Android - Sensor Manager
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Android - Sensor Manager
![Android –
Sensor Manager
Yong Heui Cho @ Mokwon University
Some of slides are referred to:
[1] Nitin Ramchandani, Android OS, slideshare.](https://image.slidesharecdn.com/12-160227043716/85/android-sensor-manager-1-320.jpg)
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Android - Sensor Manager
- 1. Android – Sensor Manager Yong Heui Cho @ Mokwon University Some of slides are referred to: [1] Nitin Ramchandani, Android OS, slideshare.
- 2. 2 Smart Device M2M 10. Arduino+Android - BT+IoTN 11. Arduino - Pressure Sensor 12. Android – Sensor Message 13. BT+IoTN Project - Concept
- 5. 5 Lifecycle Comparison Run Terminate onCreate() onDestroy() onStart() onStop() onResume() onPause() onRestart() - onRestoreInstanceState() onSaveInstanceState()
- 7. 7 Android vs. Windows type Android Windows CPU optimal fast battery small power supply memory mobile DRAM small DRAM large message handler message (Message) or action (String) message (int) termination app lifecycle permanent function call call & proceed call & wait or call & proceed
- 9. 9 Android Msg Handler • Message: containing a description and arbitrary data object • Runnable: a command that can be executed • Handler: allows you to send and process Message and Runnable • Looper: used to run a message loop for a thread
- 11. 11 Android Rules • Do not block the UI thread (or main thread). • Do not access the Android UI toolkit from outside the UI thread.
- 12. 12 Event Listener • Interface to process specific events
- 13. 13 PhoneStateListner • Monitors changes in specific telephony states on the device, including service state, signal strength, message waiting indicator (voicemail). Activity Context PhoneStateListener OS TelephonyManager listen()
- 14. 14 Broadcast Receiver • An Intent-based publish- subscribe mechanism. • Great for listening system events such as SMS messages. □ Courtesy to Everything of Android, slideshare.
- 15. 15 BR vs. Listener type BroadcastReceiver Listener goal class for Intents class or interface for Intents & others message mostly global messages mostly specific messages period discontinuous reception frequent (or continuous) reception construction static (manifest) or dynamic dynamic only
- 17. 17 Sensor Manager • SensorManager Context.getSystemService(SENSOR_SERVICE ) • Sensor SensorManager.getDefaultSensor(Sensor.TYPE _XXX) • SensorManager.registerListener(SEL, Sensor, int samplingPeriodUs) • SensorManager.unregisterListener(SEL)