接前一篇文章使用Android Studio查看Android Lollipop源码, 我们知道,仅仅看代码,提高是比较有限的,而且理解起来也比较肤浅,往往过目就忘. 而自己写过的代码,往往会印象比较深刻,在写的时候也会比较容易理解流程. 所以我们在看代码的同时, 如果能修改代码, 在手机上跑起来并看到修改的效果,这无疑会加快看代码的效率和积极性. 所以这篇文章,就讲解一下如何自己编译AndroidL的源码,并且在Nexus5上跑起来. 至于为何需要自己编译固件,而不是直接安装Google给出的工厂固件?原因是Google给出的工厂固件是User版本,是没法随心所欲Push东西进去的. 所以我们需要编译自己的Userdebug版本.

本文假设你已经下载了AndroidL的源码,并且有一台Nexus5手机(手机系统开发人员必备), 如果你还没有AndroidL的源码,或者你有源码但是没有配置编译的环境,那么 Initializing a Build EnvironmentDownloading the Source这两篇文章你应该先去看一下(我又一次假设你会翻墙,如果你不会翻墙,那么下代码也是一个痛苦的事情). 这后面的教程Google官网也有教程.所以我只针对Nexus5进行讲解.

另外你需要知道AOSP,AOSP即Android Open Source Project 汉语意思是:谷歌开放源代码项目.我们通过Google官方下载的源代码,就是AOSP的代码, 其中是不包含Google开发的那些个应用的,各个厂商拿到的也是这个版本,在这个版本的基础上进行修改. 而Google发布的工厂固件则是包含全套Google服务的. 厂商如果想安装Google服务,就需要过Google的那一套认证,比较麻烦,而且价格不菲,鉴于Google在国内的尴尬地位,国内很多厂商都没有过这个认证.

1. 初始化编译环境

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. build/envsetup.sh

2. 加载机型

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lunch

3. 选择要编译的机器

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You're building on Linux
Lunch menu... pick a combo:
1. aosp_arm-eng
2. aosp_arm64-eng
3. aosp_mips-eng
4. aosp_mips64-eng
5. aosp_x86-eng
6. aosp_x86_64-eng
7. aosp_shamu-userdebug
8. aosp_manta-userdebug
9. full_fugu-userdebug
10. aosp_fugu-userdebug
11. aosp_grouper-userdebug
12. aosp_tilapia-userdebug
13. aosp_deb-userdebug
14. aosp_flo-userdebug
15. aosp_mako-userdebug
16. aosp_hammerhead-userdebug
17. aosp_flounder-userdebug
18. mini_emulator_x86_64-userdebug
19. mini_emulator_arm-userdebug
20. mini_emulator_x86-userdebug
21. mini_emulator_mips-userdebug
22. mini_emulator_arm64-userdebug

3.1 机型对照表

DEVICE CODE NAME BUILD CONFIGURATION
Nexus 6 shamu aosp_shamu-userdebug
Nexus Player fugu aosp_fugu-userdebug
Nexus 9 volantis (flounder) aosp_flounder-userdebug
Nexus 5 (GSM/LTE) hammerhead aosp_hammerhead-userdebug
Nexus 7 (Wi-Fi) razor (flo) aosp_flo-userdebug
Nexus 7 (Mobile) razorg (deb) aosp_deb-userdebug
Nexus 10 mantaray (manta) full_manta-userdebug
Nexus 4 occam (mako) full_mako-userdebug
Nexus 7 (Wi-Fi) nakasi (grouper) full_grouper-userdebug
Nexus 7 (Mobile) nakasig (tilapia) full_tilapia-userdebug
Galaxy Nexus (GSM/HSPA+) yakju (maguro) full_maguro-userdebug
Galaxy Nexus (Verizon) mysid (toro) aosp_toro-userdebug
Galaxy Nexus (Experimental) mysidspr (toroplus) aosp_toroplus-userdebug
PandaBoard (Archived) panda aosp_panda-userdebug
Motorola Xoom (U.S. Wi-Fi) wingray full_wingray-userdebug
Nexus S soju (crespo) full_crespo-userdebug
Nexus S 4G sojus (crespo4g) full_crespo4g-userdebug3.2

3.2 三个版本说明版本

BUILDTYPE USE
user limited access; suited for production
userdebug like “user” but with root access and debuggability; preferred for debugging
eng development configuration with additional debugging tools

选择aosp_hammerhead-userdebug之后,会有下面的确认信息:

