最近测试人员发现用原生浏览器下载的apk点击安装时无反应，不能安装。

在/vendor/mediatek/proprietary/packages/apps/Browser/src/com/android/browser/DownloadHandler.java

中，发现下载的apk文件缺少了mime类型，如下图

 mimetype = null造成；

修改：

        if (filename.endsWith(".apk")) {

                    mimetype = "application/vnd.android.package-archive";

        }

根据文件名添加mimetype = "application/vnd.android.package-archive"就可以了。

附加一个文件后缀名与mime类型对应表：

{".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"},

{"", "*/*"}