Hello,
I've been doing some testing on the accelerometer, specifically with
the old SensorListener and new SensorEventListener versions available
as of Cupcake.
Using SensorListener, I've been getting normal acceleration values as
expected according to the documentation - around 9.8 on the axis in
line with gravity when sitting still. When I upgraded the code to
SensorEventListener, that number jumped to around 30, which is not
consistent with the documentation. I've tried sampling at different
rates, but generally I've been using game mode, since that's the rate
I ultimately intend to use.
I'd be interested to hear if anyone has seen this behavior, has any
ideas about it, or sees an issue with the code below. Give it a test
run yourself. It might be relevant to note that the
SensorEvent.accuracy is SENSOR_STATUS_ACCURACY_HIGH.
When I run this code with the phone sitting flat on a table, screen,
up, I get values like these:
x: 12.5625 y: 20.8125 z: -16.4375
////////////////////////////////////////////////////////////////////
package edu.accel;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
public class AccelTest extends Activity {
private SensorManager mSensorManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Set up the accelerometer reading
mSensorManager = (SensorManager)getSystemService
(Context.SENSOR_SERVICE);
// Get the list of all sensors, and find the accelerometer
within
List<Sensor> sensorList = mSensorManager.getSensorList
(SensorManager.SENSOR_ACCELEROMETER);
mSensorManager.registerListener(mSensorListener,
sensorList.get(0),
SensorManager.SENSOR_DELAY_UI);
}
//Accelerometer
private final SensorEventListener mSensorListener = new
SensorEventListener() {
private PrintWriter mCurrentFile;
boolean never = true;
String comma = new String(",");
public void runOnce()
{
//Creating a file to print the data into
String nameStr = new String("/sdcard/10 second trials.xls");
File outputFile = new File(nameStr);
mCurrentFile = null;
try {
mCurrentFile = new PrintWriter(new
FileOutputStream(outputFile));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
if (never)
{
never = false;
runOnce();
}
StringBuffer buff = new StringBuffer();
buff.append(String.valueOf(event.values[0]));
buff.append(comma);
buff.append(String.valueOf(event.values[1]));
buff.append(comma);
buff.append(String.valueOf(event.values[2]));
mCurrentFile.println(buff.toString());
}
};
}
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