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I was creating a printdocumentadapter class to generate pdf to print. I needed to automatically calculate how many pages I was going to need based off my data variable(which is just a string containing texts). So I needed to find out the width and height of my canvas in pixels or dp before I actually instantiate the canvas object in my onwrite method. Here is the class file:

public class CustomPrintDocumentAdapter extends PrintDocumentAdapter 

private Activity cur;

private int pageCount = 1;

private PrintedPdfDocument pdf;

private String data;

private int textSize = 16;

public CustomPrintDocumentAdapter(Activity current, String data)
 this.cur = current;
 this.data = data;


@Override
public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes, CancellationSignal cancellationSignal, LayoutResultCallback callback, Bundle extras) 
 pdf = new PrintedPdfDocument(cur,newAttributes);
 if(cancellationSignal.isCanceled())
 callback.onLayoutCancelled();
 

 PrintDocumentInfo info = new PrintDocumentInfo.Builder("print_output.pdf").setContentType(PrintDocumentInfo.CONTENT_TYPE_DOCUMENT).setPageCount(pageCount).build();

 callback.onLayoutFinished(info,true);


@Override
public void onWrite(PageRange pages, ParcelFileDescriptor destination, CancellationSignal cancellationSignal, WriteResultCallback callback) 
 PdfDocument.Page page = pdf.startPage(1);
 drawPage(page);
 pdf.finishPage(page);

 try
 pdf.writeTo(new FileOutputStream(destination.getFileDescriptor()));
 catch(IOException ie)
 callback.onWriteFailed(ie.toString());
 finally
 pdf.close();
 

 callback.onWriteFinished(pages);


public void drawPage(PdfDocument.Page page)

 Canvas canvas = page.getCanvas();
 TextPaint paint = new TextPaint();
 paint.setColor(Color.BLACK);
 paint.setTextSize(16);
 StaticLayout.Builder.obtain(data,0,data.length(),paint,canvas.getWidth()).build().draw(canvas);

 Log.d("CustomPrintDocumentAdapter","Canvas width in pixels: "+canvas.getWidth());
 //prints D/CustomPrintDocumentAdapter: Canvas width in pixels: 590
 //Canvas width in pixel is 590px????
 //my screen is only 480 pixels wide yet the canvas displayed is smaller than my screen??

So my question is how do I find the width and height of my canvas object in pixels in my onLayout method?

I am planning on making the canvas fill the entire area on the paper (Any size).