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Android使用iText7生成PDF文件_android com.itextpdf

作者：菜鸟追梦旅行 | 2024-03-26 19:25:56

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android com.itextpdf

一：添加依赖

implementation 'com.itextpdf:itext7-core:7.1.13'

二：清单文件AndroidManifest.xml

添加权限

  1. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
  2. <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
  3. <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>

在<application>中添加

android:requestLegacyExternalStorage="true"

添加provider

  1. <provider
  2.     android:name="androidx.core.content.FileProvider"
  3.     android:authorities="com.example.demo.fileprovider"
  4.     android:exported="false"
  5.     android:grantUriPermissions="true">
  6.     <meta-data
  7.          android:name="android.support.FILE_PROVIDER_PATHS"
  8.          android:resource="@xml/provider_paths" />
  9. </provider>

在res目录下新建xml目录，并创建provider_paths.xml文件

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

三：文件工具类FileUtils

  1. package com.example.demo;
  2.  
  3. import android.content.ActivityNotFoundException;
  4. import android.content.Context;
  5. import android.content.Intent;
  6. import android.content.pm.PackageManager;
  7. import android.content.pm.ResolveInfo;
  8. import android.net.Uri;
  9. import android.widget.Toast;
  10.  
  11. import androidx.core.content.FileProvider;
  12.  
  13. import java.io.File;
  14. import java.io.IOException;
  15. import java.util.List;
  16.  
  17. public class FileUtils {
  18.  
  19.     /**
  20.      * 获取包含文件的应用程序路径
  21.      *
  22.      * @return String 根目录路径
  23.      */
  24.     public static String getAppPath() {
  25.         File dir = new File(android.os.Environment.getExternalStorageDirectory()
  26.                 + File.separator
  27.                 + "PDF"
  28.                 + File.separator);
  29.         if (!dir.exists()) {
  30.             dir.mkdirs();
  31.         }
  32.         return dir.getPath() + File.separator;
  33.     }
  34.  
  35.     /**
  36.      * 打开PDF文件
  37.      * @param context
  38.      * @param url
  39.      * @throws ActivityNotFoundException
  40.      * @throws IOException
  41.      */
  42.     public static void openFile(Context context, File url) throws ActivityNotFoundException {
  43.         if (url.exists()) {
  44.             Uri uri = FileProvider.getUriForFile(context, context.getApplicationContext().getPackageName() + ".fileprovider", url);
  45.  
  46.             String urlString = url.toString().toLowerCase();
  47.  
  48.             Intent intent = new Intent(Intent.ACTION_VIEW);
  49.             intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
  50.             /**
  51.              * Security
  52.              */
  53.             List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
  54.             for (ResolveInfo resolveInfo : resInfoList) {
  55.                 String packageName = resolveInfo.activityInfo.packageName;
  56.                 context.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
  57.             }
  58.  
  59.             // 通过比较url和扩展名，检查您要打开的文件类型。
  60.             // 当if条件匹配时，插件设置正确的意图(mime)类型
  61.             // 所以Android知道用什么程序打开文件
  62.             if (urlString.toLowerCase().contains(".doc")
  63.                     || urlString.toLowerCase().contains(".docx")) {
  64.                 // Word document
  65.                 intent.setDataAndType(uri, "application/msword");
  66.             } else if (urlString.toLowerCase().contains(".pdf")) {
  67.                 // PDF file
  68.                 intent.setDataAndType(uri, "application/pdf");
  69.             } else if (urlString.toLowerCase().contains(".ppt")
  70.                     || urlString.toLowerCase().contains(".pptx")) {
  71.                 // Powerpoint file
  72.                 intent.setDataAndType(uri, "application/vnd.ms-powerpoint");
  73.             } else if (urlString.toLowerCase().contains(".xls")
  74.                     || urlString.toLowerCase().contains(".xlsx")) {
  75.                 // Excel file
  76.                 intent.setDataAndType(uri, "application/vnd.ms-excel");
  77.             } else if (urlString.toLowerCase().contains(".zip")
  78.                     || urlString.toLowerCase().contains(".rar")) {
  79.                 // ZIP file
  80.                 intent.setDataAndType(uri, "application/trap");
  81.             } else if (urlString.toLowerCase().contains(".rtf")) {
  82.                 // RTF file
  83.                 intent.setDataAndType(uri, "application/rtf");
  84.             } else if (urlString.toLowerCase().contains(".wav")
  85.                     || urlString.toLowerCase().contains(".mp3")) {
  86.                 // WAV/MP3 audio file
  87.                 intent.setDataAndType(uri, "audio/*");
  88.             } else if (urlString.toLowerCase().contains(".gif")) {
  89.                 // GIF file
  90.                 intent.setDataAndType(uri, "image/gif");
  91.             } else if (urlString.toLowerCase().contains(".jpg")
  92.                     || urlString.toLowerCase().contains(".jpeg")
  93.                     || urlString.toLowerCase().contains(".png")) {
  94.                 // JPG file
  95.                 intent.setDataAndType(uri, "image/jpeg");
  96.             } else if (urlString.toLowerCase().contains(".txt")) {
  97.                 // Text file
  98.                 intent.setDataAndType(uri, "text/plain");
  99.             } else if (urlString.toLowerCase().contains(".3gp")
  100.                     || urlString.toLowerCase().contains(".mpg")
  101.                     || urlString.toLowerCase().contains(".mpeg")
  102.                     || urlString.toLowerCase().contains(".mpe")
  103.                     || urlString.toLowerCase().contains(".mp4")
  104.                     || urlString.toLowerCase().contains(".avi")) {
  105.                 // Video files
  106.                 intent.setDataAndType(uri, "video/*");
  107.             } else {
  108.                 // 如果你愿意，你也可以为任何其他文件定义意图类型
  109.                 // 另外，使用下面的else子句来管理其他未知扩展
  110.                 // 在这种情况下，Android将显示设备上安装的所有应用程序
  111.                 // 因此您可以选择使用哪个应用程序
  112.                 intent.setDataAndType(uri, "*/*");
  113.             }
  114.             intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  115.             context.startActivity(intent);
  116.         } else {
  117.             Toast.makeText(context, "文件不存在", Toast.LENGTH_SHORT).show();
  118.         }
  119.     }
  120. }

