如何在 Android 上使用 iText 或其他库创建 PDF 文件？

Question

如何在 Android 上使用 iText 或其他库创建 PDF 文件？

有没有关于 android 版 iText 的教程？

谢谢

Answer 1

我在 java swing 应用程序中使用了 iText - 它可以很好地创建一些基本的 PDF 文件。代码是这样的：

    @Override public void buildPDF(List<Folder> folders) {        
    Document document = new Document();
    String fname = "";
    boolean open = false;
    try {
            // step 2:
            // we create a writer that listens to the document
            // and directs a PDF-stream to a file
            fname = filename(getName()) + "-" + filename(getDataset().getName()) + ".pdf";

            PdfWriter writer = PdfWriter.getInstance(document,
                            new FileOutputStream(fname));

            for (int i = 0; i < folders.size(); i++ ) {
                // grab the folder
                LIFolder f = (LIFolder) folders.get(i);

                if (f == null) continue;

                open = true;
                break;
            }

            // we have no valid folders
            if (folders.size() > 0 && !open) {
                // they selected an empty row
                javax.swing.JOptionPane.showMessageDialog(null, BUNDLE.getString("report-none-selected"), 
                        BUNDLE.getString("report-none-selected-title"), 
                        javax.swing.JOptionPane.ERROR_MESSAGE);
                return;
            }

            if (folders.size() == 0) {
                // get all folders from dataset
                folders = FolderFinder.findAll(getSession(), getDataset());
            }

            open = false;
            for (int i = 0; i < folders.size(); i++ ) {
                // grab the folder
                LIFolder f = (LIFolder) folders.get(i);

                if (f == null) continue;

                if (!open) {
                    open = true;
                    document.open();
                }

                Paragraph p = new Paragraph(BUNDLE.getString("report-heading-summary-main"), getPageHeadingFont());
                p.setAlignment("center");
                document.add(p);
                p = new Paragraph(BUNDLE.getString("report-heading-summary-main-sub"), this.pageHeadingFont1);
                p.setAlignment("center");
                document.add(p);

                blankLine(document);
                drawLine(writer);

                ///////////////////////////////////////////////////////////////////////////////////////////////////
                // Primary Statement Details
                ///////////////////////////////////////////////////////////////////////////////////////////////////                    
                p = new Paragraph("Primary Statement Details", this.pageHeadingFont2);
                p.setAlignment("center");
                document.add(p);

                blankLine(document);
                PdfPTable table = new PdfPTable(4);

                table.addCell(new BorderlessCell(new Paragraph("Dataset:", getFieldHeadingFont())));
                BorderlessCell cell = new BorderlessCell(new Paragraph(getDataset().getName(), getTextFont()));
                cell.setColspan(3);
                table.addCell(cell);

                table.addCell(new BorderlessCell(new Paragraph("Data Entry Clerk:", getFieldHeadingFont())));
                cell = new BorderlessCell(new Paragraph(
                        (f.getDataEntryClerk() != null ? f.getDataEntryClerk().toDescriptionPathString() : emptyIfNull(null)), 
                        getTextFont()));
                cell.setColspan(3);
                table.addCell(cell);

                table.setWidthPercentage(100);
                cell = new BorderlessCell(new Paragraph("Statement Number:", getFieldHeadingFont()));
                table.addCell(cell);
                table.addCell(new BorderlessCell(new Paragraph(f.getReferenceId(), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Statement Date:", getFieldHeadingFont())));

                String strDate = "";
                java.util.Date date = f.getStatementDate();
                if (date != null) {
                    SimpleDateFormat formatter = new SimpleDateFormat("MM/dd/yyyy"); 
                    strDate = formatter.format(date);
                }
                table.addCell(new BorderlessCell(new Paragraph(strDate, getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Statement Location:", getFieldHeadingFont())));
                cell = new BorderlessCell(new Paragraph(emptyIfNull(f.getTakerLocation()), getTextFont()));
                cell.setColspan(3);
                table.addCell(cell);

                table.addCell(new BorderlessCell(new Paragraph("Statement keywords:", getFieldHeadingFont())));
                cell = new BorderlessCell(new Paragraph(emptyIfNull(f.getKeywords()), getTextFont()));
                cell.setColspan(3);
                table.addCell(cell);

                document.add(table);
                ///////////////////////////////////////////////////////////////////////////////////////////////////


