A Joyride with Jetpack

Transcript

1. A joy ride with Jetpack Boost for App Development
3. Now, it’s official
4. Jetpack was the {{hero}}
5. Why Jetpack ? • Accelerates App Development • Eliminates Boilerplate code • Build high quality, robust apps
7. • A set of Kotlin Extensions • Made using kotlin language features like Extension Functions, Lambda, etc. • Makes your code more concise • Note: This doesn’t add any new feature to existing Android APIs Android KTX (Kotlin Extensions)
8. Why you need KTX ? Write Less.. Do More..
9. view.viewTreeObserver.addOnPreDrawListener( object : ViewTreeObserver.OnPreDrawListener { override fun onPreDraw(): Boolean { viewTreeObserver.removeOnPreDrawListener(this) actionToBeTriggered() return true } } ) You are bored writing...
10. How about this ? view.doOnPreDraw { actionToBeTriggered() }
11. This is how Kotlin defeated old Java :P
12. Wanna see what else KTX can do?
13. androidx.content val alarmManager = ContextCompat.getSystemService(this, AlarmManager::class.java) ----------------------------------------------------------------------------- sharedPreferences.edit() .putBoolean("key", value) .apply() val alarmManager = systemService<AlarmManager>() <--Deprecated val alarmManager = getSystemService<AlarmManager>() ----------------------------------------------------------------------------- sharedPreferences.edit { putBoolean("key", value) }
14. androidx.content val contentValues = ContentValues() contentValues.put("Name", "Chintan Soni") contentValues.put("Age", "??") val contentValues = contentValuesOf( Pair("Name", "Chintan Soni"), Pair("Age", "??") )
15. KTX can do even more...
16. Awesome article by Joe Birch https://goo.gl/3e8SLM
18. Let’s Play with Work Manager
19. Quiz: List background task apis.
20. Background Task Apis Threads Executors Services AsyncTasks Handlers and Loopers Jobs (Api >=21) GCMNetwork Manager Sync Adapters Loaders Alarm Managers
21. Background Task Requirements
22. Nightmare: Background Task that is deferrable and needs a guaranteed execution • Job Scheduler Api supports Api >=21 • Firebase Job Dispatcher comes with backward compatibility upto Api level 14, but requires, Google Play Services
23. Sometimes you are so helpless
24. Work Manager, at your rescue
25. Work Manager Schedule tasks that executes in Background Easy to specify: • Deferrable • Asynchronous • When to run Sits on top of all those background Apis that are deferred and requires guaranteed execution
26. Features • Constraints like only on wifi, device plugged in, etc • Backward compatible • Queryable Api Status • Chainable • Note: When system puts background restriction, it won’t run
27. When would you use WorkManager ? • Uploading logs • Applying filters to images and saving the image • Periodically syncing local data with the network • Note: SHOULD NOT use work manager to make api calls that should only work while in Foreground. We have ThreadPool for such Tasks.
28. Lets see how easy it is...
29. Add Dependency dependencies { implementation"android.arch.work:work-runtime:1.0.0-alpha04" }
30. Worker Class class CompressWorker : Worker() { override fun doWork(): Result { myCompress() return Result.SUCCESS } } This is the place where you will actually write the work that you want to do.
31. Work Request • Choose type of work request: ◦ OneTimeWorkRequest ◦ PeriodicWorkRequest • Apply Constraints val myConstraints = Constraints.Builder() .setRequiresDeviceIdle(true) .setRequiresCharging(true) .build() val compressionWork = OneTimeWorkRequestBuilder<CompressWorker>() .setConstraints(myConstraints) .build()
32. WorkManager Enqueue your work Query your work status Cancel your work // Enqueue your work WorkManager.getInstance() .enqueue(compressionWork) // Query work status with LiveData<WorkStatus> WorkManager.getInstance() .getStatusById(compressionWork.id) .observe(lifecycleOwner, Observer { workStatus -> // Do something with the status if (workStatus != null && workStatus.state.isFinished) { // ... } }) // Cancel your work WorkManager.getInstance() .cancelWorkById(compressionWorkId)
34. More on Jetpack updates Emoji Library Android Studio 3.2 Canary updates
37. No Questions...
38. Chintan Soni Sr. Software Engineer @ Simform Solutions Pvt. Ltd. Follow me on: FB: chintansoni202 Twitter: @chintansoni202