Android :: Filtering Sensors Noise?
May 21, 2010
I'm programming an Augmented Reality application. It's development it's in an advanced state but I can't place the icons on the screen so still as anothers programs does (Layar, in example). This is because of the continuous variations of the sensors. I've tried the three modes of the sensors (FAST, GAME, and NORMAL) but I only get them to move more or less fast. The shivering is the same at different speed.
Finally I thougth I could reach my goal with a digital filter, averaging historical values. But again the icons continues moving, specially the most far placed ones (in the z axis). Please, could some one help me with some clue?
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Oct 28, 2009
How do I filter noise of the accelerometer data in Android? I would like to create a high-pass filter for my sample data so that I could eliminate low frequency components and focus on the high frequency components. I have read that Kalman filter might be the best candidate for this, but how do I integrate or use this method in my application which will mostly written in Android Java? or can it be done in the first place? or through Android NDK? Is there by any chance that this can be done in real-time?
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Oct 10, 2009
A simple question: How do I register for multiple sensors? I just switched from registerListener(SensorListener listener, int sensors, int rate), which is deprecated, to registerListener(SensorEventListener listener, Sensor sensor, int rate). Previously, I could use " | " to indicate multiple sensors, but now " | " is undefined, so how?
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Jan 12, 2012
Last night i have downloaded Dolphin to play Wii Games. As you can imagine, play with the mouse is not as comfortable to emulate Wiiremote.
My idea is basically:
Control WII emulator with Android Sensors (As accelerometer, gyroscope, inclinometer) like Wiimote does
It seems to be quite interesting, I think that may be connectable by wifi and bluetooth with receiver (pc).
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Aug 17, 2010
We are supposed to make UI actions only from the main UI thread. But it is not clear to me if callbacks like LocationUpdateListener (and other callbacks from sensors) are already in the UI thread or they require special care to access the UI components.
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Nov 13, 2010
I am looking for a way to get sensors' data ( especially Accelerometer) directly without using Listener approach. Actually I need to have the data really fast! I can not find any way to read sensor data by myself. Anybody knows anything about it? Is it possible to read data with more than 50Hz?
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Mar 19, 2009
I am now beginning an app which will use the compass and tilt sensors to determine a persons heading and line of sight. Can I assume the sensors on devices such as the G1 are fairly accurate or can I expect to run into problems such as the compass being 5-10 degress off etc?
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May 24, 2010
I have following code:
CODE:...........
Code is working but here goes my problem: when I call it from main activity in this way:
CODE:........
Then i can see 10 times result of 'doing sth else!!!' and when loop is over i can see then result from activity. So sensor activity waits for some reason and then when main activity has nothing to do, sensors are doing their job.
of course I have well implemented: onActivityResult(int requestCode, int resultCode, Intent intent)
I want to read sensord data directly, not using listeners, is it possible?
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Dec 8, 2009
Anyone know if it's possible to obtain the physical height or altitude of your device, using the sensors or by any other means?
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Jan 20, 2009
The accelerometer turns off when the screen is off. I'm guessing this is a bug but I haven't seen it logged. Am I missing something?
Perhaps the power management features need some improvement - the ability to specify what components are needed during a partial_wake_lock so that power can be conserved as efficiently as possible.
BTW, there is a bug logged noting that onSensorChanged() continues to be called for the orientation sensor (during sleep) but the values are not being updated.
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Jan 29, 2010
I can't seem to find this info on the droids temperature sensor (the one available in the SDK):
Does it indicate ambient temperature or is it the temperature of the phone or chip?
Also, does the pressure sensor indicate atmospheric pressure?
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Aug 11, 2009
I am having a difficult time figuring out a way to read the sensor data from a home screen widget. I can successfully create a home screen widget that extends AppWidgetProvider. I can successfully create a stand-alone application that reads sensor data (extends Activity). What seems to be impossble (for me) is combining them into a home screen widget that reads sensor data. The classes that you have to use, like SensorManager, SensorListener all seem to require an Activity which the AppWidgetProdiver doesnt have. I have also tried keeping my sensor data reader in a separate class that extends Activity and then instantiating that class in my widget. Makes sense in my head but no data is ever read from the sensors.
