutscrt/ete
"SGE"
$INR
cetn bidtre/rdc/euiytskyp8wt n pswr
raig ul/agtpoutscrt/ete.k ih o asod
..........++
..........+
........................++
........................+
ei 3(x)
s 03

Verify that our keys have been created:
$l - bidtre/rdc/euiy*p
s 1 ul/agtpoutscrt/.*
bidtre/rdc/euiymdap8
ul/agtpoutscrt/ei.k
bidtre/rdc/euiymdax0.e
ul/agtpoutscrt/ei.59pm
bidtre/rdc/euiypafr.k
ul/agtpoutscrt/ltomp8
bidtre/rdc/euiypafr.59pm
ul/agtpoutscrt/ltomx0.e
bidtre/rdc/euiysae.k
ul/agtpoutscrt/hrdp8
bidtre/rdc/euiysae.59pm
ul/agtpoutscrt/hrdx0.e
bidtre/rdc/euiytskyp8
ul/agtpoutscrt/ete.k
bidtre/rdc/euiytskyx0.e
ul/agtpoutscrt/ete.59pm

Check that our specific subject/issuer has been used:

$oeslx0 -ou -ujc -sur-n
pns 59 not sbet ise i
bidtre/rdc/euiypafr.59pm
ul/agtpoutscrt/ltomx0.e
sbet /=SS=aionaLSnFacsoOMrkn
ujc= CU/TClfri/=a rnic/=aaaa
Ic/UAdodC=nri Pafr Sge/miAdesadodmrkn.o
ise=/=SS=aionaLSnFacsoOMrkn
sur CU/TClfri/=a rnic/=aaaa
Ic/UAdodC=nri Pafr Sge/miAdesadodmrkn.o

The b i d t r e / r d c / e u i y . k files are the private keys (. 5 9 p mare the
ul/agtpoutscrt/p8 x0.e
certificates) - keep them safe and secure - especially since we did not encrypt them!

Building Alpha Device
14.1. Let’s build Alpha - so far a vanilla Android.
Register the device with build system

$suc bideveu.h
ore ul/nstps
icuigdvc/aaaaapavnostps
nldn eiemrkn/lh/edreu.h
…

Choose lunch menu
$lnhfl_aaaaapaeg
uc ulmrkn_lh-n

======================
======================
PAFR_ESO_OEAERL
LTOMVRINCDNM=E
PAFR_ESO=..
LTOMVRIN403
TRE_RDC=ulmrkn_lh
AGTPOUTfl_aaaaapa
TRE_UL_AIN=n
AGTBIDVRATeg
TRE_UL_YErlae
AGTBIDTP=ees
TRE_UL_PS
AGTBIDAP=
TRE_RHam
AGTAC=r
TRE_RHVRATam7a
AGTAC_AIN=rv-
HS_RHx6
OTAC=8
HS_Slnx
OTO=iu
HS_UL_YErlae
OTBIDTP=ees
BIDI=M7K
UL_DIL4
======================
======================

Compile the device
$epr UECAH=
xot S_CCE1
$mk -1
ae j0
…
Isaldfl ls:ottre/rdc/lh/ntle-ie.x
ntle ie it u/agtpoutapaisaldflstt
Tre sse f iae
agt ytm s mg:
ottre/rdc/lh/b/AKGN/ytmmg_nemdae/ytmig
u/agtpoutapaojPCAIGsseiaeitreitssse.m
Isalsse f iae ottre/rdc/lh/ytmig
ntl ytm s mg: u/agtpoutapasse.m

Run new device

$euao -v Apa
mltr ad lh
-ytmottre/rdc/lh/ytmig
sse u/agtpoutapasse.m
-ads ottre/rdc/lh/ads.m
rmik u/agtpoutaparmikig

Verify build number
Look for the Build number property in System Settings→About phone screen.

Marakana Alpha Custom Kernel Steps
17.1. Not everyone is going to need a custom kernel - but we can have it.
Download and build kernel source

$mdr~kre/
ki /enl
$c ~kre/
d /enl
$gtcoehts/adodgolsuc.o/enlglfs.i
i ln tp:/nri.ogeorecmkre/odihgt
$c glfs/
d odih
$gtbac -
i rnh a
$gtceku - rmtsoii/nri-odih262
i hcot t eoe/rgnadodglfs-..9
$mk glfs_rv_ecni AC=r
ae odiham7dfofg RHam
$mk mncni
ae euofg
$mk -1 AC=r
ae j0 RHam
COSCMIE/OPpeul/iu-8/olhi/r-ai443bnameb-
RS_OPL=AS/rbitlnxx6tocanameb-../i/r-ai