                ///////////////////////////////////////////////////////////////////////////////////////////////////
                // Statement Giver's Details
                ///////////////////////////////////////////////////////////////////////////////////////////////////                    
                LIPerson p01 = null;
                Set<Actor> actors = f.getActors();
                Iterator iter = actors.iterator();
                while (iter.hasNext()) {
                    Actor actor = (Actor) iter.next();
                    if (actor instanceof LIPerson) {
                        LIPerson person = (LIPerson) actor;
                        if (person.getReferenceId().toString().equalsIgnoreCase("p01") ) {
                            p01 = person;
                            break;
                        }
                    }
                }

                blankLine(document);
                drawLine(writer);
                p = new Paragraph(new Chunk("Statement Giver's Details", this.pageHeadingFont2));
                p.setAlignment("center");                        
                document.add(p);

                java.util.ArrayList giver = new java.util.ArrayList();
                if (p01 != null)
                    giver.add(p01);

                table = new PdfPTable(2);
                table.setWidthPercentage(100f);
                table.addCell(new BorderlessCell(new Paragraph("Name of Statement Giver:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(ActorsToString(giver), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Sex:", getFieldHeadingFont())));
                if (p01 == null)
                    table.addCell(new BorderlessCell(new Paragraph(emptyIfNull("TBD"), getTextFont())));
                else
                    table.addCell(new BorderlessCell(new Paragraph((p01.getSex() != null ? p01.getSex().toString() : ""), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Tribe:", getFieldHeadingFont())));
                if (p01 == null)
                    table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(null), getTextFont())));
                else
                    table.addCell(new BorderlessCell(
                            new Paragraph((p01.getEthnicityOrTribe() != null ? p01.getEthnicityOrTribe().toDescriptionPathString() : emptyIfNull(null)), 
                            getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Nationality:", getFieldHeadingFont())));
                if (p01 == null)
                    table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(null), getTextFont())));
                else
                    table.addCell(new BorderlessCell(
                            new Paragraph((p01.getNationality() != null ? p01.getNationality().toDescriptionPathString() : emptyIfNull(null)), 
                            getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Marital Status:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getMaritalStatus()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Education Level:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getEducationLevel()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("County of Origin:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getCountyOfOrigin()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Mother's Name:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getMothersName()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Father's Name:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getFathersName()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("# of Dependents:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(Integer.toString(f.getNumDependents()), getTextFont())));

                table.addCell(new BorderlessCell(new Paragraph("Phone Number:", getFieldHeadingFont())));
                table.addCell(new BorderlessCell(new Paragraph(emptyIfNull(f.getPhoneNumber()), getTextFont())));

                document.add(table);

                ///////////////////////////////////////////////////////////////////////////////////////////////////
                // Summary
                ///////////////////////////////////////////////////////////////////////////////////////////////////                    
                blankLine(document);
                drawLine(writer);
                p = new Paragraph(new Chunk("Summary", this.pageHeadingFont2));
                p.setAlignment("center");                        
                document.add(p);
                p = new Paragraph(new Chunk(emptyIfNull(f.getSourceSummary()), getTextFont()));
                document.add(p);

                ///////////////////////////////////////////////////////////////////////////////////////////////////
                // Incident(s)
                ///////////////////////////////////////////////////////////////////////////////////////////////////                                        
                Set<Act> acts = f.getActs();

                if (acts.size() > 0) {
                    // sort them by id
                    Hashtable map = new Hashtable();
                    Iterator it = acts.iterator();
                    String[] ids = new String[acts.size()];
                    int x = 0;
                    while (it.hasNext()) {
                        LIAct act = (LIAct) it.next();
                        String index = Integer.toString(act.getId());
                        map.put(index, act);

