Here is my damper.
HOWEVER: IT DOES NOT SOLVE THIS PROBLEM.
I am going to set the damping windows size to 3 or 4,
however i will disable sound because gameplay is practically
impossible with sounds on.
So Google Developers: What is causing this problem,
and how is it solved.???
Here my sensor damper:
package com.tjerk.util;
/**
* Class that adapts the sensor output values
* by damping them over an window of previous sensor values.
*
* The new sensor values are the average over all sensor values
* in the window.
*
* This class can be used as a workaround for the
* accelerometer sensor+sound bug in Android.
*
* A biger window means less fluctuation in the sensor values.
* However a side-effect of a large window is that it takes
* there is a delay in movement detection.
*
* @author Tjerk Wolterink
* @date June 9, 2009
*/
public class SensorAverageDamper {
private float[] window0;
private float[] window1;
private float[] window2;
private int i;
private int windowSize;
/**
* Creates an sensor damper with a specific window size.
*
* @param windowSize the of the average window
*/
public SensorAverageDamper(int windowSize) {
this(windowSize, true, true, true);
}
/**
* Creates a new damper with a specific window size.
*
* @param windowSize the of the average window
* @param damp0 wether to damp sensor value values[0]
* @param damp1 wether to damp sensor value values[1]
* @param damp1 wether to damp sensor value values[1]
*/
public SensorAverageDamper(int windowSize, boolean damp0, boolean
damp1, boolean damp2) {
this.windowSize=windowSize;
if(damp0) window0=createWindow();
if(damp1) window1=createWindow();
if(damp2) window2=createWindow();
}
protected float[] createWindow() {
float[] w=new float[windowSize];
for(int i=0;i<w.length;i++) w[i]=-1;
return w;
}
protected float average(float[] w) {
int l=0;
int j=i;
float sum=0;
while(true) {
if(w[j]!=-1) {
l++;
sum+=w[j];
}
j=(j+1)%w.length;
if(j==i) break;
}
return sum/l;
}
/**
* Adds the values to the window and
* returns the damped values (average in the window)
* @param values
* @return
*/
public float[] damp(float[] values) {
i=(i+1)%windowSize;
if(window0!=null) {
window0[i]=values[0];
values[0]=average(window0);
}
if(window1!=null) {
window1[i]=values[1];
values[1]=average(window1);
}
if(window2!=null) {
window2[i]=values[2];
values[2]=average(window2);
}
return values;
}
}
On 9 jun, 20:08, TjerkW <tje...@gmail.com> wrote:
> I am developing a game.
> In which the user controls movement using the accelerometer.
> Sounds effects can also be enabled.
>
> However when laying the phone flat down and playing the game without
> the accelerometer gives nice 0,0,0 values.
>
> However when play WITH SOUNDS on, i get a buch of weird values: while
> the phone is NOT moving.
>
> This is really a big bug that makes life hard for Game Developers.
> I tried to take an avarge of the last 5 values from the sensor.. but
> this is not enough..
>
> The harder the sounds plays: the higher the weird sensor values.
>
> When using the headphones: almost no weird values.
>
> Seems that sounds interferes with the accelerometer sensor.
>
> BTW: more developers posted this issue but no reactions at all from
> google!!http://groups.google.com/group/android-developers/browse_thread/threa...http://groups.google.com/group/android-developers/browse_thread/threa...
>
> Is this is hardware problem?
> How do i solve it?
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