Android打开系统自带文件管理器，选择指定类型的文件

        //调用系统文件管理器打开指定路径目录
        Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
        //intent.setDataAndType(Uri.fromFile(dir.getParentFile()), "file/*.txt");
        //intent.setType("file/*.txt"); //华为手机mate7不支持
        intent.setType("text/plain");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent, 0);

a、指定文件路径

intent.setDataAndType(Uri.fromFile(dir.getParentFile()), "file/*.txt");

某些Android版本没有效果。

b、指定文件类型

intent.setType("file/*.txt"); //华为手机mate7不支持

c、常用文件类型格式

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 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"},

　　{"", "*/*"}

　　};

完！！！