create shadow for bitmap in custom view

Question

I have a custom view wich contain some bitmaps and I want to set shadows for them, for that, I use this code:

shadowPaints=new Paint(Paint.ANTI_ALIAS_FLAG);
shadowPaints.setShadowLayer(10.0f, 3.0f, 2.0f, Color.BLACK);
canvas.drawBitmap(bmp, matrix, shadowPaints);   
setLayerType(LAYER_TYPE_SOFTWARE, shadowPaints);

and my result is as you can see my shadow actually is another bitmap with different x and y position but what I want is my shadow be a solid color bitmap.
can anyone help me about this?

thanks for your attention. it's too huge in code but if you show me a way that work in simple custom view im sure it will work on my customview too. — max, Jul 21 '16 at 14:30

score 1 · Accepted Answer · edited May 23 '17 at 11:44

setShadowLayer is actually meant for putting shadows on text.

If you already know the bitmap you want to draw, you can just add a shadow in PhotoShop and draw the bitmap and shadow all at once.

If you don't want to do that, you could make a shadow by making a copy of the image, using a PorterDuff filter to make it all grey, use Renderscript to blur the image, and draw it on the canvas at an x,y offset before drawing the actual image on top of it.

Personally, I think PhotoShop is a lot easier.

create shadow for bitmap in custom view

1 Answers1