Retrieve accelerometer readings from a buffer

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

Query the buffer for accelerometer data.

AccelerometerData accData = bufferedChannel.getAccelerometerData();

Invoke AccelerometerData.getNewBatchLength(), to get the number of readings retrieved since the last query.
```
int newBatchSize = accData.getNewBatchLength();
```
Invoke AccelerometerData.getXAccHistory(), AccelerometerData.getYAccHistory(), and AccelerometerData.getZAccHistory() to retrieve accelerometer data from the buffer for each axis.
```
short[] xAccel = accData.getXAccHistory();
short[] yAccel = accData.getYAccHistory();
short[] zAccel = accData.getZAccHistory();
```

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