Android 判斷檔案的類型

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import java.util.HashMap;import java.util.Iterator;/** * 判斷檔案的類型 */public class MediaFileUtil {    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;    //靜態內部類    static class MediaFileType {        int fileType;        String mimeType;        MediaFileType(int fileType, String mimeType) {            this.fileType = fileType;            this.mimeType = mimeType;        }    }    private static HashMap<String, MediaFileType> sFileTypeMap            = new HashMap<String, MediaFileType>();    private static HashMap<String, Integer> sMimeTypeMap            = new HashMap<String, Integer>();    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 final String UNKNOWN_STRING = "<unknown>";    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());    }    //根據視頻檔案路徑判斷檔案類型    public static boolean isVideoFileType(String path) {          MediaFileType type = getFileType(path);        if(null != type) {            return isVideoFileType(type.fileType);        }        return false;    }    //根據音頻檔案路徑判斷檔案類型    public static boolean isAudioFileType(String path) {          MediaFileType type = getFileType(path);        if(null != type) {            return isAudioFileType(type.fileType);        }        return false;    }    //根據mime類型查看檔案類型    public static int getFileTypeForMimeType(String mimeType) {        Integer value = sMimeTypeMap.get(mimeType);        return (value == null ? 0 : value.intValue());    }    //根據圖片檔案路徑判斷檔案類型    public static boolean isImageFileType(String path) {          MediaFileType type = getFileType(path);        if(null != type) {            return isImageFileType(type.fileType);        }        return false;    }}

　　

Android 判斷檔案的類型