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POStoring A Modified Bitmap To Disk
 

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  1. POStoring A Modified Bitmap To Disk
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    <p>The project I am working on requires rounded corners (yes a copy from the iphone unfortunately). I round the corners when the image is downloaded then it is displayed. Here is how I round the corners...</p> <pre><code>public class ImageRounder { private Paint paint = new Paint(); private Canvas canvas; private Rect rect; private RectF rectF; final int color = 0xff424242; @Inject public ImageRounder() {} public synchronized Bitmap getRoundedCornerBitmap(Bitmap bitmap, int pixels) { Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap .getHeight(), Bitmap.Config.ARGB_8888); canvas = new Canvas(output); paint.reset(); rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight()); rectF = new RectF(rect); float roundPx = pixels; paint.setAntiAlias(true); canvas.drawARGB(0, 0, 0, 0); paint.setColor(Color.BLACK); canvas.drawRoundRect(rectF, roundPx, roundPx, paint); paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN)); canvas.drawBitmap(bitmap, rect, rect, paint); return output; } } </code></pre> <p>I also save the images to disk so I don't have to download it more than onces. This is how I save and retrieve the image</p> <pre><code>@Override public synchronized void saveImage(String id, Bitmap bitmap) throws FileNotFoundException { FileOutputStream outputStream = context.openFileOutput(id, Context.MODE_PRIVATE); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream); } @Override public synchronized Bitmap getImage(String id) throws FileNotFoundException { return BitmapFactory.decodeStream(context.openFileInput(id)); } </code></pre> <p>The problem is when I retrieve the image from disk it looks like this...</p> <p><img src="https://i.stack.imgur.com/hist5.jpg" alt="enter image description here"></p> <p>Its hard to tell me the corners are rounded but the background is black. I have tried setting the background of the imageview to both white and transparent but the corners still show as black.</p> <p>Does anybody know why this is?</p>
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