Android中產生PDF

iText 是java和C#中的一個處理PDF的開源類庫，國外的大牛已經把它移植到Android上了，但是直接拿來用還是需要花費一點功夫，下面就用一個簡單的demo來測試一下。

iText項目地址：https://code.google.com/p/droidtext/

首先用過svn把代碼check下來，終端運行

svn checkout http://droidtext.googlecode.com/svn/trunk/ droidtext-read-only

得到三個檔案夾，droidText是一個android的庫工程，droidTextTest是測試工程。

在eclipse中匯入droidText項目。這是個library project，後面建立的項目需要引用到。

然後建立一個Android工程-iTextTest

在工程中引用droidText：

Project->properties->Android->LIbrary:ADD

連結好之後就像。

主介面就一個Button，按下之後就開始生產PDF。

package com.example.itexttest;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.PrintStream;import java.lang.reflect.Method;import android.os.Bundle;import android.os.Environment;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.Toast;public class ITextActivity extends Activity {private Button mButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_itext);mButton = (Button)findViewById(R.id.button1);mButton.setOnClickListener(new OnClickListenerImpl());}private class OnClickListenerImpl implements View.OnClickListener{@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stub//Toast.makeText(getApplicationContext(), "Run", Toast.LENGTH_SHORT).show();// Create droidtext directory for storing resultsFile file = new File(android.os.Environment.getExternalStorageDirectory()+ File.separator + "iTextTest");if (!file.exists()) {file.mkdir();}System.out.println("Click!");Thread t = new Thread() {public void run() {int success = 0;int count = 1;String className = "com.example.itexttest.HelloWprld";String result = null;try {// Set output streams to bytearray streams so we can// display the output of examplesByteArrayOutputStream bos = new ByteArrayOutputStream();PrintStream errorStream = new PrintStream(bos, true);System.setErr(errorStream);ByteArrayOutputStream bos2 = new ByteArrayOutputStream();PrintStream outStream = new PrintStream(bos2, true);System.setOut(outStream);// Find the main methodClass<?> c = Class.forName(className);Method main = c.getDeclaredMethod("main",String[].class);System.out.println("GetMain"+main.getName());// Emulate CLI parameters if necessaryString[] params = null;if (className.equals("com.lowagie.examples.objects.tables.pdfptable.FragmentTable")) {params = new String[] { "3" };} else if (className.equals("com.lowagie.examples.objects.images.tiff.OddEven")) {params = new String[] { "odd.tif", "even.tif","odd_even.tiff" };} else if (className.equals("com.lowagie.examples.objects.images.tiff.Tiff2Pdf")) {params = new String[] { "tif_12.tif" };} else if (className.equals("com.lowagie.examples.objects.images.DvdCover")) {params = new String[] { "dvdcover.pdf", "Title","0xff0000", "hitchcock.png" };} else if (className.equals("com.lowagie.examples.forms.ListFields")) {params = new String[] {};} else if (className.equals("com.lowagie.examples.general.read.Info")) {params = new String[] { "RomeoJuliet.pdf" };} else if (className.equals("com.lowagie.examples.objects.anchors.OpenApplication")) {params = new String[] { "" };}main.invoke(null, (Object) params);// Parse resultsString string = new String(bos.toByteArray());String string2 = new String(bos2.toByteArray());if (string.length() > 0) {result = "Failed: " + string;} else if (string2.contains("Exception")) {result = "Failed: " + string2;} else if ("Images.pdf" != null) {File pdf = new File(Environment.getExternalStorageDirectory()+ File.separator + "iTextTest"+ File.separator+ "Images.pdf");System.out.println("Create Pdf@");if (!pdf.exists()) {result = "Failed: Resulting pdf didn't get created";} else if (pdf.length() <= 0) {result = "Failed: Resulting pdf is empty";} else {success++;result = "Successful";}} else {success++;result = "Successful";}} catch (Exception e) {result = "Failed with exception: "+ e.getClass().getName() + ": "+ e.getMessage();System.out.println(result);}if (result.startsWith("Failed")) {System.out.println("Failed!");} else {System.out.println("Success!");}System.out.println(result);}};t.start();}}}