Copy kernel into our device folder

c /aht/enlac/r/otzmg dvc/aaaaapacmo/enl
p pt/okre/rhambo/Iae eiemrkn/lh-omnkre

Enable our custom kernel in BoardConfig.mk
device/marakana/alpha/BoardConfig.mk

…
TRE_OKRE : fle
AGTN_ENL = as
…

Create a alpha.mk makefile for our common components
device/marakana/alpha-common/alpha.mk
M_AH: $LCLPT)./lh-omn
YPT = (OA_AH/.apacmo

icue$cl alsbi-aeie)
nld (al l-udrmkfls

#Eal orcso kre
nbe u utm enl
LCLKRE : $M_AH/enl
OA_ENL = (YPT)kre
POUTCP_IE + $LCLKRE)kre
RDC_OYFLS = (OA_ENL:enl

Include a p a m in main makefile f l _ l h . k
lh.k ulapam
device/marakana/alpha/full_alpha.mk

…
icuedvc/aaaaapacmo/lh.k
nld eiemrkn/lh-omnapam

Rebuild the device and restart the device with:

$euao -v Apa
mltr ad lh
-enlottre/rdc/lh/enl
kre u/agtpoutapakre
-ytmottre/rdc/lh/ytmig
sse u/agtpoutapasse.m
-ads ottre/rdc/lh/ads.m
rmik u/agtpoutaparmikig

Verify it worked

$abselct/rcvrin
d hl a po/eso
Lnxvrin262-aaaaeapeg09f (tdn@bnu (c vrin
iu eso ..9mrkn-xml-bd3b suetuut) gc eso
440(C))# TeJl1 2:40 PT21
.. GC 5 u u 9 22:3 D 01

Android Stack - Native Libraries

Marakana Alpha Custom Lib Steps
20.1. From drivers to open source libraries, you likely need custom libraries.
Create home for shared libraries

$mdrdvc/aaaaapacmo/i/
ki eiemrkn/lh-omnlb

Create shared libs makefile
device/marakana/alpha-common/lib/Android.mk

icue$cl alsbi-aeie)
nld (al l-udrmkfls

Create folder for l b r n o library
imklg

mdrdvc/aaaaapacmo/i/imklg
ki eiemrkn/lh-omnlblbrno

Create l b r n o . header file
imklgh
device/marakana/alpha-common/lib/libmrknlog/libmrknlog.h
..
.
etr itmk_ls_o(;
xen n rnfuhlg)
etr itmk_e_oa_o_ie)
xen n rngtttllgsz(;
etr itmk_e_sdlgsz(;
xen n rngtue_o_ie)
..
.

Implement the library l b r n o . using i c l )to talk to kernel
imklgc ot(
device/marakana/alpha-common/lib/libmrknlog/libmrknlog.c

Create the A d o d m makefile
nri.k
device/marakana/alpha-common/lib/libmrknlog/Android.mk
LCLPT: $cl m-i)
OA_AH= (al ydr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLSCFLS: lbrno.
OA_R_IE = imklgc
LCLSAE_IRRE : lbuislbtl lb
OA_HRDLBAIS = ictl iuis ic
LCLMDL : lbrno
OA_OUE = imklg
LCLPEIKMDL : fle
OA_RLN_OUE = as

icue$BIDSAE_IRR)
nld (UL_HRDLBAY

Register the library with a p a m
lh.k

…
POUTPCAE + lbrno
RDC_AKGS = imklg

Test l b r n o . obuilds
imklgs

$mk -1 lbrno
ae j0 imklg
…
tre SaeLb lbrno
agt hrdi: imklg
(u/agtpoutgnrcojSAE_IRRE/imklgitreitsLNE
ottre/rdc/eei/b/HRDLBAISlbrno_nemdae/IKD
/imklgs)
lbrno.o
tre Nnpeikd lbrno
agt o-rlne: imklg
(u/agtpoutgnrcsmossse/i/imklgs)
ottre/rdc/eei/ybl/ytmlblbrno.o
tre Srp lbrno (u/agtpoutgnrcojlblbrno.o
agt ti: imklg ottre/rdc/eei/b/i/imklgs)
Isal ottre/rdc/eei/ytmlblbrno.o
ntl: u/agtpoutgnrcsse/i/imklgs

Android Stack - Native Daemons

Marakana Alpha Native Daemon Steps
23.1. It’s nice to have a native daemon look over your shoulder.
Create folder for binaries

$mdrdvc/aaaaapacmo/i
ki eiemrkn/lh-omnbn
$mdrdvc/aaaaapacmo/i/rnod
ki eiemrkn/lh-omnbnmklg

Create A d o d m for binaries
nri.k
device/marakana/alpha-common/bin/Android.mk
icue$cl alsbi-aeie)
nld (al l-udrmkfls

Create daemon source file m k l g .
rnodc
device/marakana/alpha-common/bin/mrknlogd/mrknlogd.c

Create A d o d m file
nri.k
device/marakana/alpha-common/bin/mrknlogd/Android.mk

LCLPT: $cl m-i)
OA_AH= (al ydr

icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLSCFLS: mklg.
OA_R_IE = rnodc
LCLCICUE : $LCLPT)./.lblbrno/
OA__NLDS = (OA_AH/../i/imklg
LCLSAE_IRRE : lbrno lb lbuislbtl
OA_HRDLBAIS = imklg ic ictl iuis
LCLMDL : mklg
OA_OUE = rnod
icue$BIDEEUAL)
nld (UL_XCTBE

Register m k l g with a p a m file
rnod lh.k
…
POUTPCAE + mklg
RDC_AKGS = rnod

Create custom i i . cby using the default one
ntr

$c sse/oerodrii.cdvc/aaaaapacmo/
p ytmcr/oti/ntr eiemrkn/lh-omn.

