var lastx,lasty,lastz,lastms
 
function OnStart(){
var lay = app.CreateLayout( "Linear", "VCenter,FillXY" );
var txt = app.CreateText( "Shake test" );  
lay.AddChild( txt );
app.AddLayout( lay );
var sns = app.CreateSensor("Accelerometer" );
sns.SetOnChange( sns_OnChange );  sns.Start();
}
 function sns_OnChange( x, y, z, time ){
 try  {
var diffms,speed;
 if(lastx!==undefined)     {
diffms=time-lastms;
speed = Math.abs(x y z-lastx-lasty-lastz) / diffms * 10000;
 if(speed>800) OnShake(speed/800); 
}
lastx=x;     lasty=y;     lastz=z;     lastms=time;
}
 catch(e) {}
} 
function OnShake(speed){
var msg = "Shake\n" speed.toFixed(2);  
app.ScreenShot("mnt/sdcard/test.png",90);
 app.ShowPopup(msg,"Short");
 
}