Reactive Programming - Speaker Deck

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Reactive Programming Aung Kyaw Paing

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A little bit about myself • 2 years in Android Development • Have released a couple of apps • Android Dev at Nex • Final year CS student

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What’s Reactive Programming?

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What’s Reactive Programming? Reactive programming is programming with asynchronous data streams. Source : https://gist.github.com/staltz/868e7e9bc2a7b8c1f754

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What’s Reactive Programming? Reactive programming is programming with asynchronous data streams. Source : https://gist.github.com/staltz/868e7e9bc2a7b8c1f754

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Capturing Double Click Step 1 : Capture click events in a stream Step 2 : Group click events within a time period Step 3 : Count the grouped click events in each time period Step 4 : Filter groups that contains 2 or more clicks

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Capturing Double Click Source : https://gist.github.com/staltz/868e7e9bc2a7b8c1f754

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Buffer Bundles data emitted by an observable within a time period and emit this bundle instead of the original data

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Map Transform data emitted by an observable using a function

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Filter Emit data if and only if it passes a test

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Capturing Double Click

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Capturing Double Click

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Meet ReactiveX An API for asynchronous programming with observable streams http://reactivex.io/

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Meet ReactiveX Observable Observer

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Why Rx?

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Why Rx? Source : http://jakewharton.com/exploring-rxjava-2-for-android/

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Why Rx?

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Why Rx?

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Why Rx?

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Why Rx?

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Why Rx?

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Why Rx?

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Why Rx?

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Real World Example • Handling Network and Cache Data • AutoComplete Search

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Handling Network And Cache Data

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MergeDelayError Combine multiple observable of same type into one observable

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Handling Network And Cache Data

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Handling Network And Cache Data

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Handling Network And Cache Data

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Concat Combines multiple observable but respect the order in which the observables are subscribed

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Handling Network And Cache Data

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Publish Makes a observable connectable

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TakeUntil Discard data emitted by a observable after a second observable emits it ﬁrst data or terminates

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Handling Network And Cache Data

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AutoComplete Search

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Debounce Emits only if the observable after a period of time have passed without emitting a data

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Flatmap Transform data emitted from an observable into another observable of different type

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Holy Trinity of RxConversation map R => T flatMap R => Observable compose Observable => Observable

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AutoComplete Search

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AutoComplete Search (flatmap)

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Concatmap Transform data emitted from an observable into another observable of different type but it respects the order

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AutoComplete Search

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AutoComplete Search (concatmap)

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Switchmap Switchmap works like Concatmap but it will immediately unsubscribe to pervious items emitted from the stream as soon as an observable emits an item into the stream

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AutoComplete Search

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AutoComplete Search (switchmap)

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Suggested Links The Introduction to Reactive Programming You’ve been missing https://gist.github.com/staltz/868e7e9bc2a7b8c1f754 Exploring RxJava 2 for Android http://jakewharton.com/exploring-rxjava-2-for-android/ Learning Rx by example Part 1 & 2 https://www.youtube.com/watch?v=k3D0cWyNno4 https://vimeo.com/190922794 Rx-Android-Samples https://github.com/kaushikgopal/RxJava-Android-Samples Rxify Series https://medium.com/@ragdroid

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Question Time