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总览：

Aspose.Pdf for Android 的其中一些高级功能：

平台独立性：

Aspose.Pdf for Android 可以被用于如下平台：

支持的文件格式：

Aspose.Pdf for Android 除了让你操作PDF文档，还能转换各种文件格式为PDF或将PDF文件呈现为各种输出格式。如下表格简述了支持类型：

常规用途：

• 创建新的PDF文档；

• 转换图像为PDF；

• 添加文本和图像到PDF文档；

• 当添加文本到PDF文档时，操作文本的样式及格式。

• 插入、提取、分离和连接PDF文档；

• 在生成PDF期间添加页眉和页脚；

• 创建、导入、导出或删除书签；

• 添加、修改、提取或删除附件和注释；

• 在PDF生成期间或之后，添加、更新、移除安全限制。

• 在创建PDF时设置PDF加密和密码；

• 加密、解密、添加或移除PDF密码信息；

• 从FDF、XML和XFDF创建、更新、移除、导入或导出表单字段数据。

• 从PDF文档添加或移除水印；

• 创建多个基于列的PDF文档；

• 设置PDF文档的页面边界、尺寸、方向、转换类型、缩放系数和外观；

• 分离PDF文档为单页文档。

PDF文档创建和操作功能：

Aspose.Pdf for Android提供创建新的和操作现有PDF文档的功能。有了Aspose.Pdf for Android你可以转换图像或简单文本文件为PDF格式，也可以在生成PDF期间指定XMP元数据、作者详细资料、创建者详细资料和标题信息。

Aspose.Pdf for Android功能相当丰富。允许你在同一个文档中为不同的标题指定不同的书签级别，设置压缩机别，默认文档打开行为（适合页面还是适合框），文档打开方式或甚至缩略图/书签的外观。你可以设置页面方向，定义文档缩放系数。

当你需要编辑或操作现有PDF文档时，Aspose.Pdf for Android允许你连接或合并PDF文档，附加新的页面到现有PDF文件，提取页面、插入页面在特殊的位置，分离一个PDF为两个或更多PDF文档，或创建n-up's（页数多于单页）和小册子。

你还可以添加XMP元数据信息诸如CreateDate、CreatorTool、ModifyDate 和MetaDataDate 到PDF文档或改变现有元信息如标题、作者名、页眉、关键字等等。

部分和段落功能：

Aspose.Pdf for Android允许你指定一个文档中每一页的页面/边缘尺寸，还可以设置页面背景图像、页眉和页脚。

其它功能包括：创建、更新或删除书签、创建或删除文件附件和注释。添加浮框绝对定位的浮动框而非浮动图层。

图形图像功能：

Aspose.Pdf for Android 支持很多不同的图形，图形可以被绘制于坐标指定的任何页面位置，图形还可以被按需旋转和缩放。

Aspose.Pdf for Android 图像可以从磁盘或内存插入到文档中，web图像可以通过提供其URL被添加，连同常见图像类型、CCITT（fax）图像、多页TIFF图像和透明GIF图像也被支持。

 你可以以原始尺寸或自定义尺寸将图像放置在主文档部分、表格单元格内或页眉/页脚部分。连同添加图像的功能，你可以替换、提取或删除PDF文档中现有的图像。当生成新的PDF文档或替换现有文档时，还能将图像作为水印添加。

超链接和附件功能：

Aspose.Pdf for Android 允许你添加超链接快捷方式到PDF文档中的其它页面。超链接到其它PDF文档的页面，超链接到无PDF文件以及超链接到web地址，连同超链接创建，即能够从PDF文档中提取超链接。

能够能够添加、更新、导入导出或删除附件和注释。任何类型的图像都可以附加于PDF文档和注释类型诸如多边形、折线、弹窗、插入符号、自由文本等等。你可以指定注释弹窗的具体位置和尺寸，还可以指定图标类型、坐标和不透明度值。

表单字段功能：

Aspose.Pdf for Android 为表单字段处理提供高级功能。你能够添加表单字段到PDF文档或者以编程方式移动、重命名、移除和复制表单字段。Aspose.Pdf for Android还能指定表单属性诸如READ_ONLY、REQUIRED、NO_EXPORT、HIDDEN、NOZOOM或者你可以轻易指定视觉属性，如字段对齐、边界峰哥、按钮峰哥、字体尺寸、文本颜色、文本编码等等。

安全性：

Aspose.Pdf for Android提供40位或128位PDF文档加密，PDF文档中的内容修改（如内容复制、PDF打印、注释修改等）都可以被限制。还允许你通过使用PKCS#1、PKCS#7 和PKCS#7分离的签名类型和数字证书来更深层地提升PDF安全机制，可以指定证书级别并设置图形外观。

Common Uses

• Creating new PDF documents.
• Converting an image to PDF.
• Adding text and images to a PDF document.
• Manipulating text styles and formatting when adding it to a PDF document.
• Inserting, extracting, splitting, and concatenating PDF documents.
• Adding headers and footers during PDF generation.
• Creating, importing, exporting and deleting bookmarks.
• Adding, modifying, extracting and deleting attachments and annotations from PDF creation.
• Adding, updating, removing security constraints during and after PDF generation.
• Setting PDF encryption and passwords during PDF creation.
• Encrypting, decrypting, adding and removing password information from PDF document.
• Creating, updating, removing, importing and exporting form field data from FDF, XML and XFDF files.
• Add and remove watermarks from PDF document
• Creating multiple column based PDF documents.
• Setting page margin, size, orientation, transition type, zoom factor and appearance of PDF documents.
• Splitting PDF document into single page documents.

