Android 读取系统属性详解

一，背景介绍

        Android 系统属性主要有两种：SettingsProvider 和 SystemProperties 。

二，SettingsProvider详解

2.1 关于Android"设置"里的一些属性可以直接通过settings命令直接查看或者设置adb shell 下 settings指令可以分别查看系统、全局、安全设置属性。

2.1.1 settings查看方法

adb shell settings list system
adb shell settings list global
adb shell settings list secure

2.1.2 属性的存储位置

/data/system/users/0/下的对应xml文件：
settings_global.xml
settings_secure.xml
settings_system.xml

2.1.3 settings方法

# get方法
adb shell settings get global bluetooth_on
# set方法
adb shell settings put global bluetooth_on 1

C:\Users\Administrator>adb shell
abc‏‎‎‏‎:/ $ su
abc‏‎‎‏‎:/ # settings list global | grep device
device_name=‎‏‎‎‎‎‎‏‎‏‏‏‎‎‎‎‎‏‎‎‏‎‎‎‏‎‏‏‏‏‏‏‏‏‏‏‏‎‏‎‏‏‎‏‏‎‎‏‎‏‎‏‎‏‎‎‎‏‎‎‏‎‎‎‏‎‎‏‏‏‎‏‎‏‎‎‏‎‏‎‏‎‏‏‏‏‏‏‎‏‏‏‏‎‏‎Android abc‏‎‎‏‎
device_provisioned=1
abc‏‎‎‏‎:/ #

2.1.4 源码相关

状态值进行存储：frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
设置的成员定义：frameworks/base/core/java/android/provider/Settings.java
部分的默认值来源于：frameworks/base/packages/SettingsProvider/res/values/defaults.xml
settings代码位置在：frameworks/base/cmds/settings/settings

2.1.5 settings实例

#获取自动锁屏时间
adb shell settings list system | grep timeout                            
screen_off_timeout=300000

#设置自动锁屏时间
adb shell settings put system screen_off_timeout 2147483647

#全屏沉浸模式（包括状态栏和虚拟按键）：
adb shell settings put global policy_control immersive.full=*

#沉浸状态栏：
adb shell settings put global policy_control immersive.status=*

#沉浸虚拟按键（隐藏后底部上划可以呼出）：
adb shell settings put global policy_control immersive.navigation=*

#恢复正常模式（如果隐藏了状态栏或者虚拟按键但是又不想用了）：
adb shell settings put global policy_control null

三，系统属性读取

3.1 在adb中进行属性读取和设置

3.1.1 Settings Provider设置和读取

//查看screen_off_timeout的值，可以使用下面的命令
$ adb shell settings get system screen_off_timeout
$ 60000 

