Android :: Accelerometer Power Tied To Display Backlight
Mar 14, 2009
Although I haven't received confirmation from anyone at Google, I can confidently state that when the power to the display goes off, one can no longer obtain data from the accelerometers. I can easily think of a number of examples of where one would like to continue collecting accelerometer data even when the display is of. Supposing that I wanted to "fix" this, can anyone suggest where should I start looking? Would this be in the SDK, the kernel, or in some proprietary firmware that I can't touch?
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Mar 3, 2010
Is there a way to have the backlight always on when on AC power? I have a cradle and would like to have the backlight always on when in the cradle.
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Sep 1, 2013
i was trying to get cwn recovery onto my phone and as said i was unsure of what i was doing (i know im Stupid) i had already sucessfully rooted the phone and i opened mtkdroid tools and clicked backup and recovery the box on the right started to spit out text as my phone became detached from the data cable.
Now when i try to power up the phone the backlight lights up for 3-4 seconds then nothing if i hold
volume + and power with no data cable i get the same backlight for 3-4 seconds
volume + and power with data cable i get a dead droid with a red ! in a triangle in its belly ?
the phone displays a battry bar in blue if i do nothing
the pc seems to recognise phone as universal serial bus
mtkdroidtools does not regognise the phone at all
the phone did say android preloader driver not found but ive installed this and this has now disapeared?
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Jun 9, 2009
I am developing a game. In which the user controls movement using the accelerometer. Sounds effects can also be enabled. However when laying the phone flat down and playing the game without the accelerometer gives nice 0,0,0 values. However when play WITH SOUNDS on, i get a buch of weird values: while the phone is NOT moving.
This is really a big bug that makes life hard for Game Developers. I tried to take an avarge of the last 5 values from the sensor.. but this is not enough.. The harder the sounds plays: the higher the weird sensor values. When using the headphones: almost no weird values. Seems that sounds interferes with the accelerometer sensor.
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Aug 16, 2010
I have a ListView backed by a custom adapter based on a CursorAdapter.The cursor I give it is based on a list of Notes in the database (each note is a DB row).Everything works just fine until I delete a note from the database. I'm not sure how to properly update the cursor/adapter/listview to display the new data.I've read conflicting posts on using adapter.notifyDataSetChanged() vs cursor.requery() to refresh the UI, but neither of them seems to work in this case.The only way I've been able to refresh it is by creating a new cursor from a new query and calling adapter.changeCursor(newCursor).Could someone demonstrate the proper way to update the backing data and then the UI (with psuedocode if possible).
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Nov 15, 2010
phone: HTC Desire HD
settings:
accelerator: off
animation: off
brightness: zero
screen timeout: 15 seconds
notification: off
wallpaper: black / non-live
however battery use screen shows display 73%..! Is that normal, how can I reduce it?
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Aug 9, 2010
I have a black background, I keep the display settings at the lowest brightness settings, and I keep the screen off when I'm not using it, but my phone is dying after 8-10 hours if I don't use it very much and 4-5 hours if I use it regularly. Every time it indicates that it needs to be recharged, 65-80% of the power is going to the display. I...don't see how that can be.I'm using a Samsung Vibrant that I bought on July 30th.
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Oct 17, 2010
You know how when you press the power key, it's suppose to turn off the display? Well my display isn't turning off when I press the power key.
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Oct 2, 2009
When I kill any Google app, even the built in ones, android.process.acore doesn't crash causing a cascade effect of wonderfulness that is a black Launcher screen sometimes. So it can't be related to being integrated into Google Authentications or something. So, why the heck does myFaves do this? According to it's package info it's process should be com.tmobile.myfaves.
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Oct 18, 2010
I'm learning about the android. Now, I want to display a button that can turn off the screen. That is when the user click the button the screen off as the user click the power button. How can I do this?
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Mar 1, 2010
I'd like to know how to turn on/off the backlight of a phone in android and how to get the time after which the backlight is supposed to go off.
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Jul 1, 2010
My application requires resource and drains a battery when it is working. So, I want to know the way that user is not available on the phone. Is there a way to use the built in power save mode on the blackberry to where if the screen dims to suspend the application works active and when the user wakes the device back up with a keypress or trackball movement to resume the application works active?
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Jan 5, 2010
Has anyone had any luck with aftermarket power supply's. I'd like a car/ac charger or a stand alone power pack. I usually use my DEXIM. but it does not work with the Behold 2. I've tried a car charger/battery unit by Wireless Gear that said it was compatible with all Samsung phones, it came with 5 power tips and a USB outlet that still would not work, even using the OEM USB cable. Any suggestions would be appreciated. I will go with OEM Samsung if necessary, but there selection is limited.
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Oct 29, 2013
I have a rooted Galaxy S3 with Android 4.1.2, and for some strange reason they've changed the screenshot combination away from the Power+VolDown that other Androids use to Power+Home which can't realistically be pressed one-handed. How can I change it back to Power+VolDown?
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Jul 31, 2010
I am trying to detect Screen backlight On / Off.
I've found android.intent.action.SCREEN_OFF related its event.
But I don't know how to use this.
Can you suggest me about how to detect screen backlight on / off ?
I missing some example or sample code.
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Mar 2, 2010
Could someone show me in a snipet of code how to set the backlight always on in android ?
