透過 GCM 實作跨裝置資料同步

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Rogery! Android Team Leader! 透過 GCM 實作跨裝置資料同步 @Android Taipei

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•  關於 Rogery & KKBOX Android Team •  Concept & Idea •  Implement •  Demo •  Q & A Agenda

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•  從 Android 1.0 開始研發 KKBOX Android，開發經驗至今已四年以上 •  在 KKBOX 擔任 Android Team Leader •  熱愛音樂創作的工程師 http://youtu.be/IwsNKobAkS0 關於 Rogery

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•  產品：KKBOX Android, KKBOX Music Store, UtaPass •  裝置：Handset, Tablet, STB 和車機 •  團隊人數從 1 人到 11 人關於 KKBOX Android Team

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Concept & Idea

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GCM （Google Cloud Message） •  幫助開發者發送推播訊息到各個 Android 裝置 •  首次在 Google IO 2012 亮相 •  前身是 C2DM (Cloud to Device Messaging)

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KKBOX use GCM •  Push NoPﬁcaPon: 推播跟隨的臺長已經上線訊息 •  只用在訊息通知

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Concept & Idea 直到我看見…

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Google IO 2013 – StopWatch Demo

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Concept & Idea 怎麼能那麼即時同步？

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Concept & Idea Think: KKBOX 能用在哪裡？

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Concept & Idea 歌單立即同步?!

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Polling vs Pushing •  Polling: 每個裝置定期去向 Server 問目前最新的狀態 •  目前 KKBOX 實作歌單同步的方式 •  容易實作 •  耗電：手機一直送連線、Server 一直收連線

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Polling vs Pushing •  Pushing: 當 Server 有狀態更新時去通知裝置 •  省電：連線數降低、Server Loading 降低

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Implement

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POC KKGCMSyncServer (Google App Engine) KKGCMSyncClient

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Registration (1) (2) (3) 1.  register GCM -‐ ref.1 2.  return GCM registraPon ID - ref.1 ref.2 3.  put registracPon ID to server -‐ ref.3

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Push & Sync (2) (3) (1) 1.  push change to server -‐ ref.1 ref.2 2.  send sync message to GCM -‐ ref.3 3.  client receive sync message from GCM -‐ ref.4 4.  pull change from server -‐ ref.5 5.  return change to client -‐ ref.6 (4) (5)

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Demo 1 POC: GCMSyncList

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Demo 2 KKBOX GCM Sync

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Demo Source •  KKGCMSyncServer – GitHub - https://github.com/rogery/KKGCMSyncServer •  KKGCMSyncClient – GtiHub - https://github.com/rogery/KKGCMSyncClient

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References •  C2DM - https://developers.google.com/android/c2dm/ •  GeYng Started with GCM – Android Developer -‐ http://developer.android.com/google/gcm/gs.html •  Google Cloud Messaging for Android – Google I/O 2012 -‐ https://developers.google.com/events/io/2012/sessions/gooio2012/100/ •  StopWatch Demo – Google I/O 2013 -‐ http://bradabrams.com/2013/06/google-io-2013-demo-android-studio- cloud-endpoints-synchronized-stopwatch-demo/