这里属性值是严格区分大小写的（全部都是小写），不存在的值或者写错就获取到null。

//修改休眠时间
$ adb shell settings put system screen_off_timeout 120000 //120秒，2分钟

3.1.2、SystemProperties属性读取和设置

C:\Users\Administrator>adb shell getprop
[apexd.status]: [ready]
[bootreceiver.enable]: [1]
[bpf.progs_loaded]: [1]
[build.version.extensions.r]: [1]
[build.version.extensions.s]: [1]
[cache_key.bluetooth.get_adapter_connection_state]: [7470926241194665063]
[cache_key.bluetooth.get_bond_state]: [7470926241194665059]
[cache_key.bluetooth.get_profile_connection_state]: [7470926241194665064]
[cache_key.bluetooth.get_state]: [7470926241194665065]
[cache_key.bluetooth.is_offloaded_filtering_supported]: [7470926241194665060]
[cache_key.display_info]: [6176213068958815969]
[cache_key.get_packages_for_uid]: [6176213068958816006]
[cache_key.has_system_feature]: [6176213068958815942]
[cache_key.is_compat_change_enabled]: [6176213068958816008]
[cache_key.is_interactive]: [6176213068958815922]
[cache_key.is_power_save_mode]: [6176213068958815957]
[cache_key.is_user_unlocked]: [6176213068958815983]
[cache_key.location_enabled]: [6176213068958815956]
[cache_key.package_info]: [6176213068958816009]
[cache_key.system_server.accounts_data]: [6176213068958815987]
[dalvik.vm.appimageformat]: [lz4]
[dalvik.vm.boot-dex2oat-threads]: [8]
[dalvik.vm.dex2oat-Xms]: [64m]
[dalvik.vm.dex2oat-Xmx]: [512m]
[dalvik.vm.dex2oat-max-image-block-size]: [524288]
[dalvik.vm.dex2oat-minidebuginfo]: [true]
[dalvik.vm.dex2oat-resolve-startup-strings]: [true]
[dalvik.vm.dex2oat-threads]: [8]
[dalvik.vm.dex2oat-updatable-bcp-packages-file]: [/system/etc/updatable-bcp-packages.txt]
[dalvik.vm.dexopt.secondary]: [true]
[dalvik.vm.dexopt.thermal-cutoff]: [2]
[dalvik.vm.heapgrowthlimit]: [192m]
[dalvik.vm.heapmaxfree]: [8m]
[dalvik.vm.heapminfree]: [512k]
[dalvik.vm.heapsize]: [512m]
[dalvik.vm.heapstartsize]: [16m]
[dalvik.vm.heaptargetutilization]: [0.75]
[dalvik.vm.image-dex2oat-Xms]: [64m]
[dalvik.vm.image-dex2oat-Xmx]: [64m]
[dalvik.vm.isa.arm.features]: [default]
[dalvik.vm.isa.arm.variant]: [cortex-a76]
[dalvik.vm.isa.arm64.features]: [default]
[dalvik.vm.isa.arm64.variant]: [cortex-a76]
[dalvik.vm.lockprof.threshold]: [500]
[dalvik.vm.madvise.artfile.size]: [4294967295]
[dalvik.vm.madvise.odexfile.size]: [104857600]
[dalvik.vm.madvise.vdexfile.size]: [104857600]
[dalvik.vm.minidebuginfo]: [true]
[dalvik.vm.usejit]: [true]
[dalvik.vm.usejitprofiles]: [true]
[debug.atrace.tags.enableflags]: [0]
[debug.force_rtl]: [false]
[debug.hwui.use_partial_updates]: [false]
[debug.nfc.fw_download]: [false]
[debug.nfc.se]: [false]
[debug.tracing.screen_brightness]: [0.5]
[dev.bootcomplete]: [1]
[dev.mnt.blk.odm]: [dm-4]
[dev.mnt.blk.odm_dlkm]: [dm-5]
[dev.mnt.blk.product]: [dm-6]
[dev.mnt.blk.root]: [dm-0]
[dev.mnt.blk.system_ext]: [dm-1]
[dev.mnt.blk.vendor]: [dm-2]
[dev.mnt.blk.vendor_dlkm]: [dm-3]
[drm.service.enabled]: [true]
[dumpstate.completed]: [1]
[dumpstate.last_id]: [2]
[external_storage.casefold.enabled]: [1]
[external_storage.projid.enabled]: [1]
[external_storage.sdcardfs.enabled]: [0]
[graphics.gpu.profiler.support]: [true]
[gsid.image_installed]: [0]
[gsm.ignore-nitz]: [yes]
[hwservicemanager.ready]: [true]
[init.svc.adbd]: [running]
[init.svc.akmd]: [stopped]
