Android 判断文件的类型

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import java.util.HashMap; import java.util.Iterator;   /**  * 判断文件的类型  */ 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;       //静态内部类     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;     } }