四：权限工具类Permissions

  1. package com.example.demo;
  2.  
  3. import android.app.AlertDialog;
  4. import android.content.Context;
  5. import android.content.DialogInterface;
  6. import android.content.Intent;
  7. import android.net.Uri;
  8. import android.provider.Settings;
  9.  
  10. public class Permissions {
  11.  
  12.     /**
  13.      * 弹出权限提示框
  14.      */
  15.     public static void showPermissionsSettingDialog(Context context, String permission) {
  16.         String msg = "";
  17.         if (permission.equals("android.permission.READ_EXTERNAL_STORAGE") ||
  18.                 permission.equals("android.permission.WRITE_EXTERNAL_STORAGE")) {
  19.             msg= "本App需要“允许储存空间”权限才能正常运行，请点击确定，进入设置界面进行授权处理";
  20.         }
  21.         AlertDialog.Builder builder = new AlertDialog.Builder(context);
  22.         builder.setMessage(msg);
  23.         builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
  24.             @Override
  25.             public void onClick(DialogInterface dialog, int which) {
  26.                 showSettings(context);
  27.             }
  28.         });
  29.         builder.setCancelable(false);
  30.         builder.show();
  31.     }
  32.  
  33.     /**
  34.      * 如果授权失败，就要进入App权限设置界面
  35.      */
  36.     public static void showSettings(Context context) {
  37.         Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
  38.         Uri uri = Uri.fromParts("package", context.getPackageName(), null);
  39.         intent.setData(uri);
  40.         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
  41.         context.startActivity(intent);
  42.     }
  43. }

