Android——build.prop 解析

  

一.概念

           在Android设备shell终端可以看到/system目录下的build.prop文件,Android的build.prop文件是在Android编译时刻收集的各种property(LCD density/语言/编译时间, etc.),编译完成之后,文件生成在out/target/product/<board>/system/目录下。在Android运行时刻可以通过property_get()[c/c++域] / SystemProperties_get*()[Java域]读取这些属性值,参考Android——SystemProperties的应用

 二.生成

build.prop的生成是由make系统解析build/core/Makefile完成 :


BUILDINFO_SH := build/tools/buildinfo.sh
$(INSTALLED_BUILD_PROP_TARGET): $(BUILDINFO_SH) $(INTERNAL_BUILD_ID_MAKEFILE) $(BUILD_SYSTEM)/version_defaults.mk $(wildcard $(TARGET_DEVICE_DIR)/system.prop)
	@echo Target buildinfo: $@
	@mkdir -p $(dir $@)
	$(hide) TARGET_BUILD_TYPE="$(TARGET_BUILD_VARIANT)" \
			TARGET_DEVICE="$(TARGET_DEVICE)" \
			PRODUCT_NAME="$(TARGET_PRODUCT)" \
			PRODUCT_BRAND="$(PRODUCT_BRAND)" \
			PRODUCT_DEFAULT_LANGUAGE="$(call default-locale-language,$(PRODUCT_LOCALES))" \
			PRODUCT_DEFAULT_REGION="$(call default-locale-region,$(PRODUCT_LOCALES))" \
			PRODUCT_DEFAULT_WIFI_CHANNELS="$(PRODUCT_DEFAULT_WIFI_CHANNELS)" \
			PRODUCT_MODEL="$(PRODUCT_MODEL)" \
			PRODUCT_MANUFACTURER="$(PRODUCT_MANUFACTURER)" \
			PRIVATE_BUILD_DESC="$(PRIVATE_BUILD_DESC)" \
			BUILD_ID="$(BUILD_ID)" \
			BUILD_DISPLAY_ID="$(BUILD_DISPLAY_ID)" \
			BUILD_NUMBER="$(BUILD_NUMBER)" \
			PLATFORM_VERSION="$(PLATFORM_VERSION)" \
			PLATFORM_SDK_VERSION="$(PLATFORM_SDK_VERSION)" \
			PLATFORM_VERSION_CODENAME="$(PLATFORM_VERSION_CODENAME)" \
			BUILD_VERSION_TAGS="$(BUILD_VERSION_TAGS)" \
			TARGET_BOOTLOADER_BOARD_NAME="$(TARGET_BOOTLOADER_BOARD_NAME)" \
			BUILD_FINGERPRINT="$(BUILD_FINGERPRINT)" \
			TARGET_BOARD_PLATFORM="$(TARGET_BOARD_PLATFORM)" \
			TARGET_CPU_ABI="$(TARGET_CPU_ABI)" \
			TARGET_CPU_ABI2="$(TARGET_CPU_ABI2)" \
			TARGET_AAPT_CHARACTERISTICS="$(TARGET_AAPT_CHARACTERISTICS)" \
	        bash $(BUILDINFO_SH) > $@
	$(hide) if [ -f $(TARGET_DEVICE_DIR)/system.prop ]; then \
	          cat $(TARGET_DEVICE_DIR)/system.prop >> $@; \
	        fi
	$(if $(ADDITIONAL_BUILD_PROPERTIES), \
		$(hide) echo >> $@; \
		        echo "#" >> $@; \
		        echo "# ADDITIONAL_BUILD_PROPERTIES" >> $@; \
		        echo "#" >> $@; )
	$(hide) $(foreach line,$(ADDITIONAL_BUILD_PROPERTIES), \
		echo "$(line)" >> $@;)
	$(hide) build/tools/post_process_props.py $@

build_desc :=

1.目标INSTALLED_BUILD_PROP_TARGET就是

INSTALLED_BUILD_PROP_TARGET := $(TARGET_OUT)/build.prop


可以看到定义一些变量的值比如PRODUCT_DEFAULT_LANGUAGE,会在后面脚本中用到。然后调用build/tools/buildinfo.sh这个脚本

bash $(BUILDINFO_SH) > $@
将变量输出到build.prop当中:

echo "# begin build properties"
echo "# autogenerated by buildinfo.sh"

echo "ro.build.id=$BUILD_ID"
echo "ro.build.display.id=$BUILD_DISPLAY_ID"
echo "ro.build.version.incremental=$BUILD_NUMBER"
echo "ro.build.version.sdk=$PLATFORM_SDK_VERSION"
echo "ro.build.version.codename=$PLATFORM_VERSION_CODENAME"
echo "ro.build.version.release=$PLATFORM_VERSION"
echo "ro.build.date=`date`"
echo "ro.build.date.utc=`date +%s`"
echo "ro.build.type=$TARGET_BUILD_TYPE"
echo "ro.build.user=$USER"
echo "ro.build.host=`hostname`"
echo "ro.build.tags=$BUILD_VERSION_TAGS"
echo "ro.product.model=$PRODUCT_MODEL"
echo "ro.product.brand=$PRODUCT_BRAND"
echo "ro.product.name=$PRODUCT_NAME"
echo "ro.product.device=$TARGET_DEVICE"
echo "ro.product.board=$TARGET_BOOTLOADER_BOARD_NAME"
echo "ro.product.cpu.abi=$TARGET_CPU_ABI"
if [ -n "$TARGET_CPU_ABI2" ] ; then
  echo "ro.product.cpu.abi2=$TARGET_CPU_ABI2"
fi
echo "ro.product.manufacturer=$PRODUCT_MANUFACTURER"
if [ -n "$PRODUCT_DEFAULT_LANGUAGE" ] ; then
  echo "ro.product.locale.language=$PRODUCT_DEFAULT_LANGUAGE"
fi
if [ -n "$PRODUCT_DEFAULT_REGION" ] ; then
  echo "ro.product.locale.region=$PRODUCT_DEFAULT_REGION"
fi
echo "ro.wifi.channels=$PRODUCT_DEFAULT_WIFI_CHANNELS"
echo "ro.board.platform=$TARGET_BOARD_PLATFORM"

