Android中合多图片和文字合成PDF文件---路很长

一, Android中合多图片和文字合成PDF文件

如果遇到什么问题可以留言，欢迎你留言，我希望能帮助到你。一直怀着感恩的心，感谢路途遇到过的贵人。

效果图如下:
这个Demo中实现了图片和文字，当然单纯的文字和图片都可以合成pdf。这里我只是展示了图片和文字的合并。文字是写死的。当然你可以通过editText来进行编辑。

如上图就是我们项目中的需求:这一篇我先写pdf的合成。后面关于智能裁剪方面的我会单独写一篇博客。

第二：需要技术：

1.pdf编辑jar:
iTextpdf.jar这个百度很多，很多csdn都需要钱的。这里需要的直接到我项目里面下载或者去官网下载都免费的。提供了图片和文字合成pdf格式文件，以及文件内容的编辑设置，文字居中标题内容等等。以及图片大小和图片的宽高比例，pdf的页面宽度等。都可以让我们编辑出好看的pdf文件。

**2.pdf文件预览:**谷歌提供了预览pdf文件的库

implementation 'com.github.barteksc:android-pdf-viewer:3.1.0-beta.1'

第三：代码部分:源码：

public class Document implements DocListener, IAccessibleElement {    public static boolean compress = true;    public static boolean plainRandomAccess = false;    public static float wmfFontCorrection = 0.86F;    protected ArrayList listeners;    protected boolean open;    protected boolean close;    protected Rectangle pageSize;    protected float marginLeft;    protected float marginRight;    protected float marginTop;    protected float marginBottom;    protected boolean marginMirroring;    protected boolean marginMirroringTopBottom;    protected String javaScript_onLoad;    protected String javaScript_onUnLoad;    protected String htmlStyleClass;    protected int pageN;    protected int chapternumber;    protected PdfName role;    protected HashMap accessibleAttributes;    protected AccessibleElementId id;    public Document() {        this(PageSize.A4);    }    /**通过这些构造方法，我想一个pfd的创建随随便便来了吧。    1.第一个默认的是a4纸的大小。    2.第二个是默认距离边缘left,top,right,bootom大小。    3.第三个是设置了很多参数。自己可以看其意思。    **/    public Document(Rectangle pageSize) {        this(pageSize, 36.0F, 36.0F, 36.0F, 36.0F);    }    public Document(Rectangle pageSize, float marginLeft, float marginRight, float marginTop, float marginBottom) {        this.listeners = new ArrayList();        this.marginLeft = 0.0F;        this.marginRight = 0.0F;        this.marginTop = 0.0F;        this.marginBottom = 0.0F;        this.marginMirroring = false;        this.marginMirroringTopBottom = false;        this.javaScript_onLoad = null;        this.javaScript_onUnLoad = null;        this.htmlStyleClass = null;        this.pageN = 0;        this.chapternumber = 0;        this.role = PdfName.DOCUMENT;        this.accessibleAttributes = null;        this.id = new AccessibleElementId();        this.pageSize = pageSize;        this.marginLeft = marginLeft;        this.marginRight = marginRight;        this.marginTop = marginTop;        this.marginBottom = marginBottom;    }    public void addDocListener(DocListener listener) {        this.listeners.add(listener);        if (listener instanceof IAccessibleElement) {            IAccessibleElement ae = (IAccessibleElement)listener;            ae.setRole(this.role);            ae.setId(this.id);            if (this.accessibleAttributes != null) {                Iterator i$ = this.accessibleAttributes.keySet().iterator();                while(i$.hasNext()) {                    PdfName key = (PdfName)i$.next();                    ae.setAccessibleAttribute(key, (PdfObject)this.accessibleAttributes.get(key));                }            }        }    }    public void removeDocListener(DocListener listener) {        this.listeners.remove(listener);    }    /**这里的add方法为我们提供了图文混排的基础    document.add(Element);        这里的Element我们可以看源码：    public interface Element {    int HEADER = 0;//头部    int TITLE = 1;//标题    int SUBJECT = 2;    int KEYWORDS = 3;    int AUTHOR = 4;    int PRODUCER = 5;    int CREATIONDATE = 6;    int CREATOR = 7;    int LANGUAGE = 8;    int CHUNK = 10;    int PHRASE = 11;    int PARAGRAPH = 12;    int SECTION = 13;    int LIST = 14;    int LISTITEM = 15;    int CHAPTER = 16;    int ANCHOR = 17;    int PTABLE = 23;    int ANNOTATION = 29;    int RECTANGLE = 30;    int JPEG = 32;//图片    int JPEG2000 = 33;//图片    int IMGRAW = 34;    int IMGTEMPLATE = 35;    int JBIG2 = 36;    int DIV = 37;    int MARKED = 50;    int YMARK = 55;    int WRITABLE_DIRECT = 666;    int ALIGN_UNDEFINED = -1;    int ALIGN_LEFT = 0;    int ALIGN_CENTER = 1;    int ALIGN_RIGHT = 2;    int ALIGN_JUSTIFIED = 3;    int ALIGN_TOP = 4;    int ALIGN_MIDDLE = 5;    int ALIGN_BOTTOM = 6;    int ALIGN_BASELINE = 7;    int ALIGN_JUSTIFIED_ALL = 8;    int CCITTG4 = 256;    int CCITTG3_1D = 257;    int CCITTG3_2D = 258;    int CCITT_BLACKIS1 = 1;    int CCITT_ENCODEDBYTEALIGN = 2;    int CCITT_ENDOFLINE = 4;    int CCITT_ENDOFBLOCK = 8;        **/    public boolean add(Element element) throws DocumentException {        if (this.close) {            throw new DocumentException(MessageLocalization.getComposedMessage("the.document.has.been.closed.you.can.t.add.any.elements", new Object[0]));        } else if (!this.open && element.isContent()) {            throw new DocumentException(MessageLocalization.getComposedMessage("the.document.is.not.open.yet.you.can.only.add.meta.information", new Object[0]));        } else {            boolean success = false;            if (element instanceof ChapterAutoNumber) {                this.chapternumber = ((ChapterAutoNumber)element).setAutomaticNumber(this.chapternumber);            }            DocListener listener;            for(Iterator i$ = this.listeners.iterator(); i$.hasNext(); success |= listener.add(element)) {                listener = (DocListener)i$.next();            }            if (element instanceof LargeElement) {                LargeElement e = (LargeElement)element;                if (!e.isComplete()) {                    e.flushContent();                }            }            return success;        }    }        public void open() {        if (!this.close) {            this.open = true;        }        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.setPageSize(this.pageSize);            listener.setMargins(this.marginLeft, this.marginRight, this.marginTop, this.marginBottom);            listener.open();        }    }    public boolean setPageSize(Rectangle pageSize) {        this.pageSize = pageSize;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.setPageSize(pageSize);        }        return true;    }    public boolean setMargins(float marginLeft, float marginRight, float marginTop, float marginBottom) {        this.marginLeft = marginLeft;        this.marginRight = marginRight;        this.marginTop = marginTop;        this.marginBottom = marginBottom;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.setMargins(marginLeft, marginRight, marginTop, marginBottom);        }        return true;    }    public boolean newPage() {        if (this.open && !this.close) {            Iterator i$ = this.listeners.iterator();            while(i$.hasNext()) {                DocListener listener = (DocListener)i$.next();                listener.newPage();            }            return true;        } else {            return false;        }    }        public void resetPageCount() {        this.pageN = 0;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.resetPageCount();        }    }    //设置页面的个数。每一页是一个A4纸张的大小    public void setPageCount(int pageN) {        this.pageN = pageN;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.setPageCount(pageN);        }    }          public int getPageNumber() {        return this.pageN;    }    //关闭。    public void close() {        if (!this.close) {            this.open = false;            this.close = true;        }        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            DocListener listener = (DocListener)i$.next();            listener.close();        }    }    //添加标题头。直接调用或者写个工具类就行。    public boolean addHeader(String name, String content) {        try {            return this.add(new Header(name, content));        } catch (DocumentException var4) {            throw new ExceptionConverter(var4);        }    }    //这是标题主题    public boolean addTitle(String title) {        try {            return this.add(new Meta(1, title));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }    //设置副主题    public boolean addSubject(String subject) {        try {            return this.add(new Meta(2, subject));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }       public boolean addKeywords(String keywords) {        try {            return this.add(new Meta(3, keywords));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }    public boolean addAuthor(String author) {        try {            return this.add(new Meta(4, author));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }    public boolean addCreator(String creator) {        try {            return this.add(new Meta(7, creator));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }    public boolean addProducer() {        try {            return this.add(new Meta(5, Version.getInstance().getVersion()));        } catch (DocumentException var2) {            throw new ExceptionConverter(var2);        }    }    /**这里进行语言的设置。