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<DocListener> 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<PdfName, PdfObject> 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<PdfName, PdfObject> 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0document = 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：
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