Android 获取文件后缀名

MIME TYPE描述

内容类型(Content-Type),这个头部领域用于指定消息的类型。一般以下面的形式出现。[type]/[subtype]

type有下面的形式。

Text:用于标准化地表示的文本信息,文本消息可以是多种字符集和或者多种格式的;
Multipart:用于连接消息体的多个部分构成一个消息,这些部分可以是不同类型的数据;
Application:用于传输应用程序数据或者二进制数据;
Message:用于包装一个E-mail消息;
Image:用于传输静态图片数据;
Audio:用于传输音频或者音声数据;
Video:用于传输动态影像数据,可以是与音频编辑在一起的视频数据格式。

常用的subtype值如下所示: 

text/plain(纯文本)
text/html(HTML文档)
application/xhtml+xml(XHTML文档)
image/gif(GIF图像)
image/jpeg(JPEG图像)【PHP中为:image/pjpeg】
image/png(PNG图像)【PHP中为:image/x-png】
video/mpeg(MPEG动画)
application/octet-stream(任意的二进制数据)
application/pdf(PDF文档)
application/msword(Microsoft Word文件)
message/rfc822(RFC 822形式)
multipart/alternative(HTML邮件的HTML形式和纯文本形式,相同内容使用不同形式表示)
application/x-www-form-urlencoded(使用HTTP的POST方法提交的表单)
multipart/form-data(同上,但主要用于表单提交时伴随文件上传的场合)

获取mine type 


    public static String getContentType(String filename){
        String type = null;
        Path path = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            path = Paths.get(filename);
            try {
                type = Files.probeContentType(path);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return type;
    }

 

 查找文件是什么类型

public class MediaFileUtil {
    //删除地址参数,以免判断类型是判断失误
    public static String removeParams(String url) {
        return url.replaceAll("\\?.*", "");
    }
    private static HashMap<String, MediaFileType> sFileTypeMap = new HashMap<String, MediaFileType>();
    private static HashMap<String, Integer> sMimeTypeMap = new HashMap<String, Integer>();

    public static String sFileExtensions;
    // Audio
    public static final int FILE_TYPE_MP3 = 1;
    public static final int FILE_TYPE_M4A = 2;
    public static final int FILE_TYPE_WAV = 3;
    public static final int FILE_TYPE_AMR = 4;
    public static final int FILE_TYPE_AWB = 5;
    public static final int FILE_TYPE_WMA = 6;
    public static final int FILE_TYPE_OGG = 7;
    private static final int FIRST_AUDIO_FILE_TYPE = FILE_TYPE_MP3;
    private static final int LAST_AUDIO_FILE_TYPE = FILE_TYPE_OGG;
    // MIDI
    public static final int FILE_TYPE_MID = 11;
    public static final int FILE_TYPE_SMF = 12;
    public static final int FILE_TYPE_IMY = 13;
    private static final int FIRST_MIDI_FILE_TYPE = FILE_TYPE_MID;
    private static final int LAST_MIDI_FILE_TYPE = FILE_TYPE_IMY;

    // Video
    public static final int FILE_TYPE_MP4 = 21;
    public static final int FILE_TYPE_M4V = 22;
    public static final int FILE_TYPE_3GPP = 23;
    public static final int FILE_TYPE_3GPP2 = 24;
    public static final int FILE_TYPE_WMV = 25;
    private static final int FIRST_VIDEO_FILE_TYPE = FILE_TYPE_MP4;
    private static final int LAST_VIDEO_FILE_TYPE = FILE_TYPE_WMV;
    // Image
    public static final int FILE_TYPE_JPEG = 31;
    public static final int FILE_TYPE_GIF = 32;
    public static final int FILE_TYPE_PNG = 33;
    public static final int FILE_TYPE_BMP = 34;
    public static final int FILE_TYPE_WBMP = 35;
    private static final int FIRST_IMAGE_FILE_TYPE = FILE_TYPE_JPEG;
    private static final int LAST_IMAGE_FILE_TYPE = FILE_TYPE_WBMP;
    // Playlist
    public static final int FILE_TYPE_M3U = 41;
    public static final int FILE_TYPE_PLS = 42;
    public static final int FILE_TYPE_WPL = 43;
    private static final int FIRST_PLAYLIST_FILE_TYPE = FILE_TYPE_M3U;
    private static final int LAST_PLAYLIST_FILE_TYPE = FILE_TYPE_WPL;

    //静态内部类
    static class MediaFileType {
        int fileType;
        String mimeType;

