Android Sensor中Gyroscope显示的旋转读书不对

Tody Guo 2011-09-26 04:16:16

各位大侠，
我在使用SDK中的gyroscope代码时，旋转机器，显示旋转的度数不正确。
在旋转机台的时候，还没用旋转到90°，代码显示的度数就已经到90°了。
希望高手能帮忙解决啊？
Sensor.TYPE_GYROSCOPE:



private static final float NS2S = 1.0f / 1000000000.0f;

private float timestamp;     

public void onSensorChanged(SensorEvent event){

         if (timestamp != 0) {

              final float dT = (event.timestamp - timestamp) * NS2S;

              angle[0] += event.values[0] * dT;

              angle[1] += event.values[1] * dT;

              angle[2] += event.values[2] * dT;

          }

          timestamp = event.timestamp;

     }

具体代码如下？

package com.tware.gyrotest;

import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;

public class GyroTestActivity extends Activity implements SensorEventListener {

/** Called when the activity is first created. */
private static final float NS2S = 1.0f / 1000000000.0f;
private float timestamp;
private float[] angle = new float[3];

SensorManager mSensorManager;
private Sensor mGYROSCOPE;
TextView vX;
TextView vY;
TextView vZ;

public GyroTestActivity()
{
angle[0] = 0;
angle[1] = 0;
angle[2] = 0;
timestamp = 0;

}

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

vX = (TextView)findViewById(R.id.v_x);
vY = (TextView)findViewById(R.id.v_y);
vZ = (TextView)findViewById(R.id.v_z);

mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
mGYROSCOPE = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);

}

public void onSensorChanged(SensorEvent event)
{
if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE)
{
return;
}

if (timestamp != 0) {
final float dT = (event.timestamp - timestamp) * NS2S;
angle[0] += event.values[0] * dT * 100;
angle[1] += event.values[1] * dT * 100;
angle[2] += event.values[2] * dT * 100;
}
timestamp = event.timestamp;

vX.setText("X: " + Float.toString(angle[0]));
vY.setText("Y: " + Float.toString(angle[1]));
vZ.setText("Z: " + Float.toString(angle[2]));

}

public void onResume() {
super.onResume();
mSensorManager.registerListener(this, mGYROSCOPE, SensorManager.SENSOR_DELAY_NORMAL);
}

public void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub

}
}

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