[init.svc.android-hardware-media-c2-hal-1-1]: [running]
[init.svc.apexd]: [stopped]
[init.svc.apexd-bootstrap]: [stopped]
[init.svc.apexd-snapshotde]: [stopped]
[init.svc.audioserver]: [running]
[init.svc.bootanim]: [stopped]
[init.svc.boringssl_self_test32]: [stopped]
[init.svc.boringssl_self_test32_vendor]: [stopped]
[init.svc.boringssl_self_test64]: [stopped]
[init.svc.boringssl_self_test64_vendor]: [stopped]
[init.svc.boringssl_self_test_apex32]: [stopped]
[init.svc.boringssl_self_test_apex64]: [stopped]
[init.svc.bpfloader]: [stopped]
[init.svc.cameraserver]: [running]
[init.svc.console]: [running]
[init.svc.credstore]: [running]
[init.svc.derive_classpath]: [stopped]
[init.svc.derive_sdk]: [stopped]
[init.svc.drm]: [running]
[init.svc.dump_kernel_panic]: [stopped]
[init.svc.eGTouchD]: [running]
[init.svc.gatekeeperd]: [running]
[init.svc.gpu]: [running]
[init.svc.hdcp2_hdmi]: [stopped]
[init.svc.hdmi_server]: [running]
[init.svc.health-hal-2-1]: [running]
[init.svc.heapprofd]: [stopped]
[init.svc.hidl_memory]: [running]
[init.svc.hwservicemanager]: [running]
[init.svc.idmap2d]: [stopped]
[init.svc.incidentd]: [running]
[init.svc.installd]: [running]
[init.svc.keystore2]: [running]
[init.svc.lcdparamservice]: [running]
[init.svc.lmkd]: [running]
[init.svc.logd]: [running]
[init.svc.logd-auditctl]: [stopped]
[init.svc.logd-reinit]: [stopped]
[init.svc.media]: [running]
[init.svc.media.swcodec]: [running]
[init.svc.media.tuner]: [running]
[init.svc.mediadrm]: [running]
[init.svc.mediaextractor]: [running]
[init.svc.mediametrics]: [running]
[init.svc.netd]: [running]
[init.svc.network_coexist]: [stopped]
[init.svc.odsign]: [stopped]
[init.svc.oemscript]: [stopped]
[init.svc.ril-daemon]: [running]
[init.svc.rknn_server]: [running]
[init.svc.rockchip.drmservice]: [stopped]
[init.svc.rockchip_udc_detector]: [stopped]
[init.svc.servicemanager]: [running]
[init.svc.simple_bugreportd]: [stopped]
[init.svc.statsd]: [running]
[init.svc.storaged]: [running]
[init.svc.surfaceflinger]: [running]
[init.svc.system_suspend]: [running]
[init.svc.tee-supplicant]: [running]
[init.svc.tombstoned]: [running]
[init.svc.traced]: [running]
[init.svc.traced_perf]: [stopped]
[init.svc.traced_probes]: [running]
[init.svc.ueventd]: [running]
[init.svc.usbd]: [stopped]
[init.svc.vendor.audio-hal]: [running]
[init.svc.vendor.bluetooth-1-0]: [running]
[init.svc.vendor.camera-provider-2-4]: [running]
[init.svc.vendor.camera-provider-2-4-ext]: [running]
[init.svc.vendor.cas-hal-1-2]: [running]
[init.svc.vendor.drm-clearkey-hal-1-4]: [running]
[init.svc.vendor.drm-widevine-hal-1-4]: [running]
[init.svc.vendor.gatekeeper-1-0]: [running]
[init.svc.vendor.gnss-2-0]: [running]
[init.svc.vendor.gralloc-4-0]: [running]
[init.svc.vendor.hwcomposer-2-1]: [running]
[init.svc.vendor.insmod_sh]: [stopped]
[init.svc.vendor.keymint-default]: [running]
[init.svc.vendor.light-rockchip]: [running]
[init.svc.vendor.media.omx]: [running]
[init.svc.vendor.move_data_sh]: [stopped]
[init.svc.vendor.outputmanager-1-0]: [running]
[init.svc.vendor.power-aidl-rockchip]: [running]
[init.svc.vendor.radio-1-2]: [running]
[init.svc.vendor.radio-config-hal-1-0]: [running]
[init.svc.vendor.rknn-1-0]: [running]
