android 安装apk包的五种方式：
1， 通过工具安装：R.P或ES等管理工具，有安装界面。
2，adb install 安装，无安装界面。
3，android market在线安装，无安装界面。
4，直接copy到系统目录/system/app下，无安装界面。此目录下的应用一般是系统自带的系统级程序和常归应用。
5，pm（android 系统自带工具） 命令行安装，无安装界面。
pm命令解析如下：
pm
usage: pm [list|path|install|uninstall]
pm list packages [-f]
pm list permission-groups
pm list permissions [-g] [-f] [-d] [-u] [GROUP]
pm list instrumentation [-f] [TARGET-PACKAGE]
pm list features
pm path PACKAGE
pm install [-l] [-r] [-t] [-i INSTALLER_PACKAGE_NAME] [-s] [-f] PATH
pm uninstall [-k] PACKAGE
pm enable PACKAGE_OR_COMPONENT
pm disable PACKAGE_OR_COMPONENT
pm setInstallLocation [0/auto] [1/internal] [2/external]
The list packages command prints all packages. Options:
-f: see their associated file.
The list permission-groups command prints all known
permission groups.
The list permissions command prints all known
permissions, optionally only those in GROUP. Options:
-g: organize by group.
-f: print all information.
-s: short summary.
-d: only list dangerous permissions.
-u: list only the permissions users will see.
The list instrumentation command prints all instrumentations,
or only those that target a specified package. Options:
-f: see their associated file.
The list features command prints all features of the system.
The path command prints the path to the .apk of a package.
The install command installs a package to the system. Options:
-l: install the package with FORWARD_LOCK.
-r: reinstall an exisiting app, keeping its data.
-t: allow test .apks to be installed.
-i: specify the installer package name.
-s: install package on sdcard.
-f: install package on internal flash.
The uninstall command removes a package from the system. Options:
-k: keep the data and cache directories around.
after the package removal.
The enable and disable commands change the enabled state of
a given package or component (written as "package/class").
The getInstallLocation command gets the current install location
0 [auto]: Let system decide the best location
1 [internal]: Install on internal device storage
2 [external]: Install on external media
The setInstallLocation command changes the default install location
0 [auto]: Let system decide the best location
1 [internal]: Install on internal device storage
2 [external]: Install on external media