Yes, all this has been asked before, and it’s hard now to decide what a duplicate of is, because of so many questions here. Please, use the search box before posting questions, and ask one single question per post. Thanks. Now, to answer your questions: Books: https://stackoverflow.com/questions/1114287/good-book-for-beginning-android-development-closed Best Android 2.0 development book? Sensors: Android Gyroscope … Read more
Add a notifier in the viewWillAppear function -(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil]; } The orientation change notifies this function – (void)orientationChanged:(NSNotification *)notification{ [self adjustViewsForOrientation:[[UIApplication sharedApplication] statusBarOrientation]]; } which in-turn calls this function where the moviePlayerController frame is orientation is handled – (void) adjustViewsForOrientation:(UIInterfaceOrientation) orientation { switch (orientation) { case UIInterfaceOrientationPortrait: case … Read more
No, not really. If you integrate the accelerometer values twice you get position but the error is horrible. It is useless in practice. Here is an explanation why (Google Tech Talk) at 23:20. What you actually could do is to discover your “hidden object” by changing the orientation of the phone. That works pretty well … Read more
Cool, there are people out there struggling with the same problem so it is worth to spent some time 🙂 I agree with westsider’s statement as I spent a few weeks of experimenting with different approaches and ended up with poor results. I am sure that there won’t be an acceptable solution for either larger … Read more
There are currently three distinct events which may or may not be triggered when the client devices moves. Two of them are focused around orientation and the last on motion: ondeviceorientation is known to work on the desktop version of Chrome, and most Apple laptops seems to have the hardware required for this to work. … Read more
Gyros and accelerometers are not enough. You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation by (Google Tech Talk) at 23:20. I highly recommend this video. As for indoor positioning, I have found these useful: RSSI-Based Indoor Localization and Tracking Using … Read more
Basic calculus behind this problem is in the expression (and similar expressions for displacements in y and z) and basic geometry is the Pythagorean theorem So, once you have your accelerometer signals passed through a low-pass filter and binned in time with sampling interval dt, you can find the displacement in x as (pardon my … Read more