sensor - Get Forward, Backward left right sesnor android -

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i have small project, in need detect movement of device ex: have mobile held on table if move device left "like moving pc mouse", need know if move right, need know if move forward, , backward need know

i searched , used many tutorials, tutorials gave me numbers changes lot when device not moved!! tried this

 if (event.sensor.gettype() == sensor.type_accelerometer){             mgravity = event.values.clone();             // shake detection             float x = mgravity[0];             float y = mgravity[1];             float z = mgravity[2];             maccellast = maccelcurrent;             maccelcurrent = (float)math.sqrt(x * x + y * y + z * z);             float delta = maccelcurrent - maccellast;             maccel = maccel * 0.9f + delta;             // make higher or lower according how             // motion want detect             if(maccel > 0.0005){                 ((textview)findviewbyid(r.id.xfield)).settext("x:" + string.valueof((x)));                 ((textview)findviewbyid(r.id.yfield)).settext("y:" + string.valueof((y)));                 ((textview)findviewbyid(r.id.zfield)).settext("z:" + string.valueof(z));             }         }

thanks

from android documentation:

measures acceleration force in m/s2 applied device on 3 physical axes (x, y, , z), including force of gravity.

i.e.accelerometer detects acceleration, not movement, not speed , not direction. in nutshell: if movement @ constant speed accelerometer show 0. need write algorithm parse speed and/or direction acceleration. involves lot of study physics , mathematics. in nutshell: integral of acceleration speed, second integral of acceleration direction. (of course more complex, give direction of start exploring).


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