ImageView not showing image from bitmap created by PDFRenderer on Android API 29

Question

I have a PDF that I want to show in an ImageView. It's showing on API 24-28 but no image shows on API 29. I think the issue may be the bitmap created by the PDFRenderer.

I put a breakpoint after the .render method and (in the debugger) clicked "View Bitmap" here:

On API 29, I sometimes get the image, and sometimes I get this error:

Error while evaluating expression, Object has been collected

On API 24-28, I do not get this error. I always get the image.

Below is the sample code:

        File file = new File(getExternalFilesDir(null), "fileName.pdf");
        PdfRenderer renderer = new PdfRenderer(ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY));
        if (currentPage < 0) {
            currentPage = 0;
        } else if (currentPage > renderer.getPageCount()) {
            currentPage = renderer.getPageCount() - 1;
        }
        Bitmap bitmap = Bitmap.createBitmap(800, 1000, Bitmap.Config.ARGB_8888);
        Rect rect = new Rect(0, 0, 800, 1000);
        PdfRenderer.Page page = renderer.openPage(currentPage);
        page.render(bitmap, rect, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
        page.close();
        renderer.close();
        image.setImageBitmap(bitmap);
        image.invalidate();

Does anyone know why the image is always showing on API 24-28 but not on API 29?

Answer 1

I ran into this on API 30 also. It looks garbage collection may be more aggressive now for bitmaps. I solved this by changing the scope of the problem bitmap from private to public and setting it to null when the relevant view is destroyed.