Register m k l g with i i . c
rnod ntr
device/marakana/alpha-common/init.rc

…
#Mrkn' cso lgfuhn deo
aaaas utm o-lsig amn
sriemklg /ytmbnmklg 6
evc rnod sse/i/rnod 0
ue sse
sr ytm
goplg
ru o
oeht
nso

Include i i . cin our a p a m device build
ntr lh.k

…
#Cp orii.cfl oe teeitn oe(ic or cnan eta
oy u ntr ie vr h xsig n sne us otis xr
cags
hne)
POUTCP_IE + $M_AH/ntr:otii.c
RDC_OYFLS = (YPT)ii.cro/ntr

Build the device
$mk -1
ae j0
…

Verify it all works by restarting the device
#(esatteeuao
r)tr h mltr
$euao -enlottre/rdc/lh/enl&
mltr kre u/agtpoutapakre
#wi frteeuao t fns
at o h mltr o iih
#cekotordeo
hc u u amn
$absell - /ytmbnmklg
d hl s l sse/i/rnod
-wrx- ro
rx-rx ot sel
hl 50 21-71 0:5mklg
58 010-3 22 rnod
#cekta i rn
hc ht t us
$abselp |ge mklg
d hl s rp rnod
sse
ytm 37 1 14
04 22
9 c02f adba S/ytmbnmklg
0508 f0dc sse/i/rnod
$ablga |ge MK
d oct rp RN
IMK LgDeo(
/RN o amn 3) Fuhdlg(,6 o 656bts.Wiig6 scns
7: lse o 1 0 f 53 ye) atn 0 eod
bfr tenx fuh
eoe h et ls.
IMK LgDeo(
/RN o amn 3) Fuhdlg(,346o 656bts.Wiig6
7: lse o 2 40 f 53 ye) atn 0
scnsbfr tenx fuh
eod eoe h et ls.
IMK LgDeo(
/RN o amn 3) Fuhdlg(,22o 656bts.Wiig6
7: lse o 3 3 f 53 ye) atn 0

scnsbfr tenx fuh
eod eoe h et ls.
^C
$ablga -
d oct g
/e/o/an rn bfe i 6K (K cnue) mxetyi 49b mx
dvlgmi: ig ufr s 4b 0b osmd, a nr s 06, a
pyodi 47b
ala s 06
#go :)
od -

Wrapping Native Lib with JNI Steps
25.1. The glue for Java to talk to C and back.
Create directory structure for our JNI wrapper

$mdrdvc/aaaaapacmo/rmwr
ki eiemrkn/lh-omnfaeok
$mdrdvc/aaaaapacmo/rmwr/rno_n
ki eiemrkn/lh-omnfaeokmklgji
$mdrdvc/aaaaapacmo/rmwr/rno_n/aa
ki eiemrkn/lh-omnfaeokmklgjijv
$mdrdvc/aaaaapacmo/rmwr/rno_n/n
ki eiemrkn/lh-omnfaeokmklgjiji

Create top level A d o d m files
nri.k
device/marakana/alpha-common/framework/Android.mk

icue$cl alsbi-aeie)
nld (al l-udrmkfls

device/marakana/alpha-common/framework/mrknlog_jni/Android.mk
icue$cl alsbi-aeie)
nld (al l-udrmkfls

Create Java Library L b o . a a
iLgjv
dvc/aaaaapacmo/
eiemrkn/lh-omn
faeokmklgjijv/o/aaaaadodlblgLbo.aa
rmwr/rno_n/aacmmrkn/nri/i/o/iLgjv

Create test M i . a a
anjv
dvc/aaaaapacmo/
eiemrkn/lh-omn
faeokmklgjijv/o/aaaaadodlblgMi.aa
rmwr/rno_n/aacmmrkn/nri/i/o/anjv

Create custom permission
device/marakana/alpha-
common/framework/mrknlog_jni/java/com.marakana.android.lib.log.xml

<xlvrin"."ecdn=uf8?
?m eso=10 noig"t-">
<emsin>
prisos
<irr nm=cmmrkn.nri.i.o"
lbay ae"o.aaaaadodlblg
fl=/ytmfaeokcmmrkn.nri.i.o.a">
ie"sse/rmwr/o.aaaaadodlblgjr/
<prisos
/emsin>

