问从RecyclerView的全部内容创建PDF？

EN

String documentName = "yourDocumentName"; // you can provide any name

// Get a PrintManager instance
PrintManager printManager = (PrintManager) context.getSystemService(PRINT_SERVICE);

// Get a print adapter instance
PrintDocumentAdapter printAdapter = webView.createPrintDocumentAdapter(documentName);

PrintJob printJob = printManager.print(documentName, printAdapter, new PrintAttributes.Builder().build());

Bitmap recycler_view_bm =     getScreenshotFromRecyclerView(mRecyclerView);

        try {

            pdfFile.createNewFile();
            FileOutputStream fOut = new FileOutputStream(pdfFile);

            PdfDocument document = new PdfDocument();
            PdfDocument.PageInfo pageInfo = new
                    PdfDocument.PageInfo.Builder(recycler_view_bm.getWidth(), recycler_view_bm.getHeight(), 1).create();
            PdfDocument.Page page = document.startPage(pageInfo);
            recycler_view_bm.prepareToDraw();
            Canvas c;
            c = page.getCanvas();
           c.drawBitmap(recycler_view_bm,0,0,null);
            document.finishPage(page);
            document.writeTo(fOut);
            document.close();
            Snackbar snackbar = Snackbar
                    .make(equipmentsRecordActivityLayout, "PDF generated successfully.", Snackbar.LENGTH_LONG)
                    .setAction("Open", new View.OnClickListener() {
                        @Override
                        public void onClick(View view) {
                          openPDFRecord(pdfFile);
                        }
                    });

            snackbar.show();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public Bitmap getScreenshotFromRecyclerView(RecyclerView view) {
        RecyclerView.Adapter adapter = view.getAdapter();
        Bitmap bigBitmap = null;
        if (adapter != null) {
            int size = adapter.getItemCount();
            int height = 0;
            Paint paint = new Paint();
            int iHeight = 0;
            final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

            // Use 1/8th of the available memory for this memory cache.
            final int cacheSize = maxMemory / 8;
            LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
            for (int i = 0; i < size; i++) {
                RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
                adapter.onBindViewHolder(holder, i);
                holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
                        View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
                holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
                holder.itemView.setDrawingCacheEnabled(true);
                holder.itemView.buildDrawingCache();
                Bitmap drawingCache = holder.itemView.getDrawingCache();
                if (drawingCache != null) {

                    bitmaCache.put(String.valueOf(i), drawingCache);
                }

                height += holder.itemView.getMeasuredHeight();
            }

            bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
            Canvas bigCanvas = new Canvas(bigBitmap);
            bigCanvas.drawColor(Color.WHITE);

            for (int i = 0; i < size; i++) {
                Bitmap bitmap = bitmaCache.get(String.valueOf(i));
                bigCanvas.drawBitmap(bitmap, 0f, iHeight, paint);
                iHeight += bitmap.getHeight();
                bitmap.recycle();
            }

        }
        return bigBitmap;
    }

  //create bitmap from view and returns it
private Bitmap getBitmapFromView(View view) {
    ScrollView hsv = (ScrollView) findViewById(R.id.scrollViewP);
    HorizontalScrollView horizontal = (HorizontalScrollView) findViewById(R.id.hsv);
    int totalHeight = hsv.getChildAt(0).getHeight();
    int totalWidth = horizontal.getChildAt(0).getWidth();
    Bitmap returnedBitmap = Bitmap.createBitmap(totalWidth, totalHeight,Bitmap.Config.ARGB_8888);
    //Bind a canvas to it
    Canvas canvas = new Canvas(returnedBitmap);
    //Get the view's background
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null) {
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    }   else{
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    }
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return returnedBitmap;
}
private static void addImage(Document document,byte[] byteArray)
{
    Image image = null;
    try
    {
        image = Image.getInstance(byteArray);
    }
    catch (BadElementException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    catch (MalformedURLException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    catch (IOException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // image.scaleAbsolute(150f, 150f);
    try
    {
        document.add(image);
    } catch (DocumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}
public void CreatePDF()
{

    File folder = new File(Environment.getExternalStorageDirectory()+File.separator+"PDF Folder");
    folder.mkdirs();

   Date date = new Date() ;
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(date);

   final File myFile = new File(folder + timeStamp + ".pdf");
    try {
        OutputStream output  = new FileOutputStream(myFile);
        Document document = new Document(PageSize.A4);
        try{
            PdfWriter.getInstance(document, output);
            document.open();
          LinearLayout view2 = (LinearLayout)findViewById(R.id.MainLayout);

            view2.setDrawingCacheEnabled(true);
            Bitmap screen2= getBitmapFromView(view2);
            ByteArrayOutputStream stream2 = new ByteArrayOutputStream();
            screen2.compress(Bitmap.CompressFormat.JPEG,100, stream2);
            byte[] byteArray2 = stream2.toByteArray();
            addImage(document,byteArray2);

                document.close();
                AlertDialog.Builder builder =  new AlertDialog.Builder(PaySlip.this, R.style.AppCompatAlertDialogStyle);
                builder.setTitle("Success")
                        .setMessage("enter code herePDF File Generated Successfully.")
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setPositiveButton(android.R.string.ok,new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton)
                            {
                                Intent intent = new Intent(Intent.ACTION_VIEW);
                                intent.setDataAndType(Uri.fromFile(myFile), "application/pdf");
                                intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                                startActivity(intent);
                            }

                        }).show();

            //document.add(new Paragraph(mBodyEditText.getText().toString()));
        }catch (DocumentException e)
        {
            //loading.dismiss();
            e.printStackTrace();
        }

    }catch (FileNotFoundException e)
    {
       // loading.dismiss();
      e.printStackTrace();
    }


}