How do I draw an arrowhead (in Android)?

Question

I\'m fairly new to Android and have been toying around with Canvas. I\'m attempting to draw an arrow but I\'m only having luck with drawing the shaft, none of the arrowhead

Answer 1

I've been having the same problem, I need an arrow to point in a certain direction. After playing around with drawing algorithms I decided the simplest method is to use a bitmap & simply use a Matrix to rotate it, e.g.

ImageView image = (ImageView) findViewById(R.id.bitmap_image);
Bitmap bMap = BitmapFactory.decodeResource(getResources(), R.drawable.test);
Matrix mat = new Matrix();
mat.postRotate(90);
Bitmap bMapRotate = Bitmap.createBitmap(bMap, 0, 0, bMap.getWidth(), bMap.getHeight(), mat, true);
image.setImageBitmap(bMapRotate);

then your bitmap can be any fancy looking arrow you like.