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Bài giảng Lập trình cho thiết bị di động - Chương 3: Thao tác với thiết bị cảm ứng - Trần Duy Thanh

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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
2. Monitoring  
the Battery  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
The emulator does not provide any sensor data. All sensor  
testing must be done on a physical device. Alternatively,  
OpenIntents.org also provides a handy Sensor Simulator:  
http://code.google.com/p/openintents/wiki/SensorSimulator  
This tool simulates accelerometer, compass, and  
temperature sensors, and it transmits data to the emulator.  
Android devices have a variety of sensors :  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
TYPE_ACCELEROMETER: Measures acceleration in three  
directions; values are in SI units (m/s2).  
TYPE_GYROSCOPE: Measures angular orientation in three  
directions; values are angles in degrees.  
TYPE_LIGHT: Measures ambient light; values are in SI lux  
units.  
TYPE_MAGNETIC_FIELD: Measures magnetism in three  
directions; the compass values are in micro-Tesla (uT).  
TYPE_PRESSURE: Measures barometric pressure.  
TYPE_PROXIMITY: Measures the distance to an object;  
values are in centimeters, or “near” versus “far.”  
TYPE_RELATIVE_HUMIDITY: Measures the relative humidity.  
TYPE_AMBIENT_TEMPERATURE: Measures temperature.  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢Here are the major classes related to sensor.  
Class  
Comment  
Class representing a sensor. Use getSensorList(int)  
to get the list of available Sensors.  
Sensor  
This class represents a Sensor event and holds  
informations such as the sensor's type, the time-  
stamp, accuracy and of course the sensor's data.  
SensorEvent  
SensorEventListener  
An interface: Used for receiving notifications from  
the SensorManager when sensor values have  
changed.  
SensorManager SensorManager lets you access the device's  
sensors. Get an instance of this class by calling  
Context.getSystemService() with the argument  
SENSOR_SERVICE.  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
✓ To get a Sensor, you need to use SensorManager.  
➢ Working with Sensor  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
✓ Register EventListener to it.  
➢ Working with Sensor  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Working with Sensor  
✓ UnRegister EventListener.  
Register in the onResume method and  
Unregister in the onPause method  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ SensorManager.SENSOR_DELAY  
Frequence  
Comment  
SENSOR_DELAY_FASTEST  
get sensor data as fast as  
possible  
SENSOR_DELAY_NORMAL  
rate (default) suitable for screen  
orientation changes  
SENSOR_DELAY_GAME  
SENSOR_DELAY_UI  
rate suitable for games  
rate suitable for the user  
interface  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Receive SensorEvent  
Normally, onSensorChanged is the method in which  
we need to put your sensor handle logic.  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ SensorEvent  
Type  
Name  
Comment  
public int accuracy The accuracy of this event.  
public Sensor sensor  
The sensor that generated this  
event.  
public long timestamp The time in nanosecond at which  
the event happened  
public final float[] values  
The length and contents of  
the values array depends on  
which sensor type is being  
monitored.  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_TEMPERATURE  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_TEMPERATURE  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_LIGHT  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_LIGHT  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_PRESSURE  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_PRESSURE  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor. TYPE_PROXIMITY  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor. TYPE_PROXIMITY  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor. TYPE_PROXIMITY  
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DONG NAI UNIVERSITY OF TECHNOLOGY  
1. Sensors  
➢ Sensor.TYPE_ACCELEROMETER  
The accelerometer values are represented in SI units  
(m/s2). The device at right has the bottom of the device  
screen pointing toward the center of gravity. Gravity on  
Earth is 9.80665 m/s2.  
All values are in SI units (m/s2)  
values[0]: Acceleration minus Gx on  
the x-axis  
values[1]: Acceleration minus Gy on  
the y-axis  
values[2]: Acceleration minus Gz on  
the z-axis  
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