MarkerBitmapFactory.java 文件源码

public static Bitmap getMarkerWithHaloBitmap(Bitmap bitmap, int haloRadius, int haloColor) {
    if(2*haloRadius > bitmap.getWidth() || 2*haloRadius > bitmap.getHeight()){
        Paint paint = new Paint();
        Bitmap.Config bitmapConfig = Bitmap.Config.ARGB_8888;
        Bitmap newBitmap = Bitmap.createBitmap(2*haloRadius, 2*haloRadius, bitmapConfig);
        Canvas canvas = new Canvas(newBitmap);
        paint.setColor(haloColor);
        canvas.drawCircle(haloRadius,haloRadius,haloRadius,paint);
        canvas.drawBitmap(bitmap,haloRadius-bitmap.getWidth()/2,haloRadius-bitmap.getHeight()/2,null);
        return newBitmap;
    }
    return bitmap;
}