五：布局文件activity_main.xml

  1. <?xml version="1.0" encoding="utf-8"?>
  2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3.     xmlns:tools="http://schemas.android.com/tools"
  4.     android:layout_width="match_parent"
  5.     android:layout_height="match_parent"
  6.     android:gravity="center"
  7.     android:orientation="vertical"
  8.     tools:context=".MainActivity">
  9.  
  10.     <Button
  11.         android:id="@+id/create_pdf"
  12.         android:layout_width="wrap_content"
  13.         android:layout_height="wrap_content"
  14.         android:text="生成PDF文件"
  15.         android:layout_marginTop="100dp"
  16.         android:layout_marginBottom="30dp"/>
  17.  
  18.     <Button
  19.         android:id="@+id/open_pdf"
  20.         android:layout_width="wrap_content"
  21.         android:layout_height="wrap_content"
  22.         android:text="打开PDF文件"/>
  23.  
  24. </LinearLayout>

六：使用iText7生成PDF文件，并打开PDF文件

  1. package com.example.demo;
  2.  
  3. import androidx.annotation.NonNull;
  4. import androidx.annotation.Nullable;
  5. import androidx.appcompat.app.AppCompatActivity;
  6. import androidx.core.app.ActivityCompat;
  7. import androidx.core.content.ContextCompat;
  8.  
  9. import android.Manifest;
  10. import android.app.AlertDialog;
  11. import android.content.Context;
  12. import android.content.DialogInterface;
  13. import android.content.Intent;
  14. import android.content.pm.PackageManager;
  15. import android.os.Build;
  16. import android.os.Bundle;
  17. import android.os.Environment;
  18. import android.os.Handler;
  19. import android.provider.Settings;
  20. import android.util.Log;
  21. import android.view.View;
  22. import android.widget.Button;
  23. import android.widget.Toast;
  24. import com.itextpdf.kernel.colors.Color;
  25. import com.itextpdf.kernel.colors.DeviceRgb;
  26. import com.itextpdf.kernel.font.PdfFont;
  27. import com.itextpdf.kernel.font.PdfFontFactory;
  28. import com.itextpdf.kernel.geom.PageSize;
  29. import com.itextpdf.kernel.pdf.PdfDocument;
  30. import com.itextpdf.kernel.pdf.PdfDocumentInfo;
  31. import com.itextpdf.kernel.pdf.PdfWriter;
  32. import com.itextpdf.kernel.pdf.canvas.draw.SolidLine;
  33. import com.itextpdf.layout.Document;
  34. import com.itextpdf.layout.element.LineSeparator;
  35. import com.itextpdf.layout.element.Paragraph;
  36. import com.itextpdf.layout.element.Text;
  37. import com.itextpdf.layout.property.TextAlignment;
  38.  
  39. import java.io.File;
  40. import java.io.FileNotFoundException;
  41. import java.io.FileOutputStream;
  42. import java.io.IOException;
  43.  
  44. public class MainActivity extends AppCompatActivity {
  45.     private Button create_pdf;
  46.     private Button open_pdf;
  47.     private String path;
  48.     private Context context;
  49.     private boolean isPermissions = false;
  50.  
  51.     @Override
  52.     protected void onCreate(Bundle savedInstanceState) {
  53.         super.onCreate(savedInstanceState);
  54.         setContentView(R.layout.activity_main);
  55.  
  56.         requestPermission();
  57.  
  58.         initView();
  59.     }
  60.  
  61.     private void initView() {
  62.         create_pdf = findViewById(R.id.create_pdf);
  63.         open_pdf = findViewById(R.id.open_pdf);
  64.  
  65.         context = getApplicationContext();
  66.         path = FileUtils.getAppPath() + "test.pdf";
  67.         Log.e("pdf保存路径", path);
  68.  
  69.         create_pdf.setOnClickListener(new View.OnClickListener() {
  70.             @Override
  71.             public void onClick(View v) {
  72.                 createPDF(path);
  73.             }
  74.         });
  75.  
  76.         open_pdf.setOnClickListener(new View.OnClickListener() {
  77.             @Override
  78.             public void onClick(View v) {
  79.                 openPDF();
  80.             }
  81.         });
  82.     }
  83.  
  84.     /**
  85.      * 创建PDF文件
  86.      */
  87.     private void createPDF(String path) {
  88.         if (isPermissions) {
  89.             File file = new File(path);
  90.             if (file.exists()) {
  91.                 file.delete();
  92.             }
  93.             file.getParentFile().mkdirs();
  94.  
  95.             // 创建Document
  96.             PdfWriter writer = null;
  97.             try {
  98.                 writer = new PdfWriter(new FileOutputStream(path));
  99.             } catch (FileNotFoundException e) {
  100.                 Log.e("FileNotFoundException", e.toString());
  101.             }
  102.  
  103.             PdfDocument pdf_document = new PdfDocument(writer);
  104.             // 生成的PDF文档信息
  105.             PdfDocumentInfo info = pdf_document.getDocumentInfo();
  106.             // 标题
  107.             info.setTitle("First pdf file");
  108.             // 作者
  109.             info.setAuthor("Quinto");
  110.             // 科目
  111.             info.setSubject("test");
  112.             // 关键词
  113.             info.setKeywords("pdf");
  114.             // 创建日期
  115.             info.setCreator("2022-10-20");
  116.  
  117.             Document document = new Document(pdf_document, PageSize.A4, true);
  118.  
  119.             // 文字字体（显示中文）、大小、颜色
  120.             PdfFont font = null;
  121.             try {
  122.                 font = PdfFontFactory.createFont("STSong-Light","UniGB-UCS2-H");
  123.             } catch (IOException e) {
  124.                 Log.e("IOException", e.toString());
  125.             }
  126.             float title_size = 36.0f;
  127.             float text_title_size = 30.0f;
  128.             float text_size = 24.0f;
  129.             Color title_color = new DeviceRgb(0, 0, 0);
  130.             Color text_title_color = new DeviceRgb(65, 136, 160);
  131.             Color text_color = new DeviceRgb(43, 43, 43);
  132.  
  133.             // 行分隔符
  134.             // 实线：SolidLine()  点线：DottedLine()  仪表盘线：DashedLine()
  135.             LineSeparator separator = new LineSeparator(new SolidLine());
  136.             separator.setStrokeColor(new DeviceRgb(0, 0, 68));
  137.  
  138.             // 添加大标题
  139.             Text title = new Text("这里是pdf文件标题").setFont(font).setFontSize(title_size).setFontColor(title_color);
  140.             Paragraph paragraph_title = new Paragraph(title).setTextAlignment(TextAlignment.CENTER);
  141.             document.add(paragraph_title);
  142.  
  143.             for (int i = 1; i < 10; i++) {
  144.                 // 添加文本小标题
  145.                 Text text_title = new Text("第" + i + "行：").setFont(font).setFontSize(text_title_size).setFontColor(text_title_color);
  146.                 Paragraph paragraph_text_title = new Paragraph(text_title);
  147.                 document.add(paragraph_text_title);
  148.  
  149.                 // 添加文本内容
  150.                 String content = "我是文本内容" + i + i + i + i + i + i + i + i + i + i;
  151.                 Text text = new Text(content).setFont(font).setFontSize(text_size).setFontColor(text_color);
  152.                 Paragraph paragraph_text = new Paragraph(text);
  153.                 document.add(paragraph_text);
  154.  
  155.                 // 添加可换行空间
  156.                 document.add(new Paragraph(""));
  157.                 // 添加水平线
  158.                 document.add(separator);
  159.                 // 添加可换行空间
  160.                 document.add(new Paragraph(""));
  161.             }
  162.  
  163.                 /**
  164.                  * 添加列表
  165.                  */
  166.                 List list = new List().setSymbolIndent(12).setListSymbol("\u2022").setFont(font);
  167.                 list.add(new ListItem("列表1"))
  168.                         .add(new ListItem("列表2"))
  169.                         .add(new ListItem("列表3"));
  170.                 document.add(list);
  171.  
  172.                 /**
  173.                  * 添加图片
  174.                  */
  175.                 Text text_image = new Text("图片：").setFont(font).setFontSize(text_title_size).setFontColor(text_title_color);
  176.                 Paragraph image = new Paragraph(text_image);
  177.                 document.add(image);
  178.                 Image image1 = null;
  179.                 Image image2 = null;
  180.                 Image image3 = null;
  181.                 try {
  182.                     image1 = new Image(ImageDataFactory.create("/storage/emulated/0/DCIM/Camera/IMG_20221003_181926.jpg")).setWidth(PageSize.A4.getWidth() * 2 / 3);
  183.                     image2 = new Image(ImageDataFactory.create("/storage/emulated/0/Download/互传/folder/证件/XHS_159716343059020494b83-da6a-39d7-ae3b-13fd92cfbb53.jpg")).setWidth(PageSize.A4.getWidth() / 3) ;
  184.                     image3 = new Image(ImageDataFactory.create("/storage/emulated/0/Download/互传/folder/证件/XHS_1597163520524f0b4df77-8db1-35c6-9dfa-3e0aa74f1fef.jpg")).setWidth(PageSize.A4.getWidth() / 3);