echo "# ro.build.product is obsolete; use ro.product.device"
echo "ro.build.product=$TARGET_DEVICE"

echo "# Do not try to parse ro.build.description or .fingerprint"
echo "ro.build.description=$PRIVATE_BUILD_DESC"
echo "ro.build.fingerprint=$BUILD_FINGERPRINT"
echo "ro.build.characteristics=$TARGET_AAPT_CHARACTERISTICS"

echo "# end build properties"

buildinfo.sh脚本完了之后,会把$(TARGET_DEVICE_DIR)/system.prop的内容和

# Add the product-defined properties to the build properties.
ADDITIONAL_BUILD_PROPERTIES := \
    $(ADDITIONAL_BUILD_PROPERTIES) \
    $(PRODUCT_PROPERTY_OVERRIDES)

ADDITIONAL_BUILD_PROPERTIES的属性 追加到build.prop。

至此,生成build.prop完毕!


三.属性

# begin build properties(开始建立系统属性)

# autogenerated by buildinfo.sh(目前这部分由build.info自动生成)

ro.build.id=IML74K(版本id)

ro.build.display.id=T40-MG-S2-V1.0(版本号)

ro.build.version.incremental=eng.root.20130428.234356(版本增量)

ro.build.version.sdk=15(sdk版本)

ro.build.version.codename=REL(版本代号)

ro.build.version.release=4.0.3(android版本)

ro.build.date=2013年04月28日星期日23:46:27 CST(编译时间)

ro.build.date.utc=1367163987(编译时间的utc表示)

ro.build.type=eng(编译类型:eng/user)

ro.build.user=root(编译者)

ro.build.host=Alex-Natty-Dell(编译主机名)

ro.build.tags=debug,test-keys

ro.product.model=S2(手机型号)--

ro.product.brand=Spreadtrum(手机品牌)

ro.product.name=sp6825eb_7661plus(手机正式名称)

ro.product.device=sp6825eb_7661(采用的设备)

ro.product.board=sp6825eb_7661(采用的主板)

ro.product.cpu.abi=armeabi-v7a(cpu的版本)

ro.product.cpu.abi2=armeabi(CPU品牌)

ro.product.manufacturer=Spreadtrum(手机制造商)

ro.wifi.channels=(WIFI连接的渠道)

ro.board.platform=sc8825(主板平台)

ro.sf.lcd_density=240(显示密度)

ro.sf.hwrotation = 180(上层数据旋转180度)

ro.gpu=mali(图像处理器采用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(是否支持可视电话)

ro.device.support.gps=0(是否支持gps)

keyguard.no_require_sim=true (手机卡保护设置.true:无需SIM卡也可操作手机)

ro.com.android.dataroaming=false (漫游设置)

persist.msms.phone_count=2(双卡)

persist.blcr.enable=0

persist.msms.phone_default=0(双卡默认第一张卡)

dalvik.vm.heapsize=128m(虚拟内存大小:16m/24m/32m/48m等)

ro.com.android.dateformat=MM-dd-yyyy(默认时间格式:yyyy-MM-dd等)

ro.config.ringtone=BeatPlucker.ogg(默认铃声设置,文件在/system/media/audio/ringtones 把喜欢的铃声放这里,比如123.MP3放入ringtones文件夹中,这里代码改为ro.config.ringtone=123.mp3)

ro.config.notification_sound=pixiedust.ogg(默认提示音:/system/media/audio/notifications)

ro.config.alarm_alert=Alarm_Classic.ogg(默认闹铃音:/system/media/audio/alarms)

ro.product.locale.language=zh(手机默认语言,如:en/zh)

ro.product.locale.region=CN(地区语言,如:US/CN)

(产品具体mk文件(如prod_sp6825_7661base.mk)作用域自此结束)

ro.kernel.android.checkjni=1

ro.setupwizard.mode=OPTIONAL(安装向导模式)

net.bt.name=Android

dalvik.vm.stack-trace-file=/data/anr/traces.txt(本参数控制Dalvik虚拟机的堆栈记录调试文件。用于系统调试,一般用户对其调整无意义)

ro.logappslow=0

ro.build.product.lowmem=0

ro.floatkey.show=false(true:支持小绿点功能,点击界面上的小绿点可以跳出menu/home/back三个虚拟键)

persist.sys.kb.auto=1

device.support.face.smile=1(是否支持笑脸拍照和人脸识别)

device.support.pano=1(相机是否支持全景拍照)



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