//根据文件后缀名匹配MIMEType

public static String getMIMEType(File file) {

    String type = "*/*";

    String name = file.getName();

    int index = name.lastIndexOf('.');

    if (index < 0) {

        return type;

    }

    String end = name.substring(index, name.length()).toLowerCase();

    if (TextUtils.isEmpty(end)) return type;

    for (int i = 0; i < MIME_MapTable.length; i++) {

        if (end.equals(MIME_MapTable[i][0]))

            type = MIME_MapTable[i][1];

    }

    return type;

}

private static final String[][] MIME_MapTable = {

{".3gp", "video/3gpp"},        {".apk", "application/vnd.android.package-archive"},        {".asf", "video/x-ms-asf"},        {".avi", "video/x-msvideo"},        {".bin", "application/octet-stream"},        {".bmp", "image/bmp"},        {".c", "text/plain"},        {".class", "application/octet-stream"},        {".conf", "text/plain"},        {".cpp", "text/plain"},        {".doc", "application/msword"},        {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},        {".xls", "application/vnd.ms-excel"},        {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},        {".exe", "application/octet-stream"},        {".gif", "image/gif"},        {".gtar", "application/x-gtar"},        {".gz", "application/x-gzip"},        {".h", "text/plain"},        {".htm", "text/html"},        {".html", "text/html"},        {".jar", "application/java-archive"},        {".java", "text/plain"},        {".jpeg", "image/jpeg"},        {".jpg", "image/jpeg"},        {".js", "application/x-javascript"},        {".log", "text/plain"},        {".m3u", "audio/x-mpegurl"},        {".m4a", "audio/mp4a-latm"},        {".m4b", "audio/mp4a-latm"},        {".m4p", "audio/mp4a-latm"},        {".m4u", "video/vnd.mpegurl"},        {".m4v", "video/x-m4v"},        {".mov", "video/quicktime"},        {".mp2", "audio/x-mpeg"},        {".mp3", "audio/x-mpeg"},        {".mp4", "video/mp4"},        {".mpc", "application/vnd.mpohun.certificate"},        {".mpe", "video/mpeg"},        {".mpeg", "video/mpeg"},        {".mpg", "video/mpeg"},        {".mpg4", "video/mp4"},        {".mpga", "audio/mpeg"},        {".msg", "application/vnd.ms-outlook"},        {".ogg", "audio/ogg"},        {".pdf", "application/pdf"},        {".png", "image/png"},        {".pps", "application/vnd.ms-powerpoint"},        {".ppt", "application/vnd.ms-powerpoint"},        {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},        {".prop", "text/plain"},        {".rc", "text/plain"},        {".rmvb", "audio/x-pn-realaudio"},        {".rtf", "application/rtf"},        {".sh", "text/plain"},        {".tar", "application/x-tar"},        {".tgz", "application/x-compressed"},        {".txt", "text/plain"},        {".wav", "audio/x-wav"},        {".wma", "audio/x-ms-wma"},        {".wmv", "audio/x-ms-wmv"},        {".wps", "application/vnd.ms-works"},        {".xml", "text/plain"},        {".z", "application/x-compress"},        {".zip", "application/x-zip-compressed"},        {"", "*/*"}