Lecture 16: Sending Broadcasts & Ordered Broadcasts

Question 1

The simplest implementation of sending broadcasts just uses the __ method with a __

Answer 1

• sendBroadcast()
• custom intent

Question 2

The intent only requires a defined __

Answer 2

action

Question 3

Write simple code making an intent and sending a broadcast

Answer 3

Intent intent = new Intent();
intent.setAction(“com.cosc326.broadcast.MY_COOL_ACTION”);
sendBroadcast(intent);

Question 4

The only alternation required to the previous manifest-registered receiver is a ___

Answer 4

change to the action of the intent filter

Question 5

The action specific in the intent-filter must be __

Answer 5

identical to the action specified in the intent used to generated the broadcast

Question 6

We can filter who actually receives broadcasts based on metrics such as?

Answer 6

permissions, package, ordering

Question 7

We can also change the ___ and ___ of when broadcasts are received

Answer 7

• ordering
• timing

Question 8

How can you filter which receivers get a broadcast based on package

Answer 8

Use setPackage() on the custom intent before calling sendBroadcast()

Intent intent = new Intent();
intent.setAction(“com.cosc326.broadcast.MY_COOL_ACTION”);
intent.setPackage(“com.326”);
sendBroadcast(intent);

Question 9

How can you filter which receivers get a broadcast based on permission

Answer 9

Require the receiver to have permissions to get the broadcast

Question 10

To send with a permission requirement, we can ___

Answer 10

reference the permission with Manifest.permission and pass it as a second argument to sendBroadcast

Intent intent = new Intent();
intent.setAction(“com.cosc326.broadcast.MY_COOL_ACTION”);
sendBroadcast(intent, Manigst.permission.BLUETOOTH_CONNECT)

Question 11

What is a orded broadcast

Answer 11

A more specialized form of broadcast that allows for ordering priority of receivers and the passing of data from one receiver to the next

Question 12

What does a bucket brigade refer to?

Answer 12

A broadcast may be caught be a receiver and the results then forwarded on to the next receiver in the ordered queue until a receiver aborts it

Question 13

While an ordered broadcast can use permissions and package name filtering like a normal broadcast, it primarily uses __

Answer 13

An integer priority to determine which receiver gets the broadcast first

Question 14

How do ordered broadcasts work differently than typical broadcasts?

Answer 14

They are asynchronous meaning that an ordered broadcast call immediately returns while the broadcast is passed around in the background.

The broadcast is not sent to all receivers at once, only to the first receiver in the order queue.

Question 15

When using an integer priority the higher the priority value the ___

Answer 15

More likely it is the receiver is the preferred receiver for the broadcast

Question 16

How do you send ordered broadcasts

Answer 16

Call sendOrderedBroadcast() with the intent

This will automatically pass the broadcast to the receiver with a matching intent and the highest possible priority value

Question 17

The broadcast receiver that is handling the ordered broadcast will have an ___ method just like a normal receiver

Answer 17

onReceive()

Question 18

Within the onReceive() method used to handle ordered broadcasts the receiver with either ___ or ___

Answer 18

• Call abortBroadcast() to terminate the current ordered broadcast
• Call setResult() which will allow you to pass along a result code, some data and optional extras

Question 19

Like receiving a broadcast, sending a broadcast doesn’t require any specific system ___ in most cases

Answer 19

permissions

Question 20

You may not use default system intents for your broadcast, you must use a ___ that identifies the ___

Answer 20

• Custom intent
• package that the intent originated from and is unique

Question 21

Additional ___ can be added such as requiring permissions or restricting broadcasts to particular package namespaces

Answer 21

filtering elements

Question 22

For even more control, ordered broadcasts allow ___ to take part in one ___ in an orderly form

Answer 22

• multiple receivers
• broadcast