MainActivity.java

package com.example.pdfshare;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import android.app.Activity;
import android.content.Intent;
import android.graphics.pdf.PdfDocument;
import android.graphics.pdf.PdfDocument.Page;
import android.graphics.pdf.PdfDocument.PageInfo;
import android.net.Uri;
import android.os.Bundle;
import android.print.PrintAttributes;
import android.print.PrintAttributes.Margins;
import android.print.PrintAttributes.Resolution;
import android.print.pdf.PrintedPdfDocument;
import android.support.v4.content.FileProvider;
import android.view.Menu;
import android.view.View;


public class MainActivity extends Activity implements Runnable {

	private Intent mShareIntent;
	
	private OutputStream os;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	}

	/** PDF Gen should run in own thread to not slow the GUI */
	public void makeAndSharePDF(View buttonSource) {
		new Thread(this).start();
	}	
		
	public void run() {
		
		// Create a shiny new (but blank) PDF document in memory
		// We want it to optionally be printable, so add PrintAttributes
		// and use a PrintedPdfDocument. Simpler: new PdfDocument().
		PrintAttributes printAttrs = new PrintAttributes.Builder().
				setColorMode(PrintAttributes.COLOR_MODE_COLOR).
				setMediaSize(PrintAttributes.MediaSize.NA_LETTER).
				setResolution(new Resolution("zooey", PRINT_SERVICE, 300, 300)).
				setMinMargins(Margins.NO_MARGINS).
				build();
		PdfDocument document = new PrintedPdfDocument(this, printAttrs);

		// crate a page description
		PageInfo pageInfo = new PageInfo.Builder(300, 300, 1).create();

		// create a new page from the PageInfo
		Page page = document.startPage(pageInfo);

		// repaint the user's text into the page
		View content = findViewById(R.id.textArea);
		content.draw(page.getCanvas());

		// do final processing of the page
		document.finishPage(page);

		// Here you could add more pages in a longer doc app, but you'd have
		// to handle page-breaking yourself in e.g., write your own word processor...

		// Now write the PDF document to a file; it actually needs to be a file
		// since the Share mechanism can't accept a byte[]. though it can
		// accept a String/CharSequence. Meh.
		try {
			File pdfDirPath = new File(getFilesDir(), "pdfs");
			pdfDirPath.mkdirs();
			File file = new File(pdfDirPath, "pdfsend.pdf");
			Uri contentUri = FileProvider.getUriForFile(this, "com.example.fileprovider", file);
			os = new FileOutputStream(file);
			document.writeTo(os);
			document.close();
			os.close();
			
			shareDocument(contentUri);
		} catch (IOException e) {
			throw new RuntimeException("Error generating file", e);
		}
	}

	private void shareDocument(Uri uri) {
		mShareIntent = new Intent();
		mShareIntent.setAction(Intent.ACTION_SEND);
		mShareIntent.setType("application/pdf");
		// Assuming it may go via eMail:
		mShareIntent.putExtra(Intent.EXTRA_SUBJECT, "Here is a PDF from PdfSend");
		// Attach the PDf as a Uri, since Android can't take it as bytes yet.
		mShareIntent.putExtra(Intent.EXTRA_STREAM, uri);
		startActivity(mShareIntent);
		return;
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
}