概述
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;
}
}
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