apk安装法之三--"application/vnd.android.package-archive"是什么？

转载自：http://blog.csdn.net/heikefangxian23/article/details/38582261

apk安装法之三--"application/vnd.android.package-archive"是什么？

在第二篇中讲明了调用

 Intent i = new Intent(Intent.ACTION_VIEW);
         i.setDataAndType(Uri.parse("file://" + apkfile.toString()), "application/vnd.android.package-archive");
         mContext.startActivity(i);

可以自动安装一个apk应用。

但这里

 "application/vnd.android.package-archive"究竟是什么呢？

 "code" class="java">具体看下面这段代码

 "code" class="java">/**
  * 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);   //这里的action——view之功用5下一篇博客
     //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??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;
 }







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

 Java代码

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

由上可见，

 "application/vnd.android.package-archive"是文件类型，具体对应apk类型。

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