调用已经安装的APP来打开自己应用中的文件

来源：互联网发布：python return 返回值编辑：程序博客网时间：2024/06/08 06:54

应用中如何调用系统所装的软件打开一个文件，这是我们经常碰到的问题，下面是我所用到的一种方法，和大家一起分享一下！

这个是打开文件的一个方法：

/**  * 打开文件  * @param file  */  private void openFile(File file){            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      startActivity(intent);          }    /**  * 根据文件后缀名获得对应的MIME类型。  * @param file  */  private 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;  }

MIME_MapTable是所有文件的后缀名所对应的MIME类型的一个String数组：

<span style="white-space: pre;">    </span>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"},              {".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"},              {"",        "*/*"}            };

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