Android--build.prop parsing "Go"

This article was reproduced from: http://blog.csdn.net/lengyue1084/article/details/77637354

I. Concept

In the Android device Shell Terminal can see the/system directory of Build.prop files, Android Build.prop files are collected at the time of Android compile various property (LCD density/language/compile time , etc.), the file is generated in the out/target/product/<board>/system/directory after the compilation is complete. These attribute values can be read from the Property_get () [C + + domain]/systemproperties_get* () [Java domain] at the time of Android runtime, referring to the android--systemproperties application

Two. Build

The Build.prop generation is done by the make system parsing build/core/makefile:

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2. Buildinfo_sh : = build/tools/buildinfo.sh
4. $ (Installed_build_prop_target): $ (buildinfo_sh) $ (internal_build_id_makefile) $ (build_system)/version_defaults.mk $ (wildcard $ (target_device_dir)/system.prop)
6. @echo Target buildinfo: [Email protected]
8. @mkdir-P $ (dir [email protected])
10. $ (hide) target_build_type="$ (target_build_variant)" \
12. target_device="$ (target_device)" \
14. product_name="$ (target_product)" \
16. product_brand="$ (product_brand)" \
18. product_default_language="$ (call default-locale-language,$ (product_locales))" \
20. product_default_region="$ (call default-locale-region,$ (product_locales))" \
22. product_default_wifi_channels="$ (product_default_wifi_channels)" \
24. product_model="$ (product_model)" \
26. product_manufacturer="$ (product_manufacturer)" \
28. private_build_desc="$ (private_build_desc)" \
30. build_id="$ (build_id)" \
32. build_display_id="$ (build_display_id)" \
34. build_number="$ (build_number)" \
36. platform_version="$ (platform_version)" \
38. platform_sdk_version="$ (platform_sdk_version)" \
40. platform_version_codename="$ (platform_version_codename)" \
42. build_version_tags="$ (build_version_tags)" \
44. target_bootloader_board_name="$ (target_bootloader_board_name)" \
46. build_fingerprint="$ (build_fingerprint)" \
48. target_board_platform="$ (target_board_platform)" \
50. target_cpu_abi="$ (target_cpu_abi)" \
52. target_cpu_abi2="$ (TARGET_CPU_ABI2)" \
54. target_aapt_characteristics="$ (target_aapt_characteristics)" \
56. bash $ (buildinfo_sh) > [email protected]
58. $ (hide) if [-F $ (target_device_dir)/system.prop]; Then \
60. Cat $ (target_device_dir)/system.prop >> [email protected];
62. Fi
64. $ (if $ (additional_build_properties), \
66. $ (hide) echo >> [email protected]; \
68. echo "#" >> [email protected]; \
70. echo "# additional_build_properties" >> [email protected]; \
72. echo "#" >> [email protected];)
74. $ (hide) $ (foreach line,$ (additional_build_properties), \
76. echo "$ (line)" >> [email protected];)
78. $ (hide) build/tools/post_process_props.py [email protected]
82. Build_desc : =

1. The target installed_build_prop_target is

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1. Installed_build_prop_target : = $ (target_out)/build.prop

You can see that the values that define some variables, such as Product_default_language, are used in later scripts. Then call build/tools/buildinfo.sh this script

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1. bash $ (buildinfo_sh) > [email protected]

Output the variable to Build.prop:

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2. echo "# Begin Build Properties"
4. echo "# Autogenerated by buildinfo.sh"
8. echo "ro.build.id= $BUILD _id"
10. echo "ro.build.display.id= $BUILD _display_id"
12. echo "ro.build.version.incremental= $BUILD _number"
14. echo "ro.build.version.sdk= $PLATFORM _sdk_version"
16. echo "ro.build.version.codename= $PLATFORM _version_codename"
18. echo "ro.build.version.release= $PLATFORM _version"
20. echo "ro.build.date= ' Date '"
22. echo "ro.build.date.utc= ' date +%s '"
24. echo "ro.build.type= $TARGET _build_type"
26. echo "ro.build.user= $USER"
28. echo "ro.build.host= ' hostname '"
30. echo "ro.build.tags= $BUILD _version_tags"
32. echo "ro.product.model= $PRODUCT _model"
34. echo "ro.product.brand= $PRODUCT _brand"
36. echo "ro.product.name= $PRODUCT _name"
38. echo "ro.product.device= $TARGET _device"
40. echo "ro.product.board= $TARGET _bootloader_board_name"
42. echo "ro.product.cpu.abi= $TARGET _cpu_abi"
44. If [-N "$TARGET _cpu_abi2"]; Then
46. echo "ro.product.cpu.abi2= $TARGET _cpu_abi2"
48. Fi
50. echo "ro.product.manufacturer= $PRODUCT _manufacturer"
52. If [-N "$PRODUCT _default_language"]; Then
54. echo "ro.product.locale.language= $PRODUCT _default_language"
56. Fi
58. If [-N "$PRODUCT _default_region"]; Then
60. echo "ro.product.locale.region= $PRODUCT _default_region"
62. Fi
64. echo "ro.wifi.channels= $PRODUCT _default_wifi_channels"
66. echo "ro.board.platform= $TARGET _board_platform"
70. echo "# ro.build.product is obsolete; Use Ro.product.device "
72. echo "ro.build.product= $TARGET _device"
76. echo "# Do not try to parse ro.build.description or. Fingerprint"
78. echo "ro.build.description= $PRIVATE _build_desc"
80. echo "ro.build.fingerprint= $BUILD _fingerprint"
82. echo "ro.build.characteristics= $TARGET _aapt_characteristics"
86. echo "# End Build Properties"

