/*** 根據文件類型打開 ****/
    public static void openFile(Context context, File file) {

        // 跳轉
        try {
            Intent intent = new Intent();
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            // 設置intent的Action屬性
            intent.setAction(Intent.ACTION_VIEW);
            // 獲取文件file的MIME類型
            String type = getMIMEType(file);
            // 設置intent的data和Type屬性。
            intent.setDataAndType(Uri.fromFile(file), type);
            context.startActivity(intent);
        } catch (Exception e) {
            Toast.makeText(context, "找不到打開此文件的應用！", Toast.LENGTH_SHORT).show();
        }
    }

    /*** 根據文件后綴回去MIME類型 ****/
    private static String getMIMEType(File file) {
        try {
            String type = "*/*";
            String fName = file.getName();
            // 獲取后綴名前的分隔符"."在fName中的位置。
            int dotIndex = fName.lastIndexOf(".");
            if (dotIndex < 0) {
                return type;
            }
            /* 獲取文件的后綴名 */
            String end = fName.substring(dotIndex, fName.length())
                    .toLowerCase();
            if (end == "")
                return type;
            // 在MIME和文件類型的匹配表中找到對應的MIME類型。
            for (int i = 0; i < MIME_MapTable.length; i++) { // MIME_MapTable??在這里你一定有疑問，這個MIME_MapTable是什么？
                if (end.equals(MIME_MapTable[i][0]))
                    type = MIME_MapTable[i][1];
            }
            return type;
        } catch (Exception e) {
            return null;
        }
    }

    private static final String[][] MIME_MapTable = {
            // {后綴名，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" },
            { ".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" }, { "", "*/*" } };
}