Generate PDF with Android using PrintedPdfDocument and View.draw

Question

I have this layout and I would like to print everything on the screen in PDF format. including all content in the scroll view. I will also try to do this using IText later, but for now I want to see if I can do this using PrintedPdfDocument and View.draw. That I created the PDF, but only part of the layout is visible in the PDF.

Full project included: https://github.com/ammar5001/PrintPDF2

Here is the layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" android:id="@+id/relativeLayout"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Title" android:id="@+id/textView" android:textSize="24dp" android:textStyle="bold" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textView2" android:text="Auther Name\nTitle\nContacts" android:textSize="16dp" android:layout_below="@+id/textView" android:layout_alignParentStart="true" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Some Company\nStreet Address\nCity, State\nzip code" android:id="@+id/textView3" android:layout_below="@+id/textView" android:layout_alignParentEnd="true" android:textSize="16dp" android:layout_marginBottom="10dp" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Print PDF" android:id="@+id/button1" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:onClick="printPDF" /> <ScrollView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/scrollView" android:layout_below="@id/textView3" android:layout_above="@id/button1" android:layout_marginTop="10dp"> <LinearLayout android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="For some applications, such as drawing apps, page layout apps and other apps that focus on graphic output, creating beautiful printed pages is a key feature. In this case, it is not enough to print an image or an HTML document. The print output for these types of applications requires precise control of everything that goes into a page, including fonts, text flow, page breaks, headers, footers, and graphic elements." android:id="@+id/textView4" android:layout_marginBottom="10dp" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Creating print output that is completely customized for your application requires more programming investment than the previously discussed approaches. You must build components that communicate with the print framework, adjust to printer settings, draw page elements and manage printing on multiple pages. This lesson shows you how you connect with the print manager, create a print adapter and build content for printing." android:id="@+id/textView5" android:layout_marginBottom="10dp"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="When your application manages the printing process directly, the first step after receiving a print request from your user is to connect to the Android print framework and obtain an instance of the PrintManager class. This class allows you to initialize a print job and begin the printing lifecycle. The following code example shows how to get the print manager and start the printing process" android:id="@+id/textView6" android:layout_marginBottom="10dp"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="The example code above demonstrates how to name a print job and set an instance of the PrintDocumentAdapter class which handles the steps of the printing lifecycle. The implementation of the print adapter class is discussed in the next section." android:id="@+id/textView7" android:layout_marginBottom="10dp"/> </LinearLayout> </ScrollView> </RelativeLayout> 

and here is the method I use:

  public void printPDF(View view){ if(isExternalStorageWritable()) { String filename = getFileName(); File file = new File(getAlbumStorageDir("PDF"), filename); try { FileOutputStream outputStream = new FileOutputStream(file); createPDF(outputStream); } catch (IOException e) { e.printStackTrace(); Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show(); } } } private void createPDF(FileOutputStream outputStream) throws IOException { PrintedPdfDocument document = new PrintedPdfDocument(this, getPrintAttributes()); // start a page PdfDocument.Page page = document.startPage(1); // draw something on the page View content = getContentView(); content.draw(page.getCanvas()); // finish the page document.finishPage(page); //. . . // add more pages //. . . // write the document content document.writeTo(outputStream); //close the document document.close(); } private View getContentView() { return findViewById(R.id.relativeLayout); } 

Answer 1

The workaround should be to create a bitmap of the size of the view, place it on the canvas and go to View.draw (). Then you can scale the bitmap and draw it on pdf canvas. You can even split it into several pages.

Keep in mind that representation is measured in pixels, while the size of the PDF canvas is in pixels or 1/72 of an inch.

Tomorrow I will add the code to my answer.

EDIT: Here is some working code to get some kind of PDF or printer view:

 public void printPDF(View view) { PrintManager printManager = (PrintManager) getSystemService(PRINT_SERVICE); printManager.print("print_any_view_job_name", new ViewPrintAdapter(this, findViewById(R.id.relativeLayout)), null); } public class ViewPrintAdapter extends PrintDocumentAdapter { private PrintedPdfDocument mDocument; private Context mContext; private View mView; public ViewPrintAdapter(Context context, View view) { mContext = context; mView = view; } @Override public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras) { mDocument = new PrintedPdfDocument(mContext, newAttributes); if (cancellationSignal.isCanceled()) { callback.onLayoutCancelled(); return; } PrintDocumentInfo.Builder builder = new PrintDocumentInfo .Builder("print_output.pdf") .setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT) .setPageCount(1); PrintDocumentInfo info = builder.build(); callback.onLayoutFinished(info, true); } @Override public void onWrite(PageRange[] pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) { // Start the page PdfDocument.Page page = mDocument.startPage(0); // Create a bitmap and put it a canvas for the view to draw to. Make it the size of the view Bitmap bitmap = Bitmap.createBitmap(mView.getWidth(), mView.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); mView.draw(canvas); // create a Rect with the view dimensions. Rect src = new Rect(0, 0, mView.getWidth(), mView.getHeight()); // get the page canvas and measure it. Canvas pageCanvas = page.getCanvas(); float pageWidth = pageCanvas.getWidth(); float pageHeight = pageCanvas.getHeight(); // how can we fit the Rect src onto this page while maintaining aspect ratio? float scale = Math.min(pageWidth/src.width(), pageHeight/src.height()); float left = pageWidth / 2 - src.width() * scale / 2; float top = pageHeight / 2 - src.height() * scale / 2; float right = pageWidth / 2 + src.width() * scale / 2; float bottom = pageHeight / 2 + src.height() * scale / 2; RectF dst = new RectF(left, top, right, bottom); pageCanvas.drawBitmap(bitmap, src, dst, null); mDocument.finishPage(page); try { mDocument.writeTo(new FileOutputStream( destination.getFileDescriptor())); } catch (IOException e) { callback.onWriteFailed(e.toString()); return; } finally { mDocument.close(); mDocument = null; } callback.onWriteFinished(new PageRange[]{new PageRange(0, 0)}); } }