import java.io.File;

 import android.content.Context;

 import android.content.Intent;

 import android.net.Uri;

 public class OpenFileUtil {

     public static 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" },

             { ".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" }, { "", "*/*" } };

     /**

      * 打开文件

      *

      * @param file

      */

     public static void openFile(File file, Context context) {

         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 */Uri.fromFile(file), type);

         // 跳转

         context.startActivity(intent);

     }

     /**

      * @param file

      * @return 获得文件后缀名

      */

     private static String getMIMEType(File file) {

         String type = "*/*";

         String fName = file.getName();

         // 获取后缀名前的分隔符"."在fName中的位置。

         int dotIndex = fName.lastIndexOf(".");

         if (dotIndex < 0) {

             return type;

         }

         /* 获取文件的后缀名 */

         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++) { // MIME_MapTable??在这里你一定有疑问，这个MIME_MapTable是什么？

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

                 type = MIME_MapTable[i][1];

         }

         return type;

     }

 }