Android SensorManager strange how to remapCoordinateSystem

Question

API Demos -> Graphics -> Compass

It works properly only, until you don\'t change the device natural orientation. In most phones is the portrait and most 10 inch tabl

Answer 1

This is how I do the magic in my application:

        float[] rotationMatrixOrig = new float[9];
        SensorManager.getRotationMatrix(rotationMatrixOrig, null, lastAccelerometerValue, lastMagnetometerValue);

        int screenRotation = app.getCurrentActivity().getWindowManager().getDefaultDisplay().getRotation();
        int axisX, axisY;
        boolean isUpSideDown = lastAccelerometerValue[2] < 0;

        switch (screenRotation) {
            case Surface.ROTATION_0:
                axisX = (isUpSideDown ? SensorManager.AXIS_MINUS_X : SensorManager.AXIS_X);
                axisY = (Math.abs(lastAccelerometerValue[1]) > 6.0f ? 
                        (isUpSideDown ? SensorManager.AXIS_MINUS_Z : SensorManager.AXIS_Z) :
                        (isUpSideDown ? SensorManager.AXIS_MINUS_Y : SensorManager.AXIS_Y));
                break;
            case Surface.ROTATION_90:
                axisX = (isUpSideDown ? SensorManager.AXIS_MINUS_Y : SensorManager.AXIS_Y);
                axisY = (Math.abs(lastAccelerometerValue[0]) > 6.0f ? 
                        (isUpSideDown ? SensorManager.AXIS_Z : SensorManager.AXIS_MINUS_Z) :
                        (isUpSideDown ? SensorManager.AXIS_X : SensorManager.AXIS_MINUS_X));
                break;
            case  Surface.ROTATION_180:
                axisX = (isUpSideDown ? SensorManager.AXIS_X : SensorManager.AXIS_MINUS_X);
                axisY = (Math.abs(lastAccelerometerValue[1]) > 6.0f ? 
                        (isUpSideDown ? SensorManager.AXIS_Z : SensorManager.AXIS_MINUS_Z) :
                        (isUpSideDown ? SensorManager.AXIS_Y : SensorManager.AXIS_MINUS_Y));
                break;
            case Surface.ROTATION_270:
                axisX = (isUpSideDown ? SensorManager.AXIS_Y : SensorManager.AXIS_MINUS_Y);
                axisY = (Math.abs(lastAccelerometerValue[0]) > 6.0f ? 
                        (isUpSideDown ? SensorManager.AXIS_MINUS_Z : SensorManager.AXIS_Z) :
                        (isUpSideDown ? SensorManager.AXIS_MINUS_X : SensorManager.AXIS_X));
                break;
            default:
                axisX = (isUpSideDown ? SensorManager.AXIS_MINUS_X : SensorManager.AXIS_X);
                axisY = (isUpSideDown ? SensorManager.AXIS_MINUS_Y : SensorManager.AXIS_Y);
        }

        float[] rotationMatrix = new float[9];
        SensorManager.remapCoordinateSystem(rotationMatrixOrig, axisX, axisY, rotationMatrix);