Android Training session at Jaxara IT

1. ANDROID TRAINING
SESSION – 3
-Hussain KMR Behestee

2. AGENDAS
• Intents
– Explicit Intents
– Implicit intents
• Broadcast Receivers
• Notifications & Toasts

3. EXPLICIT INTENTS
• We saw some Explicit Intents in previous
session.
• Today we will see few more, like as
– Start another activity
– Start another activity with sending data
– Start another activity for getting result

4. START ANOTHER ACTIVITY
• Start another activity
• Start another activity with sending data
• Receive data

5. START ANOTHER ACTIVITY FOR
GETTING RESULT
• Start activity to get result
• Callback

6. START ANOTHER ACTIVITY FOR
GETTING RESULT
• Send back to caller activity
• Please see here for details.

7. IMPLICIT INTENT
• Implicit intent are those which intents have no
specific activity to show. We will learn here-
– Call other app to share your content
– Allow other apps to start your activity
– Call other app to do a task
– Caution

8. CALL OTHER APP TO SHARE YOUR
CONTENT
• Initiating call-
• This will show all applications
which are registered for this type.
• To get registered to response you
have allow them.

9. ALLOW OTHER APP TO START YOUR
ACTIVITY
• Add Intent Filter to manifest
• Add mime type as much you want to register.

10. EXTRA
• Install apps to simulator
– adb install <file>

11. IMPLICIT INTENT: CAUTION
• Caution: If you invoke an intent and there is no app available on the device
that can handle the intent, your app will crash.
• To verify there is an activity available that can respond to the intent, call
queryIntentActivities() to get a list of activities capable of handling your
Intent. If the returned List is not empty, you can safely use the intent. For
example:
• Please see details at here.

12. CALL OTHER APP TO SHARE YOUR
CONTENT
• Safe call with create chooser

13. BROADCAST RECEIVERS
• A broadcast receiver is a component that
responds to system-wide Broadcast
announcements.
• Many broadcasts originate from the system
– For example, a Broadcast announcing that the
screen has turned off, the battery is low, or a
picture was captured or an SMS is received.

14. BROADCAST RECEIVERS
• Applications can also initiate broadcasts—for
example, to let other applications know that
some data has been downloaded to the
device and is available for them to use.
• Although broadcast receivers don't display a
user interface, they may create a status bar
notification to alert the user when a broadcast
event occurs.

15. BROADCAST RECEIVERS
• To receive a broadcast when SMS received

16. BROADCAST RECEIVERS
• In manifest

17. NOTIFICATION
• Toast Display
– Toast.makeText(context, str,Toast.LENGTH_LONG).show();
• Notification drawer
– On Next Session ;-)

18. QUESTION?

19. THANK YOU