                        ids[x++] = index;
                    }
                    java.util.Arrays.sort(ids);

                    blankLine(document);
                    drawLine(writer);
                    p = new Paragraph(new Chunk("Act(s)", this.pageHeadingFont2));
                    p.setAlignment("center");                        
                    document.add(p);

                    blankLine(document);
                    table = new PdfPTable(4);
                    table.setWidthPercentage(100);

                    for (int y = 0; y < ids.length; y++) {
                        LIAct act = (LIAct) map.get(ids[y]);

                        table.addCell(new BorderlessCell(new Paragraph("Act ID:", getFieldHeadingFont())));
                        cell = new BorderlessCell(new Paragraph(act.getReferenceId(), getTextFont()));
                        cell.setColspan(3);
                        table.addCell(cell);

                        table.addCell(new BorderlessCell(new Paragraph("Start Date:", getFieldHeadingFont())));
                        table.addCell(new BorderlessCell(new Paragraph((act.getWhen() != null ? act.getWhen().toString():""), getTextFont())));

                        table.addCell(new BorderlessCell(new Paragraph("End Date:", getFieldHeadingFont())));
                        table.addCell(new BorderlessCell(new Paragraph((act.getUntil() != null?act.getUntil().toString():""), getTextFont())));

                        table.addCell(new BorderlessCell(new Paragraph("Location of act:", getFieldHeadingFont())));                            
                        p = new Paragraph(emptyIfNull(act.getWhere().toString()), getTextFont());
                        p.setAlignment(Paragraph.ALIGN_LEFT);
                        cell = new BorderlessCell(p);
                        cell.setColspan(3);                            
                        table.addCell(cell);

                        table.addCell(new BorderlessCell(new Paragraph("Precise Location:", getFieldHeadingFont())));                            
                        p = new Paragraph(emptyIfNull(act.getPreciseLocation()), getTextFont());
                        p.setAlignment(Paragraph.ALIGN_LEFT);
                        cell = new BorderlessCell(p);
                        cell.setColspan(3);                            
                        table.addCell(cell);

                        table.addCell(new BorderlessCell(new Paragraph("Violation:", getFieldHeadingFont())));                            
                        p = new Paragraph(emptyIfNull(act.getViolation().toDescriptionPathString()), getTextFont());
                        p.setAlignment(Paragraph.ALIGN_LEFT);
                        cell = new BorderlessCell(p);
                        cell.setColspan(3);                            
                        table.addCell(cell);

                        table.addCell(new BorderlessCell(new Paragraph("Description:", getFieldHeadingFont())));                                         
                        p = new Paragraph(emptyIfNull(act.getDescriptionLocation()), getTextFont());
                        p.setAlignment(Paragraph.ALIGN_LEFT);
                        cell = new BorderlessCell(p);
                        cell.setColspan(3);                            
                        table.addCell(cell);

                        // add empty cell
                        cell = new BorderlessCell(new Paragraph(""));
                        cell.setColspan(4);
                        table.addCell(cell);                            
                        cell = new BorderlessCell(new Paragraph(""));
                        cell.setColspan(4);
                        table.addCell(cell);                            
                    }

                    document.add(table);
                }                    

                /////////////////////////////////////////////////////////////////////////////////////////////////
                // Victims
                /////////////////////////////////////////////////////////////////////////////////////////////////
                List<Actor> victims = this.getAllVictims(f);

                if (!victims.isEmpty()) {
                    blankLine(document);
                    drawLine(writer);
                    String strVictims = ActorsToString(victims);
                    p = new Paragraph(new Chunk("Victim(s)", this.pageHeadingFont2));
                    p.setAlignment("center");                        
                    document.add(p);

                    p = new Paragraph(new Chunk("Name(s) of Victim(s): ", getFieldHeadingFont()));
                    p.add(new Chunk(strVictims, getTextFont()));
                    document.add(p);

