android浏览SD卡目录文件,实现音频播放

项目要求只需要实现音频播放, 如果有视频播发,可以重载isVideoFileType,isImageFileType, 详情看isAudioFileType的重载事例

 

下面的是一个工具类:

 

public class MediaFile {
// comma separated list of all file extensions supported by the media scanner
public static String sFileExtensions;

// Audio file types
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 file types
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 file types
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 file types
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 file types
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;

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());
}
//重载方法，根据文件路径识别音频文件
public static boolean isAudioFileType(String path) {
MediaFileType type = getFileType(path);
if(null != type) {
return isAudioFileType(type.fileType);
}
return false;
}

public static int getFileTypeForMimeType(String mimeType) {
Integer value = sMimeTypeMap.get(mimeType);
return (value == null ? 0 : value.intValue());
}
}

源码下载地址:http://download.csdn.net/detail/ygswine/6411983

 

 

运行图片链接: