如何将Android View转换为PDF [英] How to convert Android View to PDF

问题描述

我创建了一个Android发票应用.生成的发票是带有嵌套视图的标准Android布局.我正在寻找一个可用于将该视图转换为pdf文档的库.

I have created an Android Invoice app. The generated invoice is standard Android layout with nested views. I am looking for a library that I can use to convert this view to an pdf document.

令我惊讶的是，我的搜索中没有直截了当的选择，或者也许我已经做完了第一件事.也许我要找的东西是不可能的.

I am surprised there is no straight forward option coming up in my search or Perhaps I have the done the first thing last. Or perhaps what I am looking for is not possible.

请有人帮我指出一个可以帮助我从Android视图转换或生成PDF的工具.我对免费和适度的付费选项持开放态度.或者让我知道，如果我找不到想要的东西.

Would someone please help point me to a tool that will help me convert or generate a PDF from an Android view. I am open to free and modest paid option. Or let me know is if what I am looking for is not possible.

推荐答案

在设备上查看屏幕:

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

如果您将ScrollView作为根视图，则:

If you're having ScrollView as root view then:

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)

这是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.)

It will display entire screen including content hidden in your ScrollView. Now that we have our bitmap screen let's save it to pdf (you have to download itextpdf-5.3.2.jar file and attach in your project..)

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.这是我使用过的所有资源: source1 ， source2 ，

Haven't tested anything. Here are all the sources I used: source1, source2, source3.

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