我们可以通过这个来进行字体的设置**/    public boolean addLanguage(String language) {        try {            return this.add(new Meta(8, language));        } catch (DocumentException var3) {            throw new ExceptionConverter(var3);        }    }    public boolean addCreationDate() {        try {            SimpleDateFormat sdf = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy");            return this.add(new Meta(6, sdf.format(new Date())));        } catch (DocumentException var2) {            throw new ExceptionConverter(var2);        }    }    public float leftMargin() {        return this.marginLeft;    }    public float rightMargin() {        return this.marginRight;    }    public float topMargin() {        return this.marginTop;    }    public float bottomMargin() {        return this.marginBottom;    }    public float left() {        return this.pageSize.getLeft(this.marginLeft);    }    public float right() {        return this.pageSize.getRight(this.marginRight);    }    public float top() {        return this.pageSize.getTop(this.marginTop);    }    public float bottom() {        return this.pageSize.getBottom(this.marginBottom);    }    public float left(float margin) {        return this.pageSize.getLeft(this.marginLeft + margin);    }    public float right(float margin) {        return this.pageSize.getRight(this.marginRight + margin);    }    public float top(float margin) {        return this.pageSize.getTop(this.marginTop + margin);    }    public float bottom(float margin) {        return this.pageSize.getBottom(this.marginBottom + margin);    }    public Rectangle getPageSize() {        return this.pageSize;    }    public boolean isOpen() {        return this.open;    }    public void setJavaScript_onLoad(String code) {        this.javaScript_onLoad = code;    }    public String getJavaScript_onLoad() {        return this.javaScript_onLoad;    }    public void setJavaScript_onUnLoad(String code) {        this.javaScript_onUnLoad = code;    }    public String getJavaScript_onUnLoad() {        return this.javaScript_onUnLoad;    }    public void setHtmlStyleClass(String htmlStyleClass) {        this.htmlStyleClass = htmlStyleClass;    }    public String getHtmlStyleClass() {        return this.htmlStyleClass;    }    public boolean setMarginMirroring(boolean marginMirroring) {        this.marginMirroring = marginMirroring;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            Object element = (DocListener)i$.next();            DocListener listener = (DocListener)element;            listener.setMarginMirroring(marginMirroring);        }        return true;    }    public boolean setMarginMirroringTopBottom(boolean marginMirroringTopBottom) {        this.marginMirroringTopBottom = marginMirroringTopBottom;        Iterator i$ = this.listeners.iterator();        while(i$.hasNext()) {            Object element = (DocListener)i$.next();            DocListener listener = (DocListener)element;            listener.setMarginMirroringTopBottom(marginMirroringTopBottom);        }        return true;    }    public boolean isMarginMirroring() {        return this.marginMirroring;    }    public PdfObject getAccessibleAttribute(PdfName key) {        return this.accessibleAttributes != null ? (PdfObject)this.accessibleAttributes.get(key) : null;    }    public void setAccessibleAttribute(PdfName key, PdfObject value) {        if (this.accessibleAttributes == null) {            this.accessibleAttributes = new HashMap();        }        this.accessibleAttributes.put(key, value);    }    public HashMap getAccessibleAttributes() {        return this.accessibleAttributes;    }    public PdfName getRole() {        return this.role;    }    public void setRole(PdfName role) {        this.role = role;    }    public AccessibleElementId getId() {        return this.id;    }    public void setId(AccessibleElementId id) {        this.id = id;    }    public boolean isInline() {        return false;    }}

