以全长创建 RecyclerView 的 PDF

Question

我想创建活动“整页”的 PDF。该视图包含一个包含许多项目的 RecyclerView。

我可以获取 Recyclerview 的完整尺寸，但文件仅绘制当前视图。这是我的代码：

    public void tela (){ // create a new document
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)

    {
        PdfDocument document = new PdfDocument();

        getScreenshotFromRecyclerView(mRecyclerView);
        content = mRecyclerView;
        content.setBackgroundColor(Color.parseColor("#303030"));


        PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(wil,
                height, 1).create();

    // create a new page from the PageInfo
        PdfDocument.Page page = document.startPage(pageInfo);

    // repaint the user's text into the page
        content.draw(page.getCanvas());

    // do final processing of the page
        document.finishPage(page);

    // saving pdf document to sdcard
        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy - HH-mm-ss",Locale.getDefault());
        String pdfName = "Revisões_"
                + sdf.format(Calendar.getInstance().getTime()) + ".pdf";

    // all created files will be saved at path /sdcard/PDFDemo_AndroidSRC/
        File outputFile = new File(Environment.getExternalStorageDirectory().getPath(), pdfName);

        try {
            outputFile.createNewFile();
            OutputStream out = new FileOutputStream(outputFile);
            document.writeTo(out);
            document.close();
            out.close();
            Toast.makeText(this,"PDF gerado com sucesso",Toast.LENGTH_SHORT).show();
            Log.i("Gerou", "pdf");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

// 获取限制

    public void getScreenshotFromRecyclerView(RecyclerView view) {
    RecyclerView.Adapter adapter = view.getAdapter();
    if (adapter != null) {
        int size = adapter.getItemCount();

        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());
            height += holder.itemView.getMeasuredHeight();
        }
        wil=view.getMeasuredWidth();


    }
}

结果是这样的：

我可以使用我的 Recyclerview 的所有值创建 pdf 吗？

谢谢。

Answer 1

我实现了一个帮助类来处理保存到 PDF 的图像。在方法 saveImageToPDF() 我通过：

• 一个 TabLayout，位于我的 recyclerView 上方
• recyclerView 的 Bitmap
• 上下文

为了得到recyclerView Bitmap，我使用了这个Take a screenshot of RecyclerView in FULL length

public class PDFHelper {

    private File mFolder;
    private File mFile;
    private Context mContext;

    public PDFHelper(File folder, Context context) {

        this.mContext = context;
        this.mFolder = folder;

        if(!mFolder.exists())
            mFolder.mkdirs();
    }

    public void saveImageToPDF(View title, Bitmap bitmap, String filename) {

        mFile = new File(mFolder, filename + ".pdf");
        if (!mFile.exists()) {
            int height = title.getHeight() + bitmap.getHeight();
            PdfDocument document = new PdfDocument();
            PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(bitmap.getWidth(), height, 1).create();
            PdfDocument.Page page = document.startPage(pageInfo);
            Canvas canvas = page.getCanvas();
            title.draw(canvas);

            canvas.drawBitmap(bitmap, null, new Rect(0, title.getHeight(), bitmap.getWidth(),bitmap.getHeight()), null);

            document.finishPage(page);

            try {
                mFile.createNewFile();
                OutputStream out = new FileOutputStream(mFile);
                document.writeTo(out);
                document.close();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }
}

Answer 2

我找到了一种更简单的方法。我不确定我的代码是否干净或者这是正确的方法。我有一个可变大小的回收站视图。我想以 pdf 格式打印整个回收站视图。我也使用 IText Pdf 仅供参考。

我做过的事情。 下面是回收站视图中单个项目的 XML 文件。请注意，当我使用卡片视图时，我已经为卡片视图提供了一个 ID（您可以使用任何您想要的作为根、LinearLayout 或 RelativeLayout 等）android:id="@+id/preview_order_list_card_root"

    <?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/preview_order_list_card_root"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:layout_marginBottom="5dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="5dp">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <ImageView
                    android:layout_width="50dp"
                    android:layout_height="50dp"
                    android:layout_gravity="center_horizontal"
                    android:src="@drawable/car"/>

                <TextView
                    android:layout_width="1dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:background="@android:color/darker_gray"
                    android:text="12"/>

