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POandroid Picture.createFromStream does not reload bitmaps
 

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  1. POandroid Picture.createFromStream does not reload bitmaps
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    <p>On android I am drawing into a android.graphics.Picture then save the Picture to a file. Later I reload the picture into memory and draw it to the canvas. I noticed that Bitmaps were never drawing. And after much debugging I managed to narrow down the problem to Picture.writeToStream and Picture.createFromStream. It seems that Bitmaps drawn into the picture don't get reloaded properly. Below is sample code I wrote to show the problem. In this sample my canvas is not hardware accelerated.</p> <p>So my questions are as follows:</p> <ol> <li>Am I doing something wrong?</li> <li>Is this an Android bug? I filed the bug report <a href="https://code.google.com/p/android/issues/detail?id=54896" rel="nofollow">https://code.google.com/p/android/issues/detail?id=54896</a> because I think this is.</li> <li><p>Any known workaround?</p> <pre><code>@Override protected void onDraw(Canvas canvas) { try { Picture picture = new Picture(); // Create a bitmap Bitmap bitmap = Bitmap.createBitmap( 100, 100, Config.ARGB_8888); Canvas bitmapCanvas = new Canvas(bitmap); bitmapCanvas.drawARGB(255, 0, 255, 0); // Draw the bitmap to the picture's canvas. Canvas pictureCanvas = picture.beginRecording(canvas.getWidth(), canvas.getHeight()); RectF dstRect = new RectF(0, 0, 200, 200); pictureCanvas.drawBitmap(bitmap, null, dstRect, null); picture.endRecording(); // Save the Picture to a file. File file = File.createTempFile("cache", ".pic"); FileOutputStream os = new FileOutputStream(file); picture.writeToStream(os); os.close(); // Read the picture back in FileInputStream in = new FileInputStream(file); Picture cachedPicture = Picture.createFromStream(in); // Draw the cached picture to the view's canvas. This won't draw the bitmap! canvas.drawPicture(cachedPicture); // Uncomment the following line to see that Drawing the Picture without reloading // it from disk works fine. //canvas.drawPicture(picture); } catch (Exception e) { } } </code></pre></li> </ol>
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