ActivityManager.forceStopPackage() from Task Manager

Question

This is my first time posting here. I\'m not sure if this is the right place to ask this question, but I don\'t seem to find other more appropriate places. Here\'s my questi

Answer 1

The "android.permission.FORCE_STOP_PACKAGES" permission is protected by the platform signature.

If you have Android source code then check the declaration of the permission:

/frameworks/base/core/res/AndroidManifest.xml

...
    <permission android:name="android.permission.FORCE_STOP_PACKAGES"
        android:permissionGroup="android.permission-group.SYSTEM_TOOLS"
        android:protectionLevel="signature"
...

You can see its protection level is signature, then check the SDK documentation for the explaination:

"android:protectionLevel"

http://developer.android.com/guide/topics/manifest/permission-element.html#plevel

"signature...A permission that the system grants only if the requesting application is signed with the same certificate as the application that declared the permission. If the certificates match, the system automatically grants the permission without notifying the user or asking for the user's explicit approval"

The permission is declared by the framework-res which is signed by the platform signature, so the application that wants to use the permission shall also be signed with the same signature.

/frameworks/base/core/res/Android.mk

...
     LOCAL_PACKAGE_NAME := framework-res
     LOCAL_CERTIFICATE := platform
...

Regards

Ziteng Chen