Android session 3-behestee
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This document summarizes an Android training session on intents, broadcast receivers, and notifications. The session covers: - Explicit intents for starting activities and passing data between activities. - Implicit intents for sharing content between apps and allowing other apps to start activities. - Using broadcast receivers to respond to system-wide broadcasts and initiate broadcasts between apps. - Displaying Toast notifications and setting up notifications in the status bar (to be covered in the next session).
Android session 3-behestee
- 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