使用PdfDocument在android中生成具有自定义大小的PDF [英] Generating a PDF with custom size in android with PdfDocument

问题描述

PdfDocument 是一个类，可以生成一个来自Android视图的PDF.您只需将视图添加到PdfDocument，然后将PDF保存到内存中即可.

PdfDocument is a class that makes it possible to generate a PDF from an Android View. You simply add a View to PdfDocument and then save the PDF to memory.

但是，我不想添加已经在屏幕上呈现的视图，因为这样的视图仅适用于智能手机屏幕，并且我想为打印机生成PDF文档.

However, I wouldn't like to add a View that is already rendered in the screen, because such View is only good for smartphone screens, and I want to generate a PDF document for printers.

因此，我想传递一个不渲染的视图.虽然我当然可以这样做，但是如何确定尺寸和比例呢?如何在我的PDF中控制它?

Therefore, I want to pass a View without rendering. While it's certainly possible for me to do that, how would the dimensions and proportions be decided? How can I control this in my PDF?

更新:

按照以下clotodex的回答，我做了:

Following the answer below from clotodex, I did:

    LayoutInflater inflater = getLayoutInflater();
    View linearview;
    linearview = inflater.inflate(R.layout.printed_order,
                                  findViewById(android.R.id.content),
                                  false);

    PdfDocument document = new PdfDocument();
    PdfDocument.PageInfo pageInfo = new PdfDocument.PageInfo.Builder(2480, 3508, 0).create();
    PdfDocument.Page page = document.startPage(pageInfo);

    linearview.draw(page.getCanvas());
    document.finishPage(page);

    OutputStream outStream;
    File file = new File(getExternalFilesDir(null), "pedido.PDF");

    try {
        outStream = new FileOutputStream(file);
        document.writeTo(outStream);
        document.close();
        outStream.flush();
        outStream.close();

但是我得到一个空的PDF.如果我这样做

but I get an empty PDF. If I do

View view = findViewById(android.R.id.content);
view.draw(page.getCanvas());

代替

linearview.draw(page.getCanvas()); 

我得到了我正在进行的活动，这证实了所有事情都是严谨的，除了我要打印的视图之外.

I get the activity I'm in, which confirms everything is rigth, except for the view that I'm trying to print.

推荐答案

看看这个问题在Android中，视图的尺寸由父级布局给出. 这意味着您可以使用所需的尺寸创建新的布局，并使用attachToRoot=false和root=your_new_layout扩展视图.

In Android the measurements for a view are given by the parent layout. This means you can create a new layout with your desired measurements and inflate your view with attachToRoot=false and root=your_new_layout.

渲染视图后，现在就可以像将渲染的视图绘制为pdf一样进行操作(按照链接中的说明进行操作，或者在绘制到页面画布之前将其转换为位图).

When you have rendered the view you can now proceed as you would with drawing a rendered view to pdf (following the instruction in your link or converting it to a bitmap before drawing to the page canvas).

这篇关于使用PdfDocument在android中生成具有自定义大小的PDF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！