Create A d o d m file for our JNI wrapper
nri.k

device/marakana/alpha-common/framework/mrknlog_jni/java/Android.mk

LCLPT : $cl m-i)
OA_AH = (al ydr

#Bidtelbay
ul h irr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLMDL : cmmrkn.nri.i.o
OA_OUE = o.aaaaadodlblg
LCLSCFLS: $cl aljv-ie-ne,)
OA_R_IE = (al l-aaflsudr.
LCLJV_IRRE : cr
OA_AALBAIS = oe
LCLN_TNADLBAIS: tu
OA_OSADR_IRRE = re
icue$BIDJV_IRR)
nld (UL_AALBAY

#Bidtedcmnain
ul h ouetto
icue$CERVR)
nld (LA_AS
LCLSCFLS: $cl alsbi-aafls $cl alsbi-tlfls
OA_R_IE = (al l-udrjv-ie) (al l-udrhm-ie)
LCLMDL: cmmrkn.nri.i.o_o
OA_OUE= o.aaaaadodlblgdc
LCLDODO_PIN : cmmrkn.nri.i.o
OA_RIDCOTOS = o.aaaaadodlblg
LCLMDL_LS : JV_IRRE
OA_OUECAS = AALBAIS
LCLDODO_S_TNADDCE : tu
OA_RIDCUESADR_OLT = re
icue$BIDDODO)
nld (UL_RIDC

#Cp cmmrkn.nri.i.o.m t /ytmecprisos
oy o.aaaaadodlblgxl o sse/t/emsin/
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLMDL : cmmrkn.nri.i.o.m
OA_OUE = o.aaaaadodlblgxl
LCLMDL_LS : EC
OA_OUECAS = T
LCLMDL_AH: $TRE_U_T)prisos
OA_OUEPT = (AGTOTEC/emsin
LCLSCFLS: $LCLMDL)
OA_R_IE = (OA_OUE
icue$BIDPEUL)
nld (UL_RBIT

Create the JNI header file
$jvh-n
aa ji
- dvc/aaaaapacmo/rmwr/rno_n/n/
d eiemrkn/lh-omnfaeokmklgjiji
-lspt
casah
ottre/omnojJV_IRRE/o.aaaaadodlblgitreits
u/agtcmo/b/AALBAIScmmrkn.nri.i.o_nemdae/
cassjr
lse.a
cmmrkn.nri.i.o.iLg
o.aaaaadodlblgLbo

Check that you got the right JNI header
common/framework/mrknlog_jni/jni/com_marakana_android_lib_log_LibLog.h
…

JIXOTvi JIALJv_o_aaaaadodlblgLbo_lsLg
NEPR od NCL aacmmrkn_nri_i_o_iLgfuho
(NEv,jls)
JIn* cas;
…
JIXOTjn JIALJv_o_aaaaadodlblgLbo_eTtloSz
NEPR it NCL aacmmrkn_nri_i_o_iLggtoaLgie
(NEv,jls)
JIn* cas;
…
JIXOTjn JIALJv_o_aaaaadodlblgLbo_eUeLgie
NEPR it NCL aacmmrkn_nri_i_o_iLggtsdoSz
(NEv,jls)
JIn* cas;
…

Implement the header file, wrapping calls to our l b r n o shared library
imklg
dvc/aaaaapacmo/
eiemrkn/lh-omn
faeokmklgjijicmmrkn_nri_i_o_iLgc
rmwr/rno_n/n/o_aaaaadodlblgLbo.

nri.k
device/marakana/alpha-common/framework/mrknlog_jni/jni/Android.mk
LCLPT: $cl m-i)
OA_AH= (al ydr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLSCFLS: cmmrkn_nri_i_o_iLgc
OA_R_IE = o_aaaaadodlblgLbo.
LCLCICUE + $JIHICUE $LCLPT)./../i/imklg
OA__NLDS = (N__NLD) (OA_AH/../.lblbrno
LCLSAE_IRRE : lbrno
OA_HRDLBAIS = imklg
LCLMDL : lbrno_n
OA_OUE = imklgji
LCLPEIKMDL : fle
OA_RLN_OUE = as
icue$BIDSAE_IRR)
nld (UL_HRDLBAY

Register this module with a p a m file
lh.k
…
POUTPCAE +
RDC_AKGS =
cmmrkn.nri.i.o
o.aaaaadodlblg
cmmrkn.nri.i.o.m
o.aaaaadodlblgxl
lbrno_n
imklgji

Build the device
$mk -1
ae j0
…
tre Peul:cmmrkn.nri.i.o.m
agt rbit o.aaaaadodlblgxl
(u/agtpoutapaojECcmmrkn.nri.i.o.m_nemdae
ottre/rdc/lh/b/T/o.aaaaadodlblgxlitreits
/o.aaaaadodlblgxl
cmmrkn.nri.i.o.m)