  185.                 } catch (MalformedURLException e) {
  186.                     Log.e("MalformedURLException", e.toString());
  187.                 }
  188.                 Paragraph paragraph_image = new Paragraph().add(image1)
  189.                         .add("  ")
  190.                         .add(image2)
  191.                         .add("  ")
  192.                         .add(image3);
  193.                 document.add(paragraph_image);
  194.                 document.add(new Paragraph(""));
  195.  
  196.                 /**
  197.                  * 添加表格
  198.                  */
  199.                 Text text_table = new Text("表单：").setFont(font).setFontSize(text_title_size).setFontColor(text_title_color);
  200.                 Paragraph paragraph_table = new Paragraph(text_table);
  201.                 document.add(paragraph_table);
  202.                 // 3列
  203.                 float[] pointColumnWidths = {100f, 100f, 100f};
  204.                 Table table = new Table(pointColumnWidths);
  205.                 // 设置边框样式、颜色、宽度
  206.                 Color table_color = new DeviceRgb(80, 136, 255);
  207.                 Border border = new DottedBorder(table_color, 3);
  208.                 table.setBorder(border);
  209.                 // 设置单元格文本居中
  210.                 table.setTextAlignment(TextAlignment.CENTER);
  211.                 // 添加单元格内容
  212.                 Color table_header = new DeviceRgb(0, 0, 255);
  213.                 Color table_content = new DeviceRgb(255, 0, 0);
  214.                 Color table_footer = new DeviceRgb(0, 255, 0);
  215.                 Text text1 = new Text("姓名").setFont(font).setFontSize(20.0f).setFontColor(table_header);
  216.                 Text text2 = new Text("年龄").setFont(font).setFontSize(20.0f).setFontColor(table_header);
  217.                 Text text3 = new Text("性别").setFont(font).setFontSize(20.0f).setFontColor(table_header);
  218.                 table.addHeaderCell(new Paragraph(text1));
  219.                 table.addHeaderCell(new Paragraph(text2));
  220.                 table.addHeaderCell(new Paragraph(text3));
  221.                 Text text4 = new Text("张三").setFont(font).setFontSize(15.0f).setFontColor(table_content);
  222.                 Text text5 = new Text("30").setFont(font).setFontSize(15.0f).setFontColor(table_content);
  223.                 Text text6 = new Text("男").setFont(font).setFontSize(15.0f).setFontColor(table_content);
  224.                 table.addCell(new Paragraph(text4));
  225.                 table.addCell(new Paragraph(text5));
  226.                 table.addCell(new Paragraph(text6));
  227.                 Text text7 = new Text("丽萨").setFont(font).setFontSize(15.0f).setFontColor(table_footer);
  228.                 Text text8 = new Text("20").setFont(font).setFontSize(15.0f).setFontColor(table_footer);
  229.                 Text text9 = new Text("女").setFont(font).setFontSize(15.0f).setFontColor(table_footer);
  230.                 table.addFooterCell(new Paragraph(text7));
  231.                 table.addFooterCell(new Paragraph(text8));
  232.                 table.addFooterCell(new Paragraph(text9));
  233.                 // 将表格添加进pdf文件
  234.                 document.add(table);
  235.  
  236.                 /**
  237.                  * 添加页眉、页脚、水印
  238.                  */
  239.                 Rectangle pageSize;
  240.                 PdfCanvas canvas;
  241.                 int n = pdf_document.getNumberOfPages();
  242.                 for (int i = 1; i <= n; i++) {
  243.                     PdfPage page = pdf_document.getPage(i);
  244.                     pageSize = page.getPageSize();
  245.                     canvas = new PdfCanvas(page);
  246.                     // 页眉
  247.                     canvas.beginText().setFontAndSize(font, 7)
  248.                             .moveText(pageSize.getWidth() / 2 - 18, pageSize.getHeight() - 10)
  249.                             .showText("我是页眉")
  250.                             .endText();
  251.  
  252.                     // 页脚
  253.                     canvas.setStrokeColor(text_color)
  254.                             .setLineWidth(.2f)
  255.                             .moveTo(pageSize.getWidth() / 2 - 30, 20)
  256.                             .lineTo(pageSize.getWidth() / 2 + 30, 20).stroke();
