Android Tutorial Orientation and accelerometer

Erel · Nov 21, 2010

The attached program displays the values of the different sensors:

It creates a PhoneSensors object for each type of sensor.
As you can see in the attached code, two Maps are used to hold the phone sensors and the other required data. This way there is no need to write any duplicate code.

A better method for finding the orientation values: https://www.b4x.com/android/forum/threads/orientation-and-accelerometer.6647/page-6#post-476271

Erel · Oct 30, 2013

Is your app using PhoneSensors? Did you copy it to the internal libraries folder?

Erel · Oct 31, 2013

You are currently the only one that encounters this issue. Have you downloaded this library: http://www.b4x.com/android/forum/threads/orientation-and-accelerometer.6647/page-3#post-196085 ?

Erel · Nov 5, 2013

All Basic4android apps use the same "log tag".

When an activity is paused its events will not be raised. However if you haven't explicitly stopped the sensors then the sensors listeners are still active.

Erel · Nov 6, 2013

The log message was inside the library code before the event was actually raised.

Mitesh_Shah · Nov 9, 2013

HI i am new in b4a. i need some help to put ACCELEROMETER data (X,Y,Z) into some text box and SeekBar

thanks

Erel · Nov 10, 2013

I recommend you to start with the Beginner's guide.
http://www.b4x.com/android/documentation.html

dossa · Nov 26, 2013

Hello.
i need to give only accelerometer data(z) in variable. Can you help me?
Sorry for my english.
thanks

Erel · Nov 26, 2013

Remove the code that adds the other sensors. The three values are intercepted in the SensorChanged event.

JordiCP · Dec 3, 2013

Hi all,

I want my app to decide when to be drawn in portrait or landscape mode, or reverse ones. Based on the X,Y sensors, it seems to be easy to know when it has rotated.

For instance, in a phone I get theses values (aprox)

portrait: X=0 Y=9.8
lanscape: X=9.8 Y=0 (rotating 90º left from portrait)

when running on a tablet, I have,

landscape: X=0 Y=9.8
portrait: X=9.8 Y=0

So sensors info is not enough for me to decide when to draw in landscape or portrait, since X,Y assignments seem to be related to the device default orientation. How can I decide how these values are related to the actual screen orientation?

(One possible approach would be trying to "guess" default screen orientation based on device type and screen size, but I am sure this will not work always.)

----------EDIT------------------------
Have just found LibDisplay tutorial from joseluis

http://www.b4x.com/android/forum/threads/libdisplay-module.14111/#post79879

So I assume that accelerometer sensor information is related to the default screen.

Thanks.

Erel · Dec 4, 2013

Why don't you let Android take care of that?

You can set the #SupportedOrientations value to fullSensor.

JordiCP · Dec 4, 2013

Erel said:
Why don't you let Android take care of that?

You can set the #SupportedOrientations value to fullSensor.

Thank you for pointing this, Erel

There are two reasons for doing it this way

My app uses the camera and only want the device to rotate under certain situations. For instance, not rotate accidentally when taking the photo, and let the user rotate freely when editing it
In some devices, I still have a problem each time I rotate, memory gets lower till it crashes as stated here. So I want the user to start the app in the orientation he chooses, but blocking rotation afterwards.

I would prefer only to control it only for reason 1, but the second is also there

Erel · Dec 4, 2013

You can lock the orientation at runtime with the Phone library.

Scooter Willis · Jan 17, 2014

Rick Harris said:
Hi Erel,
The problem still persists. FYI: every True is preceeded by a line in the log file that states: "Ignoring event: sensor_sensorchanged". After releasing or debugging the app, the TRUE's keep coming, even if I stop the app and remove it from my Android (while leaving B4A running)! Deleting everything that involves the sensors in the sourcecode does not help either. It looks almost as if B4A has started another app or service, but there are no services in my app.
Please help. I am now trying to add In-App billing but the True's make it impossible to debug.

UPDATE: The problem is now solved. This was done by closing one of my other apps which starts up automatically when the Android is switched on (using a Service). Strangely enough this app, even though it should be in activity_pause condition, apparently reports the status of its sensors to B4A while I am working on another app! Any idea about the cause?
Could this be some kind of memory leak?

I have the same repeated output of true problem when beginning to listen to sensor value for barometric pressure. Using v3.0 with 2.2 phone library.

Erel · Jan 18, 2014

See my answer in the other thread.

Ashley · Apr 8, 2014

Erel said:
The attached program displays the values of the different sensors:

It creates a PhoneSensors object for each type of sensor.
As you can see in the attached code, two Maps are used to hold the phone sensors and the other required data. This way there is no need to write any duplicate code.

Hi Erel, I'm trying to get the exact direction in degrees the phone is facing. The position variables (x,y,z) seems to give errors in some directions. Is there any code that combines the relevant sensors to get the AHRS?.
Thanks
Ashley

Erel · Apr 9, 2014

I don't think that such code is available.

apty · May 14, 2014

how can i run a service that displays x,y,z values of the sensor (accelerometer only)? i.e instead of activity module, i make it service module

Erel · May 15, 2014

Where do you want to display the values? Services do not show any UI.

flightnet · May 22, 2014

Hey,
I have an additional question, how can I find the g. If I propebly swing the phone so that it Shows me how meny g are given in this Moment.

klaus · May 22, 2014

Divide the acceleration values by 9.81
1 g = 9.81 m/s2

Android Tutorial Orientation and accelerometer

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