android intent MIME type

MIME:全称Multipurpose Internet Mail Extensions,多功能Internet 邮件扩充服务。它是一种多用途网际邮件扩充协议,在1992年最早应用于电子邮件系统,但后来也应用到浏览器。MIME类型就是设定某种扩展名的文件用一种应用程序来打开的方式类型,当该扩展名文件被访问的时候,浏览器会自动使用指定应用程序来打开。多用于指定一些客户端自定义的文件名,以及一些媒体文件打开方式。

在Android中通过文件的MIME类型来判断有哪些应用程序可以处理这些文件,并使用其中的某一个应用程序(如果有多个可选的应用程序,则用户必须指定一个)处理之。

我在写android资源管理器(文件浏览器)的时候,希望能在资源管理器的中实现打开文件的操作,此时就需要用到文件的MIME类型。

实现方法:

   
 private String getMIMEType(File file)
 {
 String type="* 
 String end=fName.substring(dotIndex,fName.length()).toLowerCase();
 if(end=="")return type;
 //在MIME和文件类型的匹配表中找到对应的MIME类型。 
 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);
 //设置intent的Action属性 
 intent.setAction(Intent.ACTION_VIEW);
 //获取文件file的MIME类型 
 String type = getMIMEType(file);
 //设置intent的data和Type属性。 
 intent.setDataAndType(Uri.fromFile(file), type);//理解:这里MIME TYPE指示了什么样的应用程序展示文件
 //跳转 
 startActivity(intent);
 }


 现在就差一个MIME类型和文件类型的匹配表了。
 
------------------------------- 我是背景分割线 ------------------------------------------
  
"文件类型——MIME类型"的匹配表: 
 //建立一个MIME类型与文件后缀名的匹配表 
 private final String[][] MIME_MapTable={
 //{后缀名, MIME类型} 
 {".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"},
 {"", "*/*"}
 };
这个表目前还不全,上面的只是一些常用的文件类型,对于其他的文件类型和MIME的匹配值我会在以后更新。

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