Question

我创建了一个Android Invoice应用。生成的发票是具有嵌套视图的标准Android布局。我正在寻找一个可用于将此视图转换为pdf文档的库。

我很惊讶在我的搜索中没有直接的选项或者也许我已经完成了最后的第一件事。或者也许我正在寻找的是不可能的。

请有人帮我指点一个工具，它可以帮助我从Android视图转换或生成PDF。我愿意接受免费且适度的付费选择。或者让我知道我所寻找的是不可能的。

Answer 1

在您的设备上截屏：

Bitmap screen;
View v1 = MyView.getRootView();
v1.setDrawingCacheEnabled(true);
screen= Bitmap.createBitmap(v1.getDrawingCache());
v1.setDrawingCacheEnabled(false);

如果您以ScrollView作为根视图，那么：

LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
RelativeLayout root = (RelativeLayout) inflater.inflate(R.layout.activity_main, null); //RelativeLayout is root view of my UI(xml) file.
root.setDrawingCacheEnabled(true);
Bitmap screen= getBitmapFromView(this.getWindow().findViewById(R.id.relativelayout)); // here give id of our root layout (here its my RelativeLayout's id)

以下是getBitmapFromView()方法：

public static Bitmap getBitmapFromView(View view) {
    //Define a bitmap with the same size as the view
    Bitmap returnedBitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(),Bitmap.Config.ARGB_8888);
    //Bind a canvas to it
    Canvas canvas = new Canvas(returnedBitmap);
    //Get the view's background
    Drawable bgDrawable =view.getBackground();
    if (bgDrawable!=null) 
        //has background drawable, then draw it on the canvas
        bgDrawable.draw(canvas);
    else 
        //does not have background drawable, then draw white background on the canvas
        canvas.drawColor(Color.WHITE);
    // draw the view on the canvas
    view.draw(canvas);
    //return the bitmap
    return returnedBitmap;
}

它将显示整个屏幕，包括隐藏在ScrollView中的内容。现在我们有了位图屏幕，让我们将其保存为pdf（您必须下载itextpdf-5.3.2.jar文件并附加到您的项目中..）

private static String FILE = "mnt/sdcard/invoice.pdf"; // add permission in your manifest...

try 
{
    Document document = new Document();

    PdfWriter.getInstance(document, new FileOutputStream(FILE));
    document.open();
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    screen.compress(Bitmap.CompressFormat.PNG, 100, stream);
    byte[] byteArray = stream.toByteArray();
    addImage(document,byteArray);
    document.close();
}

catch (Exception e) 
{
    e.printStackTrace();
}

private static void addImage(Document document,byte[] byteArray) 
{
    try 
    {
        image = Image.getInstance(byteArray);  
    } 
    catch (BadElementException e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    catch (MalformedURLException e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    catch (IOException e) 
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
     // image.scaleAbsolute(150f, 150f);
      try 
      {
        document.add(image);
    } catch (DocumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

没有测试任何东西。以下是我使用的所有来源：source1，source2，source3。

Answer 2

您可以使用自定义库，例如https://github.com/HendrixString/Android-PdfMyXml。我比其他任何方法都更喜欢这个库。只需通过这些。

但还有另一种方法 - 如何将Android视图转换为PDF - 生成包含布局位图的pdf

Answer 3

我做了library以实现此目标（从Java View对象获取PDF）。

主要代码段是-

 PdfGenerator.getBuilder()
                        .setContext(context)
                        .fromViewSource()
                        .fromView(targetView) /* "targetView" is the view ,you want to convert PDF */
            /* "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)*/
                
                            }
                        });

Answer 4

无需使用第三方库，您可以使用Android API 19中引入的PdfDocument。但是，请记住，pdf文件的尺寸应在后记点（1/72英寸）内。因此，在绘制到画布之前，必须转换视图的尺寸以符合要求。

如何将Android View转换为PDF

4 个答案: