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Android Thread
This document summarizes key aspects of Android threading. It discusses the main UI thread and worker threads, and how they interact using loops, message queues, and handlers. It then overviews common APIs for threading in Android like View.post(), Thread/Runnable, Executor/Runnable, Handler/HandlerThread, AsyncTask, and IntentService. It also touches on potential issues like race conditions and deadlocks. The document concludes with a discussion period for questions.
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Android Thread
- 1. Android Threading Charlie Tsai@ Android Study Group
- 2. Charlie Tsai @Android Study Group cha122977@gmail.com Software Engineer Today’s source code throws new NullPointerException()
- 3. Agenda • Background Knowledge •Android Thread • Free Discussions :P
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- 5. What is Thread? •Process • Process vs Thread • Thread and Process of JVM • Multithreading vs Multi-process • Kernel Task
- 6. Issues of Multithreading •Race condition (Synchronization issue) • Dead lock issue • Interaction of Thread • Hard to testing
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- 8. Android Thread • UIThread (==Main Thread) & Worker Thread • Looper, MessageQueue, and Handler • UI Refreshing • ActivityThread.java • ViewRootImpl.java • Choreographer.java
- 9. Useful APIs • View.post()& runOnUiThread() • Thread & Runnable • Executor & Runnable • Future & Callable • Handler & HanderThread • AsyncTask • IntentService • AsyncLoader
- 10. View.post() & runOnUiThread() • Pros •Easy to use • Make function adaptive • Cons • May cause callback hell
- 11. Thread & Runnable •Pros • Easy to use • Fully control • Cons • Fully control • No return value • Data synchronization issue
- 12. Executor & Runnable •Pros • Easy to use • Avoid too much instances of Thread • Cons • No return value
- 14. Future & Callable •Pros • Easy to use • Have return value • Cons • Get return value may block UI Thread
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- 17. Handler & HandlerThread •Pros • Easy to use • Easy to communication between threads • Cons • Need to implement switch-case of Handler • Limitation of data type
- 19. AsyncTask • Pros • ProgressUpdating • Easy to cancel • onPostExecute run in UI Thread • Cons • Duplicated codes • Hard to trace code
- 21. IntentService • Pros • Easyto use • Not depends on Activity • Cons • No return value • Limitation of data type
- 23. AsyncLoader • Pros • Easyto manager multiple Loaders • Asynchronous • Clear to read • Cons • Need to implement callback interface • Only for Activity & Fragment • Hard to use
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- 25. ResultReceiver • Implement Parcelable •Can be used to return values • Use Bundle to carry the data • Can send data multiple times
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- 29. Enable Multiple Processes •android:process=“:newProcessName” • startService() and/or bindService()
- 30. IPC & RFC •Inter-Process Communication • Remote Function Call (*RemoteException) • ContentProvider & ContentReslover • Bound service + Messenger • Bound service + AIDL
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- 32. Parcel • Why Parcel? •Parcelable • AIDL • Bundle.putParcelable() • Message.obj
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- 34. December 3rd @台灣大學普通教學館
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