How to make glow effect around a bitmap?

The following code is what I got so far. However, there are 2 issues:

1. 
   

   
   I want both inner and outer glow effects, which looking similar to the Photoshop's blending options. But I only managed to make the outer glow, if I set BlurMaskFilter.Blur.INNER or other value, the whole image is blocked, instead of just edges.
   

   
   


2. 
   

   
   Despite I set "FF" as alpha value, the glow color is still very dark.
   

   
   

   
   
   
   Bitmap alpha = origin.extractAlpha();
   
   BlurMaskFilter blurMaskFilter = new BlurMaskFilter(5, BlurMaskFilter.Blur.OUTER);
   
   
   
   
   
   Paint paint = new Paint();
   
   paint.setMaskFilter(blurMaskFilter);
   
   paint.setColor(0xffffffff);
   
   
   
   
   
   Canvas canvas = new Canvas(origin);
   
   canvas.drawBitmap(alpha, 0, 0, paint);
   
   
   
   
   
   return origin;
   
   
   
   

   
   

Source: Tips4all