                <TextView
                    android:id="@+id/preview_car_name"
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginTop="7dp"
                    android:gravity="center"
                    android:textSize="20sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/preview_car_model"
                    android:layout_width="90dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:gravity="center"/>

            </LinearLayout>

            <TextView
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:background="@android:color/darker_gray"/>

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/preview_part_name"
                    android:layout_width="100dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginTop="7dp"
                    android:gravity="center"
                    android:textSize="20sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/preview_part_model"
                    android:layout_width="100dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginBottom="7dp"
                    android:gravity="center"/>

                <TextView
                    android:layout_width="1dp"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:background="@android:color/darker_gray"
                    android:text="12"/>

                <ImageView
                    android:layout_width="50dp"
                    android:layout_height="50dp"
                    android:layout_gravity="center_horizontal"
                    android:src="@drawable/car_part"/>

            </LinearLayout>

            <TextView
                android:layout_width="1dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="5dp"
                android:background="@android:color/darker_gray"/>

            <LinearLayout
                android:layout_width="70dp"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginLeft="5dp"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/preview_quantity"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textColor="@android:color/holo_green_light"
                    android:gravity="center"
                    android:textSize="25sp"
                    android:layout_gravity="center"/>

                <TextView
                    android:id="@+id/preview_quantity_bucket"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_marginTop="15dp"
                    android:gravity="center"/>

            </LinearLayout>

        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:layout_margin="15dp"
            android:orientation="vertical">

            <TextView
                android:id="@+id/preview_extra_info"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerVertical="true"
                android:gravity="center"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:layout_marginTop="15dp">

                <TextView
                    android:id="@+id/preview_ordered_from"
                    android:layout_width="100dp"
                    android:layout_height="wrap_content"
                    android:textColor="@android:color/holo_red_light"/>

                <TextView
                    android:id="@+id/preview_list_price"
                    android:layout_width="100dp"
                    android:layout_height="wrap_content"
                    android:gravity="center"/>

                <TextView
                    android:id="@+id/preview_list_less"
                    android:layout_width="80dp"
                    android:layout_height="wrap_content"
                    android:gravity="right"/>

            </LinearLayout>

        </LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

现在在您的适配器中创建一个带有 getter 和 setter 的数组列表，当它调用 onBindViewHolder 时将保存卡片视图对象，如下所示。

private static ArrayList<CardView> cardViewArrayList = new ArrayList<>();

@Override
    public void onBindViewHolder(final PreviewOrderAdapter.MyViewHolder holder, int position)
    {
        OrderItemDetailsModel orderItemDetailsModel = namesArrList.get(position);
        holder.orderedFrom.setText(orderItemDetailsModel.getOrderedFrom());
        holder.listPrice.setText(orderItemDetailsModel.getListPrice());
        holder.listLess.setText(orderItemDetailsModel.getListLess());

        // ADDING THE CARD VIEW OBJECT IN THE ARRAYLIST
        addCardView(holder.cardView);
    }

    @Override
    public int getItemCount()
    {
        return namesArrList.size();
    }

    private static void addCardView(CardView cardView)
    {
        cardViewArrayList.add(cardView);
    }

    public static ArrayList<CardView> getCardViewList()
    {
        return cardViewArrayList;
    }

现在最后，在打印回收站视图时执行此操作。

//Getting the card view array list from the adapter above
ArrayList<CardView> cardViewArrayList = adapter.getCardViewList();
                for (int i = 0; i < cardViewArrayList.size(); i++)
                {
                    // Iterate till the last of the array list and add each view individually to the document.
                    addContent(document, cardViewArrayList.get(i));
                }

//Adding the content to the document
private void addContent(Document document, View view)
            throws DocumentException
    {
        try
        {
            view.buildDrawingCache();

            Bitmap bmp = view.getDrawingCache();

            ByteArrayOutputStream stream = new ByteArrayOutputStream();
            bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
            Image image = Image.getInstance(stream.toByteArray());
            image.scalePercent(70);
            image.setAlignment(Image.MIDDLE);
            document.add(image);
        }
        catch (Exception ex)
        {
            Log.e("TAG-ORDER PRINT ERROR", ex.getMessage());
        }
    }

通过这种方式，我们不必担心由于回收器视图的大尺寸而导致的内存泄漏，因为我们将每个视图单独添加到文档中。