Android應用程序獲取系統權限

http://hi.baidu.com/donghaozheng/blog/item/30a00d4f9fca873baec3ab69.html

The only way I know to grant system-level permissions to android apps
(right now) is to install them to /system/app.  Suppose you have an
installer program named my-installer.apk that you wish to give the
INSTALL_PACKAGES permission.  You need to declare that permission in
the manifest, and then:
adb push my-installer.apk /system/app

http://groups.google.com/group/android-developers/browse_thread/thread/23a94989d964d7fd

http://blog.csdn.net/zengyangtech/article/details/5749999

[e-mail]> wrote:
> "A permission that the system is to grant only to packages in the
> Android system image or that are signed with the same certificates."

> Could someone really clarify what is called the "system image". Could
> someone list or clarify what encompasses the term system image for
> this protection? Is it only packages that are located under directory /
> system/  or more?

It's the .apks under /system/app.

> The Framework core package is installed under /System/,

Fwiw, this is irrelevant.

> and  /frameworks/base/core/res/AndroidManifest.xml  includes API that
> are either protected by signature or SignatureorSystem.

> So, for the framework protected APIs, a Signature and
> SignatureorSystem protection make no protection difference?

Huh?  It means what it says: for someone to be granted the permission, they
must either be signed with the same certificate as the one who declared the
permission (in this case the framework in the path you supply, which is
signed with the core platform certificate), or they must be installed in the
system image.

http://groups.google.com/group/android-security-discuss/browse_thread/thread/acfe52ee02e8cc0b