Rajab Davudov - Android Sensors

1. Rajab Davudov

2. Introduction
Most Android devices are powered with
built-in sensors of high accuracy.
• Motion Sensors
• Environmental Sensors
• Position Sensors

3. Motion Sensors
These sensors measure acceleration forces
and rotational forces along three axes.
This category includes
• accelerometers
• gravity sensors
• gyroscopes
• …

4. Environmental Sensors
These sensors measure various
environmental parameters:
• temperature
• pressure
• illumination
• humidity

5. Position Sensors
These sensors measure the physical
position of a device. This category includes:
• orientation sensors
• magnetometers
• proximity

6. Sensor Table
Android 4.0 Android 2.3 Android 2.2 Android 1.5
Sensor
(API Level 14) (API Level 9) (API Level 8) (API Level 3)
TYPE_ACCELEROMETER Yes Yes Yes Yes
TYPE_AMBIENT_TEMPERATURE Yes n/a n/a n/a
TYPE_GRAVITY Yes Yes n/a n/a
TYPE_GYROSCOPE Yes Yes n/a1 n/a1
TYPE_LIGHT Yes Yes Yes Yes
TYPE_LINEAR_ACCELERATION Yes Yes n/a n/a
TYPE_MAGNETIC_FIELD Yes Yes Yes Yes
TYPE_ORIENTATION Yes2 Yes2 Yes2 Yes
TYPE_PRESSURE Yes Yes n/a1 n/a1
TYPE_PROXIMITY Yes Yes Yes Yes
TYPE_RELATIVE_HUMIDITY Yes n/a n/a n/a
TYPE_ROTATION_VECTOR Yes Yes n/a n/a
TYPE_TEMPERATURE Yes2 Yes Yes Yes

7. android.hardware
• Sensor
• SensorEvent
• SensorListener
• SensorManager

8. SensorManager
SensorManager mSensorManager = (SensorManager)
getSystemService(Context.SENSOR_SERVICE);
List<Sensor> deviceSensors =
mSensorManager.getSensorList(Sensor.TYPE_ALL);

9. SensorListener
onAccuracyChanged()
new accuracy of the sensor.
onSensorChanged()
new data from the sensor

10. SensorListener
onAccuracyChanged()
new accuracy of the sensor.
onSensorChanged()
new data from the sensor

11. Tips
• Unregister sensors listeners
• Don’t block onSensorChanged()
• Verify sensors before using them
• Choose sensor delays carefully

12. Ready, Steady, Code !!!

13. Rajab Davudov
Senior Developer at Azerfon
radjab@gmail.com
https://market.android.com/developer?pub=RADJAB
http://gplus.to/radjab
http://www.fb.me/rajab.davudov
http://www.linkedin.com/in/radjab
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