[init.svc.vendor.rockit-hal-1-0]: [running]
[init.svc.vendor.sensors-hal-1-0]: [running]
[init.svc.vendor.tv-input-1-0]: [running]
[init.svc.vendor.weaver-hal-1-0]: [running]
[init.svc.vendor.wifi_hal_legacy]: [running]
[init.svc.vndservicemanager]: [running]
[init.svc.vold]: [running]
[init.svc.wificond]: [running]
[init.svc.zygote]: [running]
[init.svc.zygote_secondary]: [running]
[init.svc_debug_pid.adbd]: [720]
[init.svc_debug_pid.akmd]: []
[init.svc_debug_pid.android-hardware-media-c2-hal-1-1]: [380]
[init.svc_debug_pid.apexd]: []
[init.svc_debug_pid.apexd-bootstrap]: []
[init.svc_debug_pid.apexd-snapshotde]: []
[init.svc_debug_pid.audioserver]: [393]
[init.svc_debug_pid.bootanim]: []
[init.svc_debug_pid.boringssl_self_test32]: []
[init.svc_debug_pid.boringssl_self_test32_vendor]: []
[init.svc_debug_pid.boringssl_self_test64]: []
[init.svc_debug_pid.boringssl_self_test64_vendor]: []
[init.svc_debug_pid.boringssl_self_test_apex32]: []
[init.svc_debug_pid.boringssl_self_test_apex64]: []
[init.svc_debug_pid.bpfloader]: []
[init.svc_debug_pid.cameraserver]: [439]
[init.svc_debug_pid.console]: [287]
[init.svc_debug_pid.credstore]: [394]
[init.svc_debug_pid.derive_classpath]: []
[init.svc_debug_pid.derive_sdk]: []
[init.svc_debug_pid.drm]: [429]
[init.svc_debug_pid.dump_kernel_panic]: []
[init.svc_debug_pid.eGTouchD]: [433]
[init.svc_debug_pid.gatekeeperd]: [514]
[init.svc_debug_pid.gpu]: [395]
[init.svc_debug_pid.hdcp2_hdmi]: []
[init.svc_debug_pid.hdmi_server]: [388]
[init.svc_debug_pid.health-hal-2-1]: [379]
[init.svc_debug_pid.heapprofd]: []
[init.svc_debug_pid.hidl_memory]: [367]
[init.svc_debug_pid.hwservicemanager]: [285]
[init.svc_debug_pid.idmap2d]: []
[init.svc_debug_pid.incidentd]: [441]
[init.svc_debug_pid.installd]: [442]
[init.svc_debug_pid.keystore2]: [322]
[init.svc_debug_pid.lcdparamservice]: [438]
[init.svc_debug_pid.lmkd]: [283]
[init.svc_debug_pid.logd]: [282]
[init.svc_debug_pid.logd-auditctl]: []
[init.svc_debug_pid.logd-reinit]: []
[init.svc_debug_pid.media]: [445]
[init.svc_debug_pid.media.swcodec]: [457]
[init.svc_debug_pid.media.tuner]: [446]
[init.svc_debug_pid.mediaextractor]: [443]
[init.svc_debug_pid.mediametrics]: [444]
[init.svc_debug_pid.netd]: [361]
[init.svc_debug_pid.network_coexist]: []
[init.svc_debug_pid.odsign]: []
[init.svc_debug_pid.oemscript]: []
[init.svc_debug_pid.ril-daemon]: [452]
[init.svc_debug_pid.rknn_server]: [289]
[init.svc_debug_pid.rockchip.drmservice]: []
[init.svc_debug_pid.rockchip_udc_detector]: []
[init.svc_debug_pid.servicemanager]: [284]
[init.svc_debug_pid.simple_bugreportd]: []
[init.svc_debug_pid.statsd]: [360]
[init.svc_debug_pid.storaged]: [447]
[init.svc_debug_pid.surfaceflinger]: [396]
[init.svc_debug_pid.system_suspend]: [321]
[init.svc_debug_pid.tee-supplicant]: [320]
[init.svc_debug_pid.tombstoned]: [340]
[init.svc_debug_pid.traced]: [432]
[init.svc_debug_pid.traced_perf]: []
[init.svc_debug_pid.traced_probes]: [430]
[init.svc_debug_pid.ueventd]: [262]
[init.svc_debug_pid.usbd]: []
[init.svc_debug_pid.vendor.audio-hal]: [368]
[init.svc_debug_pid.vendor.bluetooth-1-0]: [369]
[init.svc_debug_pid.vendor.camera-provider-2-4]: [371]
[init.svc_debug_pid.vendor.camera-provider-2-4-ext]: [370]
[init.svc_debug_pid.vendor.cas-hal-1-2]: [372]
