Android 判断文件的类型 _Android

少年意气强不羁，虎胁插翼白日飞。这篇文章主要讲述Android 判断文件的类型相关的知识，希望能为你提供帮助。

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 = https://www.songbingjia.com/android/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; } }

【Android 判断文件的类型】