                    String gender = ActorsToGender(victims);
                    p = new Paragraph(new Chunk("Gender: ", getFieldHeadingFont()));
                    p.add(new Chunk(gender, getTextFont()));
                    document.add(p);
                }

                /////////////////////////////////////////////////////////////////////////////////////////////////

                /////////////////////////////////////////////////////////////////////////////////////////////////
                // Perps
                /////////////////////////////////////////////////////////////////////////////////////////////////
                List<Actor> perps = this.getAllPerpetrators(f);
                if (!perps.isEmpty()) {
                    blankLine(document);
                    drawLine(writer);
                    p = new Paragraph(new Chunk("Perpetrator(s)", this.pageHeadingFont2));
                    p.setAlignment("center");                        
                    document.add(p);

                    String strPerps = ActorsToString(perps);
                    p = new Paragraph(new Chunk("Name(s) of alleged perpetrator(s): ", getFieldHeadingFont()));
                    p.add(new Chunk(strPerps, getTextFont()));
                    document.add(p);
                }
                /////////////////////////////////////////////////////////////////////////////////////////////////

                document.newPage();
            }

    } catch (DocumentException de) {
            System.err.println(de.getMessage());
    } catch (java.io.IOException ioe) {
            System.err.println(ioe.getMessage());
    }

    // step 5: we close the document
    if (open) {
        document.close();

        if (!fname.equals("")) {
            // launch it
            Reports.LaunchPDF(fname);        
        }
    }        

}

如果您需要更多信息，请告诉我。祝你好运！

Answer 2

package com.cete.androidexamples.dynamicpdf.helloworld;

import com.cete.dynamicpdf.*;
import com.cete.dynamicpdf.pageelements.Label;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.widget.Toast;

public class DynamicPDFHelloWorld extends Activity {
    private static String FILE = Environment.getExternalStorageDirectory()
            + "/HelloWorld.pdf";

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Create a document and set it's properties
        Document objDocument = new Document();
        objDocument.setCreator("DynamicPDFHelloWorld.java");
        objDocument.setAuthor("Your Name");
        objDocument.setTitle("Hello World");

        // Create a page to add to the document
        Page objPage = new Page(PageSize.LETTER, PageOrientation.PORTRAIT,
                54.0f);

        // Create a Label to add to the page
        String strText = "Hello World...\nFrom DynamicPDF™ Generator "
                + "for Java\nDynamicPDF.com";
        Label objLabel = new Label(strText, 0, 0, 504, 100,
                Font.getHelvetica(), 18, TextAlign.CENTER);

        // Add label to page
        objPage.getElements().add(objLabel);

        // Add page to document
        objDocument.getPages().add(objPage);

        try {
            // Outputs the document to file
            objDocument.draw(FILE);
            Toast.makeText(this, "File has been written to :" + FILE,
                    Toast.LENGTH_LONG).show();
        } catch (Exception e) {
            Toast.makeText(this,
                    "Error, unable to write to file\n" + e.getMessage(),
                    Toast.LENGTH_LONG).show();
        }
    }
}

将 DynamicPDF 添加到 libs 文件
您可以从链接下载它

Answer 3

import android.graphics.pdf.PdfDocument;  
    import android.graphics.Canvas;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.graphics.Paint;
    
    
        private void designFile(){
    
    int pageHeight = 2200;
        int pagewidth = 1240;
    
    
      bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.pizza);
            bitbip = Bitmap.createScaledBitmap(bitmap, 1100, 700, true);
    
    
        PdfDocument    document = new PdfDocument();
            Paint paint = new Paint();
            Paint paint2= new Paint();
    
    
            PdfDocument.PageInfo mypageInfo = new PdfDocument.PageInfo.Builder(pagewidth, pageHeight, 2).create();
    
            PdfDocument.Page myPage = document.startPage(mypageInfo);
    
