Android :: Is It Possible To Get Sensor Data At Regular Intervals?
Aug 2, 2010
Just joined the Android group. I'm having problems with the acceleration and orientation sensors.I would like to obtain sensor data (acceleration and orientation values) at regular intervals (10 milliseconds). However, the SensorEventListener doesn't allow you to do that. Does anyone have an idea of how to work around this issue? This is important as I need it to collect data for an app I'm working on.
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Oct 8, 2010
Looking for an app to turn on data only at regularly scheduled intervals, say every 15 minutes or so.Anything out there? I know juicedefender may do this but I've heard mixed reviews on it.
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Sep 14, 2010
since map overlay is not activity, how do i get the sensor data so that i can draw on the map overlay? like the direction arrow.
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Jul 22, 2009
Am researching a problem with compass and sensor values returned by the phone. I found this thread: http://groups.google.com/group/android-developers/browse_thread/threa. Which seems related, but it's old so I'm starting a new one. I'm getting stuck values from both the compass and orientation sensors. It was fine yesterday, but today, I'm only getting values in a limited range (e.g. compass headings from 240 - 290), no matter how I orient the device. What's even more odd is that the radians returned from the call to Sensor Manager.get Orientation(), which returns radians, is giving consistently out of range values. Anyone see this same behavior, and if so, any fixes? Here's some sample sensor data. Format is heading, pitch, roll. The first set contains raw values, the second set contains values after I've applied the orientation matrix generated by the Sensor Manager. The third set contains values after I've smoothed the data with my own algorithm.
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Jun 3, 2010
Per the current implementation in Sensor Manager, the SensorThread is polling data per below code, final int sensor = sensors_data_poll(values, status, timestamp); it then checks the sensor type if it is registered and processes the data further. For an application which has registered for only one sensor, still to get that particular sensor data, SensorThread has to execute for atleast N-1 loop most of the time. Can anybody provide the insight as to, why SensorThread is waiting to check the sensor type to be returned by the HAL instead of sending sensor information which is currently registered by that application. Wouldn't that increase the performance?
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Mar 9, 2010
I am working on a project using HTC magic which requires the data from the electronic compass, including both the accelerometer and magnetic sensor. But I find that there is a significant latency between the move of the phone and the trigger of the sensorChanged event. In other word, the acceleration and magnetic data obtained from sensor are updated about half of a second after my motion. And I have several questions about the problem as follow. Are the orientation data computed by the acceleration and magnetic data? Or are there a physical sensor for orientation? Does the latency result from the android API (using the event) or the physical limitation of the electronic compass? It is said that the model of the electronic compass is AK8976A from Asahi Kasei. Does anybody have the datasheet or know the frequency of the sampling? Any idea to improve the real-time experience?
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Feb 16, 2010
I would like to continuously send/stream sensor data (GPS, acceleration, etc.) from a device to a server. What would be the best technology to do this? Is it possible to use RTSP? What else would you recommend me to use?
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Nov 9, 2010
I am developing an application that read data from sensors and write those data to an XML file when you press a key. i have 2 activity one for button and another is an Activity who implements sensorEventListener. the problem is my main activity is button and couldn't get data from event listener activity. i think the listener activity is not active but when i create an intent and start activity with that intent the program stop working. the button is able to create XML file solely.so how could i read sensor data from sensors,and how to send them to XML file when the button got clicks.
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Jun 7, 2010
I'm using Android 2.1 on a HTC Nexus One. I want to collect sensor data while the device is turned off.
By using android.app.Service this works well while the app is in the background but stops working when the display is turned off by the hardware button.
Is there a possibility to collect sensor data while the display is turned off?
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Nov 24, 2010
I have written a TestSuite to find out how to calculate the rotation angles from the data you get in SensorEventListener.onSensorChanged(). I really hope you can complete my solution to help people who will have the same problems like me. Here is the code, i think you will understand it after reading it. Feel free to change it, the main idea was to implement several methods to send the orientation angles to the opengl view or any other target which would need it. method 1 to 4 are working, they are directly sending the rotationMatrix to the OpenGl view. method 6 works now too, but i have no explanation why the rotation has to be done y x z.. all other methods are not working or buggy and i hope someone knows to get them working. i think the best method would be method 5 if it would work, because it would be the easiest to understand but i'm not sure how efficient it is. the complete code isn't optimized so i recommend to not use it as it is in your project. Code...
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Feb 8, 2010
I have a HTC Hero here, and when I tried to get the list of available sensors on the device by calling ((SensorManager) getSystemService (Context.SENSOR_SERVICE)) .getSensorList(Sensor.TYPE_ALL); I get only the following sensors: D/SensorManager( 6302): found sensor: BMA150 3-axis Accelerometer, handle=0 D/SensorManager( 6302): found sensor: AK8973 3-axis Magnetic field sensor, handle=1 D/SensorManager( 6302): found sensor: AK8973 Orientation sensor, handle=2 D/SensorManager( 6302): found sensor: AK8973 Temperature sensor, handle=3 According to the specs, there should be a light and a proximity sensor on the Hero, and I've seen it in action (the automatic screen brightness adjustment) - so at least the ambient light sensor is definitely there. My question is then, why doesn't the getSensorList return for me the light and the proximity sensors?
