B4X:

```
private void setSurfaceOrientation(){
if (textureView == null) {
return;
} else try {
{
Matrix matrix = new Matrix();
int rotation = getWindowManager().getDefaultDisplay().getRotation();
RectF textureRectF = new RectF(0, 0, 640, 480);
RectF previewRectF = new RectF(0, 0, textureView.getHeight(), textureView.getWidth());
float centerX = textureRectF.centerX();
float centerY = textureRectF.centerY();
if (rotation == Surface.ROTATION_90 || rotation == Surface.ROTATION_270) {
previewRectF.offset(centerX - previewRectF.centerX(), centerY - previewRectF.centerY());
matrix.setRectToRect(textureRectF, previewRectF, Matrix.ScaleToFit.FILL);
float scale = Math.max((float) 640 / 640, (float) 480 / 640);
matrix.postScale(scale, scale, centerX, centerY);
matrix.postRotate(90 * (rotation - 2), centerX, centerY);
}
textureView.setTransform(matrix);
}
} catch (Exception e) {
e.printStackTrace();
}
}
```

Walter