refresh a bitmap or canvas in android

Question

hello guys,

can anybody tell me how to refresh or reset a bitmap or canvas to draw another image on it?

actually i have a map binary file which contains bitmap tiles in bytes now problem is i have a buffer image with buffer image i get screen image to display. so when i move my screen image i need to refresh my buffer image and draw new tiles to display on screen.

here is code to display image.

bitmap = Bitmap.createBitmap(screenWidth * (int)mapState.getiBufferMult(), screenHeight * (int)mapState.getiBufferMult(), Config.RGB_565); canvas = new Canvas(bitmap); image = new ImageView(this);

this is not full source but i hope you guys can have idea.

thanks a lot