1. Android
Sensors
Jussi
Pohjolainen

2. Overview
• SensorManager:
Access
to
sensors
if
hardware
supports
• SensorEventListener:
Interface
for
class
to
listen
sensor
values
as
they
change
in
=me

3. SensorManager
• Access
to
device’s
sensors
• Reference
by
calling
getSystemService
• Disable
sensors
if
you
don’t
need
them!
(drain
baEery)

4. Sensor
Type
• Accelerometer,
Orienta=on
• Light
• Magne=c
field
• Proximity
• Temperature
• …

5. Sampling
Rate
• How
fast
try
to
get
the
sensor
data
• Reques=ng
specific
sampling
rate..
Hint
to
the
system,
no
guarantees
• SensorManager
holds
constant
variables:
– Fastest
– Game
– Normal
– User
Interface

6. Accuracy
• How
accurate
is
the
informa=on?
– High
– Low
– Medium
– Unreliable
• This
is
informa=on
is
sent
to
listener

7. SensorManager
Example
public class SensorActivity extends Activity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mAccelerometer;
public SensorActivity() {
mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
}
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
mSensorManager.unregisteredListener(this);
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
public void onSensorChanged(SensorEvent event) {
}
}

8. Sensor
Simulator
• The
current
Android
emulator
does
not
support
sensors
• Use
Sensor
Simulator,
open
source
project
developed
by
Open
Intents
• Supports
accelerometer,
compass,
orienta=on,
and
temperature
sensors,
• Download
it
from:
– hEp://code.google.com/p/openintents/wiki/
SensorSimulator

9. Instruc=ons
1. Download
the
latest
sensorsimulator-
x.x.x.zip from
the
download
tab
and
unzip.
2. Start
bin/sensorsimulator-x.x.x.jar (Java
standalone
applica=on).
1. java –jar sensorsimulator-x.x.x.jar
3. Install
bin/SensorSimulatorSettings-
x.x.x.apk on
your
Android
emulator.
4. Launch
SensorSimulator
on
the
emulator.
5. Enter
IP
address
and
socket
(port)
number
into
the
emulator

10. 2.
Start
the
Sensor
Simulator
Jar

11. 3.
Install
Sensor
Simulator
Apk

12. 4.
Launch
Sensor
Simulator
in
Emulator

13. 5.
Configure
App

14. 6.
Enable
Connec=on

16. Using
Sensor
Simulator
in
Your
App
• Add
external
JAR
lib/sensorsimulator-
lib.x.x.x.jar
to
your
project
• Use
sensorsimulator
classes
• Get
reference
to
SensorManagerSimulator
instead
of
SensorManager
• Connect
to
simulator
• Add
permission
to
use
internet

17. Add
.jar
to
Project