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    <p>Take a look at the <code>getOrientationUsingGetRotationMatrix()</code> method from <code>DeviceOrientationService</code>: <a href="http://androidxref.com/4.3_r2.1/xref/frameworks/base/core/java/android/webkit/DeviceOrientationService.java" rel="nofollow">Link</a> :</p> <pre><code>private void getOrientationUsingGetRotationMatrix() { if (mGravityVector == null || mMagneticFieldVector == null) { return; } // Get the rotation matrix. // The rotation matrix that transforms from the body frame to the earth frame. float[] deviceRotationMatrix = new float[9]; if (!SensorManager.getRotationMatrix( deviceRotationMatrix, null, mGravityVector, mMagneticFieldVector)) { return; } // Convert rotation matrix to rotation angles. // Assuming that the rotations are appied in the order listed at // http://developer.android.com/reference/android/hardware/SensorEvent.html#values // the rotations are applied about the same axes and in the same order as required by the // API. The only conversions are sign changes as follows. // The angles are in radians float[] rotationAngles = new float[3]; SensorManager.getOrientation(deviceRotationMatrix, rotationAngles); double alpha = Math.toDegrees(-rotationAngles[0]); while (alpha &lt; 0.0) { alpha += 360.0; } // [0, 360) double beta = Math.toDegrees(-rotationAngles[1]); while (beta &lt; -180.0) { beta += 360.0; } // [-180, 180) double gamma = Math.toDegrees(rotationAngles[2]); while (gamma &lt; -90.0) { gamma += 360.0; } // [-90, 90) maybeSendChange(alpha, beta, gamma); } </code></pre> <p>Check if <code>rotation</code> indeed holds valid values and that <code>getRotationMatrix(...)</code> is returning <code>true</code>. </p>
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    1. USVikram
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    1. COI checked that source code and it requires the gravity vector and magnetic field vector to be initialized which is only triggered by movement as far as I can see. I won't be able to guarantee initial movement, though, since the tablet will be in a rather sturdy stand.
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      1. USJeremy Miller
    2. CO@JeremyMiller : You do need to initialise the magnetic sensor and the gravity sensor, but they will give you values almost immediately after initialisation. You have to handle them asynchronously (in an event listener) but on almost every case, your fist set of values will come within a few milliseconds after you have started the sensors. I still think that using sensors is an overkill for your purpose.
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      1. USfoibs
    3. CO@JeremyMiller User **foibs** is right. Since your device is on a stand, its `orientation` is fixed and will not change. I believe that orientation-changes can be detected while the device's position has some Y-component. Changes while the device is in X-Z plane (laying flat; no Y-component) cannot be detected. The following statement from android docs on `OrientationEventListener` support this: ` ORIENTATION_UNKNOWN is returned when the device is close to flat and the orientation cannot be determined`. In short, an OrientationEventListener is of little use to you... (contd.).
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