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adb shell dumpsys，默认打印出当前系统所有的service信息，通常情况下我们并不想看那么多信息，可以在后面加上具体的服务名，比如想获取关于设备电池的信息，就可以使用以下命令：
>adb shell dumpsys battery
Current Battery Service state:
AC powered: false
USB powered: true
Wireless powered: false
Max charging current: 0
status: 5
health: 2
present: true
level: 100
scale: 100
voltage: 4321
temperature: 302
technology: Li-ion
获取完整的系统服务的列表可以使用以下命令：
>adb shell dumpsys -l
Currently running services:
AutoLaunch
DockObserver
SurfaceFlinger
accessibility
account
activity
alarm
alipayservice
android.App6939Service
android.hardware.fingerprint.IFingerprintDaemon
android.security.keystore
appops
appwidget
audio
backup
battery
...
几个常用的命令：
adb shell dumpsys display #获取显示相关信息，可以从中提取分辨率信息 adb shell dumpsys cpuinfo #获取CPU信息 adb shell dumpsys meminfo #获取内存信息 adb shell dumpsys meminfo PACKAGE_NAME #获取具体应用的内存信息 adb shell dumpsys activity #获取activity信息 adb shell dumpsys activity top #获取当前界面的UI信息 adb shell dumpsys activity top | findstr ACTIVITY #获取当前界面的activity adb shell dumpsys wifi #获取wifi信息 adb shell dumpsys power #获取电源管理信息，可以获取到是否处于锁屏状态：mWakefulness=Asleep或者Awake
接下来主要介绍下telephony.registry服务，这个服务是关于无线通讯的，可以从中获取无线通讯相关的参数。执行命令得到如下输出：
>adb shell dumpsys telephony.registry
last known state:
Phone Id=0 #双卡终端中的第一个卡
mCallState=0 #0表示待机状态、1表示来电未接听状态、2表示电话占线状态
mCallIncomingNumber=
mServiceState=0 0 voice home data home CMCC CMCC 46000 CMCC CMCC 46000 LTE LTE CSS not supported -1 -1 RoamInd=-1 DefRoamInd=-1 EmergOnly=false IsDataRoamingFromRegistration=false
mSignalStrength=SignalStrength: 99 0 -120 -160 -120 -1 -1 17 -113 -15 -40 2147483647 2147483647 gsm|lte
mMessageWaiting=false
mCallForwarding=false #是否启用呼叫转移
mDataActivity=0
mDataConnectionState=2
#0：无数据连接 1：正在创建数据连接 2：已连接
mDataConnectionPossible=true
#是否有数据连接
mDataConnectionReason=dataAttached
mDataConnectionApn=
mDataConnectionLinkProperties=null
mDataConnectionNetworkCapabilities=null
mCellLocation=Bundle[mParcelledData.dataSize=64]
mCellInfo=null
Phone Id=1
mCallState=0
mCallIncomingNumber=
...
除了以上注释外，接下来主要解读两个字段：mServiceState和mSignalStrength。从源码可以看出是直接打印出了类ServiceState和SignalStrength的内容：
private SignalStrength mSignalStrength = new SignalStrength(); ... pw.println("last known state:"); ... pw.println(" mServiceState=" + mServiceState); pw.println(" mSignalStrength=" + mSignalStrength); ...
ServiceState类的内容输出格式可以查看源代码https://github.com/android/platform_frameworks_base/blob/master/telephony/java/android/telephony/ServiceState.java
（搜索”toString”函数）：
@Override public String toString() { String radioTechnology = rilRadioTechnologyToString(mRilVoiceRadioTechnology); String dataRadioTechnology = rilRadioTechnologyToString(mRilDataRadioTechnology); return (mVoiceRegState + " " + mDataRegState + " " + "voice " + getRoamingLogString(mVoiceRoamingType) + " " + "data " + getRoamingLogString(mDataRoamingType) + " " + mVoiceOperatorAlphaLong + " " + mVoiceOperatorAlphaShort + " " + mVoiceOperatorNumeric + " " + mDataOperatorAlphaLong + " " + mDataOperatorAlphaShort + " " + mDataOperatorNumeric + " " + (mIsManualNetworkSelection ? "(manual)" : "") + " " + radioTechnology + " " + dataRadioTechnology + " " + (mCssIndicator ? "CSS supported" : "CSS not supported") + " " + mNetworkId + " " + mSystemId + " RoamInd=" + mCdmaRoamingIndicator + " DefRoamInd=" + mCdmaDefaultRoamingIndicator + " EmergOnly=" + mIsEmergencyOnly + " IsDataRoamingFromRegistration=" + mIsDataRoamingFromRegistration); }
如此一来，mServiceState=0 0 voice home data home CMCC CMCC 46000 CMCC CMCC 46000 LTE LTE CSS not supported -1 -1 RoamInd=-1 DefRoamInd=-1 EmergOnly=false IsDataRoamingFromRegistration=false 中各个字段的意义便一目了然了。
同样，SignalStrength类也可以找到“toString”源码：
/** * @return string representation. */ @Override public String toString() { return ("SignalStrength:" + " " + mGsmSignalStrength + " " + mGsmBitErrorRate + " " + mCdmaDbm + " " + mCdmaEcio + " " + mEvdoDbm + " " + mEvdoEcio + " " + mEvdoSnr + " " + mLteSignalStrength + " " + mLteRsrp + " " + mLteRsrq + " " + mLteRssnr + " " + mLteCqi + " " + mTdScdmaRscp + " " + (isGsm ? "gsm|lte" : "cdma")); }
从mSignalStrength=SignalStrength: 99 0 -120 -160 -120 -1 -1 17 -113 -15 -40 2147483647 2147483647 gsm|lte，可看出RSRP=-113，RSRQ=-15等等。
dumpsys命令的使用及telephony.registry解读
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原文地址：http://www.cnblogs.com/wisdom212/p/dumpsys.html
