Sensors Overview _ Android Developers

7/24/2019 Sensors Overview _ Android Developers

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Sensor

SensorEvent

SensorManager

SensorEventListener

sors Overview | Android Developers http://developer.android.com/guide/topics/sensors/sensors_overview.html

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TYPE_ACCELEROMETER

TYPE_AMBIENT_TEMPERATURE

TYPE_GRAVITY

TYPE_GYROSCOPE

TYPE_LIGHT

TYPE_LINEAR_ACCELERATION


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TYPE_MAGNETIC_FIELD

TYPE_ORIENTATION

getRotationMatrix()

TYPE_PRESSURE

TYPE_PROXIMITY

TYPE_RELATIVE_HUMIDITY

TYPE_ROTATION_VECTOR

TYPE_TEMPERATURE


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android.hardware

SensorManager

Sensor

SensorEvent

SensorEventListener


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TYPE_ACCELEROMETER



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TYPE_GRAVITY

TYPE_GYROSCOPE

TYPE_LIGHT

TYPE_LINEAR_ACCELERATION

TYPE_MAGNETIC_FIELD

TYPE_ORIENTATION

TYPE_PRESSURE

TYPE_PROXIMITY

TYPE_RELATIVE_HUMIDITY

TYPE_ROTATION_VECTOR

TYPE_TEMPERATURE

SensorManager

getSystemService()

SENSOR_SERVICE

private SensorManager mSensorManager;

...

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_S

getSensorList() TYPE_ALL

List<Sensor> deviceSensors = mSensorManager.getSensorList(Sensor.T


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TYPE_ALL TYPE_GYROSCOPE

TYPE_LINEAR_ACCELERATION TYPE_GRAVITY

getDefaultSensor()


...


if (mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) !=

// Success! There's a magnetometer.

}

else {

// Failure! No magnetometer.

}

Sensor

getResolution()

getMaximumRange()

getPower()

getVendor() getVersion()


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private Sensor mSensor;

...


if (mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY) != null){List<Sensor> gravSensors = mSensorManager.getSensorList(Sensor.T

for(int i=0; i<gravSensors.size(); i++) {

if ((gravSensors.get(i).getVendor().contains("Google Inc.")) &

(gravSensors.get(i).getVersion() == 3)){

// Use the version 3 gravity sensor.

mSensor = gravSensors.get(i);

}

}

}

else{

// Use the accelerometer.if (mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) !

mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELERO

}

else{

// Sorry, there are no accelerometers on your device.

// You can't play this game.

}

}

getMinDelay()

getMinDelay()

getMinDelay()

getMinDelay()


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SensorEventListener

onAccuracyChanged() onSensorChanged()

onAccuracyChanged()

Sensor

SENSOR_STATUS_ACCURACY_LOW

SENSOR_STATUS_ACCURACY_MEDIUM SENSOR_STATUS_ACCURACY_HIGH

SENSOR_STATUS_UNRELIABLE

onSensorChanged()

SensorEvent SensorEvent

onSensorChanged()

TextView sensor_data

public class SensorActivity extends Activity implements SensorEven


private Sensor mLight;

@Override

public final void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mSensorManager = (SensorManager) getSystemService(Context.SENS

mLight = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);

}

@Override

public final void onAccuracyChanged(Sensor sensor, int accuracy)

// Do something here if sensor accuracy changes.

}

@Overridepublic final void onSensorChanged(SensorEvent event) {

// The light sensor returns a single value.

// Many sensors return 3 values, one for each axis.


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float lux = event.values[0];

// Do something with this sensor value.

}

@Override

protected void onResume() {

super.onResume();

mSensorManager.registerListener(this, mLight, SensorManager.SE

}

@Override

protected void onPause() {

super.onPause();

mSensorManager.unregisterListener(this);

}

}

SENSOR_DELAY_NORMAL

registerListener()

onSensorChanged()

SENSOR_DELAY_GAME SENSOR_DELAY_UI

SENSOR_DELAY_FASTEST

onResume()

onPause()


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...

mSensorManager = (SensorManager) getSystemService(Context.SENSOR

if (mSensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE) != nul

// Success! There's a pressure sensor.

}

else {// Failure! No pressure sensor.

}


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<uses-

feature>

<uses-feature>

<uses-feature android:name="android.hardware.sensor.accelerometer"

android:required="true" />

android:required="true"

<uses-feature>

android:required="false"


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getRotation()

remapCoordinateSystem()

getOrientation() getRotationMatrix()


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onPause()


...

@Override

protected void onPause() {

super.onPause();

mSensorManager.unregisterListener(this);

}

unregisterListener(SensorEventListener)

onSensorChanged(SensorEvent)



TYPE_ORIENTATION

getOrientation()

TYPE_TEMPERATURE



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registerListener()

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Sensors Overview _ Android Developers