当然根据上面自己可以丰富自己的工具类通过构造这模式:

package com.example.luhenchang_pdf.pdfutils;import android.support.annotation.NonNull;import com.itextpdf.text.Document;import com.itextpdf.text.DocumentException;import com.itextpdf.text.Element;import com.itextpdf.text.Font;import com.itextpdf.text.Image;import com.itextpdf.text.PageSize;import com.itextpdf.text.Paragraph;import com.itextpdf.text.pdf.BaseFont;import com.itextpdf.text.pdf.PdfWriter;import com.itextpdf.text.pdf.codec.PngImage;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;public class PdfItextUtil {//转换    private Document document;    // savePath:保存pdf的路径    public PdfItextUtil(String savePath) throws Exception {        //创建新的PDF文档：A4大小，左右上下边框均为0        document = new Document(PageSize.ROYAL_QUARTO,50,50,0,0);        //获取PDF书写器        PdfWriter.getInstance(document, new FileOutputStream(savePath));        //打开文档        document.open();    }    public void close(){        if (document.isOpen()) {            document.close();        }    }    // 添加图片到pdf中，这张图片在pdf中居中显示    // imgPath:图片的路径，我使用的是sdcard中图片    // imgWidth：图片在pdf中所占的宽    // imgHeight：图片在pdf中所占的高    public PdfItextUtil addImageToPdfCenterH(@NonNull String imgPath, float imgWidth, float imgHeight) throws IOException, DocumentException {        //获取图片        Image img = Image.getInstance(imgPath);        img.setAlignment(Element.ALIGN_CENTER);        img.scaleToFit(imgWidth,imgHeight);        //添加到PDF文档        document.add(img);        return this;    }    public PdfItextUtil addPngToPdf(InputStream inputStream) throws DocumentException, IOException {        Image img = PngImage.getImage(inputStream);        img.setAlignment(Element.ALIGN_CENTER);        //添加到PDF文档        document.add(img);        return this;    }    // 添加文本到pdf中    public PdfItextUtil addTextToPdf(String content) throws DocumentException {        Paragraph elements = new Paragraph(content, setChineseFont());        elements.setAlignment(Element.ALIGN_BASELINE);//        elements.setIndentationLeft(55);  //设置距离左边的距离        document.add(elements); // result为保存的字符串        return this;    }    // 给pdf添加个标题，居中黑体    public PdfItextUtil addTitleToPdf(String title){        try {            Paragraph elements = new Paragraph(title, setChineseTiltleFont(18));            elements.setAlignment(Element.ALIGN_CENTER);            document.add(elements); // result为保存的字符串        } catch (DocumentException e) {            e.printStackTrace();        }        return this;    }    private Font setChineseFont() {        return setChineseFont(12);    }    private Font setChineseFont(int size) {        BaseFont bf;        Font fontChinese = null;        try {            // STSong-Light : Adobe的字体            // UniGB-UCS2-H : pdf 字体            bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);            fontChinese = new Font(bf, size, Font.NORMAL);        } catch (DocumentException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return fontChinese;    }    private Font setChineseTiltleFont(int size) {        BaseFont bf;        Font fontChinese = null;        try {            // STSong-Light : Adobe的字体            // UniGB-UCS2-H : pdf 字体            bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);            fontChinese = new Font(bf, size, Font.BOLD);        } catch (DocumentException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return fontChinese;    }}

项目地址码云：

一, Android中合多图片和文字合成PDF文件

第二：需要技术：

第三：代码部分:源码：

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