[init.svc_debug_pid.vendor.drm-clearkey-hal-1-4]: [373]
[init.svc_debug_pid.vendor.drm-widevine-hal-1-4]: [374]
[init.svc_debug_pid.vendor.gatekeeper-1-0]: [375]
[init.svc_debug_pid.vendor.gnss-2-0]: [376]
[init.svc_debug_pid.vendor.gralloc-4-0]: [377]
[init.svc_debug_pid.vendor.hwcomposer-2-1]: [378]
[init.svc_debug_pid.vendor.insmod_sh]: []
[init.svc_debug_pid.vendor.keymint-default]: [288]
[init.svc_debug_pid.vendor.light-rockchip]: [386]
[init.svc_debug_pid.vendor.media.omx]: [449]
[init.svc_debug_pid.vendor.move_data_sh]: []
[init.svc_debug_pid.vendor.outputmanager-1-0]: [390]
[init.svc_debug_pid.vendor.power-aidl-rockchip]: [387]
[init.svc_debug_pid.vendor.radio-1-2]: [382]
[init.svc_debug_pid.vendor.radio-config-hal-1-0]: [381]
[init.svc_debug_pid.vendor.rknn-1-0]: [389]
[init.svc_debug_pid.vendor.rockit-hal-1-0]: [391]
[init.svc_debug_pid.vendor.sensors-hal-1-0]: [383]
[init.svc_debug_pid.vendor.tv-input-1-0]: [392]
[init.svc_debug_pid.vendor.weaver-hal-1-0]: [384]
[init.svc_debug_pid.vendor.wifi_hal_legacy]: [385]
[init.svc_debug_pid.vndservicemanager]: [286]
[init.svc_debug_pid.vold]: [291]
[init.svc_debug_pid.wificond]: [448]
[init.svc_debug_pid.zygote]: [362]
[init.svc_debug_pid.zygote_secondary]: [363]
[keyguard.no_require_sim]: [true]
[keystore.boot_level]: [1000000000]
[keystore.crash_count]: [0]
[khungtask.enable]: [false]
[llk.enable]: [false]
[log.tag.APM_AudioPolicyManager]: [D]
[log.tag.stats_log]: [I]
[logd.logpersistd.enable]: [true]
[media.sink.audio]: [LPCM,
]
[net.bt.name]: [Android]
[net.qtaguid_enabled]: [1]
[net.tcp_def_init_rwnd]: [60]
[odsign.key.done]: [1]
[odsign.verification.done]: [1]
[odsign.verification.success]: [0]
[persist.bluetooth.btsnoopdefaultmode]: []
[persist.bluetooth.btsnooplogmode]: [disable]
[persist.bluetooth.btsnooppath]: [/data/misc/bluedroid/btsnoop_hci.cfa]
[persist.bluetooth.btsnoopsize]: [0xffff]
[persist.bluetooth.showdeviceswithoutnames]: [false]
[persist.bt.power.down]: [true]
[persist.dbg.keep_debugfs_mounted]: [1]
[persist.debug.dalvik.vm.core_platform_api_policy]: [just-warn]
[persist.device_config.attempted_boot_count]: [0]
[persist.enable_task_snapshots]: [false]
[persist.net.data.score]: [100]
[persist.net.eth0.score]: [400]
[persist.net.eth1.score]: [300]
[persist.net.network_coexist]: [false]
[persist.net.network_priority]: [0]
[persist.net.wifi.score]: [200]
[persist.netd.stable_secret]: [49fd:3efd:7045:d23:203d:1ad:28e4:fa68]
[persist.service.bdroid.bdaddr]: [22:22:69:0d:0c:00]
[persist.sys.audio_gain_level]: [1]
[persist.sys.boot.reason]: []
[persist.sys.boot.reason.history]: [reboot,1520046188
reboot,loader,1690445810
reboot,userrequested,1690409354]
[persist.sys.carkey.mode]: [0]
[persist.sys.dalvik.vm.lib.2]: [libart.so]
[persist.sys.device_provisioned]: [1]
[persist.sys.displayinset.top]: [0]
[persist.sys.dpi]: [1]
[persist.sys.enable_ethernet_tethering]: [0]
[persist.sys.fuse]: [true]
[persist.sys.fuse.passthrough.enable]: [true]
[persist.sys.hdmi_audio_mode]: [1]
[persist.sys.hdmiinmode]: [2]
[persist.sys.hidnotify.enable]: [false]
[persist.sys.ison]: [false]
[persist.sys.lmk.reportkills]: [true]
[persist.sys.mipicam_mirror]: [1]
[persist.sys.mipicam_orientation]: [0]
[persist.sys.provider.uid]: [10082]
