private Region createRotatedRegion(TextView textView){
Matrix matrix = new Matrix();
matrix.setRotate(textView.getRotation(), textView.getX() + textView.getMeasuredWidth() / 2, textView.getY() + textView.getMeasuredHeight() / 2);
Path path = new Path();
Point LT = rotatePoint(matrix, textView.getX(), textView.getY());
Point RT = rotatePoint(matrix, textView.getX() + textView.getMeasuredWidth(), textView.getY());
Point RB = rotatePoint(matrix, textView.getX() + textView.getMeasuredWidth(), textView.getY() + textView.getMeasuredHeight());
Point LB = rotatePoint(matrix, textView.getX(), textView.getY() + textView.getMeasuredHeight());
path.moveTo(LT.x, LT.y);
path.lineTo(RT.x, RT.y);
path.lineTo(RB.x, RB.y);
path.lineTo(LB.x, LB.y);
Region region = new Region();
region.setPath(path, new Region(0, 0, textViewParent.getWidth(), textViewParent.getHeight()));
return region;
}
private Point rotatePoint(Matrix matrix, float x, float y){
float[] pts = new float[2];
pts[0] = x;
pts[1] = y;
matrix.mapPoints(pts);
return new Point((int)pts[0], (int)pts[1]);
}