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Jul 23, 2010
Is it possible?
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Jan 6, 2012
After porting ICS, derived sensors are not working.when i browse through SensorService code, i found that in ICS derived sensor data is computed only if accelerometer, magnetometer and gyro are present.I dont have gyro in my device. Is this the reason for failure?
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Dec 6, 2012
How to make the following phone's magnetic and orientation sensor working? Both of these sensors are not working on my phone (verified by many apps such as Z-deviceTest, AndroSensor and Android Sensor Box).
Various applications have shown that this phone has 5 sensors :
- yamaha530 Orientation Sensor : 0.25 mA by Aichi Steel
- yamaha530 3-axis Magnetic Field Sensor :0.25 mA by Aichi Steel
- bma222 3-axis Accelerometer : 0.13 mA by The Android Open Source Project
- tmd2771 Proximity Sensor : 0.13 mA by Capella
- tmd2771 Light Sensor : 0.13 mA by Capella
Phone name : Clone Samsung Galaxy III S9300
Manufacturer : alps
Model: e1901_v77_jbl1_9p017
CPU: MTK6577 Dual Core 1.0GHz
Android version : 4.1.1
Baseband version : MAUI.11AMD.W12.22.SP.V15,2012/10/08 20:09
Kernel version : 3.4.0 (root @ abc-desktop) #1 SMP PREEMPT Mon Nov 12 18:32:14 CST 2012
Build Number : e1901_v77_jbl1_9p017_20121105
Perhaps there is new ROM or kernal that can handle the sensors better?
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Jun 20, 2010
i came from a blackberry so learning here..but i know how to set up my pop email account to go through gmail and get sent to my phone, however can i filter only certain emails to my phone? i really dont want them all going to my phone as i read most via computer, i only want ones coming from certain contacts being sent to my phone.
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Oct 31, 2009
I am looking for an all-in-one SMS app that can filter incoming messages based on words and phrases in the message. The reason being that I have monitoring systems at work that send SMS alerts and sometimes the alerts are just FYI, not OMG's
So anyways, right now I have a Hero, so I use Handcent for the replacement of the stock app until it is fixed and SMS Firewall to filter incoming messages and do the alerting. Being a 2 part solution it works very well, but I was curious if anyone has tried anything that has it all in one.
I have tried a few of the apps out there and none seem to work right.
Here's what I tried without success
aFirewall (didn't seem to filter properly)
SMS manager (can't remember what was wrong)
SMS Guard (kept getting a force close when a message came in)
PandaFirewall (didn't filter anything properly when I tested)
GSMS (force close when trying to view inbox)
I was going to try UltimateSMS, but it appears to have been removed from the Market.
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Jan 28, 2010
I have a problem, I need some hints. I need to have my app receive certain kind of sms (say meant for my app). is it possible?Is it possible to receive all the sms in my app rather than default sms app? How to configuration my app to receive sms?please help with some links and stuff.
