MIME：全稱Multipurpose Internet Mail Extensions，多功能Internet 郵件擴充服務。它是一種多用途網際郵件擴充協議，在1992年最早應用於電子郵件系統，但後來也應用到瀏覽器。MIME型別就是設定某種副檔名的檔案用一種應用程式來開啟的方式型別，當該副檔名檔案被訪問的時候，瀏覽器會自動使用指定應用程式來開啟。多用於指定一些客戶端自定義的檔名，以及一些媒體檔案開啟方式。

在Android中通過檔案的MIME型別來判斷有哪些應用程式可以處理這些檔案，並使用其中的某一個應用程式（如果有多個可選的應用程式，則使用者必須指定一個）處理之。

我在寫android資源管理器（檔案瀏覽器）的時候，希望能在資源管理器的中實現開啟檔案的操作，此時就需要用到檔案的MIME型別。

實現方法：

 private String getMIMEType(File file)

 {

 String type="* 

 String end=fName.substring(dotIndex,fName.length()).toLowerCase();

 if(end=="")return type;

 //在MIME和檔案型別的匹配表中找到對應的MIME型別。 

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

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

 type = MIME_MapTable[i][1];

 }

 return type;

 }

 private void openFile(File file){

 //Uri uri = Uri.parse("file://"+file.getAbsolutePath()); 

 Intent intent = new Intent();

 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

 //設定intent的Action屬性 

 intent.setAction(Intent.ACTION_VIEW);

 //獲取檔案file的MIME型別 

 String type = getMIMEType(file);

 //設定intent的data和Type屬性。
 
 

 intent.setDataAndType(Uri.fromFile(file), type);

 //跳轉 

 startActivity(intent);

 }

 現在就差一個MIME型別和檔案型別的匹配表了。

------------------------------- 我是背景分割線 ------------------------------------------

"檔案型別——MIME型別"的匹配表: 

 //建立一個MIME型別與檔案字尾名的匹配表 

 private final String[][] MIME_MapTable={

 //{字尾名， MIME型別} 

 {".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"},

 {".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"},

 {".prop", "text/plain"},

 {".rar", "application/x-rar-compressed"},

 {".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/xml"}, 

 {".xml", "text/plain"},

 {".z", "application/x-compress"},

 {".zip", "application/zip"},

 {"", "*/*"}

 };

這個表目前還不全，上面的只是一些常用的檔案型別，對於其他的檔案型別和MIME的匹配值我會在以後更新。