我是安卓开发新手。我想获得手机的实际加速度。我找到了一个获得加速度的代码。但它给出了重力加速度。请任何人帮助我找到一种在没有重力的情况下获得实际加速度的方法。
这是我找到的代码,请帮我解决这个代码。谢谢
package com.SensorTest;
import android.app.Activity;
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 SensorTestActivity extends Activity implements SensorEventListener {
SensorManager sensorManager = null;
//for accelerometer values
TextView outputX;
TextView outputY;
TextView outputZ;
//for orientation values
TextView outputX2;
TextView outputY2;
TextView outputZ2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
setContentView(R.layout.main);
//just some textviews, for data output
outputX = (TextView) findViewById(R.id.TextView01);
outputY = (TextView) findViewById(R.id.TextView02);
outputZ = (TextView) findViewById(R.id.TextView03);
outputX2 = (TextView) findViewById(R.id.TextView04);
outputY2 = (TextView) findViewById(R.id.TextView05);
outputZ2 = (TextView) findViewById(R.id.TextView06);
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
@Override
public void onSensorChanged(SensorEvent event) {
synchronized (this) {
switch (event.sensor.getType()){
case Sensor.TYPE_ACCELEROMETER:
outputX.setText("acclaration x:"+Float.toString(event.values[0]));
outputY.setText("acclaration y:"+Float.toString(event.values[1]));
outputZ.setText("acclaration z:"+Float.toString(event.values[2]));
break;
case Sensor.TYPE_ORIENTATION:
outputX2.setText("orientation x:"+Float.toString(event.values[0]));
outputY2.setText("orientation y:"+Float.toString(event.values[1]));
outputZ2.setText("orientation z:"+Float.toString(event.values[2]));
break;
}
}
}
@Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), sensorManager.SENSOR_DELAY_GAME);
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), sensorManager.SENSOR_DELAY_GAME);
}
}
在没有重力的情况下无法直接获得加速度。
您可以使用高通滤波器,例如Android 参考页面 http://developer.android.com/reference/android/hardware/SensorEvent.html#values, 在里面Sensor.TYPE_ACCELEROMETER
部分:
public void onSensorChanged(SensorEvent event) {
// alpha is calculated as t / (t + dT)
// with t, the low-pass filter's time-constant
// and dT, the event delivery rate
final float alpha = 0.8;
gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];
linear_acceleration[0] = event.values[0] - gravity[0];
linear_acceleration[1] = event.values[1] - gravity[1];
linear_acceleration[2] = event.values[2] - gravity[2];
}
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)