• build.prop 文件与 getprop 命令

    注意两者的关系
    服务器君一共花费 25.850 ms 进行了 3 次数据库查询,努力地为您提供了这个页面。
    广告很萌的

    在android系统中,它的根文件系统下有几个用于启动系统时需要的配置文件:

    • /init.rc
    • /default.prop
    • /system/build.prop

    我们先看看 build.prop 里面到底有些什么东西:

    E:\AndroidProject\NowaMagic>adb shell
    shell@android:/ $ su
    su
    root@android:/ # cd system
    cd system
    root@android:/system # cat build.prop
    cat build.prop
    # begin build properties
    # autogenerated by buildinfo.sh
    ro.build.id=JRO03L
    ro.build.display.id=JRO03L
    ro.build.version.incremental=JLB21.0
    ro.build.version.sdk=16
    ro.build.version.codename=REL
    ro.build.version.release=4.1.1
    ro.build.date=Thu Aug  1 17:50:59 CST 2013
    ro.build.date.utc=1375350659
    ro.build.type=user
    ro.build.user=builder
    ro.build.host=taishan
    ro.build.tags=release-keys
    ro.product.model=MI 2
    ro.product.brand=Xiaomi
    ro.product.name=aries
    ro.product.device=aries
    ro.product.board=MSM8960
    ro.product.cpu.abi=armeabi-v7a
    ro.product.cpu.abi2=armeabi
    ro.product.manufacturer=Xiaomi
    ro.product.locale.language=zh
    ro.product.locale.region=CN
    ro.wifi.channels=
    ro.board.platform=msm8960
    # ro.build.product is obsolete; use ro.product.device
    ro.build.product=aries
    # Do not try to parse ro.build.description or .fingerprint
    ro.build.description=aries-user 4.1.1 JRO03L JLB21.0 release-keys
    ro.build.fingerprint=Xiaomi/aries/aries:4.1.1/JRO03L/JLB21.0:user/release-keys
    ro.build.characteristics=nosdcard
    # end build properties
    #
    # system.prop for surf
    #
    
    rild.libpath=/system/lib/libril-qc-qmi-1.so
    rild.libargs=-d /dev/smd0
    persist.rild.nitz_plmn=
    persist.rild.nitz_long_ons_0=
    persist.rild.nitz_long_ons_1=
    persist.rild.nitz_long_ons_2=
    persist.rild.nitz_long_ons_3=
    persist.rild.nitz_short_ons_0=
    persist.rild.nitz_short_ons_1=
    persist.rild.nitz_short_ons_2=
    persist.rild.nitz_short_ons_3=
    ril.subscription.types=RUIM
    DEVICE_PROVISIONED=1
    debug.sf.hw=1
    debug.egl.hw=1
    debug.composition.type=dyn
    debug.mdpcomp.maxlayer=3
    debug.mdpcomp.logs=0
    
    ro.sf.lcd_density=320
    
    # save modem ramdump to sdcard
    persist.radio.parsedump=1
    persist.radio.ramdump_sdcard=0
    persist.radio.ramdump_num=3
    
    #
    # system props for the cne module
    #
    #persist.cne.bat.range.low.med=30
    #persist.cne.bat.range.med.high=60
    #persist.cne.loc.policy.op=/system/etc/OperatorPolicy.xml
    #persist.cne.loc.policy.user=/system/etc/UserPolicy.xml
    #persist.cne.bwbased.rat.sel=false
    #persist.cne.snsr.based.rat.mgt=false
    #persist.cne.bat.based.rat.mgt=false
    #persist.cne.rat.acq.time.out=30000
    #persist.cne.rat.acq.retry.tout=0
    #persist.cne.feature=1
    
    ro.hdmi.enable=true
    lpa.decode=false
    lpa.use-stagefright=true
    
    #system props for the MM modules
    
    media.stagefright.enable-player=true
    media.stagefright.enable-http=true
    media.stagefright.enable-aac=true
    media.stagefright.enable-qcp=true
    media.stagefright.enable-fma2dp=true
    media.stagefright.enable-scan=true
    mmp.enable.3g2=true
    
    #
    # system props for the data modules
    #
    ro.use_data_netmgrd=true
    
    #system props for time-services
    #persist.timed.enable=true
    
    # System props for audio
    persist.audio.fluence.mode=endfire
    persist.audio.vr.enable=false
    persist.audio.handset.mic=digital
    
    # System prop to select audio resampler quality
    af.resampler.quality=255
    # System prop to select MPQAudioPlayer by default on mpq8064
    mpq.audio.decode=true
    
    #
    # system prop for opengles version
    #
    # 131072 is decimal for 0x20000 to report version 2
    ro.opengles.version=131072
    
    #
    # system property for Bluetooth Handsfree Profile version
    #
    ro.bluetooth.hfp.ver=1.6
    #
    #system prop for Bluetooth hci transport
    ro.qualcomm.bt.hci_transport=smd
    #
    # system prop for requesting Master role in incoming Bluetooth connection.
    #
    ro.bluetooth.request.master=true
    #
    # system prop for Bluetooth Auto connect for remote initated connections
    #
    ro.bluetooth.remote.autoconnect=true
    # system property for Bluetooth discoverability time out in seconds
    # 0: Always discoverable
    #debug.bt.discoverable_time=0
    