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Nov 2, 2010
Does anyone know the difference between the orientation sensor and magnetic field sensor on Android?Since I've read that magnetometer is synonymous with digital compass I'm a little bit confused. What are they really?
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Oct 30, 2009
Or it's just some virtual sensor the uses the data provided by the accelerometer and the magnetic field sensor to calculate the orientation?
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Nov 18, 2009
Can some one point towards any documentation/resources/ threads that can explain how a new sensor support can be added in android sensor framework?
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Feb 18, 2010
My home icon is way less responsive than the back icon which seems to be perfectly normal. Sometimes I have to "press" the home icon twice to get the "buzz" and have it move the screen. However the back icon works 99% of the time on the first press. IS there any adjustment I can make or should I bring the phone back. I have had it now for 2 weeks.
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Nov 13, 2010
I need to create a service that runs a piece of code in new thread after (let us say) 10 mins. How can I do that? I have service ready but I don't seem to understand how (if ) to call timer from within thread.
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Sep 17, 2012
I would like to make an app that measures little time intervals (nanoseconds) so I need to know about time resolution and precision regarding such measures with an Android device.
In other words:
- Is it feasible to get reliable values of the current time with nanosecond resolution?
- If so, is feasible to measure such little time interavals? I mean, is there any way to tell the app/OS to focus on measuring the time interval specified in the current thread instead of allowing other processes to make the measuring task not precise?
I've tried to measure the time between the execution of two different lines in code but the results are not always the same, somehow random, then I suppose Dalvik and its process management is causing this to be unreliable and random. What I need to do is to measure distances by getting transmission and reception of audio tones of 16-20 KHz (done in [1] with iOS), thus needing resolution and precision.
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Aug 11, 2010
I've read through the SampleSyncAdapter project
(http:// developer.android.com/resources/samples/SampleSyncAdapter/index.html).
The main entry point for the SampleSyncAdapter appears to be the onPerformSync(...) method. In the documentation page for the sample, it mentions that "[onPerformSync]...gets called whenever the sync manager issues a sync operation for that sync adapter." Who is this 'sync manager', and at what intervals will it instruct the sync adapter to onPerformSync()?
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Sep 21, 2010
I was checking what was eating my battery the most earlier and noticed that calendar was the biggest drain based on partial wake usage.Can I set the interval that the calendar updates?I would like it to be automatic...just a.little less often.Is it possible that the gmail app also controls frequency for the cal? Something that popped into my head just now.
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May 29, 2010
Is there a way to set gmail app to check for emails every say 15 minutes instead of push?
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Jan 16, 2013
Is the an app to simulate a tap on the screen at set time intervals?
I have googled for ages now and the closest I have came it to use screencaster and a auto-clicker for windows but I couldn't get the keyboard and mouse inputs to work.
Also I'm running a rooted 4.1.2 ROM
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Apr 29, 2010
I am looking for an app that will change my wallpaper at random or set intervials. Does anyone know of such an app and if your phone needs to be rooted to use it?
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Apr 2, 2010
Is there any way to specify the time intervals that the Location Manager broadcasts the current location?
I am using a method called startListening:
CODE:.....................
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Mar 31, 2010
I looked thru lots of calculator apps but they seemed to be either tip calculators or scientific ones. I'd like on that's just like the calculator i use at my desk. I know how to figure out what the tip amount would be so don't really want one that does only that. and the one that seems to be in my Droid doesn't have a % key, unless i've missed it. I just don't see the need to have 2 different kinds of calculators taking up space on my phone.
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Jul 26, 2010
I have an iPhone 4g microsim...my phone should be in soon...how can I make a microsim fit a regular sim? Is there an adapter? Because the Galaxy S uses a regular size sim card and my iPhone 4 is microsize...
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Oct 7, 2010
Processing has Android support and it seems to be pretty awesome from my 10 minutes of playing with it. But I would like to make a regular (nongraphics) application like a twitter feed reader or something. So is there something like Processing that can do regular apps? Besides Titanium.Basically I am looking for anything that will make coding for android easier, processing was so easy to get working that I was very happy with it, but it is for graphics only. Titanium didn't give me the same wow factor and it isn't open so that kind of takes away from it. What other tools are out there?
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Feb 16, 2009
Is there any way out to achieve "SELECT * FROM tblname WHERE name LIKE '%[0-9]%' ". i know we can't do this with sqlite~ but how to deal with such query task with sqlite? i tried to use REGEXP ~but unluckily it is not pre-defined~ so i tried to define it by myself...but even i couldn't find a way in android to create a UserDefinedFunction...
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Nov 11, 2009
I've got an application that didn't make the cut. How can I get it to move/or can someone at Google please move the app from the ADC site back to normal Android Market panel so I can upload the updated version that included three more months work and, like, a zillion squashed bugs?
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Jun 29, 2010
So I hear people saying that they hate sense, or they love sense. I've never had an android phone before (the last time I bought a phone was 2005). So I've had my incredible for awhile, and without a reference I'm not sure what sense added.
I know they have some sense only widgets, but beyond that, how is it different from plain jane android?
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Aug 23, 2010
Instead of the mobile version? I figured since froyo has flash, that facebook might be fully functional, but it always opens the damned mobile version, instead of the full main pc version.
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