…
Isal ottre/rdc/lh/ytmlblbrno_n.o
ntl: u/agtpoutapasse/i/imklgjis
…

Verify it works via our M i . a n )test code
anmi(

#(esatteeuao
r)tr h mltr
$euao -enlottre/rdc/lh/enl&
mltr kre u/agtpoutapakre
#wi frteeuao t fns
at o h mltr o iih
#cekotorJv lbay
hc u u aa irr
$absell - /ytmfaeokcmmrkn.nri.i.o.a
d hl s l sse/rmwr/o.aaaaadodlblgjr
-wr-- ro
r--r- ot ro
ot 17 21-71 0:1
41 010-1 00
cmmrkn.nri.i.o.a
o.aaaaadodlblgjr
#cekotorJv lbayrgsr fl
hc u u aa irr eity ie
$absell - /ytmecprisoscmmrkn.nri.i.o.m
d hl s l sse/t/emsin/o.aaaaadodlblgxl
-wr-- ro
r--r- ot ro
ot 1921-71 2:7
7 010-0 35
cmmrkn.nri.i.o.m
o.aaaaadodlblgxl
#cekotorJIsae lbay
hc u u N hrd irr
$absell - /ytmlblbrno_n.o
d hl s l sse/i/imklgjis
-wr-- ro
r--r- ot ro
ot 59 21-71 0:1lbrno_n.o
26 010-1 14 imklgjis
#ceki oruiiyi digwa i i spoe t
hc f u tlt s on ht t s upsd o
$ablga -
d oct g
/e/o/an rn bfe i 6K (3bcnue) mxetyi 49b mx
dvlgmi: ig ufr s 4b 3K osmd, a nr s 06, a
pyodi 47b
ala s 06
#nwrnorJv lbaysMi.an)b drcl ivkn teDli V
o u u aa irr' anmi( y iety noig h avk M
$abseldliv -p/ytmfaeokcmmrkn.nri.i.o.a
d hl avkm c sse/rmwr/o.aaaaadodlblgjr
cmmrkn.nri.i.o.an
o.aaaaadodlblgMi
Fuhdlg Peiul i wscnuig336o 656bts
lse o. rvosy t a osmn 44 f 53 ye
#cekaan
hc gi
$ablga -
d oct g
/e/o/an rn bfe i 6K (K cnue) mxetyi 49b mx
dvlgmi: ig ufr s 4b 0b osmd, a nr s 06, a
pyodi 47b
ala s 06
$abseldliv -p/ytmfaeokcmmrkn.nri.i.o.a
d hl avkm c sse/rmwr/o.aaaaadodlblgjr
cmmrkn.nri.i.o.an
o.aaaaadodlblgMi
Fuhdlg Peiul i wscnuig27o 656bts
lse o. rvosy t a osmn 1 f 53 ye
#go :)
od -

Marakana Alpha Service Interface

Marakana Alpha Service Interface Steps
28.1. Because other apps are going to want to use our service as well.
Create directory structure for our m k l g e v c
rnosrie

$mdrdvc/aaaaapa
ki p eiemrkn/lh-
cmo/rmwr/rnosriecmmrkn/nri/evc/o
omnfaeokmklgevc/o/aaaaadodsrielg

Create the interface L g e v c . i lfile
oSriead
dvc/aaaaapacmo/
eiemrkn/lh-omn
faeokmklgevc/o/aaaaadodsrielgIoSriead
rmwr/rnosriecmmrkn/nri/evc/o/Lgevc.il

Create L g a a e . a aproxy to our bound service
oMngrjv
dvc/aaaaapacmo/
eiemrkn/lh-omn
faeokmklgevc/o/aaaaadodsrielgLgaae.aa
rmwr/rnosriecmmrkn/nri/evc/o/oMngrjv

Expose L g a a e . a aas a Java library
oMngrjv
common/framework/mrknlogservice/com.marakana.android.service.log.xml

<xlvrin"."ecdn=uf8?
?m eso=10 noig"t-">
<emsin>
prisos
<irr nm=cmmrkn.nri.evc.o"
lbay ae"o.aaaaadodsrielg
fl=/ytmfaeokcmmrkn.nri.evc.o.a">
ie"sse/rmwr/o.aaaaadodsrielgjr/
<prisos
/emsin>

Create A d o d m file for m k l g e v c
nri.k rnosrie
device/marakana/alpha-common/framework/mrknlogservice/Android.mk
LCLPT : $cl m-i)
OA_AH = (al ydr

#Bidtelbay
ul h irr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLMDL : cmmrkn.nri.evc.o
OA_OUE = o.aaaaadodsrielg
LCLSCFLS: $cl aljv-ie-ne,)
OA_R_IE = (al l-aaflsudr.
LCLSCFLS+ cmmrkn/nri/evc/o/Lgevc.il
OA_R_IE = o/aaaaadodsrielgIoSriead
LCLJV_TTCLBAIS: adodcmo
OA_AASAI_IRRE = nri-omn
LCLJV_IRRE : cr
OA_AALBAIS = oe
icue$BIDJV_IRR)
nld (UL_AALBAY