            Canvas canvas = myPage.getCanvas();
    
            canvas.drawBitmap(bitmap, 350, 10, paint);
    
          paint2.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
            paint2.setColor(Color.BLACK);
            paint2.setTextSize(30);
            paint2.setTextAlign(Paint.Align.CENTER);
            canvas.drawText("INSTAGRAM", 150, 125, paint2);
    
       document.finishPage(myPage);
    }

Answer 4

您可以使用 iText 创建 PDF。使用最新版本 (5.1.3) 并在构建路径中仅包含 itextpdf-5.1.3.jar。您可以使用类似的方法来完成 pdf 创建。

Document document = new Document();
file = Environment.getExternalStorageDirectory().getPath() + "/Hello.pdf"
PdfWriter.getInstance(document,new FileOutputStream(file));
document.open();
Paragraph p = new Paragraph("Hello PDF");
document.add(p);
document.close();

另外，不要忘记使用manifest.xml 中的写入外部存储的权限。

Answer 5

这很简单，例如

这里我的代码存储库（更新链接）

gradle.build

compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.madgag:scpkix-jdk15on:1.47.0.1'
compile 'com.itextpdf:itextpdf:5.0.6'

activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.hackro.itext.MainActivity">
    
    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnwrite"
        android:text="PDF"
        android:onClick="GeneratePDF"
        />
    </RelativeLayout>

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.itextpdf.text.pdf.BaseFont;
import java.io.File;

public class MainActivity extends Activity {

    private static final String LOG_TAG = "GeneratePDF";


    private BaseFont bfBold;

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



    }


    public void GeneratePDF(View view)
    {
        // TODO Auto-generated method stub
        String filename = "david";
        String filecontent = "Contenido";
        Metodos fop = new Metodos();
        if (fop.write(filename, filecontent)) {
            Toast.makeText(getApplicationContext(),
                    filename + ".pdf created", Toast.LENGTH_SHORT)
                    .show();
        } else {
            Toast.makeText(getApplicationContext(), "I/O error",
                    Toast.LENGTH_SHORT).show();
        }
    }

  }

Metodos.java

 import android.util.Log;
    
    import com.itextpdf.text.BaseColor;
    import com.itextpdf.text.Document;
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.Element;
    import com.itextpdf.text.Font;
    import com.itextpdf.text.Paragraph;
    import com.itextpdf.text.Phrase;
    import com.itextpdf.text.pdf.PdfPCell;
    import com.itextpdf.text.pdf.PdfPTable;
    import com.itextpdf.text.pdf.PdfWriter;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    /**
     * Created by hackro on 24/11/15.
     */
    public class Metodos {
    
    
        public Boolean write(String fname, String fcontent) {
            try {
                String fpath = "/sdcard/" + fname + ".pdf";
                File file = new File(fpath);
    
                if (!file.exists()) {
                    file.createNewFile();
                }
    
                Font bfBold12 = new Font(Font.FontFamily.TIMES_ROMAN, 12, Font.BOLD, new BaseColor(0, 0, 0));
                Font bf12 = new Font(Font.FontFamily.TIMES_ROMAN, 12);
    
    
                Document document = new Document();
    
                PdfWriter.getInstance(document,
                        new FileOutputStream(file.getAbsoluteFile()));
                document.open();
    
                document.add(new Paragraph("Sigueme en Twitter!"));
    
                document.add(new Paragraph("@DavidHackro"));
                document.close();
    
                return true;
            } catch (IOException e) {
                e.printStackTrace();
                return false;
            } catch (DocumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                return false;
            }
        }}
    

结果

祝你好运

Answer 6

这是我用于创建包含文本和图像的 pdf 文件的示例编码
使用 Itext 库的内容并将 pdf 文件存储在外部
储存地点。唯一的事情是你需要下载 itext
库并将其添加到您的项目中。

private void createPdf() {
                // TODO Auto-generated method stub
                com.itextpdf.text.Document document = new com.itextpdf.text.Document();

                 try {
                        String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/vindroid";

