Rotated image in ImageView
I want to show an arrow that indicates the direction towards a goal, using the orien开发者_如何学编程tation 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);
here you can find a tutorial
http://www.anddev.org/resize_and_rotate_image_-_example-t621.html
There is a matrix parameter in the createBitmap method that can be used for resizing and rotating the image. You could try something like the following:
Matrix matrix = new Matrix();
// to rotate the image bitmap use post Rotate
matrix.postRotate(45);
Bitmap rotatedImage = Bitmap.createBitmap(bitmapOrg, 0, 0,
width, height, matrix, true); `
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