android: 通过Intent筛选多种类型文件

一般使用setType()方法来实现文件过滤，如：只显示PDF文件：

     int requestCode = 100;
     Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
     intent.setType("application/pdf");
     intent.addCategory(Intent.CATEGORY_OPENABLE);
     startActivityForResult(intent, requestCode);

但如果要指定多种类型呢，同时要指定pdf,excel,word,ppt这些类型的文件，那要怎样设置呢？

指定多种类型文件

在网上查了，有些答案是

错误方式1——setType中进行拼接：

intent.setType(“video/*;image/*”);//同时选择视频和图片

错误方式2——调用多次setType：

intent.setType("video/*");
intent.setType("image/*");

这两种方式都是错误的
我们看下源码

/**
     * Set an explicit MIME data type.
     *
     * This is used to create intents that only specify a type and not data,
     * for example to indicate the type of data to return.
     *
     * 
This method automatically clears any data that was
     * previously set (for example by {@link #setData}).
     *
     * Note: MIME type matching in the Android framework is
     * case-sensitive, unlike formal RFC MIME types.  As a result,
     * you should always write your MIME types with lower case letters,
     * or use {@link #normalizeMimeType} or {@link #setTypeAndNormalize}
     * to ensure that it is converted to lower case.
     *
     * @param type The MIME type of the data being handled by this intent.
     *
     * @return Returns the same Intent object, for chaining multiple calls
     * into a single statement.
     *
     * @see #getType
     * @see #setTypeAndNormalize
     * @see #setDataAndType
     * @see #normalizeMimeType
     */
    public Intent setType(String type) {
        mData = null;
        mType = type;
        return this;
    }

我们可以看到，setType每次都是重新赋值，没有添加到list和数组中，因此这两种方式是实现不了指定多种类型文件的。
既然这种方式实现不了，那么Intent会不会提供字段以便我们传递过滤数据，我们通过官方文档及源码，发现Intent提供了EXTRA_MIME_TYPES这个字段来传递，而且是数组类型：

/**
     * Extra used to communicate a set of acceptable MIME types. The type of the
     * extra is {@code String[]}. Values may be a combination of concrete MIME
     * types (such as "image/png") and/or partial MIME types (such as
     * "audio/*").
     *
     * @see #ACTION_GET_CONTENT
     * @see #ACTION_OPEN_DOCUMENT
     */
    public static final String EXTRA_MIME_TYPES = "android.intent.extra.MIME_TYPES";

因此结果就简单了,我们要指定ppt,word,excel,pdf类型的文件，代码如下

public static void openDirChooseFile(Activity activity, int requestCode, String[] mimeTypes) {
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        if (mimeTypes != null) {
            intent.putExtra(Intent.EXTRA_MIME_TYPES, mimeTypes);
        }
        intent.setType("*/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        // intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);//多选
        activity.startActivityForResult(intent, requestCode);
    }
 public static void chooseFile(Activity activity, int requestCode) {
        String[] mimeTypes = {MimeType.DOC, MimeType.DOCX, MimeType.PDF, MimeType.PPT, MimeType.PPTX, MimeType.XLS, MimeType.XLSX};
        FileUtil.openDirChooseFile(activity, requestCode, mimeTypes);
    }

MimeType文件

public class MimeType {
    public static final String DOC = "application/msword";
    public static final String DOCX = "application/vnd.openxmlformats-officedocument.wordprocessingml.document";
    public static final String XLS = "application/vnd.ms-excel application/x-excel";
    public static final String XLSX = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    public static final String PPT = "application/vnd.ms-powerpoint";
    public static final String PPTX = "application/vnd.openxmlformats-officedocument.presentationml.presentation";
    public static final String PDF = "application/pdf";
}

