Книга: Beginning Android

Enforcing Permissions Elsewhere

Enforcing Permissions Elsewhere

In your code, you have two additional ways to enforce permissions.

Your services can check permissions on a per-call basis via checkCallingPermission(). This returns PERMISSION GRANTED or PERMISSION DENIED, depending on whether the caller has the permission you specified. For example, if your service implements separate read and write methods, you could get the effect of readPermission and writePermission in code by checking those methods for the permissions you need from Java.

Also, you can include a permission when you call sendBroadcast(). This means that eligible receivers must hold that permission; those without the permission are ineligible to receive it. For example, the Android subsystem presumably includes the RECEIVE SMS permission when it broadcasts that an SMS message has arrived — this will restrict the receivers of that intent to be only those authorized to receive SMS messages.

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