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Feb 24, 2010
I am trying to write a clean bit of code that can list the people in a 1.5/1.6 Contacts data store, and I do not see how I filter out the cruft that Google throws in (ad hoc "contacts" literally addressed by other apps and stored, for some reason, in the contact list without a clear means of discerning them from the real people the user cared to enter - the ones that would appear in the contacts app). I see that in 2.0 or so, "IN_VISIBLE_GROUP" is added as a field which seems to differentiate these versions, but what existed to accomplish this before that time? Here is my code which works in 2.x and fails to keep the chaff out in 1.x, as the selection parameter is unsupported:
final String[] proj = new String[] { Contacts.People._ID, Contacts.People.NAME };
final String selection = Build.VERSION.SDK_INT < 5 ? null : ContactsContract.Contacts.IN_VISIBLE_GROUP + "=1";
Cursor people = context.getContentResolver().query( Contacts.People.CONTENT_URI, proj, selection, null, Contacts.People.DEFAULT_SORT_ORDER);
if (people != null) { final int personIdColumn = people .getColumnIndexOrThrow(Contacts.People._ID);
final int nameColumn = people .getColumnIndexOrThrow(Contacts.People.NAME);
while (people.moveToNext()) { if (Thread.interrupted()) { people.close();
outputList.clear(); throw new InterruptedException();
} long personId = people.getLong(personIdColumn);
String name = people.getString(nameColumn);
if (name != null) { outputList.add(new Contact(personId, name));
} } // clean up cursor people.close();
}
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Aug 5, 2010
I have a ListView (with setTextFilterEnabled(true)) and a custom adapter (extends ArrayAdapter) which I update from the main UI thread whenever a new item is added/inserted. Everything works fine at first--new items show up in the list immediately. However this stops the moment I try to filter the list.Filtering works, but I do it once and all of my succeeding attempts to modify the contents of the list (add, remove) don't display anymore. I used the Log to see if the adapter's list data gets updated properly, and it does, but it's no longer in sync with the ListView shown.
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Feb 27, 2010
Since the query that comprises my ListView basically gets the rowID, name, and a third column from my databases's table, I want to be able to filter the cursor based on the partial value of the name column. However, I am uncertain of whether I can do this directly from runQuery without expanding my DB class since I want to filter the existing cursor, or will I have to create a new query function in my DB class that partially searches my name column, and if so, how would I go about creating the query statement while using the CharSequence constraint argument in runQuery?I am also concerned about the performance issues associated with trying to run multiple queries based on partial text since the DB table in question has about 1300-1400 rows. In other words, would I run into a bottleneck trying to filter the cursor?
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Aug 18, 2010
I'm just learning OpenGL ES on Android, and I am trying to get some kind of anisotropic filtering on textures. I want to increase the size of a sprite, with some kind of interpolation, instead of this "nearest-pixel-interpolation".
Is there anything like this in the OpenGL ES standard or do I have to make one texture for each size?
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Sep 27, 2010
Is there a way to filter audio in android system? I am interested to get only the audio of a fixed frequency.
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Feb 25, 2010
I need to filter the required information from list of data. I am really looking to use combobox for it
Does the android provide a way to make a combobox to filter the data? I have read on android developer forum that you can build custom components but I don't have any idea how does it work for combobox?
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Apr 27, 2010
I'm trying to filter my ListView which is populated with this ArrayAdapter:
CODE:............
However, when I call filter('test') on the filter nothing happens at all (or the background-thread is run, but the list isn't filtered as far as the user conserns).
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Nov 26, 2009
I have my own widget container. I am running the intent 'ACTION_APPWIDGET_PICK' but I want only to show some items in the list and not all items. Is there a way to filter the list?
if not, is there any way to let the user just add one widget to my container, and not have to select form the list?
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Apr 16, 2010
Code below creates an Alarm, so far everything is working fine. But i am a bit lost in the Documentaion how to cancel an Alarm. I need to cancel only special Alarm(s) depending on Intent#putExtra(IntentConstants.SELECTED_PRIMARY_KEY,_selectedID);
How can i archive this ?
CODE:.....................
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Nov 8, 2010
Anyone know of an app that can take video from the camera and display it live on the screen, but with color filters applied? Specifically, I'm looking for something that can amp up the color saturation. I've got lousy color vision and it'd be handy to have something to help distinguish subtle color variations. Nice-to-have would be an eyedropper mode that can tell me the rgb values of a selected region.
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Mar 19, 2013
My concern as a parent now is the internet safety and security. Any good applications for parental control on Android.
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Jul 31, 2009
Is there an app or a way to have filters on Facebook AND Twitter (but mostly Facebook) that we can put select people in that whenever those people update their statuses we get alerted. Is there any way to do that either on or off the phone so that we can get updated on the phone and respond?
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