[persist.sys.repeat.shundown]: [1]
[persist.sys.rotation.efull-1]: [true]
[persist.sys.rotation.einit-1]: [0]
[persist.sys.strictmode.visual]: [false]
[persist.sys.theme]: [1]
[persist.sys.timezone]: [Asia/Shanghai]
[persist.sys.ts.disable]: [0]
[persist.sys.usb.config]: [adb]
[persist.sys.usbcam_mirror]: [1]
[persist.sys.usbcam_orientation]: [0]
[persist.sys.usbmode]: [0]
[persist.sys.zram_enabled]: [1]
[persist.traced.enable]: [1]
[persist.usb.mode]: [0]
[persist.vendor.bluetooth.prefferedrole]: [master]
[persist.vendor.bluetooth.rtkcoex]: [true]
[persist.vendor.camera.debug.logfile]: [0]
[persist.vendor.primary_display_orientation]: [0]
[persist.vendor.rtkbt.bdaddr_path]: [none]
[persist.vendor.rtkbtadvdisable]: [false]
[persist.vendor.sys.hid]: []
[persist.wifi.sleep.delay.ms]: [0]
[pm.dexopt.ab-ota]: [speed-profile]
[pm.dexopt.bg-dexopt]: [speed-profile]
[pm.dexopt.boot-after-ota]: [verify]
[pm.dexopt.cmdline]: [verify]
[pm.dexopt.first-boot]: [verify]
[pm.dexopt.inactive]: [verify]
[pm.dexopt.install]: [speed-profile]
[pm.dexopt.install-bulk]: [speed-profile]
[pm.dexopt.install-bulk-downgraded]: [verify]
[pm.dexopt.install-bulk-secondary]: [verify]
[pm.dexopt.install-bulk-secondary-downgraded]: [extract]
[pm.dexopt.install-fast]: [skip]
[pm.dexopt.post-boot]: [extract]
[pm.dexopt.shared]: [speed]
[ril.function.dataonly]: [1]
[rild.libargs]: [-d]
[rild.simcom.gps]: [1]
[rild.simcom.iprulemain]: [1]
[ro.actionable_compatible_property.enabled]: [true]
[ro.allow.mock.location]: [0]
[ro.audio.monitorOrientation]: [true]
[ro.baseband]: [unknown]
[ro.bionic.2nd_arch]: [arm]
[ro.bionic.2nd_cpu_variant]: [cortex-a76]
[ro.bionic.arch]: [arm64]
[ro.bionic.cpu_variant]: [cortex-a76]
[ro.board.platform]: [rk3588]
[ro.boot.boot_devices]: [fe2e0000.mmc]
[ro.boot.bootreason]: [reboot]
[ro.boot.console]: [ttyFIQ0]
[ro.boot.dtb_idx]: [0]
[ro.boot.dtbo_idx]: [0]
[ro.boot.dynamic_partitions]: [true]
[ro.boot.flash.locked]: [0]
[ro.boot.hardware]: [rk30board]
[ro.boot.mode]: [normal]
[ro.boot.noril]: [false]
[ro.boot.selinux]: [permissive]
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[vendor.hwc.device.display-1]: [HDMI-A-1:70:connected]
[vendor.hwc.device.extend]: [HDMI-A,eDP]
[vendor.hwc.device.primary]: [DSI]
[vendor.hwc.hdr_state]: [NORMAL]
[vendor.realtek.bluetooth.chip_name]: [8821CU or 8821CUH]
[vendor.realtek.bluetooth.en]: [false]
[vendor.rild.libpath]: [/vendor/lib64/hw/libril_ec2x.so]
[vendor.rild.libpath.ec2x]: [/vendor/lib64/hw/libril_ec2x.so]
[vendor.rild.libpath.me3630]: [/vendor/lib64/hw/libril_me3630.so]
[vendor.rild.libpath.n58]: [/vendor/lib64/hw/libril_n58.so]
[vendor.rild.libpath.nl668]: [/vendor/lib64/hw/libril_nl668.so]
[vendor.rild.libpath.rg200]: [/vendor/lib64/hw/libril_rg200.so]
[vendor.rild.libpath.rx500]: [/vendor/lib64/hw/libril_rx500.so]
[vendor.rild.libpath.sim7600]: [/vendor/lib64/hw/libril_sim7600.so]
[vendor.security.tee_supplicant]: [1]
[vendor.serialno]: [93c3e5cef612a187]
[vendor.shutdown_anim.orien]: [0]
[vendor.usb.controller]: [fc000000.usb]
[vold.has_adoptable]: [0]
[vold.has_compress]: [0]
[vold.has_quota]: [1]
[vold.has_reserved]: [1]
[wifi.interface]: [wlan0]
[wifi.supplicant_scan_interval]: [15]
[wlan.driver.status]: [ok]