MimeType 文件列表参考

扩展名	文档类型	MIME 类型
`.aac`	AAC audio	`audio/aac`
`.abw`	AbiWord document	`application/x-abiword`
`.arc`	Archive document (multiple files embedded)	`application/x-freearc`
`.avi`	AVI: Audio Video Interleave	`video/x-msvideo`
`.azw`	Amazon Kindle eBook format	`application/vnd.amazon.ebook`
`.bin`	Any kind of binary data	`application/octet-stream`
`.bmp`	Windows OS/2 Bitmap Graphics	`image/bmp`
`.bz`	BZip archive	`application/x-bzip`
`.bz2`	BZip2 archive	`application/x-bzip2`
`.csh`	C-Shell script	`application/x-csh`
`.css`	Cascading Style Sheets (CSS)	`text/css`
`.csv`	Comma-separated values (CSV)	`text/csv`
`.doc`	Microsoft Word	`application/msword`
`.docx`	Microsoft Word (OpenXML)	`application/vnd.openxmlformats-officedocument.wordprocessingml.document`
`.eot`	MS Embedded OpenType fonts	`application/vnd.ms-fontobject`
`.epub`	Electronic publication (EPUB)	`application/epub+zip`
`.gif`	Graphics Interchange Format (GIF)	`image/gif`
`.htm
.html`	HyperText Markup Language (HTML)	`text/html`
`.ico`	Icon format	`image/vnd.microsoft.icon`
`.ics`	iCalendar format	`text/calendar`
`.jar`	Java Archive (JAR)	`application/java-archive`
`.jpeg`
`.jpg`	JPEG images	`image/jpeg`
`.js`	JavaScript	`text/javascript`
`.json`	JSON format	`application/json`
`.jsonld`	JSON-LD format	`application/ld+json`
`.mid`
`.midi`	Musical Instrument Digital Interface (MIDI)	`audio/midi` `audio/x-midi`
`.mjs`	JavaScript module	`text/javascript`
`.mp3`	MP3 audio	`audio/mpeg`
`.mpeg`	MPEG Video	`video/mpeg`
`.mpkg`	Apple Installer Package	`application/vnd.apple.installer+xml`
`.odp`	OpenDocument presentation document	`application/vnd.oasis.opendocument.presentation`
`.ods`	OpenDocument spreadsheet document	`application/vnd.oasis.opendocument.spreadsheet`
`.odt`	OpenDocument text document	`application/vnd.oasis.opendocument.text`
`.oga`	OGG audio	`audio/ogg`
`.ogv`	OGG video	`video/ogg`
`.ogx`	OGG	`application/ogg`
`.otf`	OpenType font	`font/otf`
`.png`	Portable Network Graphics	`image/png`
`.pdf`	Adobe Portable Document Format (PDF)	`application/pdf`
`.ppt`	Microsoft PowerPoint	`application/vnd.ms-powerpoint`
`.pptx`	Microsoft PowerPoint (OpenXML)	`application/vnd.openxmlformats-officedocument.presentationml.presentation`
`.rar`	RAR archive	`application/x-rar-compressed`
`.rtf`	Rich Text Format (RTF)	`application/rtf`
`.sh`	Bourne shell script	`application/x-sh`
`.svg`	Scalable Vector Graphics (SVG)	`image/svg+xml`
`.swf`	Small web format (SWF) or Adobe Flash document	`application/x-shockwave-flash`
`.tar`	Tape Archive (TAR)	`application/x-tar`
`.tif
.tiff`	Tagged Image File Format (TIFF)	`image/tiff`
`.ttf`	TrueType Font	`font/ttf`
`.txt`	Text, (generally ASCII or ISO 8859-n)	`text/plain`
`.vsd`	Microsoft Visio	`application/vnd.visio`
`.wav`	Waveform Audio Format	`audio/wav`
`.weba`	WEBM audio	`audio/webm`
`.webm`	WEBM video	`video/webm`
`.webp`	WEBP image	`image/webp`
`.woff`	Web Open Font Format (WOFF)	`font/woff`
`.woff2`	Web Open Font Format (WOFF)	`font/woff2`
`.xhtml`	XHTML	`application/xhtml+xml`
`.xls`	Microsoft Excel	`application/vnd.ms-excel`
`.xlsx`	Microsoft Excel (OpenXML)	`application/vnd.openxmlformats-officedocument.spreadsheetml.sheet`
`.xml`	`XML`	`application/xml` 代码对普通用户来说不可读 (RFC 3023, section 3)
`text/xml` 代码对普通用户来说可读 (RFC 3023, section 3)
`.xul`	XUL	`application/vnd.mozilla.xul+xml`
`.zip`	ZIP archive	`application/zip`
`.3gp`	3GPP audio/video container	`video/3gpp`
`audio/3gpp`（若不含视频）
`.3g2`	3GPP2 audio/video container	`video/3gpp2`
`audio/3gpp2`（若不含视频）
`.7z`	7-zip archive	`application/x-7z-compressed`

android: 通过Intent筛选多种类型文件

android: 通过Intent筛选多种类型文件

MimeType文件

MimeType 文件列表参考

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