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POAndroid Paint PorterDuff.Mode.CLEAR
 

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    <p>I'm working on application which is drawing on Canvas similar to Finger Paint demo from Android SDK. My problem is when I'm using <code>PorterDuff.Mode.CLEAR</code>. When drawing and Canvas and if I try to erase something, it's working fine. But if I try to save my image as <code>PNG</code> file the strokes of eraser are coloured black, and I'm not sure why is this happening. Here is an example what I'm doing :</p> <pre><code>@Override protected void onDraw(Canvas canvas) { canvas.drawColor(Color.WHITE); canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); canvas.drawPath(mPath, mPaint); } </code></pre> <p>Eraser :</p> <pre><code>case ERASE_MENU_ID: mPaint.setXfermode(new PorterDuffXfermode( PorterDuff.Mode.CLEAR)); return true; </code></pre> <p>And how I'm saving the image :</p> <pre><code> Calendar currentDate = Calendar.getInstance(); SimpleDateFormat formatter= new SimpleDateFormat("yyyyMMMddHmmss"); String dateNow = formatter.format(currentDate.getTime()); File dir = new File(mImagePath); if(!dir.exists()) dir.mkdirs(); File file = new File(mImagePath + "/" + dateNow +".png"); FileOutputStream fos; try { fos = new FileOutputStream(file); mBitmap.compress(Bitmap.CompressFormat.PNG, 100, fos); fos.close(); Toast.makeText(getApplicationContext(), "File saved at \n"+mImagePath + "/" + dateNow +".png", Toast.LENGTH_LONG).show(); } catch (FileNotFoundException e) { Log.e("Panel", "FileNotFoundException", e); } catch (IOException e) { Log.e("Panel", "IOEception", e); } return true; </code></pre> <p>And here is an example of images :</p> <p>here is what my canvas looks like before saving :</p> <p><img src="https://i.stack.imgur.com/lSgRE.jpg" alt="enter image description here"></p> <p>and here is the image after saving it on sd card :</p> <p><img src="https://i.stack.imgur.com/Wxm2R.jpg" alt="enter image description here"></p>
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    1. COwhats the Bitmap.Config you are using? RGB_565 or RGBA_8888?
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    2. CO`Bitmap.Config.ARGB_8888`
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    3. COcan you show the code where you draw onto mBitmap right before you compress it? Also PortDuff clear means that the result color is 0 (black). Are you by chance setting the alpha of the paint to zero?
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