        MediaFileType(int fileType, String mimeType) {
            this.fileType = fileType;
            this.mimeType = mimeType;
        }
    }

    static void addFileType(String extension, int fileType, String mimeType) {
        sFileTypeMap.put(extension, new MediaFileType(fileType, mimeType));
        sMimeTypeMap.put(mimeType, new Integer(fileType));
    }

    static {
        addFileType("MP3", FILE_TYPE_MP3, "audio/mpeg");
        addFileType("M4A", FILE_TYPE_M4A, "audio/mp4");
        addFileType("WAV", FILE_TYPE_WAV, "audio/x-wav");
        addFileType("AMR", FILE_TYPE_AMR, "audio/amr");
        addFileType("AWB", FILE_TYPE_AWB, "audio/amr-wb");
        addFileType("WMA", FILE_TYPE_WMA, "audio/x-ms-wma");
        addFileType("OGG", FILE_TYPE_OGG, "application/ogg");
        addFileType("MID", FILE_TYPE_MID, "audio/midi");
        addFileType("XMF", FILE_TYPE_MID, "audio/midi");
        addFileType("RTTTL", FILE_TYPE_MID, "audio/midi");
        addFileType("SMF", FILE_TYPE_SMF, "audio/sp-midi");
        addFileType("IMY", FILE_TYPE_IMY, "audio/imelody");
        addFileType("MP4", FILE_TYPE_MP4, "video/mp4");
        addFileType("M4V", FILE_TYPE_M4V, "video/mp4");
        addFileType("3GP", FILE_TYPE_3GPP, "video/3gpp");
        addFileType("3GPP", FILE_TYPE_3GPP, "video/3gpp");
        addFileType("3G2", FILE_TYPE_3GPP2, "video/3gpp2");
        addFileType("3GPP2", FILE_TYPE_3GPP2, "video/3gpp2");
        addFileType("WMV", FILE_TYPE_WMV, "video/x-ms-wmv");
        addFileType("JPG", FILE_TYPE_JPEG, "image/jpeg");
        addFileType("JPEG", FILE_TYPE_JPEG, "image/jpeg");
        addFileType("GIF", FILE_TYPE_GIF, "image/gif");
        addFileType("PNG", FILE_TYPE_PNG, "image/png");
        addFileType("BMP", FILE_TYPE_BMP, "image/x-ms-bmp");
        addFileType("WBMP", FILE_TYPE_WBMP, "image/vnd.wap.wbmp");
        addFileType("M3U", FILE_TYPE_M3U, "audio/x-mpegurl");
        addFileType("PLS", FILE_TYPE_PLS, "audio/x-scpls");
        addFileType("WPL", FILE_TYPE_WPL, "application/vnd.ms-wpl");

        // compute file extensions list for native Media Scanner
        StringBuilder builder = new StringBuilder();
        Iterator<String> iterator = sFileTypeMap.keySet().iterator();
        while (iterator.hasNext()) {
            if (builder.length() > 0) {
                builder.append(',');
            }
            builder.append(iterator.next());
        }
        sFileExtensions = builder.toString();
    }

    public static boolean isAudioFileType(int fileType) {
        return ((fileType >= FIRST_AUDIO_FILE_TYPE &&
                fileType <= LAST_AUDIO_FILE_TYPE) ||
                (fileType >= FIRST_MIDI_FILE_TYPE &&
                        fileType <= LAST_MIDI_FILE_TYPE));
    }

    public static boolean isVideoFileType(int fileType) {
        return (fileType >= FIRST_VIDEO_FILE_TYPE &&
                fileType <= LAST_VIDEO_FILE_TYPE);
    }

    public static boolean isImageFileType(int fileType) {
        return (fileType >= FIRST_IMAGE_FILE_TYPE &&
                fileType <= LAST_IMAGE_FILE_TYPE);

    }

    public static boolean isPlayListFileType(int fileType) {
        return (fileType >= FIRST_PLAYLIST_FILE_TYPE &&
                fileType <= LAST_PLAYLIST_FILE_TYPE);
    }

    public static MediaFileType getFileType(String path) {
        int lastDot = path.lastIndexOf(".");
        if (lastDot < 0)
            return null;
        return sFileTypeMap.get(path.substring(lastDot + 1).toUpperCase());
    }

    //根据视频文件路径判断文件类型
    public static boolean isVideoFileType(String path) {
        MediaFileType type = getFileType(path);
        if (null != type) {
            return isVideoFileType(type.fileType);
        }
        return false;
    }

    //根据音频文件路径判断文件类型
    public static boolean isAudioFileType(String path) {
        MediaFileType type = getFileType(path);
        if (null != type) {
            return isAudioFileType(type.fileType);
        }
        return false;
    }

    //根据mime类型查看文件类型
    public static int getFileTypeForMimeType(String mimeType) {
        Integer value = sMimeTypeMap.get(mimeType);
        return (value == null ? 0 : value.intValue());
    }


    //根据图片文件路径判断文件类型
    public static boolean isImageFileType(String path) {
        MediaFileType type = getFileType(path);
        if (null != type) {
            return isImageFileType(type.fileType);
        }
        return false;
    }
}

 

    原文作者:bobob_
    原文地址: https://blog.csdn.net/dubo_csdn/article/details/89228514
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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