A Journey Through Android Development

Transcript

1. A Journey Through Android Development Raditya Gumay
2. Agenda Introduction • What is Android • Design Pattern • Codebase Architecture • View Architecture • Problems • Q&A
3. What is Android Android is a mobile operating system developed by Google, based on a modified version of the Linux kernel. ~ wikipedia ~ statista
4. Android A Developer’s History cupcake donut eclair froyo Ginger bread Honey comb Ice cream sandwich Jelly Bean kitkat lollipop marsmellow nougat oreo
5. Android 6.0 (Marshmellow) Behaviour Changes - Runtime Permission - Doze and App Standby API level 23
6. Runtime Permission https://developer.android.com/training/permissions/reques ting if (ContextCompat.checkSelfPermission(thisActivity, Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED) { // Permission is not granted } <manifest xmlns:android="http://schemas.android.com/apk/res/andro id" package="com.example.snazzyapp"> <uses-permission android:name="android.permission.SEND_SMS"/> <!-- other permissions go here --> <application ...> ... </application> </manifest>
7. Doze and App Standby https://developer.android.com/training/monitoring-device- state/doze-standby Doze restrictions The following restrictions apply to your apps while in Doze: •Network access is suspended. •The system ignores wake locks. •Standard AlarmManager alarms (including setExact() and setWindow()) are deferred to the next maintenance window. • If you need to set alarms that fire while in Doze, use setAndAllowWhileIdle() or setExactAndAllowWhileIdle(). • Alarms set with setAlarmClock() continue to fire normally — the system exits Doze shortly before those alarms fire. •The system does not perform Wi-Fi scans. •The system does not allow sync adapters to run. •The system does not allow JobScheduler to run. Doze checklist • If possible, use FCM for downstream messaging. • If your users must see a notification right away, make sure to use an FCM high priority message. • Provide sufficient information within the initial message payload, so subsequent network access is unnecessary. • Set critical alarms with setAndAllowWhileIdle() and setExactAndAllowWhileIdle().
8. Android 7.0 (Nougat) Behaviour Changes - Doze API level 24 When a device is on battery power, and the screen has been off for a certain time, the device enters Doze and applies the first subset of restrictions: It shuts off app network access, and defers jobs and syncs
9. Android 7.0 (Nougat) Behaviour Changes - Doze API level 24 If the device is stationary for a certain time after entering Doze, the system applies the rest of the Doze restrictions to PowerManager.WakeLock, AlarmManager alarms, GPS, and Wi-Fi scans.
10. Android 8.0 (Oreo) Behaviour Changes - Background execution limits - Android background location limits. API level 26 •Apps that are running in the background now have limits on how freely they can access background services. •Apps cannot use their manifests to register for most implicit broadcasts (that is, broadcasts that are not targeted specifically at the app). workaround
11. Android (P Preview) Behaviour Changes - App Standby Bucket API level 28, full release in Q3 • Active— An application that is currently in use by the user (app in foreground). • Working Set — An application that is not currently in use but is run quite often, likely most days. For example, even if for short periods, you’re likely to open the Twitter app several times a day. • Frequent— An application that is not currently in use but is sometimes opened throughout the week. For example, if you go running 3 times a week then the app you use to track your runs would fall into this. • Rare— An application that is rarely used on the device. For example, a ride sharing app that you may only use when you go on Holiday. • Never— An application that has been installed but never launched.
12. Android (P Preview) Behaviour Changes - App Standby Bucket API level 28, full release in Q3 System will use machine learning to determine the frequency of apps and then these will be placed into buckets based on those predictions. • In particular, the bucket determines how frequently the app's jobs run, how often the app can trigger alarms, and how often the app can receive high-priority Firebase Cloud Messaging (FCM) messages. • help to ensure that system resources are given to the apps that need them the most. https://developer.android.com/preview/features/power
13. Design Patterns in Android
14. Model View Controller
15. Model View Controller https://www.amazon.com/Android-Programming- Nerd-Ranch-Guide/dp/0134171454
16. Model View Controller How do you test MVC?
17. Model View Controller How do you test MVC? And then we can achieve testable pattern here. But, Controller still has reference to the view. So, you cant test controller by using jUnit.
18. Model View Controller Create View Interface that reference to Controller (Problem solve)
19. Model View Controller But, who’ handle UI Logic?
20. Model View Controller But, who’ handle UI Logic?
21. Model View Controller View?
22. Model View Controller Model? I don’t think so, since model handle business logic not UI Logic
23. Model View Controller
24. Model View Controller
25. Model View Presenter
26. Model View Presenter
27. Model View View Model The Reactive Patterns
28. Model View View Model
29. Model View View Model
30. Model View View Model
31. Model View View Model
32. Model View View Model
33. Model View Intent
34. Model View Intent Intents represents, name of event, click Foo Actions defines the logic that should be executed by the Processor. Processor simply executes an Action Results are the result of what have been executed inside the Processor. Their can be errors, successful execution The Reducer is responsible to generate the ViewState The State contains all the information the View needs to render itself.
35. Clean Architecture
36. Clean Architecture
37. View Architecture
38. Q&A
39. Reference - Object-Oriented Programming in C# Succinctly by Sander Rossel - Solid Principle by Gaurav Kumar Arora - Java Design Pattern by Vaskaran Sarcar - Clean Code by Robert C. Martin - Effective Java 3rd Edition by Joshua Bloch - Working with legacy code by Michael C. Feathers - Refactoring to Patterns by Joshua Kerievsky - Pragmatic Programmer by Andy Hunt and Dave Thomas Fundamental Android - Android Programming: The Big Nerd Ranch Guide 3rd Edition - Kotlin in Action by Dmitry Jemerov - Kotlin for Android Developers by Antonio Leiva - BDD in Action by John Ferguson Smart Test