Customing Android: Looking inside the droids belly Embedded Android - - PowerPoint PPT Presentation

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Customing Android: Looking inside the droids belly Embedded Android - - PowerPoint PPT Presentation

Nov 17, 2022 473 likes •1.04k views

Customing Android: Looking inside the droids belly Embedded Android Appliances What do I mean by Appliances? appliance / pl ns/ Noun A device designed to perform a specific task, typically a domestic one. Digital Signage

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Customing Android:

Looking inside the droids belly

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Embedded Android Appliances

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What do I mean by Appliances?

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ap·pli·ance /əˈplīəns/ Noun

A device designed to perform a specific task, typically a domestic one.

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Digital Signage Appliances

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Why Embedded Android ?

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Because...

★ Open Source! ★ Very rich platform & APIs ★ Huge industry & community support ★ Wide variety of devices...

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Customisation

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3 Levels

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Levels

  • 1. User
  • 2. Root
  • 3. Platform
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  • 1. User Level Customisation

Things you can do… ★ Use the Home Intent

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Home sweet home

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<activity android:name=".MyHomeActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" />

<category android:name="android.intent.category.HOME"/> <category android:name="android.intent.category.DEFAULT" />

</intent-filter> </activity>

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mi casa es su casa

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  • 1. User Level Customisation

Things you can do… ★ Use the Home Intent ★ Use "public API" Intents (eg. Wifi config)

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Intent intent = new Intent(WifiManager.ACTION_PICK_WIFI_NETWORK); startActivityForResult(intent, 1);

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Oops…\/

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Hang on a sec...

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What would Kirk do ?

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More Clichés...

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packages/Apps/Settings/src/com/and roid/settings/wifi/WifiSettings.java

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Intent intent = new Intent(WifiManager.ACTION_PICK_WIFI_NETWORK); intent.putExtra("only_access_points", true); intent.putExtra(" extra_prefs_show_button_bar ", true); intent.putExtra(" wifi_enable_next_on_connect ", true); intent.putExtra(" extra_prefs_set_next_text ", "Finish"); startActivityForResult(intent, 1);

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Ta-Da!

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  • 2. Root Level Customisation

No soup root for you!

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  • 2. Root Level Customisation

Things you can do… ★ Call Privileged API’s (eg. Reboot Device) ★ Silent OTA app install/updates

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Silent?

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Xposed!

★ Framework for writing modules to... ★ Monkey-patch anything in the Android Java Framework code ★ Modified /system/bin/app_process ★ http://repo.xposed.info

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3 OS-Level Customisation

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A Trilogy in 4 parts

  • 1. User
  • 2. Root
  • 3. OS -> Android Framework
  • 4. OS -> Kernel
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  • 3. OS - Android Customisation

★ Build Android OS yourself

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AOSP and Building Android

★ hundreds of git repos (>400) ★ huge amounts of disk space req'd ★ Ubuntu 12.04 + Oracle JDK ★ >15min on a very fast machine (i7 Quad-core, 8GB, SSDs, hot ccache) ★ and then you need to ‘flash’ img & test on emu/device :-(

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  • 3. OS - Android Customisation

Things you can do… ★ choose which apps to build/ship ★ customise UI (eg. rm Systembar, Battery/Audio-Vol warnings) ★ choose CPU platform (eg. x86 or MIPS instead of ARM) but wait theres more…

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  • 3. OS - Android Customisation

MORE Things you can do… ★ workaround bugs in hardware (eg. bad LCD EDID) ★ control the platform - use your own signing certs

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A tale of 2 bars (ICS)

packages/SystemUI/src/com/android/systemui/statusbar/Statu sBar.java public void start() { … sb = makeStatusBarView(); AND tablet/TabletStatusBar.java public void start() { ... sb.setVisibility(View.GONE);

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JB & KK ?

★ Exercise for the reader… ★ Tip: GREP is your Friend

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  • 4. OS - Kernel

★ device drivers, eg. custom touchscreens, wifi cards, etc ★ specific hardware / optimisation,

  • eg. run on RPi's !
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  • X. Boss Level - Recovery/Bootloaders!

★ CWM - Popular community recovery img ★ Fastboot - open protocol for ‘talking’ to bootloaders over usb (think “adb for bootloaders”)

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Lights, Camera, Action!

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Sensors

★ Camera, Gyro, Accel, Compass ★ Sonar, IR, Lidar, Temp

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Outputs

★ Lights ★ Environment control (temperature)

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Comms

★ USB ★ ADK ★ Bluetooth (LE) ★ Audio jack

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USB

You might want to get rid of this...

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ADK

"I put my thing down, flip it, and reverse it"

  • "Work It" (Missy Elliot)
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Bluetooth LE

★ Fix it! (lots of bugs in 4.3 and early 4.4’s) ★ Advertise it! (API is coming in “L” release) ★ Tone it down! (several lines on logcat output per LE event)

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Audio Jack ?!?!

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Bonus UART!

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But...

Also don’t want this...

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References

THE book! Also..

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Image Credits

digital signage examples-brightsideonews read the src luke" - Coding Horror Blog, Jeff Atwood "android welcome wizard" - geeksquad.co.uk “audio jack dev board" - NXP "build lights - wikipedia" "audio volume warning" - android bug tracker "usb permissions dialog - phidgets" missy elliost cover - wikipedia nexus4-uart - hackaday

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Thank You!

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Questions?

http://manichord.com github.com/maks @mklin https://plus.google.com/+MaksimLin