Android 打开各种文件（setDataAndType）——apk安装方法

来源：互联网发布：教学状态数据分析报告编辑：程序博客网时间：2024/06/03 13:34

"application/vnd.android.package-archive"是什么？原来是apk安装方法

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

ava代码  /** * 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);     //这里最好try一下，有可能会报错。 //比如说你的MIME类型是打开邮箱，但是你手机里面没装邮箱客户端，就会报错。     }

/** * 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： Java代码  <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"},             {"",        "*/*"}           };

还有以下例子
1. Intent open a picture file public:

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  Uri uri = Uri.fromFile(new  File("/mnt/sdcard/images/001041580.jpg"));  intent.setDataAndType (uri, "image/*");  this.startActivity(intent);

2. Intent to open a PDF file:

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  Uri uri = Uri.fromFile(new  File("file:///android_asset/helphelp.pdf"));  intent.setDataAndType (uri, "application/pdf");  this.startActivity(intent);

3. Intent to open a text file:

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  if (paramBoolean)  {  Uri uri1 = Uri.parse (param);  intent.setDataAndType (URI1, "text/plain");  }  else  {  Uri uri = Uri.fromFile(new File("/mnt/sdcard/hello.txt"));  intent.setDataAndType (URI2, "text/plain");  }  this.startActivity(intent);

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