using the Verlet method for indoor geolocation in Android:
hi I wonder why this application does not work even if it contains no
error, I want to integrate the acceleration to find position using
Verlet method here is my code
`package com.test.accelo;
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.view.Display;
import android.view.Surface;
import android.widget.TextView;
public class AccelerometreActivity extends Activity implements
SensorEventListener {
/** Called when the activity is first created. */
private Display mDisplay;
SensorManager sm;
boolean acceltest;
TextView t1,t2,t3;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
sm=(SensorManager) getSystemService(SEARCH_SERVICE);
}@Override
protected void onResume() {
super.onResume();
acceltest=sm.registerListener(this,sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),SensorManager.SENSOR_DELAY_UI);
if(! acceltest){
sm.unregisterListener(this,sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER));
}}
protected void onStop() {
super.onStop();
sm.unregisterListener(this,sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER));
}
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
@SuppressWarnings("null")
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
float x = 50,y=50,z = 50;
final long mSensorTimeStamp = 0;
final long mCpuTimeStamp = 0;
if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
switch (mDisplay.getRotation()) {
case Surface.ROTATION_0:
x = event.values[0];
y = event.values[1];
break;
case Surface.ROTATION_90:
x = -event.values[1];
y = event.values[0];
break;
case Surface.ROTATION_180:
x = -event.values[0];
y = -event.values[1];
break;
case Surface.ROTATION_270:
x = event.values[1];
y = -event.values[0];
break;
}
z = event.values[2];
}
final float alpha = (float) 0.8;
float[] gravity = null;
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];
float[] linear_acceleration = null;
linear_acceleration[0] = event.values[0] - gravity[0];
linear_acceleration[1] = event.values[1] - gravity[1];
linear_acceleration[2] = event.values[2] - gravity[2];
final float sx = linear_acceleration[1];
final float sy = linear_acceleration[2];
float mPosX=0;
float mPosY=0;
float mAccelX = 0;
float mAccelY=0;
float mLastPosX=0;
float mLastPosY=0;
final long dT = mSensorTimeStamp + (System.nanoTime() -
mCpuTimeStamp);
final float dTdT = dT * dT;
final float x1 = 2*(mPosX )- mLastPosX + mAccelX* dTdT;
final float y1 = 2*(mPosY) - mLastPosY + (mAccelY)*dTdT;
mLastPosX = mPosX;
mLastPosY = mPosY;
mPosX = x1;
mPosY = y1;
mAccelX = sx;
mAccelY = sy;
t1=((TextView) findViewById(R.id.textView1));
t1.setText("Axe x"+x+"ms^2"+"\n"+" Axe y"+y+"\n"+"Axez"+z);
t2=(TextView) findViewById(R.id.textView2);
t1.setText("AcclinX"+ linear_acceleration[1]+"ms^2"+"AcclinY"+
linear_acceleration[2]+"ms^2");
t3=(TextView) findViewById(R.id.textView3);
t3.setText("POSX"+ x1+"m"+"POSY"+ y1+"m");
}}
`I do not know what's the probleme.Mon stumbles is to find a position
from the accelerometer, if it please you help me
2012/5/13, Marcin Orlowski <[email protected]>:
> Just a note, that to make this thread useful for others, searching for help
> in future, it's a good habbit to tell where the problem was and how you
> fixed it (if it was not trivial)
>
> Regards,
> Marcin Orlowski
>
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>
>
>
> On 13 May 2012 18:20, Jeresam515 <[email protected]> wrote:
>
>> Thanks all, I have gotten it to work.
>>
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