Tinting a map marker.

snippet.java

Bitmap markerBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.mapmarker);
Bitmap resultBitmap = Bitmap.createBitmap(markerBitmap, 0, 0, markerBitmap.getWidth() - 1, markerBitmap.getHeight() - 1);
ColorFilter filter = new PorterDuffColorFilter(Color.WHITE, PorterDuff.Mode.SRC_IN);

Paint markerPaint = new Paint();
markerPaint.setColorFilter(filter);

Canvas canvas = new Canvas(resultBitmap);
canvas.drawBitmap(resultBitmap, 0, 0, markerPaint);
markerOptions.icon(BitmapDescriptorFactory.fromBitmap(resultBitmap));