Photo to pdf for print.

PhotoService.java

package com.wizhong.os.printimage.service;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
 
import android.util.Log;
 
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfWriter;
import com.wizhong.os.print.utils.GetBytesFromFile;
 
public class PhotoService {
    private static final String LOG_TAG = "PhotoService";
    public void TestImageToPdf() throws Exception {
        imageToPdf("/sdcard/123.jpg", "/sdcard/pdf.pdf", true, true, 288, 432);
    }
 
    /**
     * @param inputFile
     *            input image path
     * @param outputFile
     *            output pdf path
     * @param isMatchFrame
     *            match frame or not
     * @param isRotate
     *            rotate or not
     * @param paperWidth
     *            paper width
     * @param paperHeight
     *            paper height
     * @throws IOException
     */
    public static void imageToPdf(String inputFile, String outputFile,
            boolean isMatchFrame, boolean isRotate, int paperWidth, int paperHeight) throws Exception {
    
        byte[] bArray = GetBytesFromFile.getBytesFromFile(new File(inputFile));
        try {
            Document document = new Document();
 
            PdfWriter.getInstance(document, new FileOutputStream(outputFile));
            /* 设置为照片纸张大小 */
            Rectangle arg0 = new Rectangle(paperWidth, paperHeight);
            document.setPageSize(arg0);
            addImage(document, bArray, isMatchFrame, isRotate, paperWidth, paperHeight);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    /**
     * TODO:将异常抛出 将图片写入PDF文件
     * http://stackoverflow.com/questions/14392896/how-i-can-convert-a-bitmap-
     * into-pdf-format-in-android
     * @param document
     * @param bArray
     * @param isMatchFrame
     * @param isRotate
     * @param width
     * @param height
     */
    private static void addImage(Document document, byte[] bArray,
            boolean isMatchFrame, boolean isRotate, int paperWidth, int paperHeight) throws Exception {
        /**____________________e___________________
         * |  _______b_______________________     |
         * | |<--------------c-------------> |    |
         * |a|                               |    |
         * | |         image              d  |    |f
         * | |                               |    |
         * | |_______________________________|    |
         * |______________________________________|
         */
        
        /* 图像横向时的尺寸 */
        float imageWidth;
        float imageHeight;
        
        float leftPaperMargin = (float) (4*72/25.4);  // a    
        float topPaperMargin = (float) (4*72/25.4);   // b
        
        /* 净尺寸(去掉页边空白) 纸张大小时相反的 */
        float netHeight = paperWidth - topPaperMargin*2;// d
        float netWidth = paperHeight * netHeight / paperWidth; // c
        
        /* 总Margin */
        float topMargin;     
        float leftMargin; 
        
        float curTopMargin;
        float curLeftMargin;
        
        float proportion = 1;
        
        float rate;
        
        Image image = null;
        
        try {
            image = Image.getInstance(bArray);
        } catch (BadElementException e) {
            e.printStackTrace();
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
 
        if (image.getWidth() >= image.getHeight()) {
            isRotate = false;
            imageWidth = image.getWidth();
            imageHeight = image.getHeight();
            rate = 90;
        } else {
            isRotate = true;
            image.setRotationDegrees(90);
            imageWidth = image.getHeight();
            imageHeight = image.getWidth();
            rate = 0;
        }
        /* width test ok */
        if(isMatchFrame == true) {
            proportion = imageWidth / netWidth;
            if(isRotate == false) {
                image.scaleAbsolute(netWidth, imageHeight / proportion);
            } else {
                image.scaleAbsolute(imageHeight / proportion, netWidth);
            }
        /* hight test ok */
        } else {
            proportion = imageHeight / netHeight;
            if(isRotate == false) {
                image.scaleAbsolute(imageWidth / proportion, netHeight);
            } else {
                image.scaleAbsolute(netHeight, imageWidth / proportion);
            }
        }
         
        /* 利用Margin特性进行裁减或者居中 */
        curTopMargin = (netHeight - imageHeight / proportion) / 2;
        curLeftMargin = (netWidth - imageWidth / proportion) / 2;

        topMargin = curTopMargin + topPaperMargin;
        leftMargin = curLeftMargin + leftPaperMargin;

        Log.i(LOG_TAG, "image.getWidth: " + image.getWidth() / proportion + ";"
                + "image.getHeight" + image.getHeight() / proportion);
        
        Log.i(LOG_TAG, "addImage [\nimageWidth=" + imageWidth + ", imageHeight=" + imageHeight + 
                ",\n leftPaperMargin=" + leftPaperMargin + ", topPaperMargin=" + topPaperMargin + 
                ",\n netWidth=" + netWidth + ", netHeight=" + netHeight + 
                ",\n curTopMargin=" + curTopMargin + ", curLeftMargin=" + curLeftMargin + 
                ",\n topMargin=" + topMargin + ", leftMargin=" + leftMargin + 
                ",\n image_width=" + image.getWidth() + ", image_height=" + image.getHeight() + 
                ",\n proportion=" + proportion + 
                "\n]"
                );
        
        /* 利用Margin特性进行裁减或者居中 */
        // (real_left, , real_top, ) 和实例图相反
        document.setMargins(topMargin, 0, leftMargin, 0);
        //document.setMargins(0, 0, 0, 0);
        
        image.setRotationDegrees(rate);
 
        try {
            document.open();
            document.add(image);
            document.close();
        } catch (DocumentException e) {
            e.printStackTrace();
        }
 
    }
}