service可给Android 服务传消息，具体用法如下：
Usage: service [-h|-?]
service list
service check SERVICE
service call SERVICE CODE [i32 INT | s16 STR] ...
Options:
i32: Write the integer INT into the send parcel.
s16: Write the UTF-16 string STR into the send parcel.
在Android 4.2.2模拟器上运行如下命令：
adb shell service list
Found 68 services:
0 phone: [com.android.internal.telephony.ITelephony]
1 iphonesubinfo: [com.android.internal.telephony.IPhoneSubInfo]
2 simphonebook: [com.android.internal.telephony.IIccPhoneBook]
3 isms: [com.android.internal.telephony.ISms]
4 dreams: [android.service.dreams.IDreamManager]
5 commontime_management: []
6 samplingprofiler: []
7 diskstats: []
8 appwidget: [com.android.internal.appwidget.IAppWidgetService]
9 backup: [android.app.backup.IBackupManager]
10 uimode: [android.app.IUiModeManager]
11 serial: [android.hardware.ISerialManager]
12 usb: [android.hardware.usb.IUsbManager]
13 audio: [android.media.IAudioService]
14 wallpaper: [android.app.IWallpaperManager]
15 dropbox: [com.android.internal.os.IDropBoxManagerService]
16 search: [android.app.ISearchManager]
17 country_detector: [android.location.ICountryDetector]
18 location: [android.location.ILocationManager]
19 devicestoragemonitor: []
20 notification: [android.app.INotificationManager]
21 updatelock: [android.os.IUpdateLock]
22 throttle: [android.net.IThrottleManager]
23 servicediscovery: [android.net.nsd.INsdManager]
24 connectivity: [android.net.IConnectivityManager]
25 wifi: [android.net.wifi.IWifiManager]
26 wifip2p: [android.net.wifi.p2p.IWifiP2pManager]
27 netpolicy: [android.net.INetworkPolicyManager]
28 netstats: [android.net.INetworkStatsService]
29 textservices: [com.android.internal.textservice.ITextServicesManager]
30 network_management: [android.os.INetworkManagementService]
31 clipboard: [android.content.IClipboard]
32 statusbar: [com.android.internal.statusbar.IStatusBarService]
33 device_policy: [android.app.admin.IDevicePolicyManager]
34 lock_settings: [com.android.internal.widget.ILockSettings]
35 mount: [IMountService]
36 accessibility: [android.view.accessibility.IAccessibilityManager]
37 input_method: [com.android.internal.view.IInputMethodManager]
38 input: [android.hardware.input.IInputManager]
39 window: [android.view.IWindowManager]
40 alarm: [android.app.IAlarmManager]
41 vibrator: [android.os.IVibratorService]
42 battery: []
43 hardware: [android.os.IHardwareService]
44 content: [android.content.IContentService]
45 account: [android.accounts.IAccountManager]
46 user: [android.os.IUserManager]
47 permission: [android.os.IPermissionController]
48 cpuinfo: []
49 dbinfo: []
50 gfxinfo: []
51 meminfo: []
52 activity: [android.app.IActivityManager]
53 package: [android.content.pm.IPackageManager]
54 scheduling_policy: [android.os.ISchedulingPolicyService]
55 telephony.registry: [com.android.internal.telephony.ITelephonyRegistry]
56 display: [android.hardware.display.IDisplayManager]
57 usagestats: [com.android.internal.app.IUsageStats]
58 batteryinfo: [com.android.internal.app.IBatteryStats]
59 power: [android.os.IPowerManager]
60 entropy: []
61 sensorservice: [android.gui.SensorServer]
62 media.audio_policy: [android.media.IAudioPolicyService]
63 media.camera: [android.hardware.ICameraService]
64 media.player: [android.media.IMediaPlayerService]
65 media.audio_flinger: [android.media.IAudioFlinger]
66 drm.drmManager: [drm.IDrmManagerService]
67 SurfaceFlinger: [android.ui.ISurfaceComposer]
envsetup.sh中揭示了几条未揭露的adb shell命令：
1.绑定port启动ViewServer
adb shell service call window 1 i32 $port
2.停止ViewServer
adb shell service call window 2
3.检查ViewServer是否正在运行
adb shell service call window 3
4.按home键（详见KeyEvent.java中的定义）
adb shell input keyevent 3
5.按back键
adb shell input keyevent 4
6.按menu键
adb shell input keyevent 82
设置系统属性“viewancestor.profile_rendering”为true能强制当前窗口以60 HZ渲染。它可用作度量潜在帧率。
8.显示fps
dumpsys gfxinfo activity_name
adb shell service call SurfaceFlinger 1013 来源见SurfaceFlinger.cpp中函数onTransact的switch片段，使用见