add signature or image on PDF using drag and drop android (get x and y coordinates )

问题

I am using Pdfbox https://github.com/TomRoush/PdfBox-Android to add signature(image) on pdf i want to add signature using drag and drop i have implemented some code using touch listener please see and help me i am not getting exact x and y coordinates to add it in pdfbox code from touch listener and i also try drag and drop codehttps://www.tutorialspoint.com/android/android_drag_and_drop.htm but it won't help. when i test the app and drop the signature(image) on pdf the result pdf won't get the signature on right position. please help your little brother and guide me if anything wrong with the code

Here is the code of Pdfbox

 private void createPdfTwo(File file,float x,float y) {
        try {
          PDDocument doc = PDDocument.load(file);          
           PDPage page = doc.getPages().get(0);  
          // StoredPath is the path where it gonna be saved
            PDImageXObject pdImage = PDImageXObject.createFromFile(StoredPath,doc);
            PDPageContentStream contents = new PDPageContentStream(doc, page,true,false);
        // here is the x,y which i am getting from touch listener
            contents.drawImage(pdImage, x, y,150,150);
            contents.close();
            doc.save(storedPath);
            doc.close();
            pdfView.fromFile(new File(storedPath)).load();
            imageView.setVisibility(View.GONE);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

here is the touch listener code

 @SuppressLint("ClickableViewAccessibility")
private View.OnTouchListener onTouchListener()
{
    return (view, event) -> {

        final int x = (int) event.getRawX();
        final int y = (int) event.getRawY();

        switch (event.getAction() & MotionEvent.ACTION_MASK) {

            case MotionEvent.ACTION_DOWN:
                RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams)
                        view.getLayoutParams();

                xDelta = x - lParams.leftMargin;
                yDelta = y - lParams.topMargin;
                break;
            case MotionEvent.ACTION_UP:
          // here is the code where magic should happen                                 
         RelativeLayout.LayoutParams qParams = (RelativeLayout.LayoutParams)
                        view.getLayoutParams();
             float   xD = x - qParams.leftMargin;
              float  yD = y - qParams.topMargin;
          // this method will calling the create pdf (file is defined global)
                createPdfTwo(file,xD,yD);
                Toast.makeText(MainActivity.this,
                        "Signature Drop", Toast.LENGTH_SHORT)
                        .show();
                break;

            case MotionEvent.ACTION_MOVE:
                RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view
                        .getLayoutParams();
                layoutParams.leftMargin = x - xDelta;
                layoutParams.topMargin = y - yDelta;
                layoutParams.rightMargin = 0;
                layoutParams.bottomMargin = 0;
                view.setLayoutParams(layoutParams);
                break;
        }
        mainLayout.invalidate();
        return true;
    };
}

}

来源：https://stackoverflow.com/questions/58039018/add-signature-or-image-on-pdf-using-drag-and-drop-android-get-x-and-y-coordinat