CODEWITHSUNDEEP
javaandroidorientationaccelerometermagnetometer
ayushn21
ayushn21

Reputation: 305

Device orientation on Android

I'm trying to get the device orientation on a Galaxy Note 2. This is my code for the onSensorChanged() method but the RotationMatrix returns false constantly and hence the orientation is not calculated. I've spent several hours going through docs and googling for solutions but they all provide a similar implementation and I can't seem to understand what I'm doing wrong.

For test purposes, I've just output Azimut to the console.

private float[] gravityMatrix;
private float[] magneticFieldMatrix;
@Override
public void onSensorChanged(SensorEvent event) 
{
    if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
    {
        gravityMatrix = event.values;
    }
    if(event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
    {
        magneticFieldMatrix = event.values;
    }
    if(gravityMatrix != null && magneticFieldMatrix != null)
    {
        float[] rotationMatrix = new float[9];
        float[] inclinationMatrix = new float[9];
        boolean success = SensorManager.getRotationMatrix(rotationMatrix, inclinationMatrix, gravityMatrix, magneticFieldMatrix);
        System.out.println(success);
        if(success)
        {
            float orientation[] = new float[3];
            SensorManager.getOrientation(rotationMatrix, orientation);
            System.out.println("Azimut: " + orientation[0]);
        }
    }

This is the LogCat:

12-02 01:20:45.885: D/GestureDetector(18770): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
12-02 01:20:46.040: D/SensorManager(18770): registerListener :: handle = 0  name= LSM330DLC Acceleration Sensor delay= 200000 Listener= com.Ayush.Finch.Misson_Finch.ActivityControlPanel@42bfefd0
12-02 01:20:46.045: D/SensorManager(18770): registerListener :: handle = 1  name= AK8963C Magnetic field Sensor delay= 200000 Listener= com.Ayush.Finch.Misson_Finch.ActivityControlPanel@42bfefd0
12-02 01:20:46.050: D/SensorManager(18770): onAccuracyChanged :: accuracy = 3
12-02 01:20:46.050: I/System.out(18770): false
12-02 01:20:46.195: I/System.out(18770): false
12-02 01:20:46.245: I/System.out(18770): false
12-02 01:20:46.375: I/System.out(18770): false
12-02 01:20:46.445: I/System.out(18770): false
12-02 01:20:46.555: I/System.out(18770): false
12-02 01:20:46.645: I/System.out(18770): false
12-02 01:20:46.735: I/System.out(18770): false
12-02 01:20:46.845: I/System.out(18770): false
12-02 01:20:46.915: I/System.out(18770): false
12-02 01:20:47.045: I/System.out(18770): false
12-02 01:20:47.095: I/System.out(18770): false
12-02 01:20:47.245: I/System.out(18770): false
12-02 01:20:47.275: I/System.out(18770): false
12-02 01:20:47.445: I/System.out(18770): false
12-02 01:20:47.455: I/System.out(18770): false
12-02 01:20:47.635: I/System.out(18770): false
12-02 01:20:47.645: I/System.out(18770): false
12-02 01:20:47.815: I/System.out(18770): false
12-02 01:20:47.845: I/System.out(18770): false
12-02 01:20:47.995: I/System.out(18770): false
12-02 01:20:48.045: I/System.out(18770): false
12-02 01:20:48.175: I/System.out(18770): false
12-02 01:20:48.245: I/System.out(18770): false
12-02 01:20:48.355: I/System.out(18770): false
12-02 01:20:48.445: I/System.out(18770): false
12-02 01:20:48.535: I/System.out(18770): false
12-02 01:20:48.650: I/System.out(18770): false
12-02 01:20:48.715: I/System.out(18770): false
12-02 01:20:48.850: I/System.out(18770): false
12-02 01:20:48.895: I/System.out(18770): false
12-02 01:20:49.045: I/System.out(18770): false
12-02 01:20:49.075: I/System.out(18770): false
12-02 01:20:49.245: I/System.out(18770): false
12-02 01:20:49.255: I/System.out(18770): false
12-02 01:20:49.415: D/GestureDetector(18770): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
12-02 01:20:49.415: D/SensorManager(18770): unregisterListener::  Listener= com.Ayush.Finch.Misson_Finch.ActivityControlPanel@42bfefd0
12-02 01:20:49.420: D/Sensors(18770): Remain listener = Sending .. normal delay 200ms
12-02 01:20:49.420: I/Sensors(18770): sendDelay --- 200000000
12-02 01:20:49.420: D/SensorManager(18770): JNI - sendDelay
12-02 01:20:49.420: I/SensorManager(18770): Set normal delay = true
12-02 01:20:49.420: D/Sensors(18770): Remain listener = Sending .. normal delay 200ms
12-02 01:20:49.420: I/Sensors(18770): sendDelay --- 200000000
12-02 01:20:49.420: D/SensorManager(18770): JNI - sendDelay
12-02 01:20:49.420: I/SensorManager(18770): Set normal delay = true

Upvotes: 0

Views: 344

Answers (2)

Hoan Nguyen
Hoan Nguyen

Reputation: 18151

gravityMatrix = event.values.clone();

and similarly for magneticFieldMatrix

Upvotes: 0

Rohodude
Rohodude

Reputation: 495

Try adding these two permissions in the Manifest file:

android.permission.ACCESS_COARSE_LOCATION
android.permission.ACCESS_FINE_LOCATION

Good luck programming!

Upvotes: 1

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