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============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=5.0.50.50.50.50
TARGET_PRODUCT=aosp_hammerhead
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=krait
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.13.0-37-generic-x86_64-with-Ubuntu-14.10-utopic
HOST_BUILD_TYPE=release
BUILD_ID=AOSP
OUT_DIR=out
============================================

4. 生成驱动目录

接下来需要在Android官网下载 Nexus5所需要的驱动:

HARDWARE COMPONENT COMPANY DOWNLOAD MD5 CHECKSUM SHA-1 CHECKSUM
NFC, Bluetooth, Wi-Fi Broadcom Link 2c398994e37093df51b105d63f0eb611 991346159c95ae75f760014a6822b8b3e8667700
Camera, Sensors, Audio LG Link 74cf8235e6bb04da28b2ff738b13eee9 175dd5bae81bb54030d072cb0f0b4ec81eb3f71f
Graphics, GSM, Camera, GPS, Sensors, Media, DSP, USB Qualcomm Link 0a43395e175d3de3dc312d8abdcb4f20 007cf9d49f0409d5c703e7f2811fd153fee22353

下载完成后,解压出来是三个.sh文件,放到Android源码目录下面,然后执行.会将相关驱动放到vender目录下面.

5. 执行编译命令

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make -j8

如果没有出错的话,在经过漫长的时间之后,编译成功:

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Installed file list: out/target/product/hammerhead/installed-files.txt
Target system fs image: out/target/product/hammerhead/obj/PACKAGING/systemimage_intermediates/system.img
Running: mkuserimg.sh -s out/target/product/hammerhead/system out/target/product/hammerhead/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 1073741824 -L system out/target/product/hammerhead/root/file_contexts
make_ext4fs -s -T -1 -S out/target/product/hammerhead/root/file_contexts -L system -l 1073741824 -a system out/target/product/hammerhead/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/hammerhead/system
Creating filesystem with parameters:
Size: 1073741824
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 4096
Label: system
Blocks: 262144
Block groups: 8
Reserved block group size: 63
Created filesystem with 1445/65536 inodes and 85879/262144 blocks
Install system fs image: out/target/product/hammerhead/system.img
out/target/product/hammerhead/system.img+out/target/product/hammerhead/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=1096212480 blocksize=135168 total=336629666 reserve=11083776

6. 刷机命令

Nexus5关机状态下,长按音量下+电源,即可进入recovery模式, 然后在源码根目录下执行下面命令:

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fastboot -w flashall

刷机成功后会自动重启

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~/Android-SourceCode fastboot -w flashall
target reported max download size of 1073741824 bytes
Creating filesystem with parameters:
Size: 13725835264
Block size: 4096
Blocks per group: 32768
Inodes per group: 8144
Inode size: 256
Journal blocks: 32768
Label:
Blocks: 3351034
Block groups: 103
Reserved block group size: 823
Created filesystem with 11/838832 inodes and 93654/3351034 blocks
Creating filesystem with parameters:
Size: 734003200
Block size: 4096
Blocks per group: 32768
Inodes per group: 7472
Inode size: 256
Journal blocks: 2800
Label:
Blocks: 179200
Block groups: 6
Reserved block group size: 47
Created filesystem with 11/44832 inodes and 5813/179200 blocks
--------------------------------------------
Bootloader Version...: HHZ12d
Baseband Version.....: M8974A-2.0.50.2.22
Serial Number........: 08ade1a513dc087b
--------------------------------------------
checking product...
OKAY [ 0.100s]
sending 'boot' (8950 KB)...
OKAY [ 0.500s]
writing 'boot'...
OKAY [ 0.784s]
sending 'recovery' (9672 KB)...
OKAY [ 0.556s]
writing 'recovery'...
OKAY [ 0.814s]
erasing 'system'...
OKAY [ 1.166s]
sending 'system' (328187 KB)...
OKAY [ 10.501s]
writing 'system'...
OKAY [ 23.623s]
erasing 'userdata'...
OKAY [ 14.657s]
sending 'userdata' (137318 KB)...
OKAY [ 4.520s]
writing 'userdata'...
OKAY [ 9.776s]
erasing 'cache'...
OKAY [ 0.618s]
sending 'cache' (13348 KB)...
OKAY [ 0.630s]
writing 'cache'...
OKAY [ 1.070s]
rebooting...
finished. total time: 70.095s

7.秀桌面

image