Query the accelerometer when the application is in the background

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Import the following classes:
- net.rim.device.api.system.AccelerometerChannelConfig;
- net.rim.device.api.system.AccelerometerSensor.Channel;

Create a configuration for a channel to the accelerometer.

AccelerometerChannelConfig channelConfig = new AccelerometerChannelConfig( AccelerometerChannelConfig.TYPE_RAW );

Invoke AccelerometerChannelConfig.setBackgroundMode(Boolean), to specify support for an application that is in the background.
```
channelConfig.setBackgroundMode( true );
```

Invoke AccelerometerSensor.openChannel(), to open a background channel to the accelerometer.

Channel channel = AccelerometerSensor.openChannel( Application.getApplication(), channelConfig );

Invoke Thread.sleep() to specify the interval between queries to the accelerometer, in milliseconds.

short[] xyz = new short[ 3 ];
  while( running ) {
       channel.getLastAccelerationData( xyz );
       Thread.sleep( 500 );
}

Invoke Channel.close() to close the channel to the accelerometer.
```
channel.close();
```

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