Orientation in Android

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Hi guys,
I need something from your brain and mind d^_^b.
Here's the issue :
I need to know how do android device managing it's orientation? I mean, how do I know it will get Landscape or Portrait or else (on what degree of obliquity).

I got these code :

C++

  float angle = event.vector.roll;
if(angle >= 45 && angle < 135)
		newOrientationType  = OET_ASPECTLANDSCAPE_LEFT;
	else if(angle >= 135 && angle < 225)
		newOrientationType = OET_ASPECTPORTRAIT_REVERSED;
	else if(angle >= 225 && angle < 315)
		newOrientationType = OET_ASPECTLANDSCAPE_RIGHT;
	else
		newOrientationType = OET_ASPECTPORTRAIT;

Here's the clue of above :
angle : determined how much device has been tilted
newOrientationType : determined the orientation.

The question is : "When's 45,135,255,and else degree for the devices?"

Ok, that might be unclear.

So watch this :

^ ^
_ _ , is the normal position (but what degree??) (OET_ASPECTLANDSCAPE_RIGHT)

| >
| > , what degree?? (OET_ASPECTLANDSCAPE_LEFT)

\
\ , what degree?? (OET_ASPECTLANDSCAPE_LEFT)

Note : "_ _" : position of device

"^" and ">" : device's screen facing to (as for the (3), diagonal, it's should be facing 45 degree (top right).

Thanks

Posted 17-Jun-12 22:54pm

satrio_budidharmawan

Updated 17-Jun-12 22:58pm

v3

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exposed12 · Answer 1 · 2012-06-18T20:20:00

To enable the data for the angle, you have to write a certain Eventlistener and have to register it with the SensorManager class.

Java

public class myAngleClass extends Activity
{   
    
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);        

        SensorManager Manager = (SensorManager)
this.getSystemService(SENSOR_SERVICE);        

        final float[] mValuesMagnet      = new float[3];
        final float[] mValuesAccel       = new float[3];
        final float[] mValuesOrientation = new float[3];
        final float[] mRotationMatrix    = new float[9];

       
        final SensorEventListener mEventListener = new SensorEventListener() {
            public void onAccuracyChanged(Sensor sensor, int accuracy) {
            }

            public void onSensorChanged(SensorEvent event) {
               
                switch (event.sensor.getType()) {
                    case Sensor.TYPE_ACCELEROMETER:
                        System.arraycopy(event.values, 0, mValuesAccel, 0, 3);
                        break;

                    case Sensor.TYPE_MAGNETIC_FIELD:
                        System.arraycopy(event.values, 0, mValuesMagnet, 0, 3);
                        break;
                }
            };
        };

// Register the event listener
    public void regListeners(SensorManager Manager , SensorEventListener list)
    {
       Manager 
             .registerListener(list, Manager  
             .getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
                SensorManager.SENSOR_DELAY_NORMAL);


        Manager
              .registerListener(list, 
               sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), 
                SensorManager.SENSOR_DELAY_NORMAL);

    }
}