是否可以在 Android 中将文本转换为 PDF？

Question

我想通过我的应用程序创建一个 PDF 文件，并希望通过电子邮件将 PDF 文件作为附件发送。在安卓中可以吗？如果是，请说明如何。

Answer 1

这里是代码

    Document doc = new Document();
    PdfWriter.getInstance(doc, new FileOutputStream("urgentz.pdf"));
    doc.open();
    Image image = Image.getInstance ("urgentzImageahslkdhaosd.jpg");
    doc.add(new Paragraph("Your text blah bleh"));
    doc.add(image);               
    doc.close();

在您的 android 项目中使用 iText 库

Answer 2

1. 在 gradle.build 文件中写入以下依赖项implementation 'com.itextpdf:itextg:5.5.10'
2. 在 AndroidManifest 中 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
3. 在 MainActivity 中编写以下代码

---

public class MainActivity extends AppCompatActivity { 
Button save;
EditText text;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    save=(Button)findViewById(R.id.save);
    text=(EditText)findViewById(R.id.text);
    save.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(Build.VERSION.SDK_INT> Build.VERSION_CODES.M)
            {
                if(checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)== PackageManager.PERMISSION_DENIED)
                {
                    String[] parmission={Manifest.permission.WRITE_EXTERNAL_STORAGE};
                    requestPermissions(parmission,1000);
                }
                else savepdf();
            }
            else savepdf();
        }
    });
}
private  void savepdf()
{
    Document doc=new Document();
    String mfile=new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.getDefault()).format(System.currentTimeMillis());
    String mfilepath= Environment.getExternalStorageDirectory()+"/"+mfile+".pdf";
    Font smallBold=new Font(Font.FontFamily.TIMES_ROMAN,12,Font.BOLD);
    try{
        PdfWriter.getInstance(doc,new FileOutputStream(mfilepath));
        doc.open();
        String mtext=text.getText().toString();
        doc.addAuthor("harikesh");
        doc.add(new Paragraph(mtext,smallBold));
        doc.close();
        Toast.makeText(this, ""+mfile+".pdf"+" is saved to "+mfilepath, Toast.LENGTH_SHORT).show();
    }
    catch (Exception e)
    {
        Toast.makeText(this,"This is Error msg : " +e.getMessage(), Toast.LENGTH_SHORT).show();
    }

}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    switch (requestCode)
    {
        case  1000:
            if(grantResults.length>0 && grantResults[0]== PackageManager.PERMISSION_GRANTED)
            {
                savepdf();
            }
            else Toast.makeText(this, "parmission denied..", Toast.LENGTH_SHORT).show();
    }
}
}`

Answer 3

iText 库使用。 请参考答案Here。

iText 示例很多。下面参考网站。 http://www.geek-tutorials.com/java/itext/insert_control_text.php

Answer 4

创建pdf就是这么简单

如果您使用的是android studio，首先下载droidText.0.2.jar 并添加gradle 文件和libs 文件夹。然后为 PDF 编写此代码

public void createPDF() {
        Document doc = new Document();


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

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

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

            //This is for random name
            number = new ArrayList<Integer>();
            for (int i = 1; i <= 10; ++i) number.add(i);
            Collections.shuffle(number);

            File file = new File(dir, "Document" + number + ".pdf");
            FileOutputStream fOut = new FileOutputStream(file);
            PdfWriter.getInstance(doc, fOut);

            //open the document
            doc.open();

            Paragraph p1 = new Paragraph("TENANTS : " + tenants.getText().toString());
            Font paraFont = new Font(Font.COURIER);
            p1.setAlignment(Paragraph.ALIGN_CENTER);
            p1.setFont(paraFont);

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

            Paragraph p2 = new Paragraph("OFFFER NUMBER : " + offer_number.getText().toString());
            Font paraFont2 = new Font(Font.COURIER, 14.0f, Color.GREEN);
            p2.setAlignment(Paragraph.ALIGN_CENTER);
            p2.setFont(paraFont2);

            doc.add(p2);

            Paragraph p3 = new Paragraph("OFFFER NUMBER : " + offer_number.getText().toString());
            Font paraFont3 = new Font(Font.COURIER, 14.0f, Color.GREEN);
            p3.setAlignment(Paragraph.ALIGN_CENTER);
            p3.setFont(paraFont2);

            doc.add(p3);

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

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

            //set footer
            Phrase footerText = new Phrase("ADUREC DOCUMENT");
            HeaderFooter pdfFooter = new HeaderFooter(footerText, true);
            doc.setFooter(pdfFooter);

//            Toast.makeText(getApplicationContext(), "success pdf", Toast
//                    .LENGTH_LONG).show();

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

    }

Answer 5

Kotlin 示例代码：

您可以使用以下代码创建 pdf 页面并在画布中绘制任何内容。

fun createPdf(textToPdf: String) {

    // create a new document
    val document = PdfDocument()

    // crate a page description
    var pageInfo: PdfDocument.PageInfo = PdfDocument.PageInfo.Builder(300, 600, 1).create()

    // start a page
    var page: PdfDocument.Page = document.startPage(pageInfo)
    var canvas = page.canvas
    var paint = Paint()
    paint.color = Color.RED
    canvas.drawCircle(50F, 50F, 30F, paint)
    paint.color = Color.BLACK
    canvas.drawText(textToPdf, 80F, 50F, paint)
    //canvas.drawt
    // finish the page
    document.finishPage(page)
    // draw text on the graphics object of the page

    // Create Page 2
    pageInfo = PdfDocument.PageInfo.Builder(300, 600, 2).create()
    page = document.startPage(pageInfo)
    canvas = page.canvas
    paint = Paint()
    paint.color = Color.BLUE
    canvas.drawCircle(100F, 100F, 100F, paint)
    document.finishPage(page)

    // write the document content
    val directory_path = Environment.getExternalStorageDirectory().path + "/mypdf/"
    val file = File(directory_path)
    if (!file.exists()) {
        file.mkdirs()
    }
    val targetPdf = directory_path + "test-2.pdf"
    val filePath = File(targetPdf)
    try {
        document.writeTo(FileOutputStream(filePath))
        Toast.makeText(mContext, "Done", Toast.LENGTH_LONG).show()
    } catch (e: IOException) {
        Log.e("main", "error " + e.toString())
        Toast.makeText(mContext, "Something wrong: " + e.toString(), Toast.LENGTH_LONG).show()
    }

    // close the document
    document.close()
    //isPrinting = false
}

注意：

别忘了加external storage write permission