C:\Users\Administrator>adb shell getprop ro.serialno
93c3e5cef612a187

3.2 Android代码中进行属性读取和设置

3.2.1 Settings Provider设置和读取

Settings Provider是指通过如下方式设置的系统变量数据库：

//读取
Settings.System.getInt(Context.getContentResolver(), "xxx", 1);
Settings.System.getString(Context.getContentResolver(), "xxx", "1");
Settings.System.getLong(Context.getContentResolver(), "xxx", 1);
Settings.System.getFloat(Context.getContentResolver(), "xxx", 1);
//设置
Settings.System.putInt(Context.getContentResolver(), "xxx", 1);
Settings.System.putString(Context.getContentResolver(), "xxx", "1");
Settings.System.putLong(Context.getContentResolver(), "xxx", 1);
Settings.System.putFloat(Context.getContentResolver(), "xxx", 1);
xxx表示属性，比如：screen_off_timeout

3.2.2 SystemProperties设置和读取

/**
     * 设置属性值
     *
     * @param key   长度不能超过31，key.length <= 30
     * @param value 长度不能超过91，value.length<=90
     */
    public static void set(String key, String value) {
        // android.os.SystemProperties
        // public static void set(String key, String val)
        try {
            Class cls = Class.forName("android.os.SystemProperties");
            Method method = cls.getMethod("set", String.class, String.class);
            method.invoke(null, key, value);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 获取属性值
     *
     * @param key 长度不能超过31，key.length <= 30
     * @param defValue
     * @return
     */
    public static String get(String key, String defValue) {
        // android.os.SystemProperties
        // public static String get(String key, String def)
        try {
            Class cls = Class.forName("android.os.SystemProperties");
            Method method = cls.getMethod("get", String.class, String.class);
            return (String) method.invoke(null, key, defValue);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return defValue;
    }
 
}

但反射对android11及以上，无法使用，android11接口定义如下，

    @NonNull
    @SystemApi
    @TestApi
    public static String get(@NonNull String key) {
        if (TRACK_KEY_ACCESS) onKeyAccess(key);
        return native_get(key);
    }

可以看出，@SystemApi描述的为系统api，需要系统权限。解决思路授予应用系统权限。