此代码从文件路径返回位图pdf第一页。

private Bitmap pdfToBitmap(File pdfFile) {
            Bitmap bitmap = null;
            try {
                PdfRenderer renderer = new PdfRenderer(ParcelFileDescriptor.open(pdfFile, ParcelFileDescriptor.MODE_READ_ONLY));
                final int pageCount = renderer.getPageCount();
                if(pageCount>0){
                    PdfRenderer.Page page = renderer.openPage(0);
                    int width = (int) (page.getWidth());
                    int height = (int) (page.getHeight());
                    bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

                    page.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
                    page.close();
                    renderer.close();
                }
            } catch (Exception ex) {
                ex.printStackTrace();
            }
            return bitmap;
        }