OnClick裡面的代碼有點小複雜，要用的的話直接粘就可以了，注意修改相應的變數名,classname對應對就是操作itext生產pdf的類。

在包裡面再建立兩個測試類別：

HelloWorld.java

package com.example.itexttest;import java.io.FileOutputStream;import java.io.IOException;import com.lowagie.text.Document;import com.lowagie.text.DocumentException;import com.lowagie.text.Paragraph;import com.lowagie.text.pdf.PdfWriter;/** * Generates a simple 'Hello World' PDF file. *  * @author blowagie */public class HelloWorld {        /**         * Generates a PDF file with the text 'Hello World'         *          * @param args         *            no arguments needed here         */        public static void main(String[] args) {                System.out.println("Hello World");                // step 1: creation of a document-object                Document document = new Document();                try {                        // step 2:                        // we create a writer that listens to the document                        // and directs a PDF-stream to a file                        PdfWriter.getInstance(document, new FileOutputStream(android.os.Environment.getExternalStorageDirectory() + java.io.File.separator + "iTextTest" + java.io.File.separator + "HelloWorld.pdf"));                        // step 3: we open the document                        document.open();                        // step 4: we add a paragraph to the document                        document.add(new Paragraph("Hello World"));                } catch (DocumentException de) {                        System.err.println(de.getMessage());                } catch (IOException ioe) {                        System.err.println(ioe.getMessage());                }                // step 5: we close the document                document.close();        }}

生產Pdf如下：

Rotating.java（建立圖片，並旋轉）

注意再sdcard的根目錄裡面放一張圖片，改名jxk_run.png。

/* * $Id: Rotating.java 3373 2008-05-12 16:21:24Z xlv $ * * This code is part of the 'iText Tutorial'. * You can find the complete tutorial at the following address: * http://itextdocs.lowagie.com/tutorial/ * * This code is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * itext-questions@lists.sourceforge.net */package com.example.itexttest;import java.io.ByteArrayOutputStream;import java.io.FileOutputStream;import java.io.IOException;import com.example.itexttest.R;import com.example.itexttest.ITextActivity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import com.lowagie.text.Document;import com.lowagie.text.DocumentException;import com.lowagie.text.Image;import com.lowagie.text.Paragraph;import com.lowagie.text.pdf.PdfWriter;/** * Rotating images. */public class Rotating {/** * Rotating images. *  * @param args *            No arguments needed */public static void main(String[] args) {System.out.println("Rotating an Image");// step 1: creation of a document-objectDocument document = new Document();try {// step 2:// we create a writer that listens to the document// and directs a PDF-stream to a filePdfWriter.getInstance(document, new FileOutputStream(android.os.Environment.getExternalStorageDirectory() + java.io.File.separator +  "iTextTest"  + java.io.File.separator + "rotating.pdf"));// step 3: we open the documentdocument.open();// step 4: we add content//Can't use filename => use byte[] instead//Image jpg4 = Image.getInstance("otsoe.jpg");ByteArrayOutputStream stream = new ByteArrayOutputStream();//Bitmap bitmap = BitmapFactory.decodeResource(ITextActivity.getActivity().getResources(), R.drawable.otsoe);Bitmap bitmap = BitmapFactory.decodeFile("/mnt/sdcard/jxk_run.png");bitmap.compress(Bitmap.CompressFormat.JPEG /* FileType */,100 /* Ratio */, stream);Image jpg = Image.getInstance(stream.toByteArray());jpg.setAlignment(Image.MIDDLE);jpg.setRotation((float) Math.PI / 6);document.add(new Paragraph("rotate 30 degrees"));document.add(jpg);document.newPage();jpg.setRotation((float) Math.PI / 4);document.add(new Paragraph("rotate 45 degrees"));document.add(jpg);document.newPage();jpg.setRotation((float) Math.PI / 2);document.add(new Paragraph("rotate pi/2 radians"));document.add(jpg);document.newPage();jpg.setRotation((float) (Math.PI * 0.75));document.add(new Paragraph("rotate 135 degrees"));document.add(jpg);document.newPage();jpg.setRotation((float) Math.PI);document.add(new Paragraph("rotate pi radians"));document.add(jpg);document.newPage();jpg.setRotation((float) (2.0 * Math.PI));document.add(new Paragraph("rotate 2 x pi radians"));document.add(jpg);} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}// step 5: we close the documentdocument.close();}}

生產PDF如下：