After the buildinfo.sh script is finished, the contents of $ (target_device_dir)/system.prop and

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1. # ADD The product-defined properties to the build properties.
2. Additional_build_properties : = \
3. $ (additional_build_properties) \
4. $ (product_property_overrides)

The properties of the additional_build_properties are appended to Build.prop.

At this point, the build Build.prop is complete!

Three. Properties

# Begin build Properties (start building system attributes)

# Autogenerated by buildinfo.sh (currently this section is automatically generated by Build.info)

RO.BUILD.ID=IML74K (Version ID)

ro.build.display.id=t40-mg-s2-v1.0 (version number)

ro.build.version.incremental=eng.root.20130428.234356 (version increment)

Ro.build.version.sdk=15 (SDK Version)

Ro.build.version.codename=rel (Version code)

ro.build.version.release=4.0.3 (Android version)

ro.build.date=2013 April 28 Sunday 23:46:27 CST (compile time)

ro.build.date.utc=1367163987 (UTC representation of compile time)

Ro.build.type=eng (Compilation type: Eng/user)

Ro.build.user=root (compiler)

Ro.build.host=alex-natty-dell (compile host name)

Ro.build.tags=debug,test-keys

RO.PRODUCT.MODEL=S2 (mobile phone model)--

Ro.product.brand=spreadtrum (mobile brand)

Ro.product.name=sp6825eb_7661plus (official name of mobile phone)

ro.product.device=sp6825eb_7661 (equipment used)

ro.product.board=sp6825eb_7661 (motherboard used)

RO.PRODUCT.CPU.ABI=ARMEABI-V7A (version of CPU)

Ro.product.cpu.abi2=armeabi (CPU Brand)

Ro.product.manufacturer=spreadtrum (handset manufacturer)

ro.wifi.channels= (WiFi connection channel)

ro.board.platform=sc8825 (Motherboard platform)

ro.sf.lcd_density=240 (display density)

ro.sf.hwrotation = 180 (upper data rotation 180 degrees)

Ro.gpu=mali (Image processor with Mali)

ro.opengles.version=131072 (OpenGL for Embedded Systems)

Ro.device.support.mmc=1

Hwui.render_dirty_regions=false

ro.hwui.text_cache_width=2048

Persist.ttydev=ttyvuart0

Ro.device.support.vt=0 (Videophone support)

Ro.device.support.gps=0 (GPS supported)

Keyguard.no_require_sim=true (Mobile card protection settings. True: No SIM card is required to operate the phone)

Ro.com.android.dataroaming=false (Roaming settings)

persist.msms.phone_count=2 (Dual sim)

Persist.blcr.enable=0

Persist.msms.phone_default=0 (Dual sim default first card)

dalvik.vm.heapsize=128m (Virtual memory size: 16m/24m/32m/48m, etc.)

RO.COM.ANDROID.DATEFORMAT=MM-DD-YYYY (Default time format: YYYY-MM-DD, etc.)

Ro.config.ringtone=beatplucker.ogg (default ringtone settings, file in/system/media/audio/ringtones put the favorite ringtone here, such as 123. MP3 into the ringtones folder, where the code is changed to Ro.config.ringtone=123.mp3)

Ro.config.notification_sound=pixiedust.ogg (default beep:/system/media/audio/notifications)

Ro.config.alarm_alert=alarm_classic.ogg (Default alarm tone:/system/media/audio/alarms)

Ro.product.locale.language=zh (phone default language, e.g. En/zh)

RO.PRODUCT.LOCALE.REGION=CN (regional languages, such as: US/CN)

(Product specific MK file (e.g. Prod_sp6825_7661base.mk) scope since this end)

Ro.kernel.android.checkjni=1

Ro.setupwizard.mode=optional (Setup Wizard mode)

Net.bt.name=android

Dalvik.vm.stack-trace-file=/data/anr/traces.txt (This parameter controls the stack record debug file for the Dalvik virtual machine.) For system debugging, the general user does not make sense to its adjustment)

Ro.logappslow=0

Ro.build.product.lowmem=0

Ro.floatkey.show=false (true: support small green dot function, click the small green point on the interface can jump out of the Menu/home/back three virtual keys)

Persist.sys.kb.auto=1

Device.support.face.smile=1 (whether to support smiley-face photography and facial recognition)

Device.support.pano=1 (whether the camera supports panoramic photography)

Android--build.prop parsing "Go"