Android 安卓方向传感器

在观看摄像头预览时，您是否可以知道手机指向哪个方向，或者您是否需要将手机像指南针一样平放

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谢谢

是-下面的代码应该可以完成这项工作

public class Test extends Activity  implements SensorEventListener{

    public static float swRoll;
    public static float swPitch;
    public static float swAzimuth;


    public static SensorManager mSensorManager;
    public static Sensor accelerometer;
    public static Sensor magnetometer;

    public static float[] mAccelerometer = null;
    public static float[] mGeomagnetic = null;


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

    @Override
    public void onSensorChanged(SensorEvent event) {
        // onSensorChanged gets called for each sensor so we have to remember the values
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            mAccelerometer = event.values;
        }

        if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
            mGeomagnetic = event.values;
        }

        if (mAccelerometer != null && mGeomagnetic != null) {
            float R[] = new float[9];
            float I[] = new float[9];
            boolean success = SensorManager.getRotationMatrix(R, I, mAccelerometer, mGeomagnetic);

            if (success) {
                float orientation[] = new float[3];
                SensorManager.getOrientation(R, orientation);
                // at this point, orientation contains the azimuth(direction), pitch and roll values.
                  double azimuth = 180 * orientation[0] / Math.PI;
                  double pitch = 180 * orientation[1] / Math.PI;
                  double roll = 180 * orientation[2] / Math.PI;
            }
        }
    }



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
        accelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        magnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
    }

    @Override
    protected void onResume() {
        super.onResume();

        mSensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_GAME);
        mSensorManager.registerListener(this, magnetometer, SensorManager.SENSOR_DELAY_GAME);
    }

    @Override
    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(this, accelerometer);
        mSensorManager.unregisterListener(this, magnetometer);
    }
}

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您可以获得手机指向的方向，以及手机沿三轴传感器的旋转。所以你可以做任何你想做的事。我如何在日志中打印方向？？？？在哪个变量中获得方向？？？@Mitesh方位角值是您应该查看打印的值。Log.d（“方向”，String.valueOf（方位角））应该可以完成这项工作。@Richard：：谢谢..）@李察认为，如果用户使用相机和方向是在这种情况下计算的，那么方位值将只给出与原始值不同的值，因为当使用相机时，设备与地面不平行，因此我们还必须考虑其他值，以获得设备的实际方向。