  257.                     canvas.beginText().setFontAndSize(font, 7)
  258.                             .moveText(pageSize.getWidth() / 2 - 6, 10)
  259.                             .showText(String.valueOf(i))
  260.                             .endText();
  261.  
  262.                     // 水印
  263.                     Paragraph p = new Paragraph("Quinto").setFontSize(60);
  264.                     canvas.saveState();
  265.                     PdfExtGState gs1 = new PdfExtGState().setFillOpacity(0.2f);
  266.                     canvas.setExtGState(gs1);
  267.                     document.showTextAligned(p, pageSize.getWidth() / 2, pageSize.getHeight() / 2,
  268.                             pdf_document.getPageNumber(page),
  269.                             TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
  270.                     canvas.restoreState();
  271.                 }
  272.  
  273.             // 关闭
  274.             document.close();
  275.             Toast.makeText(this, "PDF文件已生成", Toast.LENGTH_SHORT).show();
  276.         } else {
  277.             requestPermission();
  278.         }
  279.     }
  280.  
  281.     /**
  282.      * 打开PDF文件
  283.      */
  284.     private void openPDF() {
  285.         new Handler().postDelayed(new Runnable() {
  286.             @Override
  287.             public void run() {
  288.                 try {
  289.                     FileUtils.openFile(context, new File(path));
  290.                 } catch (Exception e) {
  291.                     Log.e("Exception", e.toString());
  292.                 }
  293.             }
  294.         }, 1000);
  295.     }
  296.  
  297.     /**
  298.      * 动态申请权限
  299.      */
  300.     private void requestPermission() {
  301.         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
  302.             // 先判断有没有权限
  303.             if (Environment.isExternalStorageManager()) {
  304.                 isPermissions = true;
  305.             } else {
  306.                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
  307.                 builder.setMessage("生成PDF文件需要“允许所有文件访问”权限才能正常运行，请点击确定，进入设置界面进行授权处理");
  308.                 builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
  309.                     @Override
  310.                     public void onClick(DialogInterface dialog, int which) {
  311.                         startActivityForResult(new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION), 1024);
  312.                     }
  313.                 });
  314.                 builder.setCancelable(false);
  315.                 builder.show();
  316.  
  317.             }
  318.         } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
  319.             // 先判断有没有权限
  320.             if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED &&
  321.                     ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
  322.                 isPermissions = true;
  323.             } else {
  324.                 ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1024);
  325.             }
  326.         } else {
  327.             isPermissions = true;
  328.         }
  329.     }
  330.  
  331.     @Override
  332.     public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
  333.         super.onRequestPermissionsResult(requestCode, permissions, grantResults);
  334.         if (requestCode == 1024) {
  335.             if (ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED &&
  336.                     ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
  337.                 isPermissions = true;
  338.             } else {
  339.                 //拒绝就要强行跳转设置界面
  340.                 Permissions.showPermissionsSettingDialog(this, permissions[0]);
  341.             }
  342.         }
  343.     }
  344.  
  345.     @Override
  346.     protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent intent) {
  347.         super.onActivityResult(requestCode, resultCode, intent);
  348.         if (requestCode == 1024 && Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
  349.             if (Environment.isExternalStorageManager()) {
  350.                 isPermissions = true;
  351.             } else {
  352.                 Toast.makeText(context, "存储权限获取失败", Toast.LENGTH_SHORT).show();
  353.             }
  354.         }
  355.     }
  356. }

七：生成的PDF文件预览图

 

 

 

 

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