Creating PDF file using iText from a Recyclerview (Entire items inside) in Android?

Question

Hi i was trying to create a PDF output file from a Recyclerview using the library iText . After hours of struggle i was able to create PDF from recylerview .

Followi

Answer 1

You saved my day. But i had to change this line :

image.scalePercent(70);
image.setAlignment(Image.MIDDLE);

with this :

float scaler = ((document.getPageSize().getWidth() - document.leftMargin()
                    - document.rightMargin() - 0) / image.getWidth()) * 100; // 0 means you have no indentation. If you have any, change it.
            image.scalePercent(scaler);
            image.setAlignment(com.itextpdf.text.Image.ALIGN_CENTER | com.itextpdf.text.Image.ALIGN_TOP);

Thank a lot

Answer 2

After hours of trail and error i found the answer . I am sharing the code snippets as it may be helpful for some else

     public void generatePDF(RecyclerView view) {

    RecyclerView.Adapter adapter = view.getAdapter();
    Bitmap bigBitmap = null;
    if (adapter != null) {
        int size = adapter.getItemCount();
        int height = 0;
        Paint paint = new Paint();
        int iHeight = 0;
        final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);

        // Use 1/8th of the available memory for this memory cache.
        final int cacheSize = maxMemory / 8;
        LruCache<String, Bitmap> bitmaCache = new LruCache<>(cacheSize);
        for (int i = 0; i < size; i++) {
            RecyclerView.ViewHolder holder = adapter.createViewHolder(view, adapter.getItemViewType(i));
            adapter.onBindViewHolder(holder, i);
            holder.itemView.measure(View.MeasureSpec.makeMeasureSpec(view.getWidth(), View.MeasureSpec.EXACTLY),
                    View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
            holder.itemView.layout(0, 0, holder.itemView.getMeasuredWidth(), holder.itemView.getMeasuredHeight());
            holder.itemView.setDrawingCacheEnabled(true);
            holder.itemView.buildDrawingCache();
            Bitmap drawingCache = holder.itemView.getDrawingCache();
            if (drawingCache != null) {

                bitmaCache.put(String.valueOf(i), drawingCache);
            }

            height += holder.itemView.getMeasuredHeight();
        }

        bigBitmap = Bitmap.createBitmap(view.getMeasuredWidth(), height, Bitmap.Config.ARGB_8888);
        Canvas bigCanvas = new Canvas(bigBitmap);
        bigCanvas.drawColor(Color.WHITE);

        Document document = new Document(PageSize.A4);
        final File file = new File(getStorageDir("PDF"), "print.pdf");
        try {
            PdfWriter.getInstance(document, new FileOutputStream(file));
        } catch (DocumentException | FileNotFoundException e) {
            e.printStackTrace();
        }

        for (int i = 0; i < size; i++) {

            try {
                //Adding the content to the document
                Bitmap bmp = bitmaCache.get(String.valueOf(i));
                ByteArrayOutputStream stream = new ByteArrayOutputStream();
                bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
                Image image = Image.getInstance(stream.toByteArray());
                 float scaler = ((document.getPageSize().getWidth() - document.leftMargin()
                - document.rightMargin() - 0) / image.getWidth()) * 100; // 0 means you have no indentation. If you have any, change it.
                image.scalePercent(scaler);
                image.setAlignment(com.itextpdf.text.Image.ALIGN_CENTER | com.itextpdf.text.Image.ALIGN_TOP);
                if (!document.isOpen()) {
                    document.open();
                }
                document.add(image);

            } catch (Exception ex) {
                Log.e("TAG-ORDER PRINT ERROR", ex.getMessage());
            }
        }

        if (document.isOpen()) {
            document.close();
        }
        // Set on UI Thread
        runOnUiThread(new Runnable() {
            @Override
            public void run() {

                AlertDialog.Builder builder = new AlertDialog.Builder(Index.this);
                builder.setTitle("Success")
                        .setMessage("PDF File Generated Successfully.")
                        .setIcon(android.R.drawable.ic_dialog_alert)
                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                                Intent intent = new Intent(Intent.ACTION_VIEW);
                                intent.setDataAndType(Uri.fromFile(file), "application/pdf");
                                intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
                                startActivity(intent);
                            }

                        }).show();
            }
        });

    }

}