How to get the Android device's physical orientation in degrees.

Question

I know that I have to use the class OrientationListener to get the angle from the device. I want to get the angle between -90° and 90°. I don't know how to do it. picture on the left: 90 degree, picture in the middle: 0 degree and picture on the right: -90 degree

90 degree -90 degree

Code

class OrientationListener implements SensorEventListener
{

    @Override
    public void onSensorChanged(SensorEvent event)
    {
        angle = Math.round(event.values[2]);

        if (angle < 0)
        {
            angle = angle * -1;
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy)
    {
    }
}

Maybe that will help you: http://stackoverflow.com/questions/4174389/different-values-between-sensors-type-accelerometer-type-magnetic-field-and-type — user3336766, Mar 18 '14 at 09:21

ElectronicGeek · Answer 1 · 2014-03-17T14:10:40.310

2

You can use this code for simple 0, 90, 180 degrees.

Display display = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();

int rotation = display.getRotation();

Surface.ROTATION_0 is 0 degrees, Surface,ROTATION_90 is 90 degrees etc.

You can also use SensorEventListener interface if you want the degrees other than 0, 90, etc:

@Override
public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

        float rawX = event.values[0];
    }
}

You'd need to get use this code to get the degrees:

double k = 90/9.8;
double degrees = rawX * k; // this is a rough estimate of degrees, converted from gravity

edited Mar 17 '14 at 14:10

answered Mar 17 '14 at 13:51

ElectronicGeek

3,312
2
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this is not what i'm looking for – funk Mar 18 '14 at 08:30
`display.getRotation()` would return your app rotation, not physical – user924 Nov 03 '22 at 21:47
what if we need the physical degree ... where could we got that? @user924 – gumuruh Jan 14 '23 at 13:09

score 1 · Answer 2 · answered Mar 18 '14 at 09:23

1

This is a working example.

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    TextView tv = new TextView(this);
    setContentView(tv);

    Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
    int rotation = display.getRotation();

    String rotString="";
    switch(rotation) {
    case Surface.ROTATION_0:
        rotString="portrait";
        break;
    case Surface.ROTATION_90:
        rotString="landscape left";
        break;
    case Surface.ROTATION_180:
        rotString="flipped portrait";
        break;
    case Surface.ROTATION_270:
        rotString="landscape right";
        break;
    }

    tv.setText(rotString);

}

answered Mar 18 '14 at 09:23

ElDuderino

3,253
2
21
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I mean an example of my situation to get the value if i turn the device like in the picture(see my question) – funk Mar 18 '14 at 09:34
Did you try out the example? – ElDuderino Mar 18 '14 at 09:44
yes. but i want the degree value between -90 and 90 degree – funk Mar 18 '14 at 09:53
`display.getRotation()` would return your app rotation, not physical – user924 Nov 03 '22 at 21:47

score 1 · Answer 3 · answered Jul 14 '15 at 04:17

This is an old question, but there is an OrientationEventListener() I found while trying to figure out the rotation for a camera in degrees.

 public void onOrientationChanged(int orientation) {
     if (orientation == ORIENTATION_UNKNOWN) return;
     android.hardware.Camera.CameraInfo info =
            new android.hardware.Camera.CameraInfo();
     android.hardware.Camera.getCameraInfo(cameraId, info);
     orientation = (orientation + 45) / 90 * 90;
     int rotation = 0;
     if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
         rotation = (info.orientation - orientation + 360) % 360;
     } else {  // back-facing camera
         rotation = (info.orientation + orientation) % 360;
     }
     mParameters.setRotation(rotation);
 }

The answers here actually help me as I am not capturing the onConfigurationChanged() as discussed in the Handling Runtime Changes Yourself topic in the developer guide.

I am simply going to use the display.getRotation() method presented by Elduderino here in onSurfaceCreated() of MyActivity to set the rotation of the camera appropriately. This will work as the surface gets recreated by default whenever the device orientation changes.

How to get the Android device's physical orientation in degrees.

3 Answers3

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