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Sep 21, 2010
In my android application i would like to keep the backlight on always,without the screen getting locked.
Is there any way that i can do this code...
Have also used user permission in manifest.
To be more clear i have placed this in my splash screen but the issue is like the splash screen gets started after a particular time the screen shows force close after a bright light.
Could you please let me know if there is any solution for this.
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Mar 2, 2010
In my android app , I have a menu for backlight options ,and I want that when the user selects one like " during this operation " to have the backlight on during that operation. Could I be be shown a way of accomplishing this . My problem is the that I don't know how to manipulate the backlight and how to properly arrange this in the code.
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Jul 10, 2009
I'm designing a game for Android and I would like to use the accelerometer for some aspects of control. Has anyone come across a tutorial or example for something like this?
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Jan 15, 2010
My accelerometer is not reading the angle of the phone right. When I play Teeter I have to keep the phone on a sharpe angle to keep the ball still, and I feel I have to rotate it extra to go into landscape mode. Now the question is... how do I readjust the accelerometer?
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Jan 23, 2009
Where can I find a simple example application that uses the Accelerometer Sensor?
I've seen the Open Intents applications, but I'd rather use the raw Android API, at least until I understand it a little better. I'm surprised at the lack of documentation.
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May 20, 2010
I want to know how to calculate the accelerometer movement.When i place the mobile horizontally in idle state and similarly when i place the mobile in hands,So there accelerometer value change when it is place horizontally or while it is in hand vertically.How To Identify them,Any Sample Codes will be useful.
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Aug 23, 2010
I'm working on adding a calibration feature to an accelerometer-driven game. For the calibration, I need a single value from the accelerometer. Should I register a listener, get the first value it gives me, and unregister it, or is there a better way to get just one value?
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Jan 1, 2013
my phone is karbon A9+ and i wiped the cash,system and data and after that flashed a Custom ROM ! but now the phone just power on in download mode!! how to power on, for recovery or normal power on ! the phone just have the black screen with "Entry QPTS Downloading" Text..i will back to India 5 month later ! can it be fixed or i have to wait for 5 month to come back and send it to service !
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Apr 8, 2010
I've been playing with the data given by the accelerometer,trying to work out how I can gauge a shake from front to back or side to side. This all seems straightforward enough.But I'd love to know the direction of the shake. So, if the user is shaking backwards and forwards, I want to know if the device is moving away from the user, or back towards him/her. I can't find any way of telling this.
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Oct 17, 2010
I'm tinkering around with trying to build a speedometer using only the accelerometer for use when I go snowboarding. I can read values from the accelerometer but I'm not sure how I would derive the velocity. I was thinking of taking the square root of (X^2 + Y^2 + Z^2) where X, Y, and Z are the values reported by the accelerometer in each axis but that only would only give me the amplitude of acceleration at any given instant. I could multiple that by the sampling frequency to get my instantaneous velocity but this approach fails when I'm moving at a constant speed.
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Feb 11, 2009
I wanted to get the frequency of accelerometer output. How many readings can I get per second? And to what precision do I get?
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Jun 7, 2010
I know this question is definitely solved somewhere many times already, please enlighten me if you know of their existence,
Quick rundown:
I want to compute from a 3 axis accelerometer the gravity component on each of these 3 axes.
I have used 2 axes free body diagrams to work out the accelerometer's gravity component in the world X-Z, Y-Z and X-Y axes. But the solution seems slightly off, it's acceptable for extreme cases when only 1 accelerometer axis is exposed to gravity, but for a pitch and roll of both 45 degrees, the combined total magnitude is greater than gravity (obtained by Xa^2+Ya^2+Za^2=g^2; Xa, Ya and Za are accelerometer readings in its X, Y and Z axis).
More detail:
The device is a Nexus One, and have a magnetic field sensor for azimuth, pitch and roll in addition to the 3-axis accelerometer.In the world's axis (with Z in the same direction as gravity, and either X or Y points to the north pole, don't think this matters much?), I assumed my device has a pitch (P) on the Y-Z axis, and a roll (R) on the X-Z axis. With that I used simple trig to get:
Sin(R)=Ax/Gxz
Cos(R)=Az/Gxz
Tan(R)=Ax/Az
There is another set for pitch, P.Now I defined gravity to have 3 components in the world's axis, a Gxz that is measurable only in the X-Z axis, a Gyz for Y-Z, and a Gxy for X-Y axis.Gxz^2+Gyz^2+Gxy^2=2*G^2 the 2G is because gravity is effectively included twice in this definition. Oh and the X-Y axis produce something more exotic I'll explain if required later.From these equations I obtained a formula for Az, and removed the tan operations because I don't know how to handle tan90 calculations (it's infinity?).So my question is, anyone know whether I did this right/wrong or able to point me to the right direction?
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Oct 27, 2009
I have a code snippet to detect accelerometer movements. It works some times by properly detecting slight movements, but sometimes it detects movements when I kept my device idle too. Are there any problems with built-in accelerometer detection on Android?
I use an HTC G-1 device. My code snippet is below. How do I resolve it so I can detect small device movements but not detect anything when the device is idle?
CODE:..............
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Oct 13, 2010
i dont have an android phone write now.But in my application i need to use accelerometer values..so i need an a simulator capable of it.
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