#Bidtedcmnain
ul h ouetto
icue$CERVR)
nld (LA_AS
LCLSCFLS: $cl alsbi-aafls $cl alsbi-tlfls
OA_R_IE = (al l-udrjv-ie) (al l-udrhm-ie)
LCLMDL: cmmrkn.nri.evc.o_o
OA_OUE= o.aaaaadodsrielgdc
LCLDODO_PIN : cmmrkn.nri.evc.o
OA_RIDCOTOS = o.aaaaadodsrielg
LCLMDL_LS : JV_IRRE
OA_OUECAS = AALBAIS
LCLDODO_S_TNADDCE : tu
OA_RIDCUESADR_OLT = re
icue$BIDDODO)
nld (UL_RIDC

#Cp cmmrkn.nri.evc.o.m t /ytmecprisos
oy o.aaaaadodsrielgxl o sse/t/emsin/
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLMDL : cmmrkn.nri.evc.o.m
OA_OUE = o.aaaaadodsrielgxl
LCLMDL_LS : EC
OA_OUECAS = T
LCLMDL_AH: $TRE_U_T)prisos
OA_OUEPT = (AGTOTEC/emsin
LCLSCFLS: $LCLMDL)
OA_R_IE = (OA_OUE
icue$BIDPEUL)
nld (UL_RBIT

Add it to a p a m file
lh.k

…
POUTPCAE +
RDC_AKGS =
cmmrkn.nri.evc.o
o.aaaaadodsrielg
cmmrkn.nri.evc.o.m
o.aaaaadodsrielgxl

Verify that the device builds okay
$mk -1 cmmrkn.nri.evc.o
ae j0 o.aaaaadodsrielg
cmmrkn.nri.evc.o.m
o.aaaaadodsrielgxl
…
tre Peul:cmmrkn.nri.evc.o.m
agt rbit o.aaaaadodsrielgxl
…
Isal
ntl:
ottre/rdc/lh/ytmecprisoscmmrkn.nri.evc.o
u/agtpoutapasse/t/emsin/o.aaaaadodsrielg
.m
xl
…
Ad:cmmrkn.nri.evc.o < dvc/aaaaapa
il o.aaaaadodsrielg = eiemrkn/lh-
cmo/rmwr/rnosriecmmrkn/nri/evc/o/Lgevc.i
omnfaeokmklgevc/o/aaaaadodsrielgIoSriead
l
…
tre Jr cmmrkn.nri.evc.o
agt a: o.aaaaadodsrielg
…
Isal
ntl:

ottre/rdc/lh/ytmfaeokcmmrkn.nri.evc.o.a
u/agtpoutapasse/rmwr/o.aaaaadodsrielgjr
…

Marakana Alpha Service App Steps
31.1. Register the service with the Service Manager so others can use it.
Create the directory structure for our code

$mdrdvc/aaaaapacmo/p
ki eiemrkn/lh-omnap

Create main A d o d m file
nri.k
device/marakana/alpha-common/app/Android.mk

icue$cl alsbi-aeie)
nld (al l-udrmkfls

Create A d o d a i e t x lfile for our server app
nriMnfs.m
dvc/aaaaapacmo/p/rnoSrieAdodaietxl
eiemrkn/lh-omnapMkLgevc/nriMnfs.m

Provide I o S r i e m l j v implementation for our service
LgevcIp.aa
dvc/aaaaapacmo/
eiemrkn/lh-omn
apMkLgevc/r/o/aaaaadodlgevc/LgevcIp.aa
p/rnoSriesccmmrkn/nri/osrieIoSriemljv

Register L g e v c A pwith S r i e a a e
oSriep evcMngr
dvc/aaaaapa
eiemrkn/ lh-
cmo/p/rnoSriesccmmrkn/nri/osrieLgevcApjv
omnapMkLgevc/r/o/aaaaadodlgevc/oSriep.aa

Create the A d o d m file
nri.k
device/marakana/alpha-common/app/MrknLogService/Android.mk
LCLPT: $cl m-i)
OA_AH= (al ydr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLSCFLS: $cl aljv-ie-ne,r)
OA_R_IE = (al l-aaflsudrsc
LCLRQIE_OUE :
OA_EURDMDLS =
cmmrkn.nri.evc.o
o.aaaaadodsrielg
cmmrkn.nri.i.o
o.aaaaadodlblg
LCLJV_IRRE :
OA_AALBAIS =
cmmrkn.nri.evc.o
o.aaaaadodsrielg
cmmrkn.nri.i.o
o.aaaaadodlblg
cr
oe
faeok
rmwr
LCLPCAENM : MkLgevc
OA_AKG_AE = rnoSrie
LCLSKVRIN: cret
OA_D_ESO = urn

LCLPOUR_NBE : dsbe
OA_RGADEALD = iald
LCLCRIIAE: pafr
OA_ETFCT = ltom
icue$BIDPCAE
nld (UL_AKG)

