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POHow to prevent Android's drawBitmap from only drawing black images?
 

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  1. POHow to prevent Android's drawBitmap from only drawing black images?
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    <p>As per the <a href="https://stackoverflow.com/questions/3567312/android-drop-shadow-on-view/3568992#3568992">original question</a>, The end result is a rounded-rect <code>png</code> in an <code>ImageView</code> with a natural looking drop shadow.</p> <p>I have the shadow working, but when it draws, it makes the entire image black.</p> <p><img src="https://i.stack.imgur.com/kZJF4.png" alt="alt text"></p> <p>How can I prevent the original image (definitely not black) from being black when adding the shadow?</p> <pre><code> BlurMaskFilter blurFilter = new BlurMaskFilter(2, BlurMaskFilter.Blur.OUTER); Paint shadowPaint = new Paint(); shadowPaint.setMaskFilter(blurFilter); int[] offsetXY = new int[2]; Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pier_t); Bitmap shadowImage = originalBitmap.extractAlpha(shadowPaint, offsetXY); Canvas c = new Canvas(shadowImage); c.drawBitmap(originalBitmap, -offsetXY[0], -offsetXY[1], null); imageView.setImageBitmap(shadowImage); </code></pre> <p><br/> <br/> <br/> <br/> <strong>UPDATE:</strong></p> <p>I implemented Josh's suggestion about copying over to the correct color space and now it works great! For future searchers, <strong>this code produces a drop shadow on an image view</strong>. You can play around with the x and y, as well as the OUTER constant to get the desired effect.</p> <pre><code>BlurMaskFilter blurFilter = new BlurMaskFilter(2, BlurMaskFilter.Blur.OUTER); Paint shadowPaint = new Paint(); shadowPaint.setMaskFilter(blurFilter); int[] offsetXY = new int[2]; Bitmap originalBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pier_t); Bitmap shadowImage = originalBitmap.extractAlpha(shadowPaint, offsetXY); Bitmap shadowImage32 = shadowImage.copy(Bitmap.Config.ARGB_8888, true); Canvas c = new Canvas(shadowImage32); c.drawBitmap(originalBitmap, -offsetXY[0], -offsetXY[1], null); imageView.setImageBitmap(shadowImage32); </code></pre> <p><img src="https://i.stack.imgur.com/bzBZW.png" alt="alt text"></p>
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    1. COAwesome! I'm glad all that effort paid off.
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    2. COWhat do I have to do to change the color of the shadow?
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