android - Grainy Markers with rotation in GoogleMaps -

i've create maps images using code:

icon_pin = bitmapfactory.decoderesource(getapplicationcontext().getresources(), r.drawable.arrow); int w = icon_pin.getwidth(); int h = icon_pin.getheight(); bitmap.config conf = bitmap.config.argb_8888;  bitmap bmp = bitmap.createbitmap(w, h, conf);    final float centerx = w / 2.0f; final float centery = h / 2.0f;  canvas canvas = new canvas(bmp); canvas.rotate(m.getdirection(), centerx, centery);  canvas.drawbitmap(icon_pin, new matrix(), null); 

but when rotated image, result grainy (like green arrow in example: http://img837.imageshack.us/img837/4624/screenshot2013052111381.png)

i've wrong something? it's possibile bettering definition?

it looks need draw anti-aliasing enabled. in line:

canvas.drawbitmap(icon_pin, new matrix(), null);

you can specify paint object use drawing. above, use null. can add these lines before call canvas.drawbitmap():

paint mypaint = new paint(paint.anti_alias_flag); mypaint.setfilterbitmap(true); 

then change last line to:

canvas.drawbitmap(icon_pin, new matrix(), mypaint);

this code creates new paint object anti-aliasing enabled, take out jagged edges on markers.

note: can use paint apply colors, alpha shading , other cool effects drawing. see android documentation here.