PDF Document Creation and Manipulation Features

Aspose.Pdf for Android offers the capability to create new and manipulate existing PDF documents. With Aspose.Pdf you can transform image or simple text files into PDF format. You can also specify XMP metadata, author details, creator details, and title information during PDF generation. 

Aspose.Pdf for Android is feature rich. It allows you to specify different bookmark levels for different headings in a document, set the compression level of the document, default document open action (fit to page or fit box), document open mode or even the appearance to thumbnails or bookmarks. You can also set page orientation from portrait to landscape and define the document zoom factor. To control how the file displays you can specify different page transition effects such as dissolve or box.

This component is a good choice when you need to edit or manipulate existing PDF documents. It allows you to concatenate or merge PDF documents, append new pages to an existing PDF file, extract pages, insert pages at a particular location in an existing PDF file, split one PDF into two or more PDF documents or create n-up's (number of pages over single page) and booklets.

With this robust product, you can also add XMP metadata information such as CreateDate, CreatorTool, ModifyDate and MetaDataDate to PDF documents or change existing meta information like title, author name, header, keywords, subject etc.

Section and Paragraph Features

Aspose.Pdf for Android allows you to specify page size and the page margin size of each page in a document. Page background images, page header and footer sections can also be set. 

Other features include: create, update or delete bookmarks, create or delete file attachments and annotations, add floating box with absolute positioning rather than flow layout and much more.

Text Features

With Aspose.Pdf for Android text alignment, for example right, left, center, justify or full justify, can be applied to text within a PDF document. You can create left hanging text paragraphs, preserve whitespace in text, set or inherit text format from child nodes of the PDF DOM (Document Object Model), formatting the text in all segments of a document. You can even change text to underline, over-line or strikeout.

As well as specifying horizontal text alignment, you can also specify vertical alignment of text segments, for example baseline or topline. Text foreground and background colors can be changed, you can use replaceable symbols which allow you to change the corresponding text content at runtime. 

Right-to-left languages such as Arabic, Hebrew and Urdu are supported. Nonetheless, text extraction, replacement and insertion of new text inside an existing PDF document, are some of the great features features offered by this component.

Graph and Imaging Capabilities

Aspose.Pdf for Android provides support for many different types of graph, graphs can be drawn on any page location specified by coordinates and graphs can be also rotated and scaled to suit your requirements.

With Aspose.Pdf for Android, images can be inserted into documents from disk or memory, web images can also be added by providing their URL. Along with conventional image types, CCITT (fax) images, multi-page TIFF images and transparent GIF images are also supported.

You get the capability to place image in its original size or you can specify custom dimensions and place it inside main document section, inside a table cell or in the header or footer sections. Along with the feature of adding images, you can also replace, extract or delete images already present in a PDF document. Get the privilege to add images as watermark when generating a new PDF document or place one over an existing document.

Hyperlink and Attachments Features

Aspose.Pdf for Android allows you to add hyperlink shortcuts to other pages within a PDF document, hyperlinks to pages in other PDF documents, hyperlinks to non-PDF files as well as hyperlinks to web locations. Along with hyperlink creation, get the capabilities to extract hyperlinks from a PDF document. 

Get the power to add, update, import, export or delete attachments and annotations. Files of any type can be attached to a PDF document and annotation types such as polygon, polyline, pop-up, rubber stamp, caret, free text and many more can be added. You can specify the exact position and the size of the note's popup window. You may also specify icon type, coordinates and opacity values. 

Form Field Features

Aspose.Pdf for Android provides advanced features for form field processing. With this single product, you get the capabilities to add form fields to the PDF document or you can programmatically move, rename, remove and copy form fields across PDF documents, set JavaScript for buttons and flatten form fields. Aspose.Pdf is also great when it comes to specifying field attributes such as READ_ONLY, REQUIRED, NO_EXPORT, HIDDEN, NOZOOM or you can easily specify visual attributes such as field Alignment, BorderStyle, ButtonStyle, FontSize, TextColor, TextEncoding or define custom positioning to place form fields at absolute position within document.

Platform Independence

Aspose.Pdf for Android is compatible with Android 2.0 OS and higher.

Security Features

Aspose.Pdf for Android offers the facility to encrypt PDF documents with either 40-bit or 128-bit encryption, master and user passwords can also be set for further PDF security. Content modification in PDF documents such as content copying, PDF printing, form field completion, degraded printing, annotation modification as well as PDF document assembly can all be restricted by using Aspose.Pdf for Android.

This component also allows you to further improve PDF security mechanism by using PKCS#1, PKCS#7 and PKCS#7 detached signature types and with the use of digital certificate. You may also specify the certificate level and set the graphical appearance of the signature.