                        File dir = new File(path);
                            if(!dir.exists())
                                dir.mkdirs();

                        Log.d("PDFCreator", "PDF Path: " + path);


                        File file = new File(dir, "sample.pdf");
                        FileOutputStream fOut = new FileOutputStream(file);

                        PdfWriter.getInstance(document, fOut);

                        //open the document
                        document.open();


                        Paragraph p1 = new Paragraph("Sample PDF CREATION USING IText");
                        Font paraFont= new Font(Font.FontFamily.COURIER);
                        p1.setAlignment(Paragraph.ALIGN_CENTER);
                        p1.setFont(paraFont);

                         //add paragraph to document    
                         document.add(p1);

                         Paragraph p2 = new Paragraph("This is an example of a simple paragraph");
                         Font paraFont2= new Font(Font.FontFamily.COURIER,14.0f,0, CMYKColor.GREEN);
                         p2.setAlignment(Paragraph.ALIGN_CENTER);
                         p2.setFont(paraFont2);

                         document.add(p2);

                         ByteArrayOutputStream stream = new ByteArrayOutputStream();
                         Bitmap bitmap = BitmapFactory.decodeResource(getBaseContext().getResources(), R.drawable.ic_launcher);
                         bitmap.compress(Bitmap.CompressFormat.JPEG, 100 , stream);
                         Image myImg = Image.getInstance(stream.toByteArray());
                         myImg.setAlignment(Image.MIDDLE);

                         //add image to document
                         document.add(myImg);




                 } catch (DocumentException de) {
                         Log.e("PDFCreator", "DocumentException:" + de);
                 } catch (IOException e) {
                         Log.e("PDFCreator", "ioException:" + e);
                 } 
                 finally
                 {
                         document.close();
                 }

            }      

Answer 7

我创建了一个示例项目，用于使用itextpdf/itext7库从数据创建pdf文件

示例项目链接：https://github.com/rheyansh/RPdfGenerator

在您的应用程序 gradle 中添加以下依赖项：

implementation 'com.itextpdf:itext7-core:7.1.12'

重要说明

添加AndroidManifest.xml 中的 WRITE_EXTERNAL_STORAGE 权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

在 AndroidManifest.xml 中添加文件提供程序

<provider
        android:name="androidx.core.content.FileProvider"
        android:authorities="com.rheyansh.rpdfgenerator.fileprovider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
    </provider>

添加 XML 资源文件夹（请参阅示例文件夹中的provider_paths.xml）

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path name="external_files" path="."/>
</paths>

创建 RPdfGenerator 类

import android.content.Context
import android.os.Environment
import com.rheyansh.model.RTransaction
import android.widget.Toast
import com.itextpdf.io.font.constants.StandardFonts
import com.itextpdf.kernel.colors.ColorConstants
import com.itextpdf.kernel.font.PdfFontFactory
import com.itextpdf.kernel.pdf.PdfDocument
import com.itextpdf.kernel.pdf.PdfWriter
import com.itextpdf.kernel.pdf.action.PdfAction
import com.itextpdf.layout.Document
import com.itextpdf.layout.element.Paragraph
import com.itextpdf.layout.element.Table
import com.itextpdf.layout.element.Text
import com.itextpdf.layout.property.TextAlignment
import com.itextpdf.layout.property.UnitValue
import com.rheyansh.lenden.model.RPdfGeneratorModel
import java.io.File
import java.io.FileOutputStream

object RPdfGenerator {

    private val linkSample = "https://github.com/rheyansh/RPdfGenerator"

    fun generatePdf(context: Context, info: RPdfGeneratorModel) {

        val FILENAME = info.header + ".pdf"
        val filePath = getAppPath(context) + FILENAME

        if (File(filePath).exists()) {
            File(filePath).delete()
        }

        val fOut = FileOutputStream(filePath)
        val pdfWriter = PdfWriter(fOut)

        // Creating a PdfDocument
        val pdfDocument =
            PdfDocument(pdfWriter)
        val layoutDocument = Document(pdfDocument)

        // title
        addTitle(layoutDocument, info.header)

        //add empty line
        addEmptyLine(layoutDocument,1)

        //Add sub heading
        val appName = "RPdfGenerator"
        addSubHeading(layoutDocument, "Generated via: ${appName}")
        addLink(layoutDocument, linkSample)

        //add empty line
        addEmptyLine(layoutDocument,1)

        // customer reference information
        addDebitCredit(layoutDocument, info)

        //add empty line
        addEmptyLine(layoutDocument,1)

        //Add sub heading
        addSubHeading(layoutDocument, "Transactions")

        //Add list
        addTable(layoutDocument, info.list)

        layoutDocument.close()
        Toast.makeText(context, "Pdf saved successfully to location $filePath", Toast.LENGTH_LONG).show()

        //FileUtils.openFile(context, File(filePath))
    }

    private fun getAppPath(context: Context): String {
        val dir = File(
            Environment.getExternalStorageDirectory()
                .toString() + File.separator
                    + context.resources.getString(R.string.app_name)
                    + File.separator
        )
        if (!dir.exists()) {
            dir.mkdir()
        }
        return dir.path + File.separator
    }

    private fun addTable(layoutDocument: Document, items: List<RTransaction>) {

        val table = Table(
            UnitValue.createPointArray(
                floatArrayOf(
                    100f,
                    180f,
                    80f,
                    80f,
                    80f,
                    100f
                )
            )
        )

        // headers
        //table.addCell(Paragraph("S.N.O.").setBold())
        table.addCell(Paragraph("Item").setBold())
        table.addCell(Paragraph("Customer").setBold())
        table.addCell(Paragraph("Qty").setBold())
        table.addCell(Paragraph("Price/Q").setBold())
        table.addCell(Paragraph("Total").setBold())
        table.addCell(Paragraph("Date").setBold())

        // items
        for (a in items) {
//            table.addCell(Paragraph(a.SNO.toString() + ""))
            table.addCell(Paragraph(a.itemName + ""))
            table.addCell(Paragraph(a.custName + ""))
            table.addCell(Paragraph(a.quantity.toString() + ""))
            table.addCell(Paragraph(a.pricePerUnit.toString() + ""))
            table.addCell(Paragraph((a.quantity * a.pricePerUnit).toString() + ""))
            table.addCell(Paragraph(a.transactionDateStr + ""))
        }
        layoutDocument.add(table)
    }

    private fun addEmptyLine(layoutDocument: Document, number: Int) {
        for (i in 0 until number) {
            layoutDocument.add(Paragraph(" "))
        }
    }

    private fun addDebitCredit(layoutDocument: Document, info: RPdfGeneratorModel) {

        val table = Table(
            UnitValue.createPointArray(
                floatArrayOf(
                    100f,
                    160f
                )
            )
        )

        table.addCell(Paragraph("Total Credit").setBold())
        table.addCell(Paragraph(info.totalCredit + ""))
        table.addCell(Paragraph("Total Debit").setBold())
        table.addCell(Paragraph(info.totalDebit + ""))
        table.addCell(Paragraph("Total Profit").setBold())
        table.addCell(Paragraph(info.totalProfit + ""))

        layoutDocument.add(table)
    }

    private fun addSubHeading(layoutDocument: Document, text: String) {
        layoutDocument.add(
            Paragraph(text).setBold()
                .setTextAlignment(TextAlignment.CENTER)
        )
    }

    private fun addLink(layoutDocument: Document, text: String) {

        val blueText: Text = Text(text)
            .setFontColor(ColorConstants.BLUE)
            .setFont(PdfFontFactory.createFont(StandardFonts.HELVETICA_BOLD))

        layoutDocument.add(
            Paragraph(blueText)
                .setAction(PdfAction.createURI(text))
                .setTextAlignment(TextAlignment.CENTER)
                .setUnderline()
                .setItalic()
        )
    }

    private fun addTitle(layoutDocument: Document, text: String) {
        layoutDocument.add(
            Paragraph(text).setBold().setUnderline()
                .setTextAlignment(TextAlignment.CENTER)
        )
    }
}