    #system prop for switching gps driver to qmi
    persist.gps.qmienabled=true
    
    # System property for cabl
    ro.qualcomm.cabl=0
    
    # System property for csc
    debug.csc.poll=0
    
    # System props for telephony
    # System prop to turn on CdmaLTEPhone always
    # telephony.lteOnCdmaDevice=1
    
    #
    # System prop for sending transmit power request to RIL during WiFi hotspot on/off
    #
    ro.ril.transmitpower=true
    
    #
    #Simulate sdcard on /data/media
    #
    persist.fuse_sdcard=true
    ro.hwui.text_cache_width=2048
    ro.hwui.texture_cache_size=48
    
    #
    # Supports warmboot capabilities
    #
    ro.warmboot.capability=1
    
    #snapdragon value add features
    ro.qcom.audio.ssr=true
    
    persist.sys.strictmode.disable=true
    power.webview.DM=false
    
    #enable cdrom installer
    persist.service.cdrom.enable=1
    
    #
    # Haptic
    #
    ro.haptic.vibrate_ex.enabled=1
    sys.haptic.long.weak=0,127,10,50,20,-50,10,0,10
    sys.haptic.long.normal=0,127,10,80,20,-80,10,0,10
    sys.haptic.long.strong=0,127,10,100,20,-100,10,0,10
    sys.haptic.down.weak=0,120,10,-50,10,0,10
    sys.haptic.down.normal=0,127,10,-80,10,0,10
    sys.haptic.down.strong=0,127,20,-80,10,0,10
    sys.haptic.up.weak=0,80,30,-50,10,0,10
    sys.haptic.up.normal=0,100,30,-100,10,0,10
    sys.haptic.up.strong=0,120,30,-120,10,0,10
    sys.haptic.tap.weak=0,80,40,-5,5,0,10
    sys.haptic.tap.normal=0,100,40,-5,5,0,10
    sys.haptic.tap.strong=0,120,40,-5,5,0,10
    
    # power mode
    persist.sys.aries.power_profile=middle
    
    # button jack mode and switch
    persist.sys.button_jack_profile=volume
    persist.sys.button_jack_switch=0
    
    # suspend mode capability
    ro.warmboot.capability=true
    
    # display preference
    persist.sys.display_prefer=0
    persist.sys.display_ce=0
    debug.enabletr=false
    
    #
    # ADDITIONAL_BUILD_PROPERTIES
    #
    ro.miui.ui.version.code=3
    ro.miui.ui.version.name=V5
    keyguard.no_require_sim=true
    ro.com.android.dataroaming=false
    ro.com.android.dateformat=MM-dd-yyyy
    ro.config.ringtone=MI.ogg
    ro.config.notification_sound=FadeIn.ogg
    ro.config.alarm_alert=GoodMorning.ogg
    ro.config.sms_received_sound=FadeIn.ogg
    ro.config.sms_delivered_sound=MessageComplete.ogg
    ro.carrier=unknown
    persist.sys.mitalk.enable=true
    ro.vendor.extension_library=/system/lib/libqc-opt.so
    ro.com.google.clientidbase=android-xiaomi
    dalvik.vm.heapstartsize=8m
    dalvik.vm.heapgrowthlimit=96m
    dalvik.vm.heapsize=384m
    dalvik.vm.heaputilization=0.25
    dalvik.vm.heapidealfree=8388608
    dalvik.vm.heapconcurrentstart=2097152
    ro.setupwizard.mode=OPTIONAL
    ro.com.google.gmsversion=4.1_r5
    net.bt.name=Android
    dalvik.vm.stack-trace-file=/data/anr/traces.txt
    

    该文件存放的数据是以这种等号形式存放的,而且它们是键值对成对出现的。

    留意最后几行,我们试下用 getprop 命令:

    root@android:/ # getprop net.bt.name
    getprop net.bt.name
    Android
    root@android:/ # getprop dalvik.vm.stack-trace-file
    getprop dalvik.vm.stack-trace-file
    /data/anr/traces.txt
    root@android:/ #
    

    很明显,getprop 就是将配置文件 build.prop 里的信息读取出来并经过整理后,并以字典的形式展示给用户的。

    它的格式如下:

    • getprop  列出所有配置属性值
    • getprop [key]  取得对应的key的属性值

    如果要修改属性的话,很简单,只需修改字典值就可以了,如:

    setprop [key] [value] 设置指定key的属性值。

    而 watchprops 监听系统属性的变化,如果期间系统的属性发生变化则把变化的值显示出来。

    其实这三个命令都是toolbox的子命令,如果有兴趣的可以看在android源码中看到其对应的源码:system/core/toolbox/

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Welcome to NowaMagic Academy!

现代魔法 推荐于 2013-02-27 10:23   

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