Android之dumpsys

dumpsys一个很牛逼的调试工具，功能都有待挖掘～

dumpsys的源码位于frameworks/native/cmds/dumpsys 目录下，使用" dumpsys -l "命令列出dumpsys工具支持的option list：

shell@mx3:/ $ dumpsys -l
dumpsys -l
Currently running services:
  Exynos.HWCService
  SurfaceFlinger
  access_control
  accessibility
  account
  activity
  alarm
  android.security.keys
  appops
  appwidget
  audio
  backup
  battery
  batterypropreg
  batterystats
  bluetooth_manager
  clipboard
  com.broadcom.nfc.Fact
  com.vzw.nfc.AidFilter
  commontime_management
  connectivity
  consumer_ir
  content
  country_detector
  cpuinfo
  dbinfo
  device_policy
  devicestoragemonitor
  diskstats
  display
  dreams
  drm.drmManager
  dropbox
  entropy
  flyme_theme
  gfxinfo
  hardware
  input
  input_method
  iphonesubinfo
  isms
  location
  lock_settings
  media.audio_flinger
  media.audio_policy
  media.camera
  media.player
  media_router
  meizu.camera
  meizu.syncatservice
  meminfo
  mount
  netpolicy
  netstats
  network_management
  nfc
  notification
  package
  permission
  phone
  power
  pppoe
  print
  procstats
  samba_client
  samba_server
  samplingprofiler
  scheduling_policy
  search
  sensorservice
  serial
  servicediscovery
  simphonebook
  sip
  statusbar
  telephony.registry
  textservices
  uimode
  updatelock
  usagestats
  usb
  user
  vibrator
  wallpaper
  wifi
  wifip2p
  window
shell@mx3:/ $

每一个option都是一个sub command，如dumpsys window：

shell@mx3:/ $ dumpsys window -h
dumpsys window -h
Window manager dump options:
  [-a] [-h] [cmd] ...
  cmd may be one of:
    l[astanr]: last ANR information
    p[policy]: policy state
    a[animator]: animator state
    s[essions]: active sessions
    d[isplays]: active display contents
    t[okens]: token list
    w[indows]: window list
  cmd may also be a NAME to dump windows.  NAME may
    be a partial substring in a window name, a
    Window hex object identifier, or
    "all" for all windows, or
    "visible" for the visible windows.
  -a: include all available server state.
shell@mx3:/ $

使用sub command中的option：

shell@mx3:/ $ dumpsys window l
dumpsys window l
WINDOW MANAGER LAST ANR (dumpsys window lastanr)
  <no ANR has occurred since boot>
shell@mx3:/ $

查看last ANR information~

详细挖掘这些工具能极大的提高调试的效率～