Register our service app with a p a m file
lh.k

…
POUTPCAE + MkLgevc
RDC_AKGS = rnoSrie

Build the device

$mk -1
ae j0
…
Isal ottre/rdc/lh/ytmapMkLgevc.p
ntl: u/agtpoutapasse/p/rnoSrieak
…

Marakana Alpha Client App Steps
34.1. A demo client app - to make sure it all works.
Create directory structure for our M k L g e v c C i n app
rnoSrielet

$mdrdvc/aaaaapaapMkLgevcCin
ki eiemrkn/lh/p/rnoSrielet
$mdrdvc/aaaaapaapMkLgevcCin/e
ki eiemrkn/lh/p/rnoSrieletrs
$mdrdvc/aaaaapaapMkLgevcCin/e/aus
ki eiemrkn/lh/p/rnoSrieletrsvle
$mdrdvc/aaaaapaapMkLgevcCin/e/aot
ki eiemrkn/lh/p/rnoSrieletrslyu
$mdrdvc/aaaaapaapMkLgevcCin/r
ki eiemrkn/lh/p/rnoSrieletsc
$mdr-
ki p
dvc/aaaaapaapMkLgevcCin/r/o/aaaaadodlgev
eiemrkn/lh/p/rnoSrieletsccmmrkn/nri/osri
ccin
elet

Create L g c i i y j v
oAtvt.aa
dvc/aaaaapa
eiemrkn/lh/
apMkLgevcCin/r/o/aaaaadodlgevccin/oAtvt.a
p/rnoSrieletsccmmrkn/nri/osrieletLgciiyj

Create A d o d a i e t x lfile
nriMnfs.m
dvc/aaaaapaapMkLgevcCin/nriMnfs.m
eiemrkn/lh/p/rnoSrieletAdodaietxl

nri.k
device/marakana/alpha/app/MrknLogServiceClient/Android.mk

LCLPT: $cl m-i)
OA_AH= (al ydr
icue$CERVR)
nld (LA_AS
LCLMDL_AS: otoa
OA_OUETG = pinl
LCLSCFLS: $cl aljv-ie-ne,r)
OA_R_IE = (al l-aaflsudrsc
LCLJV_IRRE : cmmrkn.nri.evc.o
OA_AALBAIS = o.aaaaadodsrielg
LCLPCAENM : MkLgevcCin
OA_AKG_AE = rnoSrielet
LCLSKVRIN: cret
OA_D_ESO = urn
LCLPOUR_NBE : dsbe
OA_RGADEALD = iald
icue$BIDPCAE
nld (UL_AKG)

Register M k L g e v c C i n with main makefile f l _ l h . m
rnoSrielet ulapaxl
device/marakana/alpha/full_alpha.mk
…
POUTPCAE + MkLgevcCin
RDC_AKGS = rnoSrielet

Build entire device

$mk -1
ae j0
…

Verify it all works
Run the MrknLogServiceClient app and try to flush the log.

Marakana Alpha SDK Add-On
35.1. Other developers may want to develop for our cool Alpha device as well.
Create directory structure

$mdrdvc/aaaaapaskadnsis
ki eiemrkn/lh-d_do/kn
$c - skeuao/kn/VAdvc/aaaaapa
p r d/mltrsisHG eiemrkn/lh-
skadnsisMkHgMp
d_do/kn/rnvadi

Create portrait layout background
We took a standard one and just added our logo.

Create landscape layout background
Same as with the previous image, just add a logo.

Define h r w r . n file
adaeii
device/marakana/alpha-sdk_addon/hardware.ini

#Cso hrwr otosfrteado.
utm adae pin o h d-n
#Poete dfndhr ipc alADtreigti ado.
rpris eie ee mat l V agtn hs d-n
#Ec si cnas oerd toevle wt isonhrwr.n fl.
ah kn a lo vrie hs aus ih t w adaeii ie
v.epie=2
mhaSz 4

Create SDK Add-on m n f s . n file
aietii
device/marakana/alpha-sdk_addon/manifest.ini

nm=lh AdO
aeApa d-n
vno=aaaa
edrMrkn
dsrpinMrkn ApaAdo
ecito=aaaa lh d-n
ai1
p=0
rvso=
eiin1
lbaiscmmrkn.nri.i.o;o.aaaaadodsrielg
irre=o.aaaaadodlblgcmmrkn.nri.evc.o
cmmrkn.nri.i.o=o.aaaaadodlblgjrMrkn Lg
o.aaaaadodlblgcmmrkn.nri.i.o.a;aaaa o
Lbay
irr
cmmrkn.nri.evc.o=o.aaaaadodsrielgjrMrkn
o.aaaaadodsrielgcmmrkn.nri.evc.o.a;aaaa
LgSrie
o evc
si=rnvadi
knMkHgMp

Define classes to be included
device/marakana/alpha-sdk_addon/alpha_sdk_addon_stub_defs.txt

+o.aaaaadodlblg*
cmmrkn.nri.i.o.
-o.aaaaadodlblgMi
cmmrkn.nri.i.o.an
+o.aaaaadodsrielg*
cmmrkn.nri.evc.o.