RPdfGeneratorModel

class RPdfGeneratorModel(list: List<RTransaction>, header: String) {

    var list = emptyList<RTransaction>()
    var header = ""
    var totalCredit = ""
    var totalDebit = ""
    var totalProfit = ""

    init {
        this.list = list
        this.header = header
        calculateTotal(list)
    }

    private fun calculateTotal(items: List<RTransaction>) {
        val totalPlus = items.map {
            if (it.transType == RTransactionType.plus) {
                it.totalPrice
            } else { 0.0 }
        }.sum()

        val totalMinus = items.map {
            if (it.transType == RTransactionType.minus) {
                it.totalPrice
            } else { 0.0 }
        }.sum()

        val final = totalPlus - totalMinus
        totalDebit = "-" + totalMinus.toString()
        totalCredit = totalPlus.toString()
        totalProfit = final.toString()
    }
}

RTransaction 模型

enum class RTransactionType { plus, minus }

class RTransaction {

    var itemName: String = ""
    var custName: String = ""
    var transType: RTransactionType = RTransactionType.plus
    var pricePerUnit: Double = 0.0
    var quantity: Int = 0
    var totalPrice: Double = 0.0
    var transactionDateStr: String = ""

    constructor() {
    }
}

在活动类中编写以下函数以创建虚拟数据

private fun dummyModel(): RPdfGeneratorModel {
        val list = dummyTransactions()
        val header = "Statement"
        val dummy = RPdfGeneratorModel(list, header)
        return dummy
    }

    private fun dummyTransactions(): List<RTransaction> {

        val list = arrayListOf<RTransaction>()

        val i1 = RTransaction()
        i1.custName = "Johan Store"
        i1.itemName = "Snacks"
        i1.quantity = 4
        i1.pricePerUnit = 40.0
        i1.totalPrice = i1.quantity * i1.pricePerUnit
        i1.transactionDateStr = "10 Sep, 20"
        i1.transType = RTransactionType.plus
        list.add(i1)


        val i2 = RTransaction()
        i2.custName = "Alice Store"
        i2.itemName = "Chocolate"
        i2.quantity = 3
        i2.pricePerUnit = 79.0
        i2.totalPrice = i2.quantity * i2.pricePerUnit
        i2.transactionDateStr = "9 Sep, 20"
        i2.transType = RTransactionType.plus
        list.add(i2)

        val i3 = RTransaction()
        i3.custName = "Alexa Mall"
        i3.itemName = "Shoes"
        i3.quantity = 2
        i3.pricePerUnit = 177.0
        i3.totalPrice = i3.quantity * i3.pricePerUnit
        i3.transactionDateStr = "9 Sep, 20"
        i3.transType = RTransactionType.minus
        list.add(i3)

        val i4 = RTransaction()
        i4.custName = "Zainab Baba"
        i4.itemName = "Chips"
        i4.quantity = 5
        i4.pricePerUnit = 140.0
        i4.totalPrice = i4.quantity * i4.pricePerUnit
        i4.transactionDateStr = "8 Sep, 20"
        i4.transType = RTransactionType.plus
        list.add(i4)

        list.add(i1)
        list.add(i2)
        list.add(i3)
        list.add(i4)

        list.add(i1)
        list.add(i2)
        list.add(i3)
        list.add(i4)


        return list
    }

现在调用 RPdfGenerator 函数。请确保在调用之前请求 WRITE_EXTERNAL_STORAGE 权限。有关更多详细信息，请查看示例项目

val dummyInfo = dummyModel()
                RPdfGenerator.generatePdf(this, dummyInfo)