accelerometer

I have read articles/tutorial about accessing the phone's accelerometer (acceleration and orientation) values. I am trying to build a simple app where I can move a ball image using the these values. Here is my code: import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.graphics.drawable.ShapeDrawable; import android.graphics.drawable.shapes.OvalShape; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import

Apple annonced Shake API in iPhone SDK 3.0. I can not find any information regarding this new feature. Who knows about how to use it? Any example, link will be good. The APIs you are looking for are in UIResponder : - (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event; - (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event; - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event; Generally you just implement this: - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (event.type == UIEventSubtypeMotionShake) { //Your code

I'm developing an application for my final thesis on computer science, and I need to collect and log accelerometer data. I need to acquire it for a whole day long, so there are serious battery constraints (for instance, I cannot leave the screen on). Also, this isn't a market targeted application, so it is pretty acceptable to do some serious hacking, even low level C/C++ coding, if required. It is well known that on many devices the listeners for accelerometer events stop generating events when screen goes off (some links regarding this problem: http://code.google.com/p/android/issues/detail

I am working on an application where I would like to track the position of a mobile user inside a building where GPS is unavailable. The user starts at a well known fixed location (accurate to within 5 centimeters), at which point the accelerometer in the phone is to be activated to track any further movements with respect to that fixed location. My question is, in current generation smart phones (iphones, android phones, etc), how accurately can one expect to be able to track somebodies position based on the accelerometer these phones generally come equip with? Specific examples would be good