Create main a p a s k a d n m makefile for Alpha SDK Add-on
lh_d_do.k
device/marakana/alpha-sdk_addon/alpha_sdk_addon.mk

#Icuetecmo suf
nld h omn tf
icuedvc/aaaaapacmo/lh.k
nld eiemrkn/lh-omnapam

#Ls o mdlst icuei teteado sse iae
it f oue o nld n h h d-n ytm mg
POUTPCAE +
RDC_AKGS =
cmmrkn.nri.i.o_o
o.aaaaadodlblgdc
cmmrkn.nri.evc.o_o
o.aaaaadodsrielgdc

#Tenm o ti ado (o teSK
h ae f hs d-n fr h D)
POUTSKADNNM : mrkn_lh_do
RDC_D_DO_AE = aaaaapaadn

#Cp tefloigflsfrti ado' SK
oy h olwn ie o hs d-ns D
POUTSKADNCP_IE :
RDC_D_DO_OYFLS =
$LCLPT)mnfs.n:aietii
(OA_AH/aietiimnfs.n
$LCLPT)hrwr.n:adaeii
(OA_AH/adaeiihrwr.n
$cl fn-oysbi-ie,
(al idcp-udrfls*
,(OA_AH/kn/rnvadisisMkHgMp)
$LCLPT)sisMkHgMp,kn/rnvadi

#Cp tejrflsfrtelbais(Ps epsdi ti ado' SK
oy h a ie o h irre AI) xoe n hs d-ns D
POUTSKADNCP_OUE :
RDC_D_DO_OYMDLS =
cmmrkn.nri.i.o:iscmmrkn.nri.i.o.a
o.aaaaadodlblglb/o.aaaaadodlblgjr

cmmrkn.nri.evc.o:iscmmrkn.nri.evc.o.a
o.aaaaadodsrielglb/o.aaaaadodsrielgjr

POUTSKADNSU_ES: $LCLPT)apaskadnsu_estt
RDC_D_DO_TBDF = (OA_AH/lh_d_do_tbdf.x

#Dfn tenm o tedcmnaint gnrt frti ado' SK
eie h ae f h ouetto o eeae o hs d-ns D
POUTSKADNDCMDL :
RDC_D_DO_O_OUE =
cmmrkn.nri.evc.o_o
o.aaaaadodsrielgdc

#Sneteado i a euao,w as ne t epiil cp tekre t
ic h d-n s n mltr e lo ed o xlcty oy h enl o
iae
mgs
POUTSKADNCP_IE + $LCLKRE)iae/enlqm
RDC_D_DO_OYFLS = (OA_ENL:mgskre-eu

#Ti ado etnstedfutskpout
hs d-n xed h eal d rdc.
$cl ihrtpout $SCTRE_I)poutskm)
(al nei-rdc, (R_AGTDR/rdc/d.k

#Tenm o ti ado (o tebidsse)
h ae f hs d-n fr h ul ytm
#Ue'aePOUT<RDC_AE-d_do't bidtea ado,
s mk RDC-POUTNM>skadn o ul h n d-n
#s i ti cs,w wudrn'aePOUTmrkn_lh_do-d_do'
o n hs ae e ol u mk RDC-aaaaapaadnskadn
POUTNM : mrkn_lh_do
RDC_AE = aaaaapaadn
POUTDVC : apa
RDC_EIE = lh
POUTMDL: Mrkn ApaSKAdnIaefrEuao
RDC_OE = aaaa lh D do mg o mltr

Create main A d o d r d c s m listing other makefiles
nriPout.k
device/marakana/alpha-sdk_addon/AndroidProducts.mk
POUTMKFLS: $LCLDR/lh_d_do.k
RDC_AEIE = (OA_I)apaskadnm

Create top-level makefile
device/marakana/alpha-sdk_addon/Android.mk
icue$cl alsbi-aeie)
nld (al l-udrmkfls

Build the SDK Add-on
$mk -1 POUTmrkn_lh_do-d_do
ae j0 RDC-aaaaapaadnskadn
…
PcaigSKAdn oths/iu-8/d_do/aaaaapaadn
akgn D do: u/otlnxx6skadnmrkn_lh_do-
egsuetlnxx6zp
n.tdn-iu-8.i

Check that Marakana Alpha shows in Android SDK Manager
Start the Android SDK Manager to see all available Add-ons.

Create new AVD based on Marakana Alpha
From the Android AVD Manager, create new AVD using Alpha as the target.

Verify the new AVD boots up with right ROM image
Start the new AVD. You should see all of the modifications we’ve done.

Remixing Android Summary
Thank you!
Marko Gargenta & Marakana Team
@MarkoGargenta
Special thanks to Aleksandar (Sasa) Gargenta for providing most of the research on how to
put together Marakana Alpha, properly.
Slides & video of this presentation is available at Marakana.com
(c) Marakana.com

Marko Gargenta_Remixing android

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