这周我就写写如何在android上打开各种文件的方法（前提：你安装了相应文件的阅读器，eg：pdf）
step1：我们将文件的后缀和相应的datatype存入hashmap中，例如：
HashMap<String , String> mTypeMap = new HashMap<String, String>();
mTypeMap.put("pdf", "application/pdf");
mTypeMap.put("rar", "application/rar");
mTypeMap.put("doc", "application/msword");
mTypeMap.put("mp3", "audio/mpeg");
step2：根据文件名获取文件后缀：eg. pdf
step3：根据后缀名获取datatype：eg. pdf ---------->application/pdf，假设其方法名为：getMineType(String name)
step4：new Intent，并将文件的路径传递给准备跳转的activity：
String action = "android.intent.action.VIEW";
Intent intent = new Intent();
intent.setAction(action);
intent.setDataAndType(uri, getMineType("pdf"));
startActivity(intent);
注：以下是一些后缀对应的datatype，可以参考参考：
"application/ogg", "ogg"
"application/pdf", "pdf"
"application/rar", "rar"
"application/rdf+xml", "rdf"
"application/rss+xml", "rss"
"application/zip", "zip"
"application/vnd.android.package-archive", "apk"
"application/vnd.oasis.opendocument.database", "odb"
"application/vnd.oasis.opendocument.formula", "odf"
"application/vnd.oasis.opendocument.graphics", "odg"
"application/vnd.oasis.opendocument.spreadsheet", "ods"
"application/vnd.oasis.opendocument.spreadsheet-template","ots"
"application/vnd.oasis.opendocument.text", "odt"
"application/vnd.oasis.opendocument.text-master", "odm"
"application/msword", "doc"
"application/msword", "dot"
"application/vnd.openxmlformats-officedocument.wordprocessingml.document","docx"
"application/vnd.ms-excel", "xls"
"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet","xlsx"
"application/vnd.ms-powerpoint", "ppt"
"application/vnd.openxmlformats-officedocument.presentationml.presentation","pptx");
"application/vnd.visio", "vsd"
"audio/3gpp", "3gpp"
"audio/mpeg", "mp3"
"audio/x-ms-wma", "wma"
"audio/x-pn-realaudio", "rm"
"image/bmp", "bmp"
"image/gif", "gif"
"image/ico", "cur"
"image/ico", "ico"
"image/x-ms-bmp", "bmp"
"text/css", "css"
"text/html", "htm"
"text/html", "html"
"text/plain", "txt"
"text/plain", "text"
"text/xml", "xml"
"text/x-c++src", "c++"
"text/x-c++src", "cpp"
"text/x-component", "htc"
"text/x-csh", "csh"
"text/x-csrc", "c"
"text/x-dsrc", "d"
"text/x-haskell", "hs"
"text/x-java", "java"
"text/x-literate-haskell", "lhs"
"text/x-moc", "moc"
"text/x-pascal", "p"
"text/x-pascal", "pas"
"text/x-pcs-gcd", "gcd"
"text/x-setext", "etx"
"text/x-tcl", "tcl"
"text/x-tex", "tex"
"text/x-tex", "ltx"
"text/x-tex", "sty"
"text/x-tex", "cls"
"text/x-vcalendar", "vcs");
"text/x-vcard", "vcf");
"video/3gpp", "3gpp"
"video/3gpp", "3gp"
"video/3gpp", "3g2"
"video/dl", "dl"
"video/dv", "dif"
"video/dv", "dv"
"video/fli", "fli"
"video/m4v", "m4v"
"video/mpeg", "mpeg"
"video/mpeg", "mpg"
"video/mpeg", "mpe"
"video/mp4", "mp4"
"video/mpeg", "vob"
"video/quicktime", "qt"
"video/quicktime", "mov"
"video/vnd.mpegurl", "mxu"
"video/x-la-asf", "lsf"
"video/x-la-asf", "lsx"
"video/x-mng", "mng"
"video/x-ms-asf", "asf"
"video/x-ms-asf", "asx"
"video/x-ms-wm", "wm"
"video/x-ms-wmv", "wmv"
"video/x-ms-wmx", "wmx"
"video/x-ms-wvx", "wvx"
"video/x-msvideo", "avi"
"video/x-sgi-movie", "movie"
"x-conference/x-cooltalk", "ice"
"x-epoc/x-sisx-app", "sisx"
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