原文:http://blog.csdn.net/bigapple88/article/details/6555868
背景介紹:
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定,在1992年最早應用于電子郵件系統,但後來也應用到浏覽器。mime類型就是設定某種擴充名的檔案用一種應用程式來打開的方式類型,當該擴充名檔案被通路的時候,浏覽器會自動使用指定應用程式來打開。多用于指定一些用戶端自定義的檔案名,以及一些媒體檔案打開方式。
在android中通過檔案的mime類型來判斷有哪些應用程式可以處理這些檔案,并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資料總管(檔案浏覽器)的時候,希望能在資料總管的中實作打開檔案的操作,此時就需要用到檔案的mime類型。
實作方法:
/**
* 根據檔案字尾名獲得對應的mime類型。
* @param file
*/
private string getmimetype(file file)
{
string type="*/*";
string fname=file.getname();
//擷取字尾名前的分隔符"."在fname中的位置。
int dotindex = fname.lastindexof(".");
if(dotindex < 0){
return type;
}
/* 擷取檔案的字尾名 */
string end=fname.substring(dotindex,fname.length()).tolowercase();
if(end=="")return type;
//在mime和檔案類型的比對表中找到對應的mime類型。
for(int i=0;i< p>
if(end.equals(mime_maptable[i][0]))
type = mime_maptable[i][1];
* 打開檔案
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);
//擷取檔案file的mime類型
string type = getmimetype(file);
//設定intent的data和type屬性。
intent.setdataandtype(/*uri*/uri.fromfile(file), type);
//跳轉
startactivity(intent);
現在就差一個mime類型和檔案類型的比對表了。
------------------------------- 我是背景分割線 ------------------------------------------
"檔案類型——mime類型"的比對表:
//建立一個mime類型與檔案字尾名的比對表
private final string[][] mime_maptable={
//{字尾名, mime類型}
{".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"},
{"", "*/*"}
};