主要内容:
①MimeType概述
②MimeType参数列表
③一段简易文件浏览器中调用第三方APK打开选中文件的代码
1.MimeType概述
先上一段代码
<intent-filter > <action android:name="android.intent.action.VIEW" /> <category android:name="android.intent.category.DEFAULT" /> <data android:mimeType="text/plain" /> </intent-filter>
如上代码中,Intent-Filter中的<data>有一个mimeType . 它的作用是告诉Android系统本Activity可以处理的文件的类型。如上面设置为 “text/plain”,表示本Activity可以打开处理“.txt”类型的文件。
2.摘录一段网上的相关介绍和参数介绍:
多用途互联网邮件扩展(MIME,Multipurpose Internet Mail Extensions)是一个互联网标准,它扩展了电子邮件标准,使其能够支持非ASCII字符、二进制格式附件等多种格式的邮件消息。
内容类型(Content-Type),这个头部领域用于指定消息的类型。一般以下面的形式出现。[type]/[subtype]
type有下面的形式:
subtype用于指定type的详细形式。content-type/subtype配对的集合和与此相关的参数,将随着时间而增长。为了确保这些值在一个有序而且公开的状态下开发,MIME使用Internet Assigned Numbers Authority (IANA)作为中心的注册机制来管理这些值。常用的subtype值如下所示:
import java.io.File; import android.content.ActivityNotFoundException; import android.content.Context; import android.content.Intent; import android.net.Uri; import android.widget.Toast; public class CallOtherOpenFile { public void openFile(Context context,File file){ try{ 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.fromFile(file), type); //跳转 context.startActivity(intent); }catch (ActivityNotFoundException e) { // TODO: handle exception Toast.makeText(context, "sorry附件不能打开,请下载相关软件!", 500).show(); } } 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++){ if(end.equals(MIME_MapTable[i][0])) type = MIME_MapTable[i][1]; } return type; } // 可以自己随意添加 删减 private 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"}, {"", "*/*"} }; }
CallOtherOpenFile call= new CallOtherOpenFile(); call.openFile(context, file);