Android - CommonsWare

Requesting and Requiring Permissions
depending on if something else is catching and trying to handle that
exception. Note that you will only fail on a permission check if you forgot to
ask for the permission – it is impossible for your application to be running
and not have been granted your requested permissions.
Halt! Who Goes There?
The other side of the coin, of course, is to secure your own application. If
your application is merely activities and intent receivers, security may be
just an “outbound” thing, where you request the right to use resources of
other applications. If, on the other hand, you put content providers or
services in your application, you will want to implement “inbound” security
to control which applications can do what with the data.
Note that the issue here is less about whether other applications might
“mess up” your data, but rather about privacy of the user's information or
use of services that might incur expense. That is where the stock
permissions for built-in Android applications are focused – can you read or
modify contacts, can you send SMS, etc. If your application does not store
information that might be considered private, security is less an issue. If, on
the other hand, your application stores private data, such as medical
information, security is much more important.
The first step to securing your own application using permissions is to
declare said permissions, once again in the AndroidManifest.xml file. In this
case, instead of uses-permission, you add permission elements. Once again,
you can have zero or more permission elements, all as direct children of the
root manifest element.
Declaring a permission is slightly more complicated than using a
permission. There are three pieces of information you need to supply:
1. The symbolic name of the permission. To keep your permissions
from colliding with those from other applications, you should use
your application's Java namespace as a prefix
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