将android布局转换为PDF文件

Question

How to convert android layout to PDF file. Is it possible?.
If that is possible how to proceed to convert the android layout to PDF.
suggestions are welcome. Thanks in advance.

Answer 1

I have tried many ways.
Finally got an answer Using this library https://mvnrepository.com/artifact/com.itextpdf/itextpdf/5.0.6
Layout to image and place it in pdf

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfWriter;

String dirpath;
public void layoutToImage(View view) {
    // get view group using reference  
    relativeLayout = (RelativeLayout) view.findViewById(R.id.print);
    // convert view group to bitmap
    relativeLayout.setDrawingCacheEnabled(true);
    relativeLayout.buildDrawingCache();
    Bitmap bm = relativeLayout.getDrawingCache();
    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/jpeg");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

    File f = new File(Environment.getExternalStorageDirectory() + File.separator + "image.jpg");
    try {
        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());
    } catch (IOException e) {
        e.printStackTrace();
    }

}
public void imageToPDF() throws FileNotFoundException {
    try {
        Document document = new Document();
        dirpath = android.os.Environment.getExternalStorageDirectory().toString();
        PdfWriter.getInstance(document, new FileOutputStream(dirpath + "/NewPDF.pdf")); //  Change pdf's name.
        document.open();
        Image img = Image.getInstance(Environment.getExternalStorageDirectory() + File.separator + "image.jpg");  
        float scaler = ((document.getPageSize().getWidth() - document.leftMargin()
                - document.rightMargin() - 0) / img.getWidth()) * 100; 
        img.scalePercent(scaler);
        img.setAlignment(Image.ALIGN_CENTER | Image.ALIGN_TOP);
        document.add(img);
        document.close();
        Toast.makeText(this, "PDF Generated successfully!..", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {

    }
}

Answer 2

您可以使用自定义库，例如https://github.com/HendrixString/Android-PdfMyXml但这里解释了另一种方法 - 如何将 Android 视图转换为 PDF - 生成包含布局位图的 pdf

Answer 3

The above answer is correct, it throws an Exception error at the following line.

 bm.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

Bcoz of this line of code return null

  Bitmap bm = relativeLayout.getDrawingCache();

So I have done some more research on Bitmap coming null.I use this method which first converts view to Image. Then you can use above function ie imageToPDF() which works well.Below is my method.

 public void convertCertViewToImage()
 {

        scrollView.setDrawingCacheEnabled(true);
        scrollView.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        scrollView.layout(0, 0, scrollView.getMeasuredWidth(), scrollView.getMeasuredHeight());
        scrollView.buildDrawingCache();
        Bitmap bm = Bitmap.createBitmap(scrollView.getDrawingCache());
        scrollView.setDrawingCacheEnabled(false); // clear drawing cache
        Intent share = new Intent(Intent.ACTION_SEND);
        share.setType("image/jpg");

        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.JPEG, 100, bytes);

        File f = new File(getExternalFilesDir(null).getAbsolutePath() + File.separator + "Certificate" + File.separator + "myCertificate.jpg");

        f.createNewFile();
        FileOutputStream fo = new FileOutputStream(f);
        fo.write(bytes.toByteArray());

} 

Answer 4

I made a library to achieve this objective.

The main code snippet is -

 PdfGenerator.getBuilder()
                        .setContext(context)
                        .fromLayoutXMLSource()
                        .fromLayoutXML(R.layout.layout_print,R.layout.layout_print)
            /* "fromLayoutXML()" takes array of layout resources.
             * You can also invoke "fromLayoutXMLList()" method here which takes list of layout resources instead of array. */
                        .setDefaultPageSize(PdfGenerator.PageSize.A4)
            /* It takes default page size like A4,A5. You can also set custom page size in pixel
             * by calling ".setCustomPageSize(int widthInPX, int heightInPX)" here. */
                        .setFileName("Test-PDF")
            /* It is file name */
                        .setFolderName("FolderA/FolderB/FolderC")
            /* It is folder name. If you set the folder name like this pattern (FolderA/FolderB/FolderC), then
             * FolderA creates first.Then FolderB inside FolderB and also FolderC inside the FolderB and finally
             * the pdf file named "Test-PDF.pdf" will be store inside the FolderB. */
                        .openPDFafterGeneration(true)
            /* It true then the generated pdf will be shown after generated. */
                        .build(new PdfGeneratorListener() {
                            @Override
                            public void onFailure(FailureResponse failureResponse) {
                                super.onFailure(failureResponse);
                /* If pdf is not generated by an error then you will findout the reason behind it
                 * from this FailureResponse. */
                            }

                            @Override
                            public void showLog(String log) {
                                super.showLog(log);
                /*It shows logs of events inside the pdf generation process*/ 
                            }

                            @Override
                            public void onSuccess(SuccessResponse response) {
                                super.onSuccess(response);
                /* If PDF is generated successfully then you will find SuccessResponse 
                 * which holds the PdfDocument,File and path (where generated pdf is stored)*/
                
                            }
                        });