We recently released an Android port of an iPhone app. The app relies on the
digital compass for some features. This has been working well on most devices,
but there are a few where the compass is not working. It seems the device is
not feeding us any onSensorChanged() messages after we register to receive them.
I think all the problems are with devices running Android 2.2
They users claim that other apps that make use of the compass work just fine
for them.
We start the compass using:
if ( magnetometer != null && accelerometer != null )
{
if ( compassOn )
{
sensorManager.registerListener( this, accelerometer, (int) (1000000
/ kSensorUpdateFrequencyFast) );
sensorManager.registerListener( this, magnetometer, (int) (1000000
/ kSensorUpdateFrequencyFast) );
}
else
{
sensorManager.registerListener( this, accelerometer, (int) (1000000
/ kSensorUpdateFrequencySlow) );
sensorManager.registerListener( this, magnetometer, (int) (1000000
/ kSensorUpdateFrequencySlow) );
}
}
Where the magnetometer and accelerometer are initialized at program startup
using:
sensorManager = (SensorManager) getSystemService( SENSOR_SERVICE );
accelerometer = sensorManager.getDefaultSensor( Sensor.TYPE_ACCELEROMETER );
magnetometer = sensorManager.getDefaultSensor( Sensor.TYPE_MAGNETIC_FIELD );
We do get a valid (non-null) accelerometer and magnetometer sensors returned
from these calls.
So does anyone have any thoughts on why the compass code might not be working
on those 2.2 devices?
I see that even the Compass example in the example code with the Android SDK
still used the deprecated ORIENTATION sensor for getting compass values. Is
this what should be used on 2.2?
--
Bill Tschumy
Otherwise -- Longmont, CO
http://www.otherwise.com
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