Android中调用系统所装的软件打开文件

在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：

Java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);

}

/**

* 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"},

{"", "*/*"}

};

这个MIME类型可能不够完整，你有要补充的吗？