Question

I want to show an arrow that indicates the direction towards a goal, using the orientation sensor and current GPS position. Everything works well, except that I want to rotate the arrow image in my ImageView.

The current code, which shows the arrow pointing upwards, is this:

ImageViewArrow.setImageResource(R.drawable.arrow);

What is the best solution for showing the arrow, rotated by N degrees?

I tried this, but it gave messed up graphics:

Matrix matrix = new Matrix(); 
matrix.postRotate(Rotation);
Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(), 
  R.drawable.arrow); 
Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
  bitmapOrg.getWidth(),bitmapOrg.getHeight(), matrix, true); 
BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);
InfoArrow.setScaleType(ScaleType.CENTER);
InfoArrow.setImageDrawable(bmd);

Answer 1

here you can find a tutorial

http://www.anddev.org/resize_and_rotate_image_-_example-t621.html