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how to sample the current correct device attitude


how to sample the current correct device attitude

By : user2948004
Date : November 14 2020, 04:48 PM
it helps some times it turns out that without giving a reference it delivers almost correct values. the values contain noises which i have filtered with ±2 degree.
code :
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.deviceMotionUpdateInterval = 1.0/60.0;

[self.motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMDeviceMotion *motion, NSError *error) {
    if (error == nil)
    {
         startattitude = self.motionManager.deviceMotion.attitude;
    }
}];


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iPhone device attitude changes constantly

iPhone device attitude changes constantly


By : Sara
Date : March 29 2020, 07:55 AM
it helps some times Apparently drifting of the gyro reference frame is a common issue and this is because it computes current attitude by aggregating rotation rates around axes over time
How to understand initial reference frame of iOS 8 device attitude?

How to understand initial reference frame of iOS 8 device attitude?


By : STS
Date : March 29 2020, 07:55 AM
may help you . You use the reference frame CMAttitudeReferenceFrameXArbitraryZVertical when you are interested in deviation from the initial position. In a reference frame of CMAttitudeReferenceFrameXArbitraryZVertical, the first attitude reported establishes the initial frame of reference. This means that its value is essentially arbitrary. You should ignore its value, but at the same time it is up to you to save this initial attitude and subsequently always to call multiplyByInverseOfAttitude: on any new attitudes, passing the saved attitude as parameter. This gives you information relative to the initial position.
How can I get correct current date and time for android device while device is offline

How can I get correct current date and time for android device while device is offline


By : Delyan Atanasov
Date : March 29 2020, 07:55 AM
wish helps you So I end up with this scenario, With this scenario user most connect to internet just once per every device reboot.
I try to connect to a NTP server when user boots (BOOT_COMPLETED BroadcastReceiver) or Network states changed (CONNECTIVITY_CHANGE and WIFI_STATE_CHANGED BroadcastReceiver) and then I store that date and SystemClock.elapsedRealtime() in the database. After that when ever I want to have the correct date, I just get new SystemClock.elapsedRealtime() and calculate the difference of this value and the elapsedRealtime value from database and add that difference to date that I store in database.
Using window.Touch to find out if current device is a mobile device

Using window.Touch to find out if current device is a mobile device


By : Rich
Date : March 29 2020, 07:55 AM
will help you Is it okay to do the following to determine if you are on mobile device? , This is what I do and so far it has worked pretty well:
Device Admin API sample: works fine on emulator NoSuchMethod error on Device

Device Admin API sample: works fine on emulator NoSuchMethod error on Device


By : Jesus RC
Date : March 29 2020, 07:55 AM
Does that help Although some of the Device Admin API was added earlier, the specific method getKeyguardDisabledFeatures() was only added in API 17, ie android Android 4.2 or JELLY_BEAN_MR1 and about the most recent version released as of this writting.
Therefore you will not be able to use that approach on your ICS test device, or many of those which users have in their hands as of May 2013.
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