Build your own OS based on Android

A presentation about the basics how to build our own mobile operating system based on Android Open Source Project

Transcript

1. Build your own OS based on Android
2. Introduction
3. About me Michał Górny @michalgie
4. Albert "Albert is an Android-based tablet with an integrated encrypting PIN pad, contactless card reader, mag stripe reader, chip card reader and receipt printer. It´s an easy-to-use, multifunctional tablet which runs productivity apps, takes secure cashless payments from any card or mobile device, and is EMV and PCI PTS- certified."
5. What am I doing here?
6. "The Single Best Thing You Can Do For Your Career" Public speaking * http://www.donnfelker.com/the-single-best-thing-you-can-do-for-your-career
7. Agenda What is it How to build How to develop Let's code Share with the world
8. Android vs AOSP
10. AOSP Android is an open source software stack for a wide range of mobile devices and a corresponding open source project led by Google.
11. Software Stack
12. Numbers 518 repositories
13. Numbers 48 mln lines of code
14. Numbers 27 languages
15. Languages C 30% C++ 25% xml 20% java 18% python asm sh objc perl exp cs fortran lisp yacc pascal ruby lex ml awk ada php cobol sed tcl haskell csh jsp
16. Person / year 16 075
17. Person / month 192 905
18. 21 years Schedule estimate
19. $ 2,171,571,352 Cost
20. Codelines, Branches & Releases
21. http://developers.google.com/android/images Nexus binaries
22. http://s.android.com/source/build-numbers.html Branches
23. Build on my own
24. Requirements
25. Hardware 64 bit environment 100GB checkout 150GB single build 200GB multiple build 16GB ram swap (Linux) Software Linux / Mac OS OpenJDK 8 GNU Make 3.81 – 3.82 Python 2.6 – 2.8 Git 1.7 or newer Proprietary binaries
26. Establishing environment Choose a branch Install required packages Configure USB access Create a case-sensitive disk image (*Mac OS) Setup ccache
27. Downloading the source Install repo Initialise repo client Synchronise repository Take a coffee break :)
28. Preparing to build Download proprietary binaries (CPU, GPU) Set up environment Choose a target (user, userdebug, eng) Build the code
29. make -j4
31. ### make completed successfully (02:27:48 (hh:mm:ss)) ####
32. Build time
33. Intel® Core™ i7-4720HQ CPU 2.60GHz × 8 RAM 32 GB 02:27:48 04:47:47 Intel® Core™ i5-4288U CPU 2.60GHz × 4 RAM 16 GB * use ccache 48:01* 02:03:31*
34. Testing a build
35. Booting into fastboot mode adb reboot bootloader Testing a build
36. fastboot oem unlock Booting into fastboot mode Unlocking the bootloader Testing a build
37. fastboot flashall -w Booting into fastboot mode Unlocking the bootloader Flashing Testing a build
38. Development
39. Smartphone for Seniors
40. Smartphone for Seniors
41. SOS button
42. SOS button Access from power dialog
43. SOS button Access from power dialog Long press emergency
44. SOS button Access from power dialog Long press emergency Dial SOS number
45. Code or it didn't happen
46. frameworks/base/core/java/com/android/internal/policy/SOSCallManager.java public class SOSCallManager { ... private void sendCallIntent() { Intent intent = new Intent(Intent.ACTION_CALL); intent.setData(getPhoneUri()); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); mContext.startActivity(intent); } private Uri getPhoneUri() { return Uri.fromParts("tel", getNumber(), null); } ... private String getNumber() { return Settings.Global.getString mContext.getContentResolver(), Settings.Global.SOS_CALL_NUMBER); }
47. frameworks/base/packages/Keyguard/src/com/android/keyguard/EmergencyButton.java setOnLongClickListener(new OnLongClickListener() { @Override public boolean onLongClick(View v) { if (!mLongPressWasDragged) { ... } else if (mSOSCallManager.isNumberSet()) { mSOSCallManager.performSOSCall(); return true; } }
48. frameworks/base/services/core/java/com/android/server/policy/GlobalActions.java /** * Show the global actions dialog (creating if necessary) * @param keyguardShowing True if keyguard is showing */ public void showDialog(boolean keyguardShowing, boolean isDeviceProvisioned) { ... /** * Create the global actions dialog. * @return A new dialog. */ private GlobalActionsDialog createDialog() { ... } else if (GLOBAL_ACTION_KEY_SOS_CALL.equals(actionKey)) { if (!TextUtils.isEmpty(Settings.Global.getString( mContext.getContentResolver(), Settings.Global.SOS_CALL_NUMBER))) { mItems.add(getSOSAction()); } }
49. private Action getSOSAction() { return new SinglePressAction(com.android.internal.R.drawable.emergency_icon, R.string.global_action_sos_button) { @Override public void onPress() { mSOSCallManager.performSOSCall(); } @Override public boolean showDuringKeyguard() { return true; } @Override public boolean showBeforeProvisioning() { return false; } }; } frameworks/base/services/core/java/com/android/server/policy/GlobalActions.java
50. https://github.com/michalgorny/platform_frameworks_base/commit/8723f88
51. Rebuild
52. make -j4 framework services SystemUI
53. Upload
54. adb remount adb sync adb reboot
55. Demo
56. Change a number
57. adb shell settings put global sos_call_number <number>
58. Live coding
59. Issue In an Emergency information settings add a preference to edit a number to perform a SOS call
60. Import to IDE make idegen && development/tools/idegen/idegen.sh Open android.ipr
61. https://github.com/michalgorny/platform_packages__apps_emergencyinfo/commit/812a49e
62. Contribution
63. https://android-review.googlesource.com Gerrit
64. https://cla.developers.google.com/about/google-individual Contributor License Agreements
65. https://android.googlesource.com/new-password Generate password
66. repo upload
67. Summary
68. Thank you