Embedded Android Talk @ Mobile Tec Con 2013 #mtc13

1. Dominik Helleberg | inovex GmbH
Embedded Android

2. Dominik Helleberg
Mobile Development
Android
Ingress Level 7
http://dominik-helleberg.de/+

3. Embedded Android?
http://developer.android.com/design/index.html

5. https://twitter.com/Arubin/status/27808662429

6. Why?

7. http://commons.wikimedia.org/wiki/File:Helvar_Touchscreen_924.jpg

8. http://ajaishukla.blogspot.de/2009/03/visit-to-ins-shivalik-indias-newest.html

9. http://commons.wikimedia.org/wiki/File:Rh%C3%A4tische_Bahn_kaartlezer.JPG

14. Apps
Java
Kernel
Libs HAL Init
Framework / API
System Services
Dalvik / Runtime / Zygote

16. Tooling
Libraries
User Interface
Developers
Open Source
Hardware Support
Technology Architecture

17. http://e.ubmelectronics.com/2013EmbeddedStudy/index.html

18. http://e.ubmelectronics.com/2013EmbeddedStudy/index.html

19. Stock Apps
Framework / API
User Apps
Java
System Services
Dalvik / Runtime / Zygote
Kernel
Libs HAL Init

20. Stock Apps
Framework / API
User Apps
Java
System Services
Dalvik / Runtime / Zygote
Kernel
Libs Init
https://android.googlesource.com/
HAL

21. Architecture by example - GPS
Stock Apps
Framework / API
User Apps
Java
System Services
Dalvik / Runtime / Zygote
Kernel
Libs HAL Init

22. Architecture by example - GPS
Stock Apps User Apps
locationManager = (LocationManager)
this.getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0,
locationListener);

23. frameworks/base/location/java/android/location/
LocationManager.java
Architecture by example - GPS
Framework / API System Services
try {
mService.requestLocationUpdates(request,
transport, intent, packageName);
} catch (RemoteException e) {
Log.e(TAG, "RemoteException", e);
}

24. frameworks/base/location/java/android/location/
LocationManager.java
private final ILocationManager mService;
Architecture by example - GPS
Framework / API System Services

25. frameworks/base/location/java/android/location/
ILocationManager.aidl
Architecture by example - GPS
Framework / API System Services
void requestLocationUpdates(
in LocationRequest request,
in ILocationListener listener,
in PendingIntent intent,
String packageName);

26. frameworks/base/services/java/com/android/server/
LocationManagerService.java
LocationProviderInterface provider =
mProvidersByName.get(name);
...
provider.setRequest(providerRequest,
worksource);
Architecture by example - GPS
Framework / API System Services

27. frameworks/base/services/java/com/android/server/
location/GpsLocationProvider.java
private native boolean native_start();
Architecture by example - GPS
Framework / API System Services

28. hardware/libhardware/include/hardware/gps.h
/** Represents the standard GPS interface. */
typedef struct {
int (*init)( GpsCallbacks* callbacks );
/** Starts navigating. */
int (*start)( void );
...
Architecture by example - GPS
Libs HAL Init

29. development/tools/emulator/system/gps/
gps_qemu.c
device/samsung/manta/gps/gps.exynos5.so
Architecture by example - GPS
Libs HAL Init

30. Apps
Java
Kernel
Libs HAL Init
Framework / API
System Services
Dalvik / Runtime / Zygote

32. § Freescale BSP
§ 7 GB Source
§ Compile Time ~ 45 minutes
§ „Deployment Time“ ~ 5-10
minutes
§ Dependencies ususally fail at
runtime
§ You can change everything...
Maybe you shouldn‘t ;)

33. § Custom WiFi
§ Custom Recovery
§ New APIs for eINK Display
§ Custom USB and Storage
§ System updates
§ Boot time optimization
§ Battery Life Management

34. § Custom WiFi
§ Custom Recovery
§ New APIs for eINK Display
§ Custom USB and Storage
§ System updates
§ Boot time optimization
§ Battery Life Management

35. New APIs for eINK Display
§ 300 – 900 ms refresh
§ Update Modes to reduce ghosting
http://commons.wikimedia.org/wiki/File:EInk_Refresh.gif
http://commons.wikimedia.org/wiki/File:EInk_simplified.png

36. Custom USB and Storage
Internal
SD-Card
Ext.
SD-
Card
USB

37. invalidate()
externalStorage()
TolinoApp
Auth | Shop | Cloud-Storage | Settings | WiFi Auth | Local Storage
Java
Kernel
Libs HAL Init
Framework / API
System Services
Dalvik / Runtime / Zygote

38. bootloader
kernel
init
service
manager
zygote
daemons
boot
animiation
System
Server
Package
Manager
Activity
Manager
Power
Manager
...
launcher

40. bootloader
kernel
init
service
manager
zygote
daemons
boot
animiation
System
Server
Package
Manager
Activity
Manager
Power
Manager
...
launcher

42. /sys/devices/system/cpu/cpuX/cpufreq/stats/time_in_state
160000
632455
400000
781
800000
8825
deepSleepTime
=
SystemClock.elapsedRealtime()
-­‐
(Σ
(all
cpu_states));
deepSleepTime
=
SystemClock.elapsedRealtime()
-­‐
SystemClock.uptimeMillis();

43. $
adb
shell
dumpsys
batteryinfo
....
Statistics
since
last
charge:
System
starts:
0,
currently
on
battery:
false
Time
on
battery:
4d
0h
38m
8s
373ms
(5,3%)
realtime,
5m
55s
182ms
(0,0%)
uptime
Total
run
time:
75d
13h
54m
39s
222ms
realtime,
5h
16m
0s
646ms
uptime,
Screen
on:
5m
46s
126ms
(0,1%),
Input
events:
0,
Active
phone
call:
0ms
(0,0%)
Screen
brightnesses:
dark
8s
614ms
(2,5%),
medium
5m
37s
512ms
(97,5%)
Kernel
Wake
lock
"PowerManagerService":
5s
613ms
(25
times)
realtime
Kernel
Wake
lock
"alarm":
1s
676ms
(9
times)
realtime
Kernel
Wake
lock
"android_usb":
2s
222ms
(1
times)
realtime
Kernel
Wake
lock
"power-­‐supply":
13ms
(1
times)
realtime
Kernel
Wake
lock
"KeyEvents":
93ms
(449
times)
realtime
Kernel
Wake
lock
"main":
5m
46s
194ms
(1
times)
realtime
Total
received:
0B,
Total
sent:
0B
Total
full
wakelock
time:
0ms
,
Total
partial
waklock
time:
5s
576ms
Signal
levels:
No
activity
Signal
scanning
time:
0ms
Radio
types:
No
activity
Radio
data
uptime
when
unplugged:
0
ms
Wifi
on:
0ms
(0,0%),
Wifi
running:
0ms
(0,0%),
Bluetooth
on:
0ms
(0,0%)

44. $
adb
shell
bugreport
>
bugreport.txt
$
java
-­‐jar
chkbugreport-­‐0.4-­‐185.jar
bugreport.txt
https://github.com/sonyxperiadev/ChkBugReport

47. http://beagleboard.org/Products/BeagleBone%20Black

48. http://www.oreilly.de/catalog/9781449308292/index.html

49. Credits
http://www.ouya.tv/about/
https://mediacenter.motorola.com/Image-Gallery/MOTOACTV-Golf-Edition-8c1.aspx
http://www.tolino.de
https://www.honeywellaidc.com/en-US/resources/image-library/Pages/default.aspx?
Category=7800&keywords=7800&title=7800&description=7800
https://android-build.linaro.org/
http://source.android.com/source/building.html
http://nvidianews.nvidia.com/Releases/NVIDIA-Untethers-Gaming-With-Project-
SHIELD-8ee.aspx
http://www.android-user.de/Apps/Auerswald-Comfortel-3500-Das-IP-Telefon-mit-
Android-2.3-im-Test

50. DANKE!