Android在shell中提供了 am 命令来发送Intent,它的源码为位于 frameworks/base/cmds/am.


它本身是用JAVA代码来实现的。


执行 am 命令其实是通过运行shell脚本 frameworks/base/cmds/am/am，然后在该脚本中运行 app_process 命令来启动am这个java程序的。


frameworks/base/cmds/am/am脚本文件如下： 


# Script to start "am" on the device, which has a very rudimentary
  
# shell.
  
#
  
base=/system
  
export CLASSPATH=$base/framework/am.jar
  
exec app_process $base/bin com.android.commands.am.Am "$@"
 

  am命令语法如下

 
am [subcommand] [options]
 
 
 

  
 
 

      start an Activity: am start [-D] [-W] <INTENT>
 
 
 

          -D: enable debugging
 
 
 

          -W: wait for launch to complete
 
 
 

  
 
 

      start a Service: am startservice <INTENT>
 
 
 

  
 
 

      send a broadcast Intent: am broadcast <INTENT>
 
 
 

  
 
 

      start an Instrumentation: am instrument [flags] <COMPONENT>
 
 
 

          -r: print raw results (otherwise decode REPORT_KEY_STREAMRESULT)
 
 
 

          -e <NAME> <VALUE>: set argument <NAME> to <VALUE>
 
 
 

          -p <FILE>: write profiling data to <FILE>
 
 
 

          -w: wait for instrumentation to finish before returning
 
 
 

  
 
 

      start profiling: am profile <PROCESS> start <FILE>
 
 
 

      stop profiling: am profile <PROCESS> stop
 
 
 

  
 
 

      start monitoring: am monitor [--gdb <port>]
 
 
 

          --gdb: start gdbserv on the given port at crash/ANR
 
 
 

  
 
 

      <INTENT> specifications include these flags:
 
 
 

          [-a <ACTION>] [-d <DATA_URI>] [-t <MIME_TYPE>]
 
 
 

          [-c <CATEGORY> [-c <CATEGORY>] ...]
 
 
 

          [-e|--es <EXTRA_KEY> <EXTRA_STRING_VALUE> ...]
 
 
 

          [--esn <EXTRA_KEY> ...]
 
 
 

          [--ez <EXTRA_KEY> <EXTRA_BOOLEAN_VALUE> ...]
 
 
 

          [-e|--ei <EXTRA_KEY> <EXTRA_INT_VALUE> ...]
 
 
 

          [-n <COMPONENT>] [-f <FLAGS>]
 
 
 

          [--grant-read-uri-permission] [--grant-write-uri-permission]
 
 
 

          [--debug-log-resolution]
 
 
 

          [--activity-brought-to-front] [--activity-clear-top]
 
 
 

          [--activity-clear-when-task-reset] [--activity-exclude-from-recents]
 
 
 

          [--activity-launched-from-history] [--activity-multiple-task]
 
 
 

          [--activity-no-animation] [--activity-no-history]
 
 
 

          [--activity-no-user-action] [--activity-previous-is-top]
 
 
 

          [--activity-reorder-to-front] [--activity-reset-task-if-needed]
 
 
 

          [--activity-single-top]
 
 
 

          [--receiver-registered-only] [--receiver-replace-pending]
 
 
 

          [<URI>]