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I use the following (assuming to be quite standard) code to retrieve the orientation of a tablet device for augmented reality purpose (so the back-camera should point a valid direction).

private Sensor mAccelerometer;
private Sensor mMagnetometer;
private float[] mLastAccelerometer = new float[3];
private boolean mLastAccelerometerSet = false;
private float[] mLastMagnetometer = new float[3];
private boolean mLastMagnetometerSet = false;

private Sensor mAccelerometer;
private Sensor mMagnetometer;
private float[] mLastAccelerometer = new float[3];
private boolean mLastAccelerometerSet = false;
private float[] mLastMagnetometer = new float[3];
private boolean mLastMagnetometerSet = false;
private float[] inR = new float[9]; 
private float[] mR = new float[9];
private float[] mOrientation = new float[3];
...
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
...     
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mMagnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
...
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_FASTEST);
mSensorManager.registerListener(this, mMagnetometer, SensorManager.SENSOR_DELAY_FASTEST);
...
public void onSensorChanged(SensorEvent event) {
    synchronized (this) {
       if (event.sensor == mAccelerometer) {
            System.arraycopy(event.values, 0, mLastAccelerometer, 0, event.values.length);

            mLastAccelerometerSet = true;

        } else if (event.sensor == mMagnetometer) {
            System.arraycopy(event.values, 0, mLastMagnetometer, 0, event.values.length);

            mLastMagnetometerSet = true;
        }

        if (mLastAccelerometerSet && mLastMagnetometerSet && scene.camera() != null && mPlane1 != null) {
            SensorManager.getRotationMatrix(inR, null, mLastAccelerometer, mLastMagnetometer);
            SensorManager.remapCoordinateSystem(inR, SensorManager.AXIS_X, SensorManager.AXIS_Z, mR);
            SensorManager.getOrientation(mR, mOrientation);

            /* my code that handles mOrientation */
        }
    }
}

The problem is that this code works flawlessly on a Samsung Galaxy Tab 10.1 (P7500, first version). With the same code running on a Asus Transformer Pad Infinity (TF700), the first value mOrientation[0] only varies between +2.0 and +3.0 when rotating the tablet around myself (I would expect that it will go between 0 and 3.14).

Is there something wrong with the device or are there other variables that I overlooked?

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1 回答 1

0

华硕TF700的硬件一定有问题。它要么在我们拥有的这个特定版本中，要么在设备的设计中。对于其他 Android 设备，该应用程序按预期工作。

于 2013-09-26T13:38:55.767 回答