There has been a few discussions about it, but there is still not a
good solution.
Simple problem - recognize when the device is laying somewhere not
moving (in relation to earth) and when is moving.
Accelerometer seems to be a good sensor to use.
First suprise came to me, when I logged data from the sensor events.
When the device (htc hero) is laying on the table - the values are
changing!
sth. like
-0.7, -0.7, 10.1
-0.6, -0.8, 10.0
and so on - fluctuating
I haven't expected that, but let's go on - I thought I woudl compute
the real force, and went with
private double computeRealForce(SensorEvent event) {
return Math.sqrt(Math.pow(event.values[0], 2)
+ Math.pow(event.values[1], 2)
+ Math.pow(event.values[2], 2))
- SensorManager.GRAVITY_EARTH;
}
very similiar approach as seen in
http://github.com/commonsguy/cw-advandroid/blob/master/Sensor/Shaker/src/com/commonsware/android/sensor/Shaker.java
and similiar in
http://www.anddev.org/example_detecting_-und-quotshake-und-quot_with_the_accelerometer-t4451.html
and the computed value also fluctuates,
0,35
0,39
0,4
but I can apply force treshold like 0,5 as a kind of filter and
everything is ok.
But when I put my phone to stand vertically - suddenly my computed
force turned out to be
-1,01
-1,05
I give up - I don't know what is the good enough solution -
the one that would give around zero value when the device isn't moving
in relation to earth - is there any?
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