Enforcing Permissions when Sending Broadcasts
In addition to the permission enforcing who can send Intents to a
registered BroadcastReceiver (as described above), you
can also specify a required permission when sending a broadcast. By calling Context.sendBroadcast() with a
permission string, you require that a receiver's application must hold that
permission in order to receive your broadcast.
Note that both a receiver and a broadcaster can require a permission. When
